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30 results about "Columnar jointing" patented technology

Columnar jointing is a geological structure where sets of intersecting closely spaced fractures, referred to as joints, result in the formation of a regular array of polygonal prisms, or columns. Columnar jointing occurs in many types of igneous rocks and forms as the rock cools and contracts. Columnar jointing can occur in cooling lava flows and ashflow tuffs (ignimbrites), as well as in some shallow intrusions.

In-situ test method for surrounding rock relaxation depth in columnar jointing rock mass cavity project

InactiveCN103487797AAccurate determination of slack depthEnsure comprehensive collectionAnalysing solids using sonic/ultrasonic/infrasonic wavesUsing reradiationCombined testColumnar jointing
The invention relates to an in-situ test method for the surrounding rock relaxation depth in a columnar jointing rock mass cavity project. The in-situ test method includes the steps of designing and arranging test drilling holes which are formed in the periphery of a cavity excavated in a columnar jointing rock mass and parallel or perpendicular to the axis of a column body of the columnar jointing rock mass, selecting test projects, determining the relaxation depth, and comprehensively conducting the test. The test drilling holes are distributed in key portions of a monitored fracture surface after the cavity is excavated, surrounding rock elastic waves and jointing fissure characteristics of the monitored fracture surface of the excavated cavity are obtained through an in-situ test means which integrates digital drilling with camera shooting and integrates single hole sound waves with across hole sound waves, and the surrounding rock relaxation depth is comprehensively judged according to reduction of the wave velocity of the sound waves in an unloading relaxation area and the corresponding rock mass fracture condition. The technical scheme is simple, the test means is reliable, comprehensive collection and comparison analysis of columnar jointing rock mass unloading relaxation information are ensured, the surrounding rock relaxation depth is accurately confirmed, the in-situ test method can be widely applied to columnar jointing rock mass excavation and supporting projects such as water conservancy and hydropower projects, traffic projects and underground test site projects.
Owner:INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI

Experimental method and apparatus for shearing of structural surface of columnar jointing

The invention discloses an experimental method for shearing of a structural surface of a columnar jointing. The method comprises adjusting a rock structural surface to be located in a shearing seam of upper and lower shearing boxes; sleeving screw sleeves to five internally-inserted vertical screws, using plastic films to separate and wrap; vertically moving the internally-inserted vertical screws through adjusting rods, so that the structural surface of the columnar jointing rock is located between the shearing seam; selecting proportional epoxy resin mortar to form epoxy resin mortar; and pouring the epoxy resin mortar into the upper and lower shearing boxes for cooling and solidification. The invention further discloses an experimental apparatus comprises the upper and lower shearing boxes, the internally-inserted vertical screws and the adjusting rods, wherein a bottom of the lower shearing box is provided with vertical screw holes, walls of the lower shearing box are provided with horizontal screw holes, and contacted parts of the adjusting rods and the internally-inserted vertical screws form worm structures. According to the invention, fine adjustment of the rock position can be realized, a surface of the epoxy resin mortar can be always maintain as a plain, a molding is relatively good, problems of rock sinking in cement mortar can be solved, and thus the structural surface of the rock can be easily positioned.
Owner:INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI

Method for judging anisotropic relative relaxation thicknesses of surrounding rock of chamber of columnar jointing basalt

ActiveCN104236489AClear physical conceptsClear quantitative descriptionUsing wave/particle radiation meansColumnar jointingWave velocity
The invention relates to a method for judging the anisotropic relative relaxation thickness of surrounding rock of a chamber of a columnar jointing basalt so as to quickly and accurately judge the anisotropic relative relaxation thickness of the surrounding rock. According to the technical scheme, the method comprises the steps that 1, a top plate, a bottom plate and two side walls of a certain section of the chamber are respectively provided with a group of testing drill holes; 2, wave velocity testing is conducted through a cross hole method, and a wave velocity value tested within the range 2m away from the bottom of each drill hole serves as an original undisturbed wave velocity Vpo of the columnar jointing basalt, and wave velocities actually measured within the other ranges of the drill holes are subjected to statistics according to different depths; 3, according to the formula Kvb=(Vpm / Vpo)<2>=0.75-0.45, the relaxation disturbance wave velocity Vpm of the top plate, the relaxation disturbance wave velocity Vpm of the bottom plate and the relaxation disturbance wave velocity Vpm of the two side walls are solved respectively, the Vpms are matched with the wave velocities actually measured in the second step in the corresponding directions, and then the anisotropic relative relaxation thickness is obtained. The method is applied to the field of hydraulic anisotropic surrounding rock chamber engineering.
Owner:POWERCHINA HUADONG ENG COPORATION LTD

Method for preparing gouge mark structure-containing columnar jointing sample for seepage test

The invention discloses a method for preparing a gouge mark structure-containing columnar jointing sample for a seepage test. The method comprises measuring a geometrical shape, occurrence, a column diameter, columnar jointing width, a jointing filling degree, and cylindrical surface gouge mark structure stripe width and thickness of the condensing surface of a basalt columnar jointing rock in situ, according to a similarity ratio principle, building a 3D reduced scale geometric model through Revit software, introducing the 3D reduced scale geometric model into a 3D printer, respectively filling two nozzles of the 3D printer with basalt powder as a columnar material and secondary yellow mud as a jointing material, and carrying out synchronous printing to obtain a sample of a gouge mark structure-containing columnar jointing network model, wherein after later processing and curing, the model can be used for a columnar jointing rock seepage test. Through use of the jointing surface gouge mark structure, the sample can really reflect the structure and shape of the gouge mark structure-containing columnar jointing network model and can provide a novel research idea for anisotropic seepage of the columnar jointing.
Owner:HOHAI UNIV

Method for measuring depth of loose ring of deeply-buried columnar jointed rock tunnel

The invention provides a method for measuring the depth of a loose ring of a deeply-buried columnar jointed rock tunnel. The method comprises the steps that firstly, holes are formed in the rear portion of a tunnel face of the tunnel and used for installing Bragg fiber grating sensors; the interface of the loose ring of the deeply-buried columnar jointed rock tunnel is measured according to readings of the Bragg fiber grating sensors, and then the depth of the loose ring is obtained; fracture pressure and reopening pressure of cylindrical surfaces on the two sides of the interface of the loose ring are measured through a cyclic pressure water test method; by analyzing the difference value of the measured fracture pressure and the measured reopening pressure, the depth of the loose ring of the columnar jointed rock tunnel is further determined accurately. The method is combined with a testing method to conduct correction mutually, data measured by the grating sensors are monitored and analyzed by means of the optical principle, and measured data are accurate, intuitive and easy to distinguish; furthermore, the loose interface and depth are determined accurately according to data, measured by the grating sensors, of the loose interface and depth of the columnar jointed rock tunnel through pressure water testing.
Owner:POWERCHINA HUADONG ENG COPORATION LTD

Tension experiment device and method of columnar jointing structural surface

The invention discloses a tension experiment device of a columnar jointing structural surface. The tension experiment device comprises a tester base, two screw rods, an adhesion plate and a carrying plate, wherein the two screw rods are arranged on the tester base; two ends of a penetration iron rod are movably connected with the two screw rods respectively; the penetration iron rod penetrates through a cylindrical iron plate; the cylindrical iron plate is connected with an upper-end-surface iron plate; the carrying plate is arranged above the adhesion plate; the adhesion plate is connected with the carrying plate through a connecting rod and is connected with a lower-end-surface iron plate; the upper and lower end surfaces of a columnar jointed rock are adhered to the upper-end-surface iron plate and the lower-end-surface iron plate respectively. The invention also discloses a tension experiment method of the columnar jointing structural surface. The method has the advantages of simple structure and convenience in operation; the tension experiment can be performed on the columnar jointing structural surface effectively and quickly; sample processing is not needed, and breakage or weakening caused by processing of the jointed rock is avoided; the method is suitable for the large-scale rock sample experiment and facilitates the dimensional effect on rock research.
Owner:INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI

Test method for simulating tunnel to pass through columnar jointed rock mass

The invention discloses a test method for simulating a tunnel to pass through columnar jointed rock mass. The test method comprises the following steps of: step 1, adding a mixture of water and lime into a polygon prism mold to form rock models; then adding an argillaceous filler among the plurality of rock models to form a columnar jointed rock mass model; 2, applying an external load to the outer side of the columnar jointed rock mass model, and then performing simulated excavation on the columnar jointed rock mass model to form a simulated tunnel; 3, arranging a displacement sensor and a stress sensor on the inner surface of the simulated tunnel, and continuously applying an external load to the excavated columnar jointed rock mass model until the columnar jointed rock mass model is damaged; and 4, processing measurement data of the displacement sensor and the stress sensor, and then exploring the damage mechanism and the mechanical property change of the tunnel surrounding rock of the columnar jointed rock mass. With the test method for exploring the mechanical property and failure mechanism of the tunnel surrounding rock of the columnar jointed rock mass adopted,the possibility of accidents in the tunnel construction process is effectively reduced.
Owner:CHANGAN UNIV

Columnar joint surrounding rock anti-relaxation supporting method for underground cavern

ActiveCN112483121AEffective control of relaxationEffective damage controlUnderground chambersHydro energy generationShotcreteSoil science
The invention discloses a columnar joint surrounding rock anti-relaxation supporting method for underground cavern excavation. The columnar joint surrounding rock anti-relaxation supporting method caneffectively control the relaxation deformation and damage phenomena of columnar joint rock mass due to excavation unloading, and has important significance for engineering safety and economy. The method comprises the following steps that geological survey is conducted on the columnar joint rock mass in an excavation area, an indoor mechanical test is carried out, and rock mass mechanical parameters are obtained and calibrated; a cavern excavation calculation model is established, surrounding rock excavation unloading numerical simulation is carried out, the relaxation depth and relaxation range are determined, and the aging characteristic and anisotropic characteristic of relaxation deformation are analyzed; cavern excavation is conducted in a layered mode, the excavation face is sealed through shotcrete after excavation of all layers is completed, and prestressed anchor rods are arranged according to the surrounding rock relaxation range for primary tensioning; according to the columnar joint rock mass excavation unloading aging characteristic, the area with the large relaxation depth is reinforced through prestressed anchor cables and subjected to primary tensioning; and grouting holes are drilled, and consolidation grouting is conducted on surrounding rock.
Owner:POWERCHINA HUADONG ENG COPORATION LTD

Support structure and columnar jointing basalt internal deeply-buried cavern excavation support method

The invention relates to a support structure and a columnar jointing basalt internal deeply-buried cavern excavation support method. The support structure is simple and easy to implement, and the columnar jointing basalt internal deeply-buried cavern excavation support method can shorten the construction period and reduce the construction cost. According to the technical scheme, the support structure is characterized by comprising a nanosteel fiber reinforced concrete layer sprayed onto an excavation surface, the surface of the nanosteel fiber reinforced concrete layer is covered by a reinforcing bar mesh which is fixed onto the excavation surface through pre-stressed anchors, and a plain concrete layer is sprayed onto the surface of the reinforcing bar mesh . The support structure and thecolumnar jointing basalt internal deeply-buried cavern excavation support method are applicable to excavation support design of columnar jointing basalt internal deeply-buried cavern sidewalls in industries such as civil construction, hydropower engineering, mining, energy storage and scientific research.
Owner:POWERCHINA HUADONG ENG COPORATION LTD

Method for preparing columnar jointing rock sample

The invention discloses a method for preparing a columnar jointing rock sample. The method comprises steps of selecting an area to be subjected to columnar jointing research, and acquiring the three-dimensional digital information of each jointing rock block in an irregular columnar jointing rock body; then, adopting hot melt resin as a rock-like jointing material to be applied to 3D printing of acolumnar jointing mold; injecting the cement paste into a mold through a vacuum negative pressure method by utilizing a gas-liquid balance principle, and carrying out maintenance treatment; when thecement paste enters a plastic state, heating and softening the resin, and applying a dislocation torque to enable the sample to be dislocated along a preset dislocation belt. The method is advantagedin that the fusible epoxy resin is adopted to simulate a jointing model, property of the epoxy resin is close to that of real rock, columnar jointing characteristics of the rock mass can be truly reflected, and problems that a complete columnar joint rock mass sample at a dam foundation on site is difficult to collect, and jointings are prone to being broken by external stress in the coring process are solved.
Owner:HOHAI UNIV

Preparation method of columnar jointing basalt undisturbed rock core

InactiveCN109632369AReduce Shock DisturbanceAvoid Disturbance DamageWithdrawing sample devicesPreparing sample for investigationRock coreColumnar jointing
The invention provides a preparation method of a columnar jointing basalt undisturbed rock core. The preparation method comprises the following steps that (1) an area where columnar joints and underground water are developed at the same time is selected, and a sampling hole is excavated; (2) freezing construction is carried out; (3) sampling is carried out; (4) chemical erosion is carried out; and(5) the rock core is prepared. According to the preparation method, composition components and high-temperature sensitivity of basalt are fully utilized, a freezing method is adopted to ensure that alarge-scale columnar joint rock mass is obtained, and the internal initial structural features are effectively retained; and meanwhile, the joint surface is weakened by adopting a chemical method instead of a physical method, so that disturbance damage to the rock mass is avoided. According to the preparation method o the columnar jointing basalt undisturbed rock core, impact disturbance on the rock core can be effectively reduced, and the undisturbed original rock core is guaranteed to be obtained to the maximum degree.
Owner:POWERCHINA HUADONG ENG COPORATION LTD

Columnar joint sample pasting device

The invention discloses a columnar joint sample pasting device, which comprises a bracket and a sample constraint structure, wherein the bracket comprises two groups of first lower brackets and two groups of second lower brackets which are symmetrically distributed; the first lower brackets are positioned on the inner side of the second lower brackets; an adjusting rod is fixed at the top part ofone group of second lower brackets; the top part of the other group of second lower brackets is connected with an upper bracket; the top parts of the two groups of first lower brackets are connected with upper brackets; a lower constraint plate is arranged between the two groups of upper brackets located at the top parts of the first lower brackets; an upper constraint plate is arranged between the adjusting rod and the upper bracket located at the top parts of the second lower brackets; the upper constraint plate and the lower constraint plate form the sample constraint structure; and a longitudinal strain gauge pasting opening and a transverse strain gauge pasting opening are formed in the upper constraint plate. According to the columnar joint sample pasting device, a columnar joint sample is fixed by adopting the rubber plates with high flexibility, damage to the sample in the pasting process is reduced, meanwhile, the T-shaped pasting openings with fixed positions are formed, theposition can be fixed, and then the reliability and accuracy of data acquisition are guaranteed.
Owner:HOHAI UNIV

Preparation method of irregular columnar jointed rock mass sample of nested interlayer staggered belt

The invention discloses a preparation method of an irregular columnar jointed rock mass sample with nested interlayer staggered belts. The method comprises the following steps: manufacturing an internal mold according to the rock mass structure characteristics of an engineering site, the internal mold comprising a three-dimensional polygonal joint surface grid used for simulating the columnar joint structure characteristics, an interlayer dislocation zone simulation component being nested in the joint surface grid, the joint surface grid being made of a water-soluble material, and the dislocation zone simulation component being made of a soluble material; pouring a joint column similar material into the joint surface grid, dissolving the joint surface grid with water after final setting, then pouring the joint surface similar material into the dissolved part, dissolving the dislocation zone simulation component with a solvent after final setting of the part, and then pouring the dislocation zone similar material into the dissolved cavity; and finally curing to obtain the sample. According to the method, the columnar jointed rock mass sample containing the interlayer dislocation zone can be simply and conveniently prepared, and a test basis is provided for research on the mechanical seepage permeability of the rock mass.
Owner:HOHAI UNIV

A Method for Determining Rigidity of Columnar Joint Rock Joints in Block Discrete Elements

ActiveCN110378030BSolve problems that are difficult to accurately calibrateOptimize the effect of anti-analysisArtificial lifeDesign optimisation/simulationAlgorithmClassical mechanics
The invention discloses a method for determining the stiffness of columnar joint rock joints in a block discrete element, comprising the following steps: writing a parameter correction program based on an optimization algorithm, setting initial parameters and an objective function; calling an anti-analysis startup file; calling a parameter correction program , generate an initial command stream file containing numerical parameters according to the initial parameters; call the initial command stream file to perform numerical calculations on the numerical model under the current parameters, and obtain the monitoring results of the numerical model; call the parameter correction program to correct the numerical parameters in combination with the current monitoring results, and Update the command flow file; return to continue the calculation or terminate the calculation according to whether the updated command flow file contains a recursive algorithm. The method uses recursive algorithm to realize the cyclic calculation of the model, and realizes the correction of the numerical parameters by calling the developed parameter correction program based on the optimization algorithm during the cyclic calculation process, thereby realizing the parameter back analysis in the block discrete element.
Owner:HOHAI UNIV

Reconstruction method of columnar jointed rock and reconstruction body of columnar jointed rock

The invention provides a columnar jointed rock mass reconstruction method and a columnar jointed rock mass reconstruction body, and relates to the technical field of rock mass engineering. The methodincludes determining a material corresponding to each feature structure in a rock mass model, wherein the rock mass model includes at least one feature structure of a columnar jointed rock mass; generating the columnar jointed rock mass reconstruction body according to the rock mass model and the material corresponding to each feature structure. A plurality of columnar jointed rock mass reconstruction bodies with the same structure can be generated through the preset rock mass model by combining the material corresponding to each feature structure of the columnar jointed rock mass, and a destructive test can be performed on the plurality of columnar jointed rock mass reconstruction bodies with the same structure under different mechanical conditions. The problem that the mechanical properties and mechanical change laws of the columnar jointed rock mass of the same structure cannot be obtained is solved, and the accuracy of the mechanical properties and the change laws of the obtained columnar jointed rock mass is improved. At the same time, the flexibility of obtaining the mechanical properties and the change laws of the columnar jointed rock mass is improved.
Owner:INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI +1

Chemical method for changing weak ecological environment of loess area and increasing arable land

The invention discloses a chemical method for changing the weak ecological environment of a loess area and increasing the arable land. The method includes the steps of firstly, bulldozing and leveling loess hills, table lands, ridges and other places needing to be improved; secondly, measuring the before-improvement compactness, permeability coefficient and water content of loess; thirdly, conducting sprinkling-irrigation of a grouting material on the places needing to be improved, wherein the grouting material infiltrates downwards along perpendicular columnar jointing of loess, and when reaching a preset underground position, the grouting material rapidly expands and cures so as to block the perpendicular columnar jointing so that the effect of a water-resisting layer can be achieved; fourthly, the water content of improved soil is increased, so the water molecules of the soil can infiltrate and break the microstructure and perpendicular columnar jointing of loess, and the permeability or permeability coefficient of the improved soil is tested; fifthly, the water content of the improved soil is detected, and plantable plants are determined. The method has the advantages that the microstructure of soil is changed, water can infiltrate the structure of the soil, and the weak ecological environment of the loess area is effectively improved.
Owner:大连久鼎生态流域治理开发有限公司

An Experimental Method for Tensioning of Columnar Joint Structural Surface

The invention discloses a tension experiment device of a columnar jointing structural surface. The tension experiment device comprises a tester base, two screw rods, an adhesion plate and a carrying plate, wherein the two screw rods are arranged on the tester base; two ends of a penetration iron rod are movably connected with the two screw rods respectively; the penetration iron rod penetrates through a cylindrical iron plate; the cylindrical iron plate is connected with an upper-end-surface iron plate; the carrying plate is arranged above the adhesion plate; the adhesion plate is connected with the carrying plate through a connecting rod and is connected with a lower-end-surface iron plate; the upper and lower end surfaces of a columnar jointed rock are adhered to the upper-end-surface iron plate and the lower-end-surface iron plate respectively. The invention also discloses a tension experiment method of the columnar jointing structural surface. The method has the advantages of simple structure and convenience in operation; the tension experiment can be performed on the columnar jointing structural surface effectively and quickly; sample processing is not needed, and breakage or weakening caused by processing of the jointed rock is avoided; the method is suitable for the large-scale rock sample experiment and facilitates the dimensional effect on rock research.
Owner:INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI

Fittings for preparing cuboid columnar jointing rock test sample

The invention relates to fittings for preparing a cuboid columnar jointing rock test sample. The fittings comprise a first driving plate, a first driven plate, a second driving plate and a second driven plate, wherein two sides of the four components are sequentially connected to form a hollow cuboid structure for holding a columnar jointing rock mold; an inner cavity is formed inside the cuboid structure; the first driving plate and the second driving plate of the hollow cuboid structure can be moved freely. By adopting the fittings, the columnar jointing rack can be prepared, combined, polished and the like, jointing is prevented from damage when a large-size test sample is cut, and meanwhile due to a fastening function of the fittings upon the test sample, the problem that the jointingis cracked in the polishing process is overcome.
Owner:HOHAI UNIV

An evaluation method for unloading relaxation of high dam rock mass based on fusion of test and monitoring data mining

ActiveCN111764369BPerfect test and evaluation systemThe evaluation results are in line with the actualIn situ soil foundationLithologyLongitudinal wave
The invention discloses a method for evaluating unloading and relaxation of high dam rock mass by combining test and monitoring data mining. Firstly, based on the different degrees of quality reduction of rock mass at different depth positions, the variation coefficient of longitudinal wave velocity in non-columnar joint rock mass and The relationship between the impact on the quality of the rock mass; then, combined with the indoor test of the acoustic wave testing system, the relationship between the change coefficient of the longitudinal wave velocity in the rock mass after the excavation of the columnar joint rock mass and the impact on the quality of the rock mass is determined; the introduction of lithology, structural plane , protective layer and other factors, establish a method for estimating the relaxation depth of the untested area after excavation of the dam foundation. The invention considers the influence of engineering rock mass lithology, structure surface exposure and excavation measures on the unloading relaxation depth after rock mass excavation, which is more scientific and more in line with actual engineering conditions. This estimation method can provide a criterion for the excavation of high dam foundation rock mass engineering, and has strong practicability and wide applicability.
Owner:HOHAI UNIV +1

Columnar jointed rock mass slope anchor cable supporting method

InactiveCN105350549AOvercome rationalityOvercome the disadvantages of poor support effectExcavationsColumnar jointingGeophysics
The invention discloses a columnar jointed rock mass slope anchor cable supporting method. Drilled holes are arranged in rows, and the holes in the corresponding positions in every two adjacent rows are staggered by a certain distance in height. Two drilled holes are formed in the same hole position and are in the leftward direction and the rightward direction respectively. Each left drilled hole and the corresponding right drilled hole are formed in the same plane, and the plane is perpendicular to the columnar jointing axial direction. Therefore, a three-dimensional anchor cable network perpendicular to the columnar jointing axial direction is formed. The defects that in the traditional technology, anchor cable stress is unreasonable, and the supporting effect is poor are overcome. The three-dimensional anchor cable network is formed, anchor cable stress is reasonable, and the supporting effect is good.
Owner:HOHAI UNIV

Judgment method of anisotropic relative relaxation of surrounding rocks in columnar jointed basalt chambers

The invention relates to a method for judging the anisotropic relative relaxation thickness of surrounding rock of a chamber of a columnar jointing basalt so as to quickly and accurately judge the anisotropic relative relaxation thickness of the surrounding rock. According to the technical scheme, the method comprises the steps that 1, a top plate, a bottom plate and two side walls of a certain section of the chamber are respectively provided with a group of testing drill holes; 2, wave velocity testing is conducted through a cross hole method, and a wave velocity value tested within the range 2m away from the bottom of each drill hole serves as an original undisturbed wave velocity Vpo of the columnar jointing basalt, and wave velocities actually measured within the other ranges of the drill holes are subjected to statistics according to different depths; 3, according to the formula Kvb=(Vpm / Vpo)<2>=0.75-0.45, the relaxation disturbance wave velocity Vpm of the top plate, the relaxation disturbance wave velocity Vpm of the bottom plate and the relaxation disturbance wave velocity Vpm of the two side walls are solved respectively, the Vpms are matched with the wave velocities actually measured in the second step in the corresponding directions, and then the anisotropic relative relaxation thickness is obtained. The method is applied to the field of hydraulic anisotropic surrounding rock chamber engineering.
Owner:POWERCHINA HUADONG ENG COPORATION LTD

Preparation method of irregular columnar jointed rock mass sample with nested interlayer dislocation zone

The invention discloses a method for preparing an irregular columnar joint rock mass sample with a nested interlayer dislocation zone, which comprises the following steps: making an internal mold according to the structural characteristics of the rock mass at the engineering site, and the internal mold includes a columnar joint structure feature for simulating The three-dimensional polygonal joint surface grid of the joint surface grid is nested with interlayer fault zone simulation components, wherein the joint surface grid is made of water-soluble materials, and the fault zone simulation components are made of soluble materials; Pouring joint column similar material in the joint surface grid, after the final setting, dissolve the joint surface grid with water, then pour joint surface similar material in the dissolved part, and dissolve the staggered band simulation member with solvent after the final setting of the part , and then pour the similar material of the dislocation zone into the dissolved cavity; finally maintain and obtain the sample. This method can simply and conveniently prepare columnar jointed rock mass samples with interlayer dislocation zone, which provides an experimental basis for the study of mechanical seepage and permeability of this type of rock mass.
Owner:HOHAI UNIV

In-situ test method for relaxation depth of surrounding rock in columnar joint rock cavern engineering

The invention relates to an in-situ test method for the surrounding rock relaxation depth in a columnar jointing rock mass cavity project. The in-situ test method includes the steps of designing and arranging test drilling holes which are formed in the periphery of a cavity excavated in a columnar jointing rock mass and parallel or perpendicular to the axis of a column body of the columnar jointing rock mass, selecting test projects, determining the relaxation depth, and comprehensively conducting the test. The test drilling holes are distributed in key portions of a monitored fracture surface after the cavity is excavated, surrounding rock elastic waves and jointing fissure characteristics of the monitored fracture surface of the excavated cavity are obtained through an in-situ test means which integrates digital drilling with camera shooting and integrates single hole sound waves with across hole sound waves, and the surrounding rock relaxation depth is comprehensively judged according to reduction of the wave velocity of the sound waves in an unloading relaxation area and the corresponding rock mass fracture condition. The technical scheme is simple, the test means is reliable, comprehensive collection and comparison analysis of columnar jointing rock mass unloading relaxation information are ensured, the surrounding rock relaxation depth is accurately confirmed, the in-situ test method can be widely applied to columnar jointing rock mass excavation and supporting projects such as water conservancy and hydropower projects, traffic projects and underground test site projects.
Owner:INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI

Sample preparation mold and sample preparation method for complex rock mass structure containing multiple interlayer staggered belts and columnar joints

PendingCN114459855AThe method is simple and reliableOvercome the disadvantages of being greatly affected by the environment and poor economyPreparing sample for investigationCrystallographyBedrock
The invention discloses a sample preparation mold and a sample preparation method for a complex rock mass structure containing multiple interlayer staggered belts and columnar joints. The sample preparation mold comprises a restraint plate, a connecting mechanism, a sample preparation base and an inclination angle control mechanism (5); scale marks are arranged on the surface of a restraint plate of the sample preparation mechanism, and simulation positions of a bed rock mass, an interlayer staggered belt and a columnar jointed rock mass can be calibrated through scale setting; the columnar joint structure is realized through a 3D printing technology; the sample preparation mold provided by the invention is simple in structure, can be used for accurately and quickly preparing a simulation sample containing a multi-layer interlayer staggered belt and columnar joint complex rock mass structure, and is beneficial to experimental research on permeation, strength and deformation behaviors of the interlayer staggered belt and columnar joint complex rock mass, so that an accurate and reliable test result is obtained.
Owner:POWERCHINA HUADONG ENG COPORATION LTD

Preparation method of columnar joint specimen with chisel structure for seepage test

The invention discloses a method for preparing a gouge mark structure-containing columnar jointing sample for a seepage test. The method comprises measuring a geometrical shape, occurrence, a column diameter, columnar jointing width, a jointing filling degree, and cylindrical surface gouge mark structure stripe width and thickness of the condensing surface of a basalt columnar jointing rock in situ, according to a similarity ratio principle, building a 3D reduced scale geometric model through Revit software, introducing the 3D reduced scale geometric model into a 3D printer, respectively filling two nozzles of the 3D printer with basalt powder as a columnar material and secondary yellow mud as a jointing material, and carrying out synchronous printing to obtain a sample of a gouge mark structure-containing columnar jointing network model, wherein after later processing and curing, the model can be used for a columnar jointing rock seepage test. Through use of the jointing surface gouge mark structure, the sample can really reflect the structure and shape of the gouge mark structure-containing columnar jointing network model and can provide a novel research idea for anisotropic seepage of the columnar jointing.
Owner:HOHAI UNIV

Physical chemistry method for changing fragile ecological environment in loess area and increasing arable land

The invention discloses a physical chemistry method for changing a fragile ecological environment in a loess area and increasing arable land. The method includes the steps of 1, conducting bulldozing leveling on loess hills, table land and ridges which need to be improved; 2, measuring the compactness, permeability coefficient and moisture content of loess before improvement; 3, destructing columnar jointing of the loess through dynamic compaction of a dynamic compaction machine, and eliminating subtle channels which make water permeate downward and are produced by columnar jointing; 4, sprinkling a grouting material on the loess after the dynamic compaction, wherein the grouting material permeates along the vertical columnar jointing of the loess, and the grouting material expands and solidifies rapidly when permeating into a predetermined position under the earth surface and thus blocks the vertical columnar jointing; 5, detecting the permeability, compaction degree and moisture content of the improved loess, and determining plants which can be planted. The physical chemistry method has the advantages of effectively preventing soil and water loss in the loess area, changing the soil microstructure, making the water conserved in the soil structure, and effectively improving the fragile ecological environment in the loess area.
Owner:大连久鼎生态流域治理开发有限公司
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