259 results about "Gelisol" patented technology

The invention is a large multifunctional frozen soil-structure interface cyclic direct shear apparatus and a test operation method. The structure of the apparatus comprises a horizontal and vertical loading system, a horizontal and vertical displacement and a load sensor, a temperature control and refrigeration system, a temperature sensor, a data collecting and self-stabilizing system, a guide rail system, and a soil sample box and supports. The test operation method comprises the steps of: 1. Installing the interface steel of required roughness; 2. Applying normal boundary conditions to a soil sample; 3. Cooling the soil sample; and 4. When the temperature cools to a target temperature, performing a shearing to the frozen soil interface in a selected shearing speed, at the same time the date collecting system beginning to record the stress-strain relation of the frozen soil interface. The apparatus and the method are the advantageous in that: 1) accurate control of the interface temperature in the temperature range between 0 DEG C and -20 DGE C can be achieved; 2) three normal boundary conditions of constant stiffness, constant displacement and constant stress can be accurately applied; 3) interfaces of various roughness can be simulated; 4) two shear modes of cyclic shear and monotonic shear can be realized; and 5) the stress applying and displacement control are accurate.

The invention relates to a method and device for field observation of soil layer frost heaving of a high speed railway in a seasonal frozen soil region. An optical instrument used for observing seasonal frozen soil layer frost heaving amount cannot be used for observing the frost heaving amount of all layered soil in the freezing depth, precision is hard to meet, and professional instruments and observation technicians are needed for observation. The device is buried in a seasonal frozen soil layer and comprises a round-sheet-shaped lower anchor disc and a round-sheet-shaped upper anchor disc. A vertical measuring bar displacement meter is connected to the center of the lower anchor disc and the center of the upper anchor disc, and the measuring bar displacement meter is connected with a reading instrument arranged outside filled soil above the upper anchor disc through a transmission cable. Frost heaving deformation of the seasonal frozen soil layer drives the upper anchor disc and the lower anchor disc to move, and the measuring bar displacement meter is used for observing the variable quantity of the distance between the upper anchor disc and the lower anchor disc to reflect the frost heaving amount of the seasonal frozen soil layer. By means of the method and device, the total frost heaving amount of the seasonal frozen soil layer can be observed, and the frost heaving amount of all layered soil can be observed by setting devices of different lengths; the displacement meter is high in observation precision and efficiency, and automation of observation of frost heaving deformation can be achieved.

The invention, which belongs to the technical field of the electrical power engineering, particularly relates to a construction method of a resistance reduction and grounding device of a transformer station. The method comprises: a surveyor measures a soil resistivity, a frozen soil depth, and a soil layering situation in a site area of a transformer station to obtain surveying data; a soil model is established according to the surveying data; on the basis of the soil model, a grounding device inside the station is designed in the site area of the transformer station; safety verification is carried out on the grounding device designed at the last step so as to obtain a verification result; if the verification result meets the requirement, a next step is executed; if the verification result does not meet the requirement, a grounding device is arranged externally outside the site area of the transformer station and safety verification is carried out; the verification result is stored; a construction drawing is drawn; and construction is carried out by organizing people. Under the circumstances that no extra collected land is increased, the construction method of the resistance reduction and grounding device of the transformer station is provided. The construction method has characteristics of obvious resistance reduction effect, simple structure, convenient construction, and low cost and the like.

The invention provides a multi-parameter dynamic acquisition artificial ground freezing experimental device and method. The experimental device comprises a soil sample container, a data acquisition system, a hydraulic system and a freezing system. The soil sample container comprises an upper cover, a cylinder and a base plate. The data acquisition system comprises a data acquisition panel, a wateracquisition apparatus and a salt acquisition apparatus. The freezing system comprises a freezing machine, a liquid supply pipe, a liquid return pipe and a freezer. The freezing machine is used for generating and pumping low temperature or high temperature medium, which undergoes heat exchange with the soil sample in the freezer. The experimental device can achieve freezing or forced thawing of the artificial ground soil sample, and can dynamically acquire the soil sample moisture, salinity, temperature, displacement and other parameters in the freezing process. The experimental device can simulate the test environment of offshore saline ground freezing and be used for studying the freezing law of saline frozen soil, and provides a reference for offshore saline ground freezing scheme design and construction.

The invention provides a multifunctional geotechnical model testing system and method and relates to a geotechnical model testing system and method, aiming at solving the problem that an existing model box cannot simulate conditions of a temperature field. The multifunctional geotechnical model testing system comprises an outer framework, the model box, a rainfall simulation mechanism, a refrigerating mechanism, a heating mechanism and a data acquisition system, wherein the model box is mounted on the outer framework; a water outlet of the rainfall simulation mechanism is arranged at the top of the model box; the refrigerating mechanism and the heating mechanism can provide environment temperature to the model box; the data acquisition system is used for acquiring frozen soil working condition indexes in the model box. The method comprises the following steps: 1, determining the size and the model similarity ratio of the model box and the length and the slope ratio of a roadbed model;2, preparing a soil body material for simulation; 3, establishing a corresponding simulation procedure; 4, acquiring and displaying data. The multifunctional geotechnical model testing system and method are used for a frozen soil test.

A method for conducting active thermal protection on a tunnel shallow buried section in a permafrost region using a hot bar cluster comprises the following steps: collecting meteorological data in a tunnel site area; combining construction geological exploration data to ascertain the basic thermophysical parameters, permafrost types, superior limit depth, ground temperature annual mean changing depth and annual mean changing depth of the surrounding rocks in the tunnel shallow buried section; determining the burying range and the burying depth of the hot bar cluster, arranging the hot bars in an equilateral triangle mode, and determining the length of the hot bars according to the burying depth; and burying the hot bars by means of drilling insertion method, promoting the refreezing of the surrounding rocks in the hot-melt circle of the tunnel shallow buried section and the rapid forming of frozen earth seepage-proofing curtain in the tunnel surrounding rocks by means of the 'active' temperature-reduction property, that the hot bars can actively extract heat in the surrounding rocks out and send the heat into the atmosphere, of the hot bars, and conducting the thermal protection on the tunnel shallow buried section structure. The method for conducting the active thermal protection on the tunnel shallow buried section in the permafrost region using the hot bar cluster can accelerate the refreezing of the surrounding rocks in the hot-melt circle of the tunnel shallow buried section, shorten the freeze thawing circulation period and resolve the problems that the refreezing cycle of the surrounding rocks in the tunnel shallow buried section is long, a waterproof and drainage system is prone to becoming invalid and a freeze-thaw damage occurs in a supporting structure.

The invention belongs to the field of underground engineering, and particularly relates to a determination test device for freezing force of the contact surface between an underground structure in a natural frozen soil area and a manual frozen soil reinforcing area and frozen soil and a determination method of the freezing force determination test device. A soil sample is pressed by a hydraulic soil sample presser to be uniform in compactness, hollow layers of a three-layer organic glass constant temperature preservation cover are filled with refrigerants and foaming materials to achieve constant temperature preservation for frozen soil, right-angle pits with different depths are horizontally and annularly turned in the outer wall of a steel pipe model pile to simulate structures with different roughness degrees, thermocouple temperature sensors are embedded at different height and different direction positions on the side wall of the steel pipe model pile to accurately determine the pile and soil contact surface temperature, and the thermocouple temperature sensors, a pressure sensor and a vertical displacement sensor are connected with a digital collection instrument to synchronously determine the pile-soil contact surface temperature, the pile top vertical load and pile-soil relative displacement changes. The freezing force determination test device is simple in structure, stable and reliable in performance, wide in application range, and capable of accurately determining the freezing force and freezing strength between frozen soil at different temperatures and the structures with different roughness degrees.

The invention relates to the field of tunnel portal side slopes, in particular to a structure capable of avoiding cold damage to a high-temperature and unstable freeze soil area tunnel portal side slope. The structure comprises a side slope rock and earth mass, a rubble stone layer and a side slope retaining structure. Ventilation pipelines are distributed in the rubble stone layer at equal intervals. The wall of each ventilation pipeline is provided with ventilation holes. The upper end of each ventilation pipeline faces the cold air direction of the cold season. The upper end and the lower end of each ventilation pipeline are respectively provided with a horizontal cross slope. The lower end of each ventilation pipeline is connected with a longitudinal drainage ditch. The upper port and the lower port of each ventilation pipeline are respectively provided with a wind stop cover. Square ventilation ports corresponding to the ventilation pipelines in portion are distributed at the bottom of the side slope retaining structure. The rest of the side slope retaining structure is embedded into the ground surface. By the utilization of the characteristics of natural convection circulation of cold air in the rubble stone layer and rapid ventilation and cooling in the ventilation pipelines with the ventilation holes, the high-temperature and unstable freeze soil area tunnel portal side slope is automatically cooled, the temperature of the side slope is reduced, the upper limit of freeze soil is increased, cold reserves of a stratum are increased, and the problem of cold damage to the retaining structure of the high-temperature and unstable freeze soil area tunnel portal side slope is solved.

The invention discloses an uplift pile with an upper straight rod and a lower screw suitable for seasonal frozen soil regions and a construction method thereof. The uplift pile is characterized by comprising a plurality of anti-punching shear bars, a sand pulp and a sleeve pipe, wherein the anti-punching shear bars are positioned at the central position of the uplift pile; the anti-punching shear bars are wrapped with the sand pulp to form a cylindrical structure; a connector protruding out of the top of each of the uplift pile is reserved at the top of each of the anti-punching shear bars; a thread is arranged on the outer wall of the lower part of the cylindrical structure to form the screw part of the uplift pile; no thread is formed on the outer wall at the upper part of the cylindrical structure so as to form the straight rod part of the uplift pile; the outer wall of the straight rod part of the uplift pile is sleeved with the sleeve pipe; the sleeve pipe comprises an inner layer sleeve pipe and an outer layer sleeve pipe; the outer layer sleeve pipe can produce displacement relative to the inner layer sleeve pipe in the axial direction of the uplift pile; the inner wall of the inner layer sleeve pipe is in contact with the sand pulp; and the outer wall of the outer layer sleeve pipe is in contact with the frost-heaving and thawing-settlement foundation.

The invention discloses a permafrost region buried pipeline thaw collapse control method and device with combination of hot sticks and coarse-grained soil and relates to the technical field of pipeline systems. The permafrost region buried pipeline thaw collapse control method is characterized in that silty clay with strong thaw collapse property around a buried pipeline (1) is replaced by the coarse-grained soil with weak thaw collapse frost heaving property, namely, a layer of pebbles (4) without sharp corner angles are paved on the bottom layer, and sand (3) in an inverted trapezoidal shape or sand bags filled with the sand (3) is or are paved above the pebbles (4) and around the buried pipeline (1). After filling replacement is completed, the hot sticks (5) are arranged on the two sides of the buried pipeline (1) vertically. The permafrost region buried pipeline thaw collapse control device is free of movement parts and maintenance and good in reliability, and does not consume electricity.

The invention discloses an energy pile bearing performance test device. The device comprises a counter-force system, a loading system, an energy control system, a pile-soil system and a measurement and collection system. According to the collection system, the energy changing process of an energy pile and soil around the pile as well as the interaction and deformation characteristics of the pile and the soil can be visually observed, and tests on the bearing performance and the deformation characteristics of the pile, the physical and mechanical state changes and the deformation characteristics of the soil around the pile and the like in the energy changing process of the energy pile and soil body can be performed. Indoor tests for different soil bodies and different drainage working conditions can be carried out, and geotechnical centrifuge tests can also be carried out. Conventional indoor tests and geotechnical centrifuge tests such as pile-soil interaction between energy piles or between conventional pile and energy soil (frozen soil or geothermal soil or soil layers with different temperatures in deep foundations) under the action of combined load, single load, cyclic load andcombined cyclic load can be implemented.

The invention discloses a test method for researching shear slip mechanical properties of frozen soil between freezing pipe curtain pipes. The method comprises the following steps of before a test isstarted, assembling a counter-force frame assembly, a sliding assembly and a driving loading unit in a low-temperature environment test room; hoisting a shearing work unit and fixing to the sliding assembly through a hoisting tool, filling a shearing soil box defined by the shearing work unit with test soil, pushing the ready-to-fill shearing work unit into a shearing work area of a main frame, installing a shearing-resistant beam, and installing and connecting measurement sensing equipment; adjusting and enabling a power output end of a driving loading unit to abut against the corresponding position of the shearing work unit; starting a low-temperature environment testing machine air cooler and a low-temperature circulating cold bath to a set temperature at the beginning of the test, keeping the constant temperature for 36-48 hours, and starting a control system and a driving loading unit; and using the control system to make the driving loading unit apply vertical and transverse loads to the shearing soil box, and transmitting the vertical and transverse loads to the control system through a measuring and collecting system. Through dynamic feedback of a two-way load sensor and adisplacement sensor, frozen soil shearing loading of deformation control or force control is achieved, and development evolution of shearing slippage under an inter-pipe frozen soil plane strain statecan be accurately reproduced.

The invention discloses a freeze soil area oil and gas pipeline monitoring method and system and a construction method of the system. The freeze soil area oil and gas pipeline monitoring method includes the steps of conducting monitoring on the temperatures and the moisture around pipelines and the displacement of a tube bodies through temperature sensor sets, moisture sensor sets and fiber bragg grating displacement sensor sets respectively, sending signals obtained through monitoring to a photoswitch (13) through optical cables (12), sending the signals to a lower computer (15) after the signals are demodulated by an interrogator (14), enabling the lower computer (15) to call self-programmed programs, control the photoswitch (13) and the interrogator (14), collect data and preprocess the data, transmitting the preprocessed data to a low-orbit satellite (17) through a satellite communication module (16), receiving the data through the low-orbit satellite (17) and forwarding the data to a satellite communication module (18), transmitting the received data to an upper computer (19) through the satellite communication module (18), analyzing and processing the data through the upper computer (19), and judging the safety condition of the pipelines to conduct damage forecasting. The freeze soil area oil and gas pipeline monitoring method and system and the construction method of the system are high in precision, high in stability and low in cost.

The invention discloses an unfreezing embedded rod for agricultural yield increase for seasonal frozen soil, and belongs to the technical field of agricultural production. The unfreezing embedded rodcan be buried in the non-frozen soil season in advance, the low temperature is sensed through a cold sensing sheet preset outside, the cold energy is transmitted to a cold pushing trigger ball; once the freezing temperature is reached, namely before the frozen soil environment is formed, the cold pushing trigger ball is frozen in advance and indirectly punctures a heating balloon to trigger the unfreezing action; after the heating balloon is punctured, a gas-solid heating body filled in the heating balloon is released; after the gas-solid heating body is exposed in the external environment, the gas-solid heating body starts to automatically heat to provide heat; meanwhile, the impact force of the gas-solid heating body is released to extrude part of nutrients out of the unfreezing embeddedrod to enter the soil; and in addition, heat released by reaction of the gas-solid heating body can also be transferred into the soil, the soil is heated, the frozen soil phenomenon is prevented, accordingly, seasonal frozen soil is heated and thawed, and the yield of crops is increased.

The invention discloses a freezing strength on-site fast detection device for backfill soil in a frozen soil area. The device comprises a falling hammer, a guiding groove, a cushion plate, a traction line and a scaleplate. The falling hammer is lifted to a certain height through the traction line. The falling hammer makes free-fall motion along the guiding groove. Frozen soil samples placed on the cushion plate is hammered, and the freezing strength of frozen soil is judged according to the hammer falling time number generated when the samples crack. The device is used for fast judging the freezing strength of the backfill soil, easy and fast to use and easy to operate.

The invention provides a frozen soil blasting model test system and a test method thereof. The test system comprises an explosion-proof box, a frozen soil mold, a computer and a data acquisition processor. High-speed cameras are arranged at four corners of the top of an inner cavity of the anti-explosion box. A top cover is provided with a three-dimensional laser scanner. The frozen soil mold is arranged in the explosion-proof box. A frozen soil sample is arranged in the frozen soil mold. Blast holes are formed in the upper surface of the frozen soil sample according to the design. Similar explosives are arranged in the blast holes. During a test, the explosives are detonated, and the high-speed cameras are used for observing and recording a blasting process. The data acquisition processoris used for collecting and recording blasting vibration data. The test method of the test system comprises the steps of preparing the frozen soil sample; arranging the blast holes; simulating blasting; performing data acquisition; and the like. The test system is simple and convenient to operate, easy to implement and high in repeatability. The test system and method can be safely and effectivelyused for indoor frozen soil blasting model tests.

The invention relates to a method for calculating the unfrozen water content of frozen soil based on the ion concentration gradient of a clay diffusion layer. The method comprises the steps of (1) collecting a soil sample, measuring the particle size distribution of the soil and the humidity at normal temperature, determining the mass percentages of clay, silt and sand in the soil, and taking the measured soil humidity as the initial water content w0; (2) substituting the mass percentages of clay, silt and sand in the soil into a specific surface area estimation model to obtain the specific surface area AS of the soil, wherein the specific surface area estimation model refers to AS = 0.042 + 4.23 Clay% + 1.12 Silt%-1.16 Sand%, and in the formula, Clay%, Silt% and Sand% are the mass percentages of the clay, the silt and the sand respectively; and (3) establishing an unfrozen water content model shown in the description, and calculating the unfrozen water content wu. The method is simple in model expression and accurate in calculation.

The invention discloses a multi-point multi-time sampling executing mechanism suitable for frozen soil type extraterrestrial star soil, and relates to the field of deep space sampling detection. According to the environmental characteristics of the extraterrestrial stars and the distribution characteristics of the frozen soil type extraterrestrial star soil, in combination with the sampling and detecting requirements of the extraterrestrial star soil, the multi-point multi-time sampling executing mechanism suitable for the frozen soil type extraterrestrial star soil is provided. According to the scheme, the mechanism needs to be carried on a detector body and mainly comprises a core fixing mechanism, a core breaking mechanism, a two-way lead screw, a drill rod, a drill bit, a core breakingmechanism guide sleeve and the like. Under driving of two external motors, drilling action of extraterrestrial star soil is achieved through the drill bit and the drill rod; fixed-point coring, coreshearing and cutting, in-situ transferring and sample core spitting actions on frozen earth extraterrestrial star soil are achieved through design between the core fixing mechanism and the core breaking mechanism and matching of motion parameters. Through the transfer of the detector, the functions of multi-point multi-time sampling of different sampling points and the like are realized. At present, the scheme is verified by a frozen soil type extraterrestrial star soil simulation test, and the sampling effect is good.

The invention discloses a frozen soil upper limit change rule testing method. A frozen soil upper limit change rule testing device comprises an outer tank body, an inner tank body, a data collection model and a system control and data collection computer, wherein the inner tank body is located at the inner part of the outer tank body; an outer tank cover and an inner tank cover are respectively arranged on the upper ends of the outer tank body and the inner tank body; a heating module and a refrigerating module are arranged in a position between the outer wall of the left side of the inner tank body and the inner wall of the outer tank body; the heating module and the refrigerating module are respectively communicated with the inner tank body. The invention relates to the technical field of geotechnical testing and measuring. A monitoring sensor buried in a soil sample can be used for monitoring the soil sample temperature change and a moisture migration situation during frozen soil freeze thawing, initial conditions and boundary conditions of a soil temperature conduction and moisture conduction differential equation can be determined according to measured data of the monitoring sensor, analytic solution can be solved according to a variable separation method, an upper limit position change rule can be obtained by combining temperature and moisture judgment criterion and substituting the analytic solution into an analytic solution formula, testing is controlled by a computer system, and a testing result is more accurate.

The invention relates to a device and a method for manufacturing a frozen soil sample with a layered cryogenic structure. The device consists of a heat preservation box main body, a heat preservationbox upper cover, a sample cylinder, a sample cylinder upper cover, temperature control tubes, vacuum tubes, refrigeration tubes, a base seat, a temperature sensor, a moisture sensor and temperature control systems, wherein, the temperature control tubes, the vacuum tubes and the refrigeration tubes are all annular and form a closed loop with the temperature control systems and are arranged on thesurface of the outer wall of the sample cylinder; the temperature control tubes, the vacuum tubes and the refrigeration tubes are all connected with respective temperature control systems; and the temperature control systems can control the temperature of a circulating liquid in the temperature control tubes, the vacuum tubes and the refrigeration tubes; and pipe holes are formed in the heat preservation box main body and are used for the temperature control tubes, the vacuum tubes and the refrigeration tubes to pass through and fix positions of the tubes. The heat preservation box has the characteristics of simple structure, convenient operation and the like.

The invention discloses a method for installing and designing an oil pipeline in an alpine frozen soil area, which comprises the following steps of: determining the burying depth of a pipe frame foundation according to the geological condition of the frozen soil area, and checking the stability, the foundation bearing capacity, the deformation and the thermal engineering of the pipe frame foundation; determining the lengths of an evaporation section, a condensation section and a heat insulation section of the hot rod, and determining the burying distance of the hot rod according to the effective cooling radius of the hot rod; the height of a column of the pipe frame system is determined, and the strength, stability and deformation of the column and a beam in the pipe frame system are analyzed and calculated; determining a pipe frame support, modeling a pipeline installation process, performing numerical simulation analysis on the maximum stress and allowable stress of the pipeline under different stress types and different working conditions, and determining a mode and a position of pipeline stress compensation; a ground temperature monitoring system is arranged around the pipe frame foundation and used for monitoring the frozen soil temperature and the freezing and thawing conditions under the pipe frame foundation in real time; According to calculation and analysis results ofthe steps 1-5, an installation design scheme of the oil pipeline in the alpine frozen soil area is formed.

The invention relates to a simulation system and method for on-site simulation of a frozen soil environment. The system comprises a cylindrical container for containing a soil column, the bottom of the cylindrical container is provided with a weighing sensor, the upper part of the soil column is undisturbed undisturbed soil, and the lower part of the soil column is a boundary control layer filled with prepared soil; a plurality of water potential sensors and moisture sensors are uniformly distributed in the soil column and environmental soil outside a collecting box at different depths, and percolation pipes and temperature adjusting pipes are uniformly distributed in the prepared soil. The soil temperature and the soil water content in the frozen soil freezing and thawing process are physically controlled, the soil column boundary hydrothermal state the same as that of the environmental soil is achieved by controlling and monitoring the hydrothermal balance of the soil column, the specially-prepared boundary control layer provides the hydrothermal transmission condition consistent with that of the environmental soil for the soil evaporation and permeation process of the soil column, the control of the unsaturated hydraulic conductivity in the monitored soil column is realized, so that the analog simulation of the field frozen soil environment is realized.

The invention discloses a circulating compression-shear soil frost heaving test system and test method. The test system comprises a temperature control test cabin, a horizontal loading motor, a vertical loading motor, a horizontal displacement sensor, a horizontal force sensor, a vertical displacement sensor, a vertical force sensor, a pore pressure acquisition instrument, a temperature controller, a Markov water replenishing bottle and a power supply. For a test soil unit, the temperature control test chamber adopts a temperature control metal plate to form a temperature control space around a test piece, so that the test is prevented from being influenced by the atmospheric environment on one hand, and on the other hand, a laminated ring with relatively small thickness can be conveniently adopted in the test, and the loading effect of the horizontal cyclic shear stress of the soil unit is improved. The vertical direction and the horizontal direction of the soil body frost heaving test system can be set to be static or dynamic loading, a soil body frost heaving test, a soil body melting test or a soil body freezing and thawing cycle test under temperature-complex stress path coupling can be carried out, and dynamic parameters such as dynamic shear modulus and damping ratio of frozen soil or positive temperature soil can be tested.

The invention discloses a device for simulating the freezing and thawing cycle process of frozen soil. The device comprises a transparent container, an upper cold bath disc, a lower cold bath disc, a water and soil partition plate, a cavity partition plate and a cold bath tank, the upper cold bath disc covers the top of the transparent container; the lower cold bath disc covers the bottom of the transparent container; the water and soil partition plate is arranged in the transparent container and detachably arranged on the lower cold bath disc, and a water storage cavity is formed between the water and soil partition plate and the lower cold bath disc; the cavity partition plate is arranged in the transparent container, is detachably connected with the transparent container, and is used for vertically separating the interior of the transparent container into a plurality of experiment cavities; the cold bath tank is connected and communicated with the upper cold bath disc and the lower cold bath disc, and the cold bath tank is used for regulating and controlling the temperature change of the upper cold bath disc and the lower cold bath disc in the experiment process; and therefore, during application, different soil bodies can be put into different experiment cavities, so that synchronous experiment comparison is carried out, and the problem that multiple simulation experiments cannot be carried out simultaneously in the prior art is practically solved.

The invention provides a frozen soil stratum thawing settlement test simulation device and a method. The frozen soil stratum thawing settlement test simulation device comprises a reaction container provided with a reaction cavity, a pressurizing assembly, a temperature control assembly, a confining pressure assembly, a simulated guide pipe system, a drilling fluid circulating system, an acquisition and measurement device, and a control module, wherein the pressurizing assembly and the temperature control assembly are connected with the reaction container; the confining pressure assembly surrounds the side wall of the reaction container; the simulated guide pipe system comprises a guide pipe arranged in the reaction cavity and a drill rod arranged in the guide pipe in a penetrating mode, and an annulus is formed between the drill rod and the guide pipe; the drilling fluid circulating system comprises a drilling fluid storage tank, a fluid inlet pipeline communicated with the guide pipe,a fluid return pipeline communicated with the annulus, a heating device, a booster pump, a switch valve, and a filtering device arranged on the fluid return pipeline; the heating device, the boosterpump and the switch valve are arranged on the fluid inlet pipeline; the acquisition and measurement device is communicated with the reaction cavity; and the control module is connected with the pressurizing assembly, the temperature control assembly, the switch valve and the acquisition and measurement device. According to the frozen soil stratum thawing settlement test simulation device and the method, the change rule of the thawed water yield of the frozen soil layer and the stratum settlement amount under the conditions of different heating ranges and different heating temperatures can be obtained.

The invention provides a device and method for monitoring the temperature change in a frozen soil layer drilling process. The device comprises a low-temperature constant-temperature test box, a double-layer circulation pipe, a drilling fluid circulation system and a temperature measuring system, wherein sandy soil / clay with a preset moisture content is laid inside the low-temperature constant-temperature test box, and is used for forming a frozen soil simulation layer; at least a part of the double-layer circulation pipe is positioned in the low-temperature constant-temperature test box; the drilling fluid circulation system is connected with the double-layer circulation pipe and is used for enabling drilling fluid with the preset temperature to circulate in the double-layer circulation pipe; and the temperature measuring system is arranged in the low-temperature constant-temperature test box and is used for monitoring the temperature change condition of the frozen soil layer in the low-temperature test box in the whole drilling circulation process. The method comprises the following steps of preparing the frozen soil simulation layer in the low-temperature constant-temperature test box; performing drilling fluid circulation in the frozen soil simulation layer through the double-layer circulation pipe; and dynamically monitoring the temperature of the frozen soil simulation layer. The device and method provided by the invention have the advantages that the frozen soil simulation layer is prepared in the low-temperature constant-temperature test box, and the temperature change condition of the frozen soil layer in the low-temperature test box in the whole drilling circulation process can be completely monitored.

The invention relates to a method for repairing a frozen soil layer in a plateau high and cold mining area, which comprises the following steps: S100, backfilling the frozen soil layer: backfilling a slag hill or a mining pit in a layered manner, compacting in a layered manner, and paving a first fine-grain slag soil layer at the bottom of each layer; s200, a movable layer is reconstructed, specifically, a second fine-grain muck layer is laid on the frozen soil layer, and a movable relative water-resisting layer is formed; a permeable layer is laid above the movable relative water-resisting layer, and the permeable layer comprises a third fine-grain muck layer on the lower portion and a coarse-grain muck layer on the upper portion; s300, reconstruction of a protective layer: a soil matrix layer is laid above the permeable layer, a soil conditioner and the soil matrix layer are ploughed and mixed, and then organic fertilizer is applied and scattered; and S400, vegetation regeneration, wherein plants are sown on the soil matrix layer where the organic fertilizer is applied and scattered, and enclosure breeding is conducted.

The invention discloses a frozen soil shear interface layer deformation measuring system and a measuring method of the frozen soil shear interface layer deformation measuring system. The measuring system comprises a soil sample box, a soil sample, a sample preparation template, anti-tilting rods, an anti-tilting bearing, an industrial camera and an image processing device. The measuring method of the frozen soil interface layer deformation measuring system comprises the steps that the soil sample box is filled with prepared remolded soil in a layered mode, sealing is carried out through transparent adhesive tape after a soil sample interface layer is marked with white paint, the industrial camera is connected with the image processing device, image acquisition software is run, relevant parameters are set, images are automatically acquired, image measuring software is run through the image processing device, relevant parameters are set, measurement is carried out, and deformation data of interface layer soil bodies at different positions are obtained. The frozen soil interface layer deformation measuring system and the measuring method of the frozen soil interface layer deformation measuring system have the advantages that because the industrial camera and a prime lens are adopted, interface layer images can be clearly acquired; because the CMOS sensor camera is adopted, cost is low, power consumption is low, and operation is convenient to perform; deformation of the soil bodies at different positions of the interface layer can be measured; the measuring error can be as accurate as one micron.

The invention belongs to the technical field of geotechnical test equipment, and relates to a large-size frozen soil true triaxial loading test device which adopts a three-direction principal stress independent control loading mode and can well simulate a three-dimensional crustal stress state actually existing in a geological environment. The vertical principal stress is applied by a vertical loading device, the horizontal principal stress is applied by two horizontal loading devices, and the test piece is allowed to deform freely in three directions under the action of the three-dimensionalprincipal stress; the structure is simple, the operation is convenient, and the vertical loading system adopts a dynamic and static combined loading mode; a hydraulic cylinder loading mode is adoptedin four horizontal loading directions; static loading in the three-axis direction is all independently controlled, the hydraulic cylinder in each direction can move synchronously and asynchronously, each loading point can use displacement control loading or test force control loading, in the three-axis direction test, a long-time pressure stabilizing state can be achieved, and the pressure maintaining precision reaches + / -0.5%.