49 results about "Infiltrometer" patented technology

The invention discloses a comprehensive permeability testing machine for measuring vertical permeability coefficient and horizontal permeability coefficient. The invention comprises a constant-pressure water tank which is communicated with two water supply pipes, wherein, one water supply pipe is communicated with an upper pressure chamber; the top of the upper pressure chamber is provided with a barometer and an air-bleed hole and the side face of the upper pressure chamber is provided with an inflating device; the upper pressure chamber is communicated with a lower pressure chamber through an assembly member; the upper part of the lower pressure chamber is provided with a bubble exhaust hole and the lower part of the lower pressure chamber is communicated with a graduated flask through an exhaust pipe and a metered valve; the other water supply pipe is connected to the left of the assembly member; and the assembly member is communicated with the graduated flask through the exhaust pipe and the metered valve and consists of an impervious membrane, silicon rubber, a V-shaped slot board and a pressurized plastic membrane. The comprehensive permeability testing machine has the advantages that: firstly, the pressurized plastic membrane can quickly, precisely and uniformly transfer normal pressure to a sample, and the impervious membrane can prevent leakage of the sidewall; secondly, water flow is uniformly infiltrated into the V-shaped slot; thirdly, due to arrangement of the silicon rubber, the border effect is reduced; fourthly, the whole machine realizes measurement of the vertical permeability coefficient and the horizontal permeability coefficient, and is precise, simple and clean, highly efficient, practical and convenient to operate.

Determination of hydraulic properties such as porosity and permeability of soil is of paramount importance in hydrology and civil engineering. In order to achieve greater accuracy in determination of permeability of soil using falling head permeameter, the two important known constraints of human monitoring error in noting the falling water level between two selected levels and elapse time between these two levels had overcome through electronically sensing the levels between two selected points and activating the timer clock automatically by the pulses coming from senor. The precision in measurement of time lapse in 1 / 100th a second enables greater accuracy in estimation of permeability. Provision of perforated Teflon disc above and below the soil core facilitates in application of water uniformly over the entire surface area of soil core at top and similar way permeated water leaving the soil core uniformly without any obstruction. The use of carbon steel seamless tube while collecting soil core facilitated in undisturbed soil core recovery from desired depth section. The permeability test was conducted for various sorted sands of different size ranges and each sample was subjected to repetitive tests and elapsed time for each test was recorded from timer unit. Coefficient of Permeability was calculated for each test. The lab experiment conducted for sorted and unsorted sediments has yielded a consistent performance of Electronic level sensor and timer based falling head soil permeameter.

The invention is a method of determining all the components of an absolute permeability tensor of a porous medium sample from permeability measurements, obtained for example by placing the sample in a permeameter which is useful for fast determination of permeability anisotropies of rocks and detention of internal heterogeneities. A pressure difference ΔP is applied between the inlet and outlet faces of a laboratory rock sample, with zero flow conditions on the edges parallel to the mean flow obtained by confining it in a sheath under pressure. Starting from conventional permeability measurements in three directions and from the measurements of the two components of the viscous forces transverse to the sample, a permeability tensor k can be “inverted” by numerical solution of the corresponding boundary-value problem. Since these quantities can be alternatively obtained from numerical solutions of the same flow in a heterogeneous medium, the method can also be used as an upscaling tool in a reservoir simulator.

The invention discloses a permeameter used for measuring the permeability coefficient of cohesiveless soil, comprising a permeameter main body, a first porous plate, a second porous plate, a water inlet pipe, a water outlet pipe and a sand setting device, wherein, the first porous plate and the second porous plate are arranged in the permeameter main body, and the cohesiveless soil is arranged between the first porous plate and the second porous plate; the water inlet pipe is arranged at one side of the permeameter main body on which the first porous plate is arranged; the water outlet pipe is arranged at one side of the permeameter body on which the second porous plate is arranged; the sand setting device is arranged at the bottom of the permeameter main body; and at least one measuring hole is formed on the permeameter main body along the direction of the first porous plate to the second porous plate. According to the permeameter of the invention, a soil sample which has large sample particles and is suitable for high seepage gradient can be loaded in the test; the permeability test can be carried out by adopting the continuously circulating water; the influence of the air to the water stream in the soil sample can be eliminated with more accurate result. The invention also discloses a permeability coefficient measuring system with the above permeameter.

The invention discloses an intelligent early warning and forecasting method for soil slope dangerous situations. , belongs to the technical field of geology, and aims to provide an intelligent early warning and forecasting method for soil slope dangerous situations, which can accurately forecast soil slope dangerous situations, and is characterized by comprising the following steps: S1, selectinga monitored slope area, and dividing a slope into a plurality of monitoring areas according to a finite element method; S2, establishing an information acquisition system and a dangerous case prediction system, and acquiring the height, gradient and area of the monitored area through the information acquisition system; and S3, enabling the information acquisition system to send the monitoring areas to the dangerous case prediction system in a wireless mode. A soil permeameter and a displacement meter acquire the soil permeability and the soil displacement of the monitoring areas in real time;the information obtaining system obtains the heights, gradients and areas of the monitoring areas in real time, then a three-dimensional model is established through the dangerous case prediction system, the three-dimensional model obtains various parameters in real time, the slope is dynamically predicted, and prediction of the possibility of slope landslide is more accurate.

The invention discloses a method of collecting undisturbed soil permeability test soil samples by wax sealing. The method comprises the steps that 1, the soil samples are taken out by whole block, and cutting is conducted on soil samples by using a peeling method, the cutting shape is cylindrical, the diameter of each cylindrical soil sample is less than the inner diameter of sampling ring cutter, the height is greater than the height of the sampling ring cutter; 2, wax sealing is conducted on the periphery of the cylindrical soil samples, the soil samples are sealed by wax into cylindrical shapes, the diameter of each cylindrical soil sample is smaller than the inner diameter of the sampling ring cutter; 3, the inner and outer walls of the ring cutter are evenly coated with Vaseline, the wax shape cylindrical soil samples are evenly cut by the ring cutter, complete permeability test soil samples are formed from outside to inside the ring cutter, the Vaseline, the wax seal layer, and the undisturbed soil samples; 4, experiments are conducted by loading the permeability test soil samples into a permeability apparatus; 5, after the experiments are completed, the permeability coefficient calculation is conducted by replacing the cutting ring area with the actual soil sample area. The method of collecting undisturbed soil permeability test soil samples by wax sealing is simple in experiment, the original permeability performance of the undisturbed soil can be guaranteed, and the method is suitably applied to rigid hard plastic clay or strong weathered mudstone.

Disclosed is a permeameter for in-situ measurement of saturated hydraulic conductivity. The permeameter includes a chamber fixedly installed into a streambed sediment such that the inside of the chamber is filled with a medium, sediment at water-sediment interface. First and second hydraulic head-measuring lines are respectively connected to upper and lower portions of an outer circumferential surface of the chamber, these are designed for measuring a hydraulic head difference of the inside of the chamber. A flexible tube is interconnected the chamber with the storage pipe. A storage pipe is designed to regulate a hydraulic head difference from the chamber and to measure a quantity and a flow rate of water introduced from the chamber under the streambed.

The invention discloses an infiltrometer, comprising a soil tube arranged on the upper transverse plane of a horizontal board. A vertical panel is fixed against one edge of the horizontal board. A water storage tank is installed on the right side of the vertical panel. A water injection tank is connected over the water storage tank. The water injection tank communicates downward with the bottom of the water storage tank. An exhaust valve is disposed on the upper portion of the side surface of the water storage tank. A water outlet valve is mounted on the lower portion of the side surface of the water storage tank. The upper portion of the side surface of the soil tube is provided with a water inlet, which communicates with the water outlet valve of the water storage tank. A horizontal porous plate is arranged in the core space of the soil tube. The porous plate divides the core space of the soil tube into a soil holding layer and a water holding layer. The other side surface of the soil tube is equipped with a water outlet. The device provided by the invention is small in size, is easy to move and simple to operate, and is applicable to being popularized and used in teaching and tests of determining soil infiltration rate and its related parameters in a lab.

The present invention relates to an automatic seepage meter for measuring groundwater-surface water exchange in a mixed zone of stream. The present invention includes: the chamber installed in streambed sediment; the device for measuring amount of groundwater recharge through a change in water level accompanied by discharging water in the water in case of losing stream; and the device for measuring amount of groundwater discharge through a change in water level according to an increased water from the chamber to the water bath for measuring discharge in case of gaining stream.

The invention relates to a permeameter for metering an unsaturated coefficient of permeability of high-compacted bentonite and a metering system. The permeameter comprises a thick-walled sample sleeve, a water entry end cover block, a water exit end cover block and an attachment, wherein the thick-walled sample sleeve, the water entry end cover block and the water exit end cover block are made from a Teflon material, and the attachment is composed of the thick-walled sample sleeve, the water entry end cover block, the water exit end cover block and add-ons. The metering system comprises a nuclear magnetic resonance analyzer, a sustained water injection mechanism and the permeameter, wherein during testing, the permeameter loaded with a test soil sample is placed in a radio-frequency coil of the nuclear magnetic resonance analyzer, the sustained water injection mechanism is connected with a water inlet hole, and thus, permeation water pressure is provided after air of a water injectionend is exhausted. Compared with the prior art, the permeameter and the metering system have the advantages that the permeameter and the metering system adapt to technical requirements on measurement of the unsaturated coefficient of permeability of the high-compacted bentonite by adopting a nuclear magnetic resonance technique, including being capable of bearing a relatively large expansion forceand maintaining the volume of a bentonite sample during water seepage constant; materials such as Teflon and quartz sand are adopted, so that the influence on nuclear magnetic signals caused by the device can be avoided.

The invention relates to an evaporation-preventing double-ring infiltrometer easy to mount and fix. The evaporation-preventing double-ring infiltrometer is composed of a water supply bottle, an inner ring, an outer ring, a fixing and connecting rod for connecting the inner ring and the outer ring, as well as a knocking cover board and an evaporation-preventing cover board which are mounted at the tops of the inner ring and the outer ring. All the components are independent, are convenient to carry, and are assembled after on-site tests. The inner ring and the outer ring are connected and fixed by the fixing and connecting rod, so that the integral rigidity of the inner ring and the outer ring is improved, and the bottoms of the double rings are prevented from entering soil to cause deflection. The knocking cover board is additionally arranged at the tops of the inner ring and the outer ring, when the inner ring and the outer ring are knocked, the inner ring and the outer ring stably enter the soil as a whole body, and can not warp up or incline. In addition, in the liquid permeation process, since the evaporation-preventing cover board is additionally mounted at the tops of the inner ring and the outer ring, so that great evaporation caused by weather is avoided. Therefore, the infiltration boundary conditions are strictly controlled while the infiltration capacity is accurately measured, so that the accurate infiltration rate of the soil is obtained, and the infiltration characteristics of the soil are mastered.

The invention relates to a testing method, in particular to a high-pressure penetration deformation testing method of reservoir grit stone dam materials, comprising the following steps: 1) gas storage, namely, starting up an air compressor, opening a compressed air gate vale to input compressed air into a compression gas tank; 2) water supply and prepare for starting up water pump, namely, opening the water supply gate of a permeameter, a water supply control valve is under close state at the moment and waiting for being started up to supply water; and 3) water supply, namely, gyrating a compressed air regulating valve so as to supply stated pressure in accordant with test dam materials into the inner air bag of a pressure regulation chamber, meanwhile automatically opening the piston of the water supply control valve so as to provide osmotic flow with corresponding pressure. The large scale high-pressure permeameter of the invention can bear high-pressure water head more than 100 meters, the pressure of a water supply system is stable, and pressure oscillation is less than or equal to 2.7%. The dam materials which are tested by the method can be widely applied to the buildings of reservoir dam bodies.

The invention discloses a rotatable imbibition experiment device. The device comprises a glass container, a mounting seat, an electric motor, a rotating disk and a rock sample holder. The glass container is sealedly mounted on the upper end of the mounting seat. The container contains a liquid and a rock sample to be detected. The rock sample to be detected is immersed in the liquid and is clamped through the rock sample holder. The upper part of the container has a transparent measuring tube. The measuring tube has scales. The electric motor is mounted on the mounting seat and is connected to the rotating disk by a rotating shaft. The rotating disk is connected to the rock sample holder. The electric motor drives the rock sample holder to rotate in the liquid. The rotatable imbibition experiment device improves the metering precision of the oil adsorption and discharge volumes and solves the problem of measurement errors of the existing infiltrometer. The electric motor drives the rock sample holder to rotate, oil beads adhering to the surface of the rock center are separated from the surface of the rock center under action of a centrifugal force, then floats into the measuring tube under action of gravitational differentiation and then is aggregated to form oil in the measuring tube so that the metering precision of the oil adsorption and discharge volumes is improved.

The invention discloses dispersion test equipment suitable for low-permeability soil. The dispersion test equipment comprises a water pressure chamber and a permeameter chamber for accommodating a testing earth-pillar; the water pressure chamber communicates with a pressurizing chamber; the permeameter chamber is arranged in the water pressure chamber and comprises a top disc of the permeameter chamber, a bottom disc of the permeameter chamber and a cylindrical flexible side wall, wherein the top disc of the permeameter chamber and the bottom disc of the permeameter chamber are hermetically connected to two ends of the flexible side wall, separately; and the bottom disc of the permeameter chamber is connected to a tracer agent injection assembly, and the top disc of the permeameter chamber is connected to a tracer agent collecting and detecting assembly. The dispersion test equipment disclosed by the invention has the advantages that under the water pressure action of the water pressure chamber, the testing earth-pillar is tightly wrapped by the flexible side wall, so that side wall permeation caused by a gap between the testing earth-pillar and the flexible side wall is avoided; meanwhile, the testing earth-pillar is kept in a tight state by means of the water pressure, and is unlikely to break.

The invention discloses a permeability testing method and device providing osmotic pressure and confining pressure by means of a shunting bucket. The permeability testing device comprises a rock osmotic pressure chamber, a rock-soil permeameter, an air pressure supply and control system and an air pressure-water pressure conversion system, wherein the air pressure supply and control system comprises an air compressor and an air compressor regulating valve; the air pressure-water pressure conversion system comprises a water-filled pressure bucket; a lower end of the pressure bucket is providedwith a pressure overwater shunting outlet and a pressure underwater shunting outlet of different heights respectively; a three-way valve is arranged on a pipeline of the pressure overwater shunting outlet; one water outlet of the three-way valve is connected with the rock-soil permeameter through a pipeline, and the other water outlet is connected with a pressure head of a rock osmotic pressure chamber through a pipeline; and the pressure underwater shunting outlet is connected with a pressure chamber wall of the rock osmotic pressure chamber. Through adoption of the permeability testing device, the permeability characteristics of rock and rock-soil samples can be tested simultaneously, and the confining pressure and the osmotic pressure can be measured with the same set of instruments andequipment. The permeability testing device has the advantages of simple structure, convenience in operation and high measurement accuracy.

The invention discloses a saturated permeability coefficient testing system and method capable of simulating the wet-dry cycle effect of a sock-soil body. The system comprises a non-gas water preparation system, a pressure control system, a flexible wall permeameter and a drying system, wherein a non-gas water pipeline in the non-gas water preparation system and an air pressure pipeline in the pressure control system are switched in a pressure chamber and an elastic bag of an air / water pressure conversion device respectively; the pressure control system is connected with a permeability pressure chamber through the water pressure pipeline, and is used for regulating and controlling confining pressure, back pressure and water head pressure of the pressure chamber entering into the permeameter through the air / water pressure conversion device; and the permeability pressure chamber is switched in the drying system through a control valve. The system is simple and convenient in operation, elaborate to control, accurate in measurement and high in practicability, can provide new technical support for researching the wet-dry cycle permeability of the sock-soil body, and simultaneously can be used for teaching jobs.

The invention relates to a rapid testing device of permeability of rocks. The rapid testing device comprises an axial loading mechanism, at least one permeameter mounted on the axial loading mechanism, a permeation loop and a confining pressure loop, wherein the permeation loop and the confining pressure loop are connected with the permeameter; the permeameter comprises a cylinder barrel, a piston, a bottom plate, a pressure head, a porous disc and a rock sample; and the axial loading mechanism comprises a support, a screw rod, a dial indicator and a cushion block with a thrust bearing. The device provides confining pressure for the permeameter by virtue of a second plunger pump, and the plunger pump and / or a hand-operated pump and / is used for providing permeation pressure difference for the permeameter. The testing device can simultaneously perform permeability test on a plurality of rock samples, reduce the testing time and further reduce the testing cost. The device is simple to operate and reliable in performances and can be carried to a designated place by a vehicle to carry out test, thereby having extensive practicality.

The invention provides a permeation device for water and sand two-phase seepage of a fractured rock mass. The permeation device comprises a longitudinal loading mechanism, a supporting frame, a permeation device body and a pressure control device, wherein the permeation device body comprises the supporting frame, and a permeameter and a longitudinal loading mechanism which are mounted on a pedestal of the supporting frame; the longitudinal loading mechanism is mounted at the upper end in the supporting frame through a bolt; the permeameter is arranged at the lower end in the supporting frame; the permeameter comprises a cylinder base, a filter device, a gravel cavity and a water and sand cavity. The permeation device for water and sand two-phase seepage of the fractured rock mass has the advantages of stable and continuous supplying of a dynamic pressure water source, openness of sand grain loss, sand grain collection and the like; all performance indexes of a permeation system are matched, and the stability is high; an experiment can be repeatedly tested, and real and accurate test data can be guaranteed; the permeation device has certain reference significance.

The invention relates to an unsaturated coarse-grained soil permeameter and a test method thereof. Specifically, the permeameter consists of a sealed chamber, a pressurization system and a measurementsystem. The sealed chamber, the pressurization system and the measurement system are connected through air ducts and water ducts. The sealed chamber is composed of an outer chamber and an inner chamber, ceramic plates are disposed at the upper and lower surfaces of the inner chamber, and small holes are evenly distributed on the side walls of the inner chamber. The pressurization system includesan air compressor, a filter bottle, pressure regulating valves and pressurization pipes. The measurement system includes a measuring platform, a dial gauge, a barometer, measuring tubes and a water tank. Based on the principle of axis translation, the method measures the water absorption and drainage of a coarse-grained soil sample under different suction forces to obtain a soil-water characteristic curve and unsaturated permeability coefficient of the sample. Compared with the prior art, the permeameter provided by the invention can realize measurement of the soil-water characteristic curve and unsaturated permeability coefficient of coarse-grained soil, and the measuring objects can be all sandy soil, and also can be gravel soil, silt and mixed soil.

An asphalt mixture pressure type permeameter comprises a controller air storage sac, wherein the air inlet end of the air storage sac is communicated with an air-filling device through an electromagnetic air inlet valve which is installed on a guide pipe, the air outlet end of the air storage sac is communicated with a sealing cover through an electromagnetic air outlet valve which is installed on the guide pipe, the electromagnetic air inlet valve and the electromagnetic air outlet valve are connected with a controller through leads, and a pressure sensor which is connected with the controller through the lead is arranged on the side wall of the air storage sac. The asphalt mixture pressure type permeameter further comprises a timing device and a counter weight which is arranged on the edge of the sealing cover. Air is taken as medium, the controller controls the air inlet valve and the air outlet valve of the air storage sac, so the compressed air passes by an asphalt mixture test piece which is linked with the sealing cover, the pressure sensor sends the pressure signal to the controller, the controller converts the pressure signal into time signal, the timing device displays the time for reducing the air storage sac from one fixing air pressure to another fixing air pressure, so the permeability of the test piece is measured, the test time is greatly shortened, the efficiency is high, and water resources are saved.

The invention belongs to the technical field of geotechnical instruments and particularly relates to a horizontal permeameter for geotextile. The horizontal permeameter comprises a permeation measuring device and a gas and water removing device, wherein the gas and water removing device is arranged on the left side of the permeation measuring device, and the permeation measuring device comprises a first-stage support platform, a permeation chamber, an object table, a press block and a support block; the permeation chamber is arranged at the top of the first-stage support platform, an infiltration water container is arranged on the first-stage support platform on the left side of the permeation chamber, an exudation water container is arranged on the first-stage support platform on the right side of the permeation chamber, the object table is arranged at the bottom in the inside the permeation chamber, the press block is arranged above the object table, and an inverted-U-shaped groove allowing the object table to be inserted in is formed in the bottom of the press block. The horizontal permeameter for the geotextile can test the horizontal permeation performance of the geotextile in a laboratory, obtains more accurate and stable test results and has the advantages of being simple in structure and convenient to operate.

The invention relates to a shield segment joint water leakage test method. The method comprises steps of (1), making a water inlet pipe; (2), cutting a segment; (3), making a hollow square groove; (4), making a hollow square sealing pad; (5), coating waterproof glue on a groove surface; (6), assembling the segment, and accomplishing model making; (7), automatically controlling selection of permeameters; (8), loading; (9), utilizing a variable head method or a fixed head method to carry out a tunnel water leakage test; and (10), changing a loading grade, repeating the steps (8) and (9), and acquiring joint force bearing-splaying amount-water leakage relationships. The method is advantaged in that the hollow square groove is made at a segment joint, the variable head method or the fixed head method is utilized to carry out the shield tunnel joint water leakage test, a technical problem in utilizing the shield segment to carry out the tunnel water leakage test is solved, relationships between segment water leakage and influence factors are more accurately reflected, moreover, segment force bearing-joint water leakage, joint splaying amount- joint water leakage relationship curves can be acquired.

The invention relates to the technical field of edaphology, and in particular relates to a soil infiltrometer. The soil infiltrometer comprises a sample container, a first impounding reservoir, a second impounding reservoir and a water pump, wherein the sample container is positioned in the first impounding reservoir; the first impounding reservoir is positioned in the second impounding reservoir; the first impounding reservoir is greater than the sample container; the top of the sample container is opened, and the sample container is used for accommodating a soil sample; the water pump is used for injecting liquid from the second impounding reservoir into the first impounding reservoir, so that the liquid in the first impounding reservoir can flow through the soil sample from the top of the sample container and is discharged from the bottom of the sample container. The invention aims at providing the soil infiltrometer, a test device is simple, the cost is low and the carrying is convenient; a researcher doing a test outdoor can measure a soil infiltration parameter by adopting a constant head test method conveniently.

A sealing method and device suitable for a large three-way loading permeameter are provided. The method comprises the steps of: repositioning all the push plates of an instrument to the initial positions; sticking annular rubber plates around the water inlet of a water inlet plate and the water outlet of a water outlet plate, placing a rubber plate in a test chamber to cover the front side, the bottom side and the back side of the instrument; placing a customized water bladder, successively placing a geotextile and an annular rubber plate on the water inlet surface side in the water bladder, and placing an annular rubber back on a water outlet surface side; injecting a material into the water bladder from the top; placing another rubber plate; disposing a whole sealing strip in a sealing groove on the top; disposing the upper cover of the instrument; applying a certain pressure to each push plate; filling the instrument with water, and carrying out a corresponding penetration test after saturation. The sealing method and device solve the lateral seepage and the boundary effect existing in a large-scale three-way loading permeameter model test, ensures that the seepage water flows from the water inlet through the whole soil body, ensures the rationality of a test path, and guarantees the tightness of the entire instrument cavity under a high water pressure condition.

The invention discloses a micropressure permeameter, and a test method thereof, and belongs to the technical field of permeameter. According to the micropressure permeameter, a water inlet module is composed of a micro-injection pump and a microsyringe, and is used for accurate controlling of low speed flow amount; a sample cabin is composed of a specially produced cutting ring and two tunnel-shaped sand cores, and is used for accommodating samples; a pressure gradient monitoring module is composed of a first micro differential pressure gauge and a second micro differential pressure gauge, andis used for monitoring pressure change; a discharged water level control module is mainly composed of a peristaltic pump, a filter cup, and a conical flask. The test method comprises following steps:1, sample preparation; 2, sample water saturation; 3, water level leveling; and 4, flow body injection. The principle of the micropressure permeameter is different from that in the prior art that a water level is set firstly, and flow amount is monitored, so that error in measuring process of a flowmeter is avoided. The micro differential pressure gauges are used for monitoring the small pressuredifference between a water inlet end and a water outlet end, measuring of the penetration coefficients under extremely low pressure gradient conditions can be realized. The thin type cutting ring used for accommodating soil samples is specially designed, so that requirements of different mediums are satisfied.

Determination of hydraulic properties such as porosity and permeability of soil is of paramount importance in hydrology and civil engineering. In order to achieve greater accuracy in determination of permeability of soil using falling head permeameter, the two important known constraints of human monitoring error in noting the falling water level between two selected levels and elapse time between these two levels had overcome through electronically sensing the levels between two selected points and activating the timer clock automatically by the pulses coming from senor. The precision in measurement of time lapse in 1 / 100th of a second enables greater accuracy in estimation of permeability. Provision of perforated Teflon disc above and below the soil core facilitates in application of water uniformly over the entire surface area of soil core at top and similar way permeated water leaving the soil core uniformly without any obstruction. The use of carbon steel seamless tube while collecting soil core facilitated in undisturbed soil core recovery from desired depth section. The permeability test was conducted for various sorted sands of different size ranges and each sample was subjected to repetitive tests and elapsed time for each test was recorded from timer unit. Coefficient of Permeability was calculated for each test. The lab experiment conducted for sorted and unsorted sediments has yielded a consistent performance of Electronic level sensor and timer based falling head soil permeameter.

The invention provides an injector type crushed rock permeability test device capable of adding sand continuously. The injector type crushed rock permeability test device comprises a loading frame, a permeameter, a first hydraulic control system, a second hydraulic control system and a sand continuously-adding device, wherein a displacement sensor is arranged in the permeameter and is electrically connected with a paperless recorder; and the sand continuously-adding device comprises a primary sand adding channel, a fourth stop valve, an automatic sand adding device and an injector, wherein the fourth stop valve is arranged on the primary sand adding channel, one end of the primary sand adding channel is connected with the permeameter, the automatic sand adding device is connected with the primary sand adding channel, and the automatic sand adding device is provided with a sand adding opening. According to the test device, the frame material is greatly saved, the frame rigidity is enhanced, the volume of the device is reduced, the device is light, the manufacturability is improved, and the permeameter can be installed and moved easily; and besides, the injector type permeation is realized, the sand can be continuously added without machine halt, and thus the testing continuity is ensured.

The invention relates to a tester for seepage failure in a contact surface of soil and works at high stress, high hydraulic gradient, and large shear deformation, characterized in that: a confining pressure chamber is arranged on a pedestal; one end of an axial presser is connected with one end of an axial pressure rod, the other end of the axial pressure rod extends from the top of the confiningpressure chamber into the confining pressure chamber to contact with a sample cap, a permeable stone is arranged at the bottom of the sample cap, a sample is arranged below the permeable stone, and the sample is wrapped with a shrinkable tube closely; a confining pressure presser accesses from the bottom of the confining pressure chamber through pipes, and an osmotic pressure presser accesses from the bottom of the sample in the confining pressure chamber through pipes; one end of a first outlet pipe is connected with the sample cap, and the other end extends out of the confining pressure chamber; one end of a second outlet pipe is connected with the bottom of the sample from the bottom of the pedestal, and the other end is connected with a measuring cup below the pedestal. The tester canacquire accurate stress strain data of the sample with seepage stress coupling effect, and provides a theory basis for researching on the seepage stress coupling constitutive model of the contact surface of soil and works.

The invention discloses an automatic tester for variable head permeability of soil. The automatic tester comprises a permeameter, a wireless signal transmitter, a wireless signal receiver, and a computer, wherein the permeameter comprises a water supply tank, a pressurized locating element, a penetration container, an instrument base and a water flow sensor; the penetration container is arranged on the instrument base; the pressurized locating element is arranged on the penetration container; the water supply tank is connected to the penetration container through a water supply pipe; the water flow sensor is arranged on the water supply pipe and is used for measuring the water flow input into the penetration container; the water flow sensor is connected with the wireless signal transmitter via a signal; the wireless signal transmitter is connected with the wireless receiver via a signal; the wireless signal receiver is connected with the computer via a signal. By adopting the automatic tester, the test time cycle can be greatly shortened, the test error is reduced, the cost of a communication technology is reduced, the workload for setting hardware is reduced, and the data transmission efficiency is improved.

The invention discloses a comprehensive permeability testing machine for measuring vertical permeability coefficient and horizontal permeability coefficient. The invention comprises a constant-pressure water tank which is communicated with two water supply pipes, wherein, one water supply pipe is communicated with an upper pressure chamber; the top of the upper pressure chamber is provided with abarometer and an air-bleed hole and the side face of the upper pressure chamber is provided with an inflating device; the upper pressure chamber is communicated with a lower pressure chamber through an assembly member; the upper part of the lower pressure chamber is provided with a bubble exhaust hole and the lower part of the lower pressure chamber is communicated with a graduated flask through an exhaust pipe and a metered valve; the other water supply pipe is connected to the left of the assembly member; and the assembly member is communicated with the graduated flask through the exhaust pipe and the metered valve and consists of an impervious membrane, silicon rubber, a V-shaped slot board and a pressurized plastic membrane. The comprehensive permeability testing machine has the advantages that: firstly, the pressurized plastic membrane can quickly, precisely and uniformly transfer normal pressure to a sample, and the impervious membrane can prevent leakage of the sidewall; secondly, water flow is uniformly infiltrated into the V-shaped slot; thirdly, due to arrangement of the silicon rubber, the border effect is reduced; fourthly, the whole machine realizes measurement of thevertical permeability coefficient and the horizontal permeability coefficient, and is precise, simple and clean, highly efficient, practical and convenient to operate.