23 results about "Percolation test" patented technology

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 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 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.

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 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.

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 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 present application aims at the problem of insufficient accuracy of consolidation calculation of ultra-soft soil under low stress level and difficulty in accurately reflecting its consolidation characteristics, and provides a consolidation calculation method of ultra-soft soil under low stress level. The method firstly determines the functional relationship between the void ratio and the permeability coefficient through the permeability test, then identifies the consolidation boundary point of the transformation of ultra-soft soil to ordinary soft soil through the consolidation test, establishes the segmented function relationship between the void ratio and the effective stress before and after the consolidation boundary point, and further obtains the segmented function relationship between the consolidation coefficient and the effective stress. Through the relevant calculation software or the relevant calculation program, the numerical simulation of the consolidation process of ultra-soft soil under low stress level can be realized by using the segmented function relationship between the consolidation coefficient and the effective stress and considering the change of the consolidation coefficient with the increase of the effective stress. The consolidation calculation method can reflect the consolidation deformation law of ultra-soft soil under low stress level, and can provide theoretical reference for the design and construction of ultra-soft soil foundation reinforcement engineering.

The invention relates to a soil penetration test system and method capable of adjusting a water flow angle and a seepage condition. The soil penetration test system comprises a supporting steel frame, an adjustable turntable structure, a sample chamber and a gravel chamber, t-shaped pipe fittings are fixed to steel frames on the two sides of the supporting steel frame, a water inlet of the T-shaped pipe fitting on the left side of the supporting steel frame is connected with a water supply pipe, and a transverse water outlet and a vertical water outlet are connected with a front branch and a back branch respectively; the adjustable turntable structure is rotationally connected to the middle of the supporting steel frame. The device has the beneficial effects that through the combination of the adjustable turntable structure and the rubber flexible short section, the water flow incident angle can be continuously adjusted within a certain range, the seepage working conditions in different water incoming directions can be simulated in the same device, and the applicability is high; valves are respectively arranged on the front branch and the back branch, so that the front seepage working condition and the back seepage working condition can be quickly switched, and the influence of the front seepage working condition and the back seepage working condition on soil seepage and scouring characteristics can be conveniently researched by the system.

The application discloses a triaxial shearing test clamp and a percolation test device comprising the same. The clamp comprises shearing boxes and limiting mechanisms. The number of the shearing boxes is two, and the shearing boxes are provided with grooves. The grooves of the two shearing boxes form a space for accommodating a rock sample. The limiting mechanisms are arranged in one-to-one correspondence with the shearing boxes. The limiting mechanism comprises a fixing seat, a push rod and a pressing plate. The number of the push rods is at least two. The push rods are in sliding connection with the fixing seat. The pressing plate is connected with the end of the push rod. The fixing seat is in abutment with the side wall of the groove. The pressing plate is in abutment with the rock sample. The two shearing boxes can be moved in a staggered manner. The sliding direction of the push rod is coaxially arranged with the moving direction of the shearing box. Through the extension and retraction of the push rod in the limiting mechanism, the pressing plate and the side wall of the groove can jointly clamp and fix the rock sample. This makes the test clamp be able to adapt to rock samples of different sizes, and also can eliminate the gap between the rock sample and the side wall of the shearing box groove.

The invention discloses a geotechnical test coarse-grained soil constant head permeability test automatic collection device and method, and the device comprises a temperature control water supply module which comprises a temperature control water tank and has the water level monitoring alarm and automatic water supplement functions; the constant head test module comprises a permeation cylinder and a permeation water collecting cylinder which are connected with each other, the permeation cylinder is provided with a grading manometer, a composite permeation assembly and an overflow pipeline, and the permeation water collecting cylinder is provided with a timer; and the data acquisition intelligent final calculation module comprises a touch panel and is linked with functions of temperature control, water level monitoring, automatic water replenishing, timing and on-off of each pipeline, so that full-flow automatic acquisition of test data, permeability coefficient calculation and 20 DEG C standard value conversion are realized. The device and the method thoroughly solve the problems of tedious manual operation, large error and low efficiency of a traditional test, do not need to be attended by a specially-assigned person, are accurate and reliable in data and convenient to operate, meet the development requirements of test standardization, precision and digital intelligence, and are suitable for the indoor coarse-grained soil constant head penetration test of geotechnical engineering.

The application belongs to the technical field of building engineering detection, and particularly relates to a multifunctional geotechnical test device and method, which comprises: a support frame part, including a main frame for placing the test device, the main frame being divided into three parts of upper, middle and lower parts; an upper load applying part, arranged on the top of the support frame part, including a rotating motor and a cross torsion piece for torsion test, and a second square steel connecting block and a downward disc for shear and penetration test; a first static load applying part, arranged on the left side of the middle part of the support frame part; a right side dynamic load applying part, arranged on the right side of the middle part of the support frame part; and a lower load applying part, arranged on the middle part of the support frame part, including upper and lower shear boxes for shear and torsion test, and a penetration water bucket for penetration test. The multifunctional geotechnical test device can solve the problems of the existing conventional test device, such as single function, poor adaptability and difficulty in simultaneously meeting multiple test requirements.

The application provides a device and method for measuring the unidirectional freeze-thaw permeability coefficient of soil bodies in different height ranges, and comprises a water storage pool, a sample cylinder, a top cold plate structure, a bottom cold plate structure, a water supply pipe structure and a variable water head pipe.The water storage pool is located above the sample cylinder, and overflow holes are arranged on the side of the water storage pool to control the water level of the water storage pool.The sample cylinder comprises a plurality of soil sample unit cylinders stacked one above another, and the soil sample unit cylinders are filled with soil samples to be measured.Water injection holes are arranged on the upper part of each soil sample unit cylinder, and a drainage hole is arranged on the lower part of the bottom soil sample unit cylinder.The top cold plate structure is installed on the upper end of the sample cylinder, and the bottom cold plate structure is installed on the lower end of the sample cylinder.The application can measure the permeability coefficient of soil bodies after freeze-thaw, and is more convenient and fast;not only can it realize constant water head permeability test, but also can realize variable water head permeability test, and can measure the permeability coefficient of soil bodies in different height ranges after unidirectional freeze-thaw.

The invention belongs to the technical field of geotechnical engineering, and discloses a penetration test device and method. The closed pressurizing water tank is provided with a pressurizing air inlet and is connected with a liquid level detection piece and a pressure detection piece; the permeameter comprises a bottom permeable stone, a sample, a top permeable stone and a water collecting cover plate, the sample is clamped between the bottom permeable stone and the top permeable stone, the water collecting cover plate is arranged above the top permeable stone, and a communicated first channel is arranged between the closed pressurizing water tank and the permeameter; water in the closed pressurizing water tank can flow to the bottom permeable stone through the first channel, sequentially flows through the bottom permeable stone, the sample, the top permeable stone and the water collecting cover plate and flows out of the water collecting cover plate to realize seepage; and the air source device is connected with the pressurizing air inlet and can inject air into the closed pressurizing water tank for pressurizing. The controllable pressure generated by the air source device replaces a traditional variable water head pipe, the testing efficiency and precision are improved, and the device is more suitable for a scene with limited space.

The invention provides a capillary model-based expansive rock-soil hydraulic characteristic microscopic test and evaluation method. The method comprises the steps of compaction sample preparation, expansive force and permeability coefficient test, average spacing determination, capillary model parameter derivation and the like. The testing and evaluating method comprises the following steps: firstly, preparing compacted samples with different bentonite mixing amounts, preparing a plurality of samples with different dry densities for each bentonite mixing amount, and carrying out an expansion test, a penetration test and pore structure detection on each sample; evaluating the expansive force and the permeability coefficient of the expansive rock soil according to a test result; comprise the relationship between the expansive force and the dry density as well as the bentonite mixing amount, the relationship between the permeability coefficient and the void ratio and the relationship between the expansive force and the average particle spacing; meanwhile, on the basis of a capillary tube model and the measured permeability coefficient, an optimal model parameter Np corresponding to different bentonite mixing amounts is deduced, and a relational expression between the parameter Np and the plasticity index is obtained on the basis of the optimal model parameter Np.

This invention provides an experimental system and method for simulating artificial freezing and impermeability, relating to the field of freezing tests. The experimental system includes a permeability testing device, a low-temperature cold bath device, and a frozen wall monitoring system. The permeability testing device includes a model container and a flow meter, with an outlet at the bottom of the model container. The interior of the model container is filled with a soil sample mixed with a thermochromic solution, the color-changing boundary temperature of which is 0°C. At least one ring of freezing tubes is wound around the side wall of the model container; the number of rings is adjustable, and an electromagnetic exciter is fixed on the freezing tubes. A cryogenic fluid pipeline connects the low-temperature cold bath device and the freezing tubes. The frozen wall monitoring system includes a data processing host, an acoustic emission sensor, and multiple temperature sensors, which are distributed throughout the model container. By combining multiple methods, the morphological characteristics of the artificially frozen wall can be accurately obtained, enabling effective evaluation of the permeability resistance of the frozen wall under different freezing parameters over time.

The utility model discloses a solidified soil forming solidified post -permeation efficiency's detection device relates to engineering construction technical field, including the cylinder, the inner wall fixed support of cylinder, the top of support frame is equipped with the jar body, the inside of jar body is provided with solidified soil body, the inner wall of jar body is equipped with the inflation sleeve for eliminating jar body inner wall gap, the outside of solidified soil body is provided with sealing assembly. The utility model has the advantages of: the protective film is sleeved on the outside of solidified soil body, and the latex film is tightly attached to the sample, prevents the solidified soil particle from falling off, and is as the first waterproof barrier, and the main waterproof function is provided through the silica gel film, and the sealing property is further enhanced, the solidified soil body is placed into the inside of jar body, and the inflation sleeve is filled with air through the inflation port, makes it expand and fits the sample, effectively prevents the side wall leakage, ensures that the water only flows through the sample internal pore in the process of permeation test.

The application discloses a test device for gas permeation, and relates to the technical field of gas permeation test equipment, and aims to solve the problem of how to improve the accuracy of gas permeation test. The test device comprises a shell and a pressure compensation assembly. The shell is suitable for enclosing a test sample into a high-pressure chamber and a low-pressure chamber located on opposite sides of the test sample. The pressure compensation assembly is connected with the high-pressure chamber and is used for increasing the gas pressure in the high-pressure chamber when the pressure difference between the high-pressure chamber and the low-pressure chamber is lower than a preset threshold.