60 results about "Percolation test" patented technology

The invention provides a soil permeability test device suitable for gradient variable-temperature freeze-thaw cycle test, which comprises a temperature control cylinder formed by axially extending and combining a plurality of annular insulating cylinders with hollow structures, an insulating and heat-conducting soil sample cylinder is mounted in a central chamber formed by the temperature control cylinder, a water storage chamber is arranged on one side of the soil sample cylinder, and a water outlet is formed in the other side of the soil sample cylinder. A porous anode plate is arranged between the water storage chamber and the soil sample cylinder, a water collecting chamber is arranged on the other side of the soil sample cylinder, a porous cathode plate is arranged between the water collecting chamber and the soil sample cylinder, an orifice plate flowmeter is arranged between the water collecting chamber and the porous cathode plate, and the water storage chamber is connected with a water supply system; a pore pressure sensor and a temperature sensor are installed on the side wall of each annular insulating cylinder, and each annular insulating cylinder is connected with a refrigeration module and a heating module. The device can simulate a real environment to perform freezing and thawing and gradient temperature control on the sample, can effectively simulate a real geological environment in an alpine region, and provides a scientific basis for research on permeability of frozen soil under a gradient freezing and thawing cycle condition.

The invention discloses a slag permeability coefficient depth distribution prediction method considering a particle crushing effect, and belongs to the technical field of rock-soil body performance prediction. According to the invention, a dynamic triaxial test is carried out on a slag sample, and the dynamic evolution law of grain composition and breakage rate of slag at different depth sites after different vibration times of loading is explored. Meanwhile, a seepage test is carried out on the slag subjected to cyclic loading and crushing through a seepage erosion simulation test device, the critical hydraulic gradient of migration and structural damage of fine particles in the slag of different grades under the seepage erosion effect is explored, the degradation and damage mechanism of the slag is revealed, and a negative index continuous grade formula is used as a hub; according to the method, a prediction model of the particle crushing index and the permeability coefficient is constructed, and the internal mechanism of the particle crushing behavior and the permeability characteristic evolution of the slag roadbed under the cyclic load effect is disclosed, so that the predicted permeability coefficient is closer to the actual permeability coefficient, and the prediction precision is improved.

The invention relates to a large-strain consolidation algorithm, equipment and medium for horizontal vacuum dehydration of sludge, and the algorithm comprises the following steps: 1, obtaining basic parameters of a constitutive relation of a target soil body through an indoor consolidation experiment and a penetration experiment, 2, obtaining load conditions of the target soil body through surveying a geological exploration report and an engineering design scheme, the method comprises the steps of (1) establishing a one-dimensional PHD consolidation model, (2) establishing a one-dimensional PHD consolidation model and deducing a control equation under equal strain conditions, (3) introducing a virtual time step and calculating the consolidation degree in a manner of carrying out segmented increment processing on time, (4) establishing the one-dimensional PHD consolidation model and deducing a control equation under equal strain conditions, and (5) calculating the final consolidation degree based on the virtual time step and the control equation, and further comprises equipment and a medium. According to the method, the influence of non-uniform consolidation is incorporated into the one-dimensional theoretical consolidation analysis of the Taisha foundation, and the consolidation coefficient is corrected by using the control equation based on the virtual time step and the strain condition, so that convenient and accurate consolidation calculation is realized.

The invention provides a sludge solidified soil permeability optimization method, and belongs to the technical field of soil permeability, and the method comprises the following steps: collecting multiple layers of sludge samples, and carrying out detailed physical and chemical characterization on the multiple layers of sludge samples, including water content, granularity, specific surface area and other indexes; and determining sludge solidified soil samples with different proportions by adopting a curing agent dosage equation set according to a characterization result. The optimal water content, the maximum dry density and the permeability coefficient of each sample are obtained through a standard compaction test and a variable head permeability test. And establishing a relation model of the sludge solidified soil ratio and the permeability coefficient by utilizing multiple regression analysis, and identifying key factors influencing the permeability. Based on key factors, designing and optimizing an experimental scheme, adjusting the type and dosage of a curing agent, preparing an optimized sludge solidified soil sample, and verifying the improvement of the permeability coefficient. According to the method, the permeability of the sludge solidified soil can be effectively optimized, and the problems that a sludge solidification formula is difficult to optimize and the permeability of a solidified product is difficult to improve in the prior art are solved.

The invention discloses a system for simulating the design and construction of an LID facility in the construction process of a sponge city, and relates to the field of environmental engineering, the system comprises a base plate, and a raw water tank used for containing sewage as a water source required by the system; a water distributor is arranged at the top of the penetration test column and is used for simulating a natural rainfall process; the regulation and storage tank is used for storing effluent of the penetration test column for later use; the at least one LID facility test box is used for simulating an LID facility structure layer; and the tail water tank is used for storing system tail water. Compared with the prior art, the operation condition of the LID facility under the real condition can be simulated, the method is used for analyzing the LID facility, and design and construction of the LID facility in the sponge city construction process are guided.

The invention discloses a root-soil complex ice-snow-water permeability coefficient detection method and system, and the detection method comprises the steps: obtaining a root-soil complex sample, and placing the sample in a sample barrel; setting an environment temperature for the sample barrel, and obtaining a temperature environment of the test soil; acquiring soil data of test soil based on a sensor; and based on the soil data, obtaining the ice, snow and water permeability coefficient of the root-soil complex sample. The problems that the influence of solid-liquid phase change and temperature gradient on soil water transportation in the simulated snow melting process is difficult to analyze due to the fact that a penetration test is carried out mostly based on a rainfall or normal temperature state in the prior art, and real-time and accurate determination cannot be carried out in the ice and snow water penetration coefficient detection are solved. Therefore, the real situation is comprehensively simulated based on the arrangement of the test soil and the ice and snow layer and the maintenance of the environment, the real-time acquisition of the ice and snow water permeability coefficient is realized, and the acquisition precision of the permeability coefficient is improved.

The invention relates to a multifunctional automatic unsaturated soil triaxial penetration test device and a method thereof. The multifunctional automatic unsaturated soil triaxial penetration test device comprises a triaxial chamber, a confining pressure applying system, an axial force applying system, an air pressure applying system, a water pressure applying system and a control acquisition system, the triaxial chamber comprises a loading frame and a glass cylinder, the loading frame blocks the upper and lower ends of the glass cylinder, a sample is arranged on the loading frame in the glass cylinder, and clay plates are arranged at the upper and lower ends of the sample; the confining pressure applying system respectively penetrates through the bottom and the top of the loading frame and is communicated with the inner cavity of the glass cylinder; the axial force applying system downwards abuts against the argil plate above the sample; the air pressure applying system penetrates through the bottom of the loading frame and is communicated with upper and lower ends of the sample; the water pressure applying system penetrates through the top of the loading frame, is communicated with the inner cavity of the glass cylinder, penetrates through the bottom of the loading frame and is communicated with the two argil plates respectively; according to the invention, multi-functionalization of the unsaturated soil test instrument is realized, and research on physical and mechanical properties of unsaturated soil is facilitated.

The invention discloses a rock and soil medium parameter testing and reinforcing method which comprises the following steps: step 1, arranging a plurality of in-situ testing holes and object detection lines on a side slope, a foundation or a filling site, and performing in-situ tests and geophysical prospecting tests, including in-situ drilling shear tests, penetration tests and pore pressure observation, the mechanical property, the permeability characteristic and the pore water pressure parameter of the soil layer are obtained; 2, according to the obtained soil layer parameters, the needed initial grouting pressure, flow and slurry concentration are calculated; 3, grouting equipment is used for injecting grout into the soil layer, and the deformation amount, the pressure change and the permeability change of the soil layer are monitored in the grouting process; 4, according to data monitored in real time, the grouting pressure and flow are adjusted so as to ensure the grouting uniformity and the reinforcing effect, compared with a traditional empirical grouting method, the method has the advantages that the reinforcing uniformity and the anti-seepage effect can be remarkably improved, energy consumption and risks are reduced, and good universality and engineering application value are achieved.

The invention discloses a low-permeability coal rock medium anti-permeability test method which comprises the following steps: preparing a coal rock sample, and putting the sample into a seepage tank; filling the sealing film with water to ensure that the box wall and the bottom plate are attached to the surface of the sample; adding test water, and setting a water inlet and outlet head and a transparent box base inclination angle; starting a water pump to supply water; water flows through the water inlet system and the test box body system through the circulating water supply system; adjusting a water inlet head; water enters the water outlet groove of the test box body system; reading the data of the water outlet flow meter, calculating the permeability coefficient of the sample, and finding the maximum impermeable water head difference of the sample by using a bisection method; analyzing the influence of the invariable water pressure and the soaking effect of water on the permeability resistance of the sample; in addition, sample preparation is repeated, a water inlet head is adjusted at short time intervals, and the influence of short-time water pressure change on the permeability resistance of the sample is analyzed; in addition, sample preparation is repeated, a water inlet head is adjusted at a long time interval, and the influence of long-time changing water pressure and water soaking action change on the permeability resistance of the sample is analyzed; the device can be used for testing the permeability resistance of the coal rock medium.

The application discloses a kind of geotechnical medium parameter test and reinforcement method, contain following steps, step 1: multiple in-situ test holes and geophysical prospecting test lines are laid in slope, foundation or filling site, in-situ test and geophysical prospecting test are carried out, including in-situ borehole shear test, permeability test and pore pressure observation, to obtain the mechanical properties of soil layer, permeability and pore water pressure parameter;Step 2: according to the obtained soil layer parameter, the initial pressure, flow and slurry concentration required for grouting are calculated;Step 3: using grouting equipment, slurry is injected into soil layer, and the deformation of soil layer, pressure change and permeability change are monitored during grouting process;Step 4: according to the real-time monitoring data, adjust the grouting pressure and flow, to ensure the uniformity of grouting and reinforcement effect, compared with traditional empirical grouting method, the application can significantly improve the uniformity of reinforcement and anti-seepage effect, reduce energy consumption and risk, with good universality and engineering application value.

The utility model discloses a drilling fluid percolation test device, and relates to the technical field of percolation test devices. The utility model comprises: a top cover, a valve is arranged on the surface of the top cover, and a filter box is threadedly sleeved on the bottom. When the utility model is in use, after the user pours a certain amount of drilling fluid into the top of the top cover, the valve is unscrewed, and the drilling fluid will pass through the filter cotton and the secondary filter screen in sequence. The filter cotton can detect the percolation speed of the drilling fluid. The user can judge its sealing performance by observing the seepage rate of the drilling fluid. The drilling fluid passing through the secondary filter screen will fall into the interior of the filter box, and the impurities inside will remain on the surface of the secondary filter screen. The user only needs to remove the filter box and take it out through the limit mechanism to judge the impurity content. This method directly performs secondary filtration on the drilling fluid that passes the percolation test, which can avoid the loss of impurities caused by the secondary filtration, improve the accuracy of the experiment, and fully reflect the practicality of the device.

The invention discloses a method for determining the position of a dam-surrounding seepage-proofing line, which comprises the following steps of: 1) drilling, and carrying out a seepage test and underground water level long-term observation in a drill hole; 2) drawing a contour line relative to the top surface of the impervious layer based on the result of the penetration test; based on the long-term observation data of the underground water level, an underground water level equal water level line is drawn; (3) based on the groundwater surface equal water level and the opposite impervious layer top surface contour line, a dam-surrounding seepage-proofing line is preliminarily planned; and (4) determining a dam-surrounding seepage prevention line. According to the method, the drilling coordinates are combined with detailed and comprehensive hydrogeological conditions such as underground water and rock-soil body permeability, and the optimal dam-surrounding seepage prevention line position is determined by comparing two schemes of the initially-planned underground water surface and the relatively-impervious layer top surface, so that the seepage prevention line position is determined on the premise that the dam-surrounding seepage safety is guaranteed. And the anti-seepage route is shortened, the engineering amount of the anti-seepage curtain is reduced, and the construction treatment cost is saved.

The utility model discloses a sealing device for a rock-soil penetration test, and belongs to the technical field of geotechnical engineering test piece testing. Comprising a box bottom structure and a box cover structure, the box bottom structure comprises a box bottom rubber sleeve and a bottom groove plate, and the upper end face of the box bottom rubber sleeve is of an open structure; the bottom groove plate is embedded in the lower end face of the box bottom rubber sleeve and is flush with the lower end face of the box bottom rubber sleeve, and the bottom groove plate is in sealed connection with the seam of the box bottom rubber sleeve. The box cover structure comprises a box cover rubber sleeve and a cover groove plate, the lower end face of the box cover rubber sleeve is of an open structure, the cover groove plate is embedded in the upper end face of the box cover rubber sleeve and is flush with the upper end face of the box cover rubber sleeve, and the joint of the cover groove plate and the box cover rubber sleeve is connected in a sealed mode. The bottom trough plate is provided with a water outlet hole, and the cover trough plate is provided with a water inlet hole; the rock-soil test piece is placed in the box bottom structure, and the box cover structure sleeves the outer sides of the rock-soil test piece and the box bottom structure from top to bottom and is used for sealing the whole rock-soil test piece; according to the utility model, the problems of complex sealing process and large test result error in the existing geotechnical engineering penetration test are solved.

The application discloses a kind of rock fissure low temperature two-phase percolation visual test system and test method, system includes low temperature control system, data acquisition system, high-definition video image acquisition and transmission system, gas transmission system, transparent fissure sample, gas drainage pipe, telescopic stand, parallel light source;The transparent fissure sample is placed on parallel light source in low temperature control box, both ends are equipped with steady flow tank, two gas drainage pipes are respectively installed in the lower end of two end steady flow tank, and pressure sensor for measuring the gas parameters in each gas drainage pipe is arranged in each gas drainage pipe.The low temperature control system of the application keeps the transparent fissure sample and fluid in low temperature state, and different low temperature environments are set during the test to carry out fissure low temperature two-phase percolation test.The application has simple structure and is easy to operate;The displacement of transparent fissure sample can be observed in real time;The displacement law of the sample under low temperature and different flow conditions can be continuously measured and studied.

A grouting test device and method for deep underground rock mass filling fissures provided by the present invention. The device includes a rock specimen, a heat shrinkage module, a vibration module, an operation table, a high-temperature module, an electric control module, and a base; a rock fissure is inclined on the rock specimen, and an upper pore and a lower pore communicating with the rock fissure are respectively arranged on the top and bottom of the rock specimen. The heat shrinkage module includes a heat shrinkable tube that surrounds the rock specimen. The vibration module is arranged below the rock specimen and installed in the operation table, and the operation table is installed on the base. The high-temperature module is located on the operation table and covers the outside of the rock specimen. The electric control module is electrically connected to the heat shrinkage module, the vibration module, and the high-temperature module respectively. The present invention can simulate the deep underground high-temperature environment, and then through the constant head permeability test under different disturbances, accurately test the anti-seepage performance and seismic performance of the deep underground rock mass filling fissures during grouting reinforcement.

The invention relates to a temperature-controllable permeation soil column model test device capable of simulating different consolidation stresses, which comprises a peripheral sealing device, a consolidation permeation device is arranged in the peripheral sealing device, and a thermal insulation liquid is filled between the lower part of the consolidation permeation device and the interior of the peripheral sealing device. A transition liquid storage tank communicated with the consolidation and permeation device is arranged on the side surface in the peripheral sealing device, and a pressurizing device communicated with the consolidation and permeation device and the transition liquid storage tank is arranged on the outer side of the peripheral sealing device. Through arrangement of the peripheral sealing device and the heat preservation liquid, constant-temperature adjustment of the temperature in the test process is achieved, the test is not affected by external temperature factors, and the test error and the test cost are reduced; the test device is combined with the consolidation device and the permeation device, and the sample can be subjected to a permeation test without moving after being consolidated in the test device, so that the artificial disturbance is avoided, and the test error is reduced.

This application provides an in-situ one-dimensional soil column permeability test device and method under rainfall conditions, relating to the field of soil permeability testing. The in-situ one-dimensional soil column permeability test device under rainfall conditions includes: a simulated soil mass and a rainfall simulation system. The simulated soil mass includes a test soil pile, a simulated soil column, and a moisture content sensor. The rainfall simulation system includes a stabilizing support, a simulated rain box, and an adjustment mechanism. The stabilizing support is inserted and fixed within the test soil pile and spans the test trench. The adjustment mechanism is located at the upper end of the stabilizing support. This in-situ one-dimensional soil column permeability test device under rainfall conditions allows for direct observation of permeability rate and permeability deformation, and can obtain the moisture content time-history curve during the test process to study the seepage field changes of the simulated soil column. It also effectively controls the distance between the simulated rain box and the top of the simulated soil column, reducing the impact of rainfall on the boundary of the simulated soil column.

This invention discloses a system and method for in-situ high-temperature pyrolysis and permeability testing of rocks based on CT scanning, belonging to the field of clean mining technology for underground resources. The testing system includes a high-precision pressure loading mechanism, an electromagnetic heating and temperature control mechanism, and a permeability testing mechanism. The high-precision pressure loading mechanism forms an upper and lower clamp for the specimen, without affecting the CT scanning path. The permeability testing mechanism includes a movable confining wall, which can continue high-temperature in-situ permeability testing after the real-time CT scan is completed. This invention can simultaneously realize four functions: in-situ stress simulation, high-temperature pyrolysis, real-time CT scanning, and permeability testing. It can complete multi-parameter testing without transferring the specimen, avoiding data deviations caused by structural changes during specimen transfer.

The invention discloses a parameter acquisition method and system for a reactive seepage dissolution and precipitation process and a medium. Relates to the technical field of geological storage. Carrying out a reactive seepage test, and collecting image data and seepage pressure data in real time; preprocessing the image data, and analyzing and calculating the variation of precipitation pixel points and the precipitation amount in the reactive seepage process; inputting the variation of the precipitation pixel points and the seepage pressure data into a constructed precipitation parameter relation model to obtain precipitation process parameters; according to the scheme, a carbon dioxide geological storage project is guided based on the precipitation process parameters, and real-time calculation of the porosity and the permeability in the reactive seepage dissolution precipitation process is realized based on a constructed precipitation parameter relation model through real-time image acquisition and real-time pressure monitoring of a reactive seepage test; the method has the advantages of being easy to operate, few in process, low in cost, high in precision and good in timeliness.

The utility model discloses a constant water pressure compact structure penetration tester for in-situ test of soil body permeability, which relates to the technical field of geotechnical test, and comprises a steel cylinder with tough feet and a comprehensive action frame for fixing the steel cylinder with tough feet, and a plurality of acrylic cylinders are arranged at the upper end of the steel cylinder with tough feet; a top cover is arranged at the upper end of each acrylic cylinder, rubber sleeves are arranged at butt joints between the steel cylinder with the tough feet and the acrylic cylinders and between the acrylic cylinders, and stainless steel hose clamp rings are arranged on the outer surfaces of the rubber sleeves. The upper portion of the acrylic cylinder is fixed to one side of the comprehensive action frame through a flexible rope. A horizontal outward-extending plate is arranged on the outer side wall of the steel cylinder with the tough foot. According to the utility model, the structure compactness of the soil in-situ permeability tester is improved; the constant water pressure of the soil in-situ permeability tester is ensured; the free disassembly, assembly, carrying and repeated use of the soil in-situ permeability tester are realized.

The utility model relates to the technical field of improved saline soil penetration test, in particular to an improved saline soil penetration test device which comprises a penetration cylinder and a limiting ring arranged at the bottom of the inner circumferential surface of the penetration cylinder, the penetration cylinder comprises a plurality of cylinder bodies, and a blocking part is arranged between every two adjacent cylinder bodies; the blocking part comprises an annular accommodating chamber and an elastic inner wall, the elastic inner wall is an inner ring wall of the annular accommodating chamber, and the elastic inner wall is flush with the inner peripheral wall of the permeation cylinder; each blocking part is correspondingly provided with a pressurizing part, fluid is contained in a containing cavity in the pressurizing part and the annular containing chamber, and the containing cavity is communicated with the annular containing chamber; a piston is arranged in the containing cavity, the piston is pushed to move forwards, fluid in the containing cavity can enter the annular containing chamber, and at least part of the elastic inner wall protrudes out of the inner circumferential wall of the permeation cylinder. According to the utility model, the side wall leakage in the penetration test process can be effectively prevented.

The utility model discloses a saline soil on-site penetration test device, which belongs to the technical field of geotechnical investigation and comprises a water supply tank, a connecting pipeline, a sampling pipe, a water leakage prevention device and a measuring cup, the connecting pipeline comprises a first hose connected with the water supply tank, a water pipe connected with the first hose, a second hose connected with an outlet of the water pipe and an elbow connected with the second hose; a tee joint is vertically arranged at the upper end of the water pipe, a horizontal inlet of the tee joint is connected with the first hose through a branch, and a lower outlet of the tee joint is connected with the water pipe; an overflow hole is formed in the opposite side of the tee-joint horizontal inlet; the sampling pipe is arranged in undisturbed soil in a penetrating manner, and water strainers are arranged in two ends of the sampling pipe; and a measuring cup is arranged below the water outlet pipe of the anti-leakage device arranged at the outlet of the sampling pipe. The device is simple in operation process and relatively low in test cost, can overcome data distortion caused by soil sample disturbance in an indoor penetration test, reduces the influence of the outside on a saline soil sample to the greatest extent, and ensures the original state of the soil sample.

The invention relates to a method suitable for calculating the permeability coefficient of high-viscosity tailings, and belongs to the technical field of mining methods. According to the technical scheme, the method comprises the following steps: collecting tailings with different high-viscosity particle contents, and preparing into a penetration test standard sample; respectively applying different consolidation pressures, after each stage of consolidation is completed, carrying out a permeability test on the sample, determining the permeability coefficient of the sample, and repeating the steps until the consolidation pressure of the last stage is reached; obtaining permeability coefficients of the tailings with different high-viscosity particle contents and porosities, then reversely deducing key coefficients in an average pore diameter calculation formula, obtaining a calculation formula of the average pore diameter of the multi-viscosity particle tailings, and finally obtaining a calculation formula of the permeability coefficients of the multi-viscosity particle tailings. The method has the advantages that the method for calculating the average pore diameter of the high-viscosity tailings is determined for the high-viscosity tailings with the clay content exceeding 25%, then the method for calculating the permeability coefficient of the high-viscosity tailings is obtained, the result of the calculated permeability coefficient of the high-viscosity tailings is more accurate, and data support can be provided for stable operation of a tailings pond.

This invention relates to an undisturbed soil permeability testing device based on a thin-walled sampling barrel, comprising: a base, a top cover, a thin-walled sampling barrel, and a fixing screw; the base is fixed below the thin-walled sampling barrel, and the outer wall of the base is provided with, from bottom to top, an annular step, a sealing groove, and a trapezoidal corner, with the radial dimensions decreasing sequentially; the outer wall of the top cover is provided with, from top to bottom, an annular step, a sealing groove, and a trapezoidal corner, with the radial dimensions decreasing sequentially; the thin-walled sampling barrel is a hollow cylindrical body with a rolled edge at the lower end and a sampling cutting edge at the upper end; the lower end of the thin-walled sampling barrel abuts against the annular step of the base, and the upper end abuts against the top cover; a second O-ring is provided in the sealing groove of the base, and a first O-ring is provided in the sealing groove of the top cover. Compared with the prior art, this invention minimizes soil sample disturbance and ensures data authenticity; it has excellent structural sealing performance, high and uniform saturation efficiency; and it has high testing efficiency and strong versatility.

The invention discloses multifunctional test equipment for a permeability test of a low-permeability coal rock medium. The multifunctional test equipment comprises a water inlet system, a test box body system, a water outlet system and a circulating water system which are arranged on a steel frame support, the water inlet system is connected with the test box body system, the water inlet system is used for supplying pressure-adjustable water into the test box body system so as to measure the permeability resistance of a coal sample, and the water outlet system is connected with the test box body system. The water outlet pressure of the water outlet system is adjustable so as to measure the permeability characteristics of the coal sample under different permeability pressure conditions, and the water circulating system is arranged between the water outlet system and the water inlet system; the method has the advantages that the anti-permeability strength, permeability coefficient and permeability of the low-permeability coal rock under the conditions of water head change, medium change, soaking time of the coal rock in water and the like can be quickly and accurately analyzed, and technical support is provided for scientific and safe coal mine construction and coal mining.

The invention discloses a method for evaluating equivalent mechanics and permeability parameters of a soil-rock mixture. The method comprises the following key steps: collecting physical parameters such as density and water content in a multi-source manner; the mechanical properties of soil and stone are tested in a controllable environment; measuring the permeability through a customized penetration test; the shape factor correction Halpin-Tsai model is used for calculating equivalent parameters; a multiple regression optimization model; and verifying the applicability of the parameter engineering in a finite element closed-loop manner. The innovation point of the method is that multi-source testing and microscopic feature correction are fused, mechanical-permeability parameter collaborative evaluation is realized, and the precision is guaranteed through regression optimization and numerical verification. According to the method, various experimental data and numerical simulation are combined, and the problem that the performance of the earth-rock aggregate is complex and difficult to evaluate is solved.

The application provides a soil body deposition consolidation and bidirectional permeability coefficient testing device, which comprises a soil sample cylinder for layered soil sample loading of tailing materials; a vertical loading system controlled by a measurement and control system, which is used for applying a vertical loading force to the soil sample in the soil sample cylinder, so that the axial force reaches a predetermined value to perform drainage consolidation of the soil sample; a water supply and water head control system; a vertical permeation water collecting and flow measuring device, which is used for receiving the water seeping out of the soil sample cylinder; a horizontal permeation test rotating system, which is used for cutting the soil sample in the soil sample cylinder to measure the horizontal permeability coefficient of the soil sample; and a horizontal permeation water collecting and flow measuring device, which is used for receiving the water seeping out of the soil sample in the horizontal permeation test rotating system. The application can realize one-dimensional deposition consolidation test of soil in the soil sample cylinder, realize simulation test of the deposition consolidation process of soil under the conditions of lateral stress state and different overburden loads, and simultaneously perform vertical and horizontal permeation tests, so as to provide more accurate parameters for stability analysis of tailing dams.

The invention discloses a high-water-content flow-state muddy water head penetration test device, and belongs to the technical field of penetration tests, the high-water-content flow-state muddy water head penetration test device comprises a base, a penetration container, a variable water head pipe and a water tank are respectively fixed on the base through supports, and a first water inlet pipe is connected between the water tank and the penetration container; a second water inlet pipe is connected between the variable water head pipe and the first water inlet pipe, a micro booster pump and a first electromagnetic valve are mounted on the first water inlet pipe, a second electromagnetic valve is mounted on the second water inlet pipe, a bottom layer water permeable structure is arranged at the bottom of the permeation container, and a pressurization fixing mechanism is placed on the base. The permeation container is provided with a layered exhaust mechanism; a reverse seepage water supply mode is adopted, a lifting effect on high-flowability mud particles can be formed, meanwhile, a variable head measurement system is matched, it can be ensured that the structure of a soil sample is complete in the whole test period, and a foundation is laid for accurate measurement of the permeability coefficient.

The utility model relates to composite stratum slurry shield slurry permeation film forming test equipment which comprises a permeation cylinder which is vertically arranged, the interior of the permeation cylinder can be seen, and a filtering layer, a soil sample layer prepared from actual stratum soil and a slurry cavity for grouting are sequentially arranged in the permeation cylinder from bottom to top. The top of the permeation cylinder is detachably connected with an upper cover in a sealing manner, the upper cover is provided with an air inlet hole which can be communicated with the interior of the permeation cylinder, the bottom of the permeation cylinder is connected with a lower cover in a sealing manner, and the lower cover is provided with a water inlet hole and a liquid outlet hole which can be communicated with the interior of the permeation cylinder; valves for controlling the holes to be opened and closed are arranged at the air inlet hole, the water inlet hole and the liquid outlet hole; the air pressure device is used for conveying compressed air into the permeation cylinder so as to assist in completing a slurry permeation test, and is communicated with the air inlet hole through an air inlet pipe; and the water supply device is used for injecting water into the permeation cylinder to saturate the soil sample layer so as to assist in completing the constant head test.

The invention discloses a soil permeability test device and method under variable stress conditions, including a base, a soil sample, a sample chamber, a water inlet device, a water outlet device, an electronic displacement meter, a lateral loading hydraulic cylinder, a vertical loading hydraulic cylinder, and a computer are arranged on the base. The soil sample is in the shape of a square column and is arranged in the central compartment of the sample chamber. The water inlet device is used to provide permeation water pressure to the soil sample. The water storage device is used to collect test wastewater and monitor the seepage during the test. The lateral loading hydraulic cylinder applies a horizontal load to the side of the soil sample through a side pressure plate, and the vertical loading hydraulic cylinder applies a vertical load to the top surface of the soil sample through a water inlet trough. The computer is respectively connected to the lateral loading hydraulic cylinder and the vertical loading hydraulic cylinder to control the size of the output load. The invention can simulate the actual stress state of the sample during the test, and can change the stress state of one or more surfaces of the sample as needed, and accurately obtain the variation law of the permeability coefficient of the soil during the stress increase and decrease process.