A temperature-controlled permeable soil column model test device for simulating different consolidation stresses

Abstract

The present application relates to a temperature-controlled permeable soil column model test device for simulating different consolidation stresses, comprising a peripheral sealed device, a consolidation permeation device is arranged inside the device, a thermal insulation liquid is filled between the lower part of the consolidation permeation device and the inside of the peripheral sealed device, a transition liquid storage tank connected to the consolidation permeation device is arranged on the side of the inside of the peripheral sealed device, and a pressurizing device connected to the consolidation permeation device and the transition liquid storage tank is arranged on the outside of the peripheral sealed device. The present invention realizes constant temperature regulation during the test process through the arrangement of the peripheral sealed device and the thermal insulation liquid, the test is not affected by external temperature factors, and the test error and test cost are reduced; the test device combines the consolidation device and the permeation device, and the sample can be subjected to the permeation test without moving after being consolidated in the test device, thus avoiding artificial disturbance and reducing the test error.

Description

Technical Field

[0001] The present application relates to the technical field of geotechnical testing, and in particular to a temperature-controllable permeable soil column model testing device for simulating different consolidation stresses. Background Art

[0002] During the construction of foundation engineering, the foundation or roadbed often has large settlement. In order to study and control the settlement of the foundation or roadbed, it is necessary to use a soil column test device to test the consolidation and permeability characteristics of the soil at different temperatures.

[0003] Conventional soil column test devices include two independent consolidation devices and infiltration devices. The soil sample is consolidated in the consolidation device and then transferred to the infiltration device for infiltration test, which is very inconvenient. In addition, during the sample transfer process, it is inevitable that the sample will be artificially disturbed, affecting the accuracy of the test. The infiltration device usually does not include a constant temperature structure. When the laboratory cannot meet the constant temperature conditions, the seepage process in the infiltration device will be affected, and the obtained permeability coefficient will have errors. Summary of the invention

[0004] Based on this, it is necessary to provide a temperature-controlled permeable soil column model test device that simulates different consolidation stresses to overcome the defects of existing soil column test devices, such as large disturbance to the specimen and inaccurate test results.

[0005] A temperature-controllable permeable soil column model test device for simulating different consolidation stresses, comprising an outer sealed device, a consolidation permeation device is arranged inside the outer sealed device, a lower part of the consolidation permeation device and the interior of the outer sealed device are filled with insulation liquid, a transition liquid storage tank connected to the consolidation permeation device is arranged on the side of the interior of the outer sealed device, the transition liquid storage tank is connected to the liquid chamber of the consolidation permeation device through a first connecting pipe, and is connected to the exhaust hole of the consolidation permeation device through a second connecting pipe, a pressurizing device connected to the consolidation permeation device and the transition liquid storage tank is arranged on the outside of the outer sealed device, the pressurizing device comprises an air pump, the air pump is connected to the liquid inlet of the consolidation permeation device through a third connecting pipe, and is connected to the transition liquid storage tank through a fourth connecting pipe.

[0006] As a preferred embodiment of the temperature-controlled permeable soil column model test device for simulating different consolidation stresses in the present invention, the peripheral sealing device includes a box body, the box body has an upward opening, a detachably connected top plate is provided at the opening, and a heating wire is provided at the connection between the inner wall of the box body and the insulation liquid.

[0007] As a preferred embodiment of the temperature-controlled permeable soil column model test device for simulating different consolidation stresses in the present invention, the consolidation permeation device includes a consolidation permeation barrel and a pressurized consolidation device, a removable top plate is provided on the top of the consolidation permeation barrel, the removable top plate is provided with a reserved hole, the interior of the consolidation permeation barrel includes a consolidation permeation chamber and a liquid chamber from bottom to top, the consolidation permeation chamber is filled with a sample, one end of the pressurized consolidation device is in contact with the sample, and the other end thereof passes through the removable top plate and is connected to a peripheral sealing device.

[0008] As a preferred embodiment of the temperature-controlled permeable soil column model test device for simulating different consolidation stresses in the present invention, upper permeable stones and lower permeable stones are respectively provided on the upper and lower sides of the sample, and an exhaust baffle and lateral permeable stones are sequentially provided between the sample and the inner wall of the consolidation permeation barrel from the inside to the outside, and an exhaust hole is provided at the lower part of the consolidation permeation barrel, and a drainage hole is provided at the bottom.

[0009] As a preferred embodiment of the temperature-controlled permeable soil column model test device for simulating different consolidation stresses in the present invention, a detachable sealed cover is provided in the liquid chamber, which includes a pair of crescent-shaped plates, and a vertical pull ring and a telescopic pull ring are provided on the crescent-shaped plates.

[0010] As a preferred embodiment of the temperature-controlled permeable soil column model test device for simulating different consolidation stresses in the present invention, the pressurized consolidation device includes a telescopic rod, a porous pressure panel and a hydraulic device. The telescopic rod is hollow, one end of which is provided with a liquid outlet, and the other end of which is provided with a liquid inlet. The end provided with the liquid outlet passes through a detachable top plate and a sealing cover plate in sequence and is connected to the porous pressure panel. The hydraulic device is arranged at the other end of the telescopic rod for driving the telescopic rod, and is connected to a data acquisition system.

[0011] As a preferred embodiment of the temperature-controllable permeable soil column model test device for simulating different consolidation stresses in the present invention, barrier plugs are provided in the first connecting pipe and the second connecting pipe.

[0012] As a preferred embodiment of the temperature-controlled permeable soil column model test device for simulating different consolidation stresses in the present invention, the third connecting pipe and the fourth connecting pipe are provided with a barometer and a valve connected thereto near the air pump end, and the third connecting pipe is provided with a liquid injection valve connected thereto near the liquid inlet end.

[0013] As a preferred embodiment of the temperature-controllable permeable soil column model test device for simulating different consolidation stresses in the present invention, the third connecting pipe is inclined downward near the liquid inlet end.

[0014] As a preferred embodiment of the temperature-controlled permeable soil column model test device for simulating different consolidation stresses in the present invention, it also includes a data acquisition component, which includes an axial displacement sensor and a thermometer. The axial displacement sensor is connected to the consolidation permeation device, one end of the axial displacement sensor passes through a detachable top plate, a sealed cover plate and a porous pressure panel and is connected to the upper permeable stone, the thermometer is connected to the inner wall of the peripheral sealed device, and the axial displacement sensor and the thermometer are connected to the data acquisition system.

[0015] Beneficial effects of the present invention:

[0016] 1. The present invention realizes constant temperature regulation during the test by arranging the peripheral sealing device and the heat preservation liquid. The test is not affected by external temperature factors, thereby reducing the test error and test cost.

[0017] 2. The test device in the present invention combines a consolidation device and a penetration device. After the sample is consolidated in the test device, the penetration test can be carried out without moving, thereby avoiding human disturbance and reducing test errors.

[0018] 3. The present invention can quickly and completely discharge the gas in the sample before the permeability test through the arrangement of the pressurizing component and the transition liquid storage tank, without manual intervention, and can adjust the overburden pressure, thereby ensuring the uniformity of the test during the variable head permeability test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the structure of the test device in the embodiment of the present application;

[0021] Figure 2 A top view of a consolidation infiltration device in an embodiment of the present application;

[0022] Figure 3 This is a schematic diagram of the structure of the consolidation infiltration barrel in the embodiment of the present application;

[0023] Description of reference numerals:

[0024] 1. Insulation liquid;

[0025] 2. Transition liquid storage tank; 201. First connecting pipe; 202. Second connecting pipe; 203. Blocking plug;

[0026] 3. Box body; 301. Top plate; 302. Heating wire;

[0027] 4. Consolidation infiltration barrel; 401. Removable top plate; 402. Sample; 403. Upper permeable stone; 404. Lower permeable stone; 405. Exhaust baffle; 406. Lateral permeable stone; 407. Exhaust hole; 408. Drain hole;

[0028] 5. Pressurized consolidation device; 501. Telescopic rod; 502. Multi-porous pressure panel; 503. Hydraulic device; 504. Liquid inlet;

[0029] 6. Crescent-shaped plate; 601. Vertical pull ring; 602. Telescopic pull ring;

[0030] 7. Air pump; 701. Third connecting pipe; 702. Fourth connecting pipe; 703. Barometer; 704. Valve; 705. Liquid injection valve;

[0031] 8. Axial displacement sensor;

[0032] 9. Thermometer. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0039] Example 1

[0040] This embodiment provides a temperature-controlled permeable soil column model test device for simulating different consolidation stresses. Figure 1 As shown, it includes a peripheral sealed device for providing a closed environment, a consolidation infiltration device for conducting a consolidation infiltration test on the soil is arranged inside the peripheral sealed device, and an insulation liquid 1 is filled between the lower part of the consolidation infiltration device and the inside of the peripheral sealed device, which is used to stabilize the temperature inside the device at a certain temperature, a transition liquid storage tank 2 connected to the consolidation infiltration device is arranged on the side of the inside of the peripheral sealed device, and a pressurizing device connected to the consolidation infiltration device and the transition liquid storage tank 2 is arranged on the outside of the peripheral sealed device, and the transition liquid storage tank 2 and the pressurizing device are used to realize the infiltration test under different head heights.

[0041] In this embodiment, the peripheral sealing device includes a box body 3, which has an upward opening. A detachable top plate 301 is provided at the opening. The top plate 301 can be removed during the test preparation process for preparation work, and the top plate 301 is put back during the test to ensure that a closed environment is formed in the device. A heating wire 302 is provided at the connection between the inner wall of the box body 3 and the insulation liquid 1, which is connected to an external heating device. By heating the insulation liquid 1, the temperature inside the entire device is maintained at a specified temperature.

[0042] In this embodiment, the insulation liquid 1 is oil, and other liquids with good thermal conductivity and slow evaporation rate can also be used. The top of the consolidation and penetration barrel 4 is provided with a detachable top plate 401, which is fixed to the side wall of the soil column by fixing bolts to form a closed space inside. The detachable top plate 401 is provided with reserved holes for other components to pass through. The inside of the consolidation and penetration barrel 4 includes a consolidation and penetration chamber and a liquid chamber from bottom to top. The consolidation and penetration chamber is filled with a sample 402. One end of the pressurized consolidation device 5 is in contact with the sample 402, and the other end thereof passes through the detachable top plate 401 and is connected to the peripheral closed device.

[0043] In this embodiment, an upper permeable stone 403 and a lower permeable stone 404 are respectively provided on the upper and lower sides of the sample 402 to block the flow of other substances in the sample 402 and only allow liquid to flow in or out. An annular exhaust baffle 405 and a lateral permeable stone 406 are sequentially provided from the inside to the outside between the sample 402 and the inner wall of the consolidation penetration barrel 4. A plurality of exhaust holes 407 are provided at the lower part of the consolidation penetration barrel 4. The exhaust baffle 405, the lateral permeable stone 406 and the exhaust holes 407 cooperate with each other to facilitate the discharge of bubbles in the sample 402. A drainage hole 408 is provided at the bottom of the consolidation penetration barrel 4, and is connected to the outside through a pipeline for solution collection. A valve 704 is provided on it, and whether to close the valve 704 is selected according to test needs.

[0044] like Figure 3 As shown, the consolidation permeation barrel 4 is a semi-solid structure, and the outer wall and the inner wall are both installed with an annular exhaust baffle 405, and the rest of the position is solid material, and the material is a material with good thermal conductivity but high temperature resistance, so as to facilitate the temperature transfer. The exhaust baffle 405 is provided with a push-pull rod on the top, and the structure is used to adjust the position of the exhaust baffle 405. When it is necessary to eliminate the bubbles in the sample 402, the exhaust baffle 405 is moved upward by the push-pull rod so that the lateral permeable stone 406 connected to the lower side just fits into the exhaust hole 407. At this time, the solutions in the transition liquid storage tank 2 and the sample 402 can be connected to each other. If the lateral baffle is not used, the two are not connected to each other.

[0045] In this embodiment, a removable sealed cover is provided in the liquid chamber. The sealed cover is in a circular ring shape as a whole and is sleeved with the pressurized consolidation device 5. It includes a pair of crescent-shaped plates 6. The inner side of the top of the crescent-shaped plate 6 is provided with a vertical pull ring 601 for controlling its vertical movement. One end of the vertical pull ring 601 is fixedly connected to the crescent-shaped plate 6, and the other end thereof extends to the outside through the reserved hole on the removable top plate 401; a telescopic pull ring 602 for controlling its tilt is provided on the outer side of its bottom, one end of which is fixedly connected to the crescent-shaped plate 6, and the other end thereof extends to the outside through the consolidation infiltration barrel 4. When it is not necessary for liquid to enter the sample 402, the sealed cover is lowered to fit the top surface of the porous pressure panel 502 through the vertical pull ring 601, so that its liquid-permeable holes are impermeable to water; when liquid is required to enter the sample 402, the sealed cover is lifted to an appropriate height and kept fixed, and the two crescent-shaped plates 6 are lifted to a certain angle respectively through the telescopic pull ring 602, so that the liquid can flow into the sample 402 through the liquid-permeable holes on the porous pressure panel 502.

[0046] In this embodiment, the contact point between the vertical pull ring 601 and the detachable top plate 401 and the intersection between the telescopic pull ring 602 and the consolidation permeation barrel 4 need to be sealed by a rubber ring to prevent leakage.

[0047] The pressurized consolidation device 5 includes a telescopic rod 501, a porous pressure panel 502 and a hydraulic device 503. The telescopic rod 501 is hollow, and has a liquid outlet at one end and a liquid inlet 504 at the other end. The liquid outlet end passes through the removable top plate 401 and the sealing cover plate in sequence and is connected to the porous pressure panel 502. The porous pressure panel 502 is provided with a liquid permeable hole for the solution to flow into the consolidation permeation chamber, and the solution can flow into the liquid chamber through the liquid inlet 504. The hydraulic device 503 is arranged at the other end of the telescopic rod 501 and is used to drive the telescopic rod 501 to move vertically. It is connected to the data acquisition system, and the data acquisition system controls the pressurized consolidation device 5 to apply different sizes of vertical consolidation stress to the sample 402.

[0048] In this embodiment, the transition liquid reservoir 2 is arranged above the insulation liquid 1 and connected to the inner wall of the box body 3. There are multiple transition liquid reservoirs 2. The transition liquid reservoir 2 is connected to the liquid chamber through the first connecting pipe 201 and is connected to the exhaust hole 407 through the second connecting pipe 202. The first connecting pipe 201 and the second connecting pipe 202 are provided with a blocking plug 203 for controlling the inflow and outflow of liquid. When the sealed cover needs to be lifted, since the hydraulic pressure in the liquid chamber is large, the blocking plug 203 needs to be opened to transition the liquid in the liquid chamber to the transition liquid reservoir 2, so that the crescent-shaped plate 6 can be moved through the vertical pull ring 601. At the same time, the bubbles in the sample 402 are discharged through the second connecting pipe 202 by heating the insulation liquid 1.

[0049] In this embodiment, the transition liquid reservoir 2 should contain the same solution as the sample 402 when it is saturated, and then exhaust gas is performed to ensure that the transition liquid reservoir 2 and the sample 402 are connected to each other, and only the bubbles are discharged from the sample 402.

[0050] In this embodiment, the pressurizing device includes an air pump 7, which is used to simulate the permeation test under different water head heights by applying air pressure. The air pump 7 is connected to the liquid inlet 504 through the third connecting pipe 701, and is connected to the transition liquid storage tank 2 through the fourth connecting pipe 702. The third connecting pipe 701 and the fourth connecting pipe 702 are provided with a barometer 703 and a valve 704 connected thereto near the end of the air pump 7, and the third connecting pipe 701 is provided with a liquid injection valve 705 connected thereto near the end of the liquid inlet 504. The air pump 7 is connected to the liquid inlet 504 through the third connecting pipe 701 and controls the transmission of gas through the valve 704. During this process, the internal pressure degree is observed through the barometer 703. The liquid injection valve 705 is used to inject liquid into the liquid chamber. The height of the connection end of the third connecting pipe 701 and the air pump 7 is greater than the height of the connection end thereof with the liquid inlet 504, and the third connecting pipe 701 is tilted downward near the end of the liquid inlet 504 to prevent liquid backflow.

[0051] In this embodiment, a data acquisition component is also included, which includes an axial displacement sensor 8 and a thermometer 9. The axial displacement sensor 8 is connected to the consolidation penetration device. One end of the axial displacement sensor 8 passes through the removable top plate 401, the sealed cover plate and the porous pressure panel 502 and is connected to the upper permeable stone 403 to observe the vertical deformation of the sample 402 during the test. The two sides are respectively provided with a sealing ring for judging the uniformity of the deformation. The connection between the axial displacement sensor 8 and the removable top plate 401, the sealed cover plate and the porous pressure panel 502 is provided with a sealing ring. The thermometer 9 is connected to the inner wall of the peripheral sealing device, and the axial displacement sensor 8 and the thermometer 9 are connected to the data acquisition system.

[0052] Example 2

[0053] This embodiment provides a method for using a temperature-controlled permeable soil column model test device for simulating different consolidation stresses, which includes the following steps:

[0054] Preparation of samples: prepare the required sample 402, open the removable top plate 401, place filter paper on the lower permeable stone 404 to prevent soil sample particles from being washed away and blocking the drainage hole 408, weigh the soil sample of corresponding mass, place filter paper on the soil sample, then place the permeable stone 403, install the pressurized consolidation device 5, and cover the removable top plate 401.

[0055] Application of different axial pressures: The telescopic rod 501 moves up and down through the data acquisition system to control the telescopic rod 501, and different vertical pressures are applied to the sample 402 in combination with the hydraulic device 503 to consolidate it. At this time, the exhaust hole 407 and the push-pull rod should be in a closed state to ensure that the sample 402 cannot drain and exhaust water laterally. If it is consolidation and drainage, open the lower end drainage hole 408; if it is consolidation without drainage, close the lower end drainage hole 408. This process needs to be combined with the axial displacement sensor 9 to measure the height change of the test sample 402 to determine the volume of water / hole.

[0056] Preparation of saturated permeability sample: A saturated sample 402 is required before the formal test period. During this process, it is only necessary to inject the solution into the solution chamber from the liquid inlet 504. At this time, the crescent-shaped plate 6 should be tilted at an angle through the vertical pull ring 601 and the telescopic pull ring 602 to ensure that the liquid enters the sample 402 through the porous pressure panel 502 and the upper permeable stone 403.

[0057] Exhaust bubbles: After saturation, when exhausting, first ensure that the gas cannot be discharged from the upper part of the sample 402, that is, put the sealed cover plate on the porous pressure panel 502, that is, close the porous pressure panel. At this time, it is necessary to control the position of the crescent-shaped plate 6 through the telescopic pull ring 602 and the vertical pull ring 601, so that it can be slowly moved to the top surface of the porous pressure panel 502. At this time, since the liquid chamber is saturated and the pressure is high, it is not easy to operate. The barrier plug 203 in the liquid chamber and the transition liquid storage tank 2 can be opened to connect the two, generate a pressure difference, and facilitate operation. Afterwards, lift the push-pull rod to move the exhaust baffle 405 upward, so that the sample 402 is connected to the exhaust hole 407 through the lateral permeable stone 406. At the same time, the blocking plug 203 connecting the transition liquid reservoir 2 and the exhaust hole 407 is opened, and then the insulation liquid 1 is heated by the heating wire 302 to slowly discharge the bubbles from the sample 402. At this time, bubbles are generated in the transition liquid reservoir 2. The bubbles are considered to be completely discharged until no bubbles are generated. At the same time, the temperature should be raised slowly, and the temperature change should not be too large so as not to affect the test results.

[0058] Temperature gradient setting: heating by the insulation liquid 1 and real-time monitoring by the thermometer 9, through the layout of the consolidation infiltration barrel, the temperature of the infiltration liquid can be consistent with the simulated temperature, so that the permeability coefficient under different temperature gradients can be studied.

[0059] Simulating the penetration test under different water heads: atmospheric pressure is applied to the transition liquid storage tank 2 and the liquid chamber through the air pump 7, the barometer 703, the valve 704, the third connecting pipe 701 and the fourth connecting pipe 702, so that water heads at different heights can be simulated without actually conducting a drop penetration test, so as to conduct penetration tests under different water heads.

[0060] Consolidation drainage permeability test (saturation) under different axial pressures: The data acquisition system controls the air pump 7 to apply different air pressures to the sample 402 to achieve the corresponding consolidation pressure. During the consolidation process, the drainage hole 408 at the lower end is opened for drainage. Loading is performed step by step according to the specification. After consolidation is completed, the air pump 7 can be controlled to reach the axial pressure required for the test, the liquid inlet 504 is opened, and the penetration liquid is added to perform the permeation test.

[0061] Consolidation undrained permeability test (saturated) under different axial pressures: The data acquisition system controls the air pump 7 to apply different air pressures to the sample 402 to achieve the corresponding consolidation pressure. During the consolidation process, the drainage hole 408 at the lower end is closed, and the upper sealed cover plate is pressed against the top surface of the porous pressure panel 502 to prevent the discharge of water during the consolidation process. The gas in the sample 402 is discharged through the lateral permeable stone 406 to achieve the effect of exhausting and undraining, and the consolidation undrained test is completed. Load step by step according to the specifications. After the consolidation is completed, the air pump 7 can be controlled to reach the axial pressure required for the test, the liquid inlet 504 is opened, and the penetration liquid is added to conduct the permeation test.

[0062] Permeation test under different temperature gradients: by controlling the heating of the insulation liquid 1 and combining with the thermometer 9 for real-time monitoring, when the temperature reaches the set temperature, insulation is performed, and the permeation test under different temperature gradients can be performed.

[0063] Mutual verification of saturated permeability coefficient and consolidation (in-situ verification): During the consolidation process, the axial pressure and displacement of the sample 402 can be obtained, and the mass of the seepage liquid can be obtained during the drainage test, thereby calculating the permeability coefficient of the soil sample in the consolidation test. At the same time, the permeability coefficient in the permeability test is calculated according to the standard formula during the permeability test. Since the soil sample is not disturbed, the permeability coefficients obtained in the two tests can be mutually verified in-situ.

[0064] Permeability test under single and composite pollution: This test device can simulate permeability test under different pollution. After the preliminary consolidation test is completed, the water in the transition liquid storage tank 2 is introduced into the liquid chamber by the air pump 7 using the pressure difference to start the preliminary saturation stage of the permeability test. After the soil sample is saturated, the water in the liquid chamber and the transition liquid storage tank 2 is replaced with the polluted liquid required for the test to simulate the permeability test under different pollution. When the condition simulated by the test is single pollution, the same polluted liquid can be placed in multiple liquid chambers; when the condition simulated by the test is composite pollution, the composite polluted liquid can be prepared in advance and then added to the liquid chamber for placement, so as to simulate the composite pollution working condition, or different polluted liquids can be placed in multiple liquid chambers to simulate the permeability test under real-time composite pollution conditions.

[0065] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A temperature-controlled permeable soil column model test device for simulating different consolidation stresses, characterized in that: It comprises a peripheral sealed device, a consolidation infiltration device is arranged inside the peripheral sealed device, a heat preservation liquid is filled between the lower part of the consolidation infiltration device and the inside of the peripheral sealed device, a transition liquid storage tank connected with the consolidation infiltration device is arranged on the side of the inside of the peripheral sealed device, the transition liquid storage tank is connected with the liquid chamber of the consolidation infiltration device through a first connecting pipe, and is connected with the exhaust hole of the consolidation infiltration device through a second connecting pipe, a pressurizing device connected with the consolidation infiltration device and the transition liquid storage tank is arranged outside the peripheral sealed device, the pressurizing device comprises an air pump, the air pump is connected with the liquid inlet of the consolidation infiltration device through a third connecting pipe, and is connected with the transition liquid storage tank through a fourth connecting pipe; The consolidation penetration device comprises a consolidation penetration barrel and a pressurized consolidation device, the top of the consolidation penetration barrel is provided with a detachable top plate, the detachable top plate is provided with a reserved hole, the interior of the consolidation penetration barrel comprises a consolidation penetration chamber and a liquid chamber from bottom to top, the consolidation penetration chamber is filled with a sample, one end of the pressurized consolidation device abuts against the sample, and the other end thereof passes through the detachable top plate and is connected to a peripheral sealing device; The liquid chamber is provided with a detachable sealed cover plate, which includes a pair of crescent-shaped plates, and the crescent-shaped plates are provided with a vertical pull ring and a telescopic pull ring, the vertical pull ring is used to control the vertical movement of the crescent-shaped plate, and the telescopic pull ring is used to control the inclination of the crescent-shaped plate; The pressurized consolidation device includes a telescopic rod, a porous pressure panel and a hydraulic device. The telescopic rod is hollow, and has a liquid outlet at one end and a liquid inlet at the other end. The end with the liquid outlet passes through a removable top plate and a sealing cover plate in sequence and is connected to the porous pressure panel. The hydraulic device is arranged at the other end of the telescopic rod and is used to drive the telescopic rod, and is connected to a data acquisition system.

2. The temperature-controlled permeable soil column model test device for simulating different consolidation stresses according to claim 1 is characterized in that: The peripheral sealing device comprises a box body, the box body has an upward opening, a detachably connected top plate is arranged at the opening, and a heating wire is arranged at the connection between the inner wall of the box body and the heat preservation liquid.

3. The temperature-controlled permeable soil column model test device for simulating different consolidation stresses according to claim 1, characterized in that: An upper permeable stone and a lower permeable stone are respectively arranged on the upper and lower sides of the sample, and an exhaust baffle and a lateral permeable stone are arranged in sequence from the inside to the outside between the sample and the inner wall of the consolidation infiltration barrel. An exhaust hole is arranged at the lower part of the consolidation infiltration barrel, and a drainage hole is arranged at the bottom.

4. The temperature-controlled permeable soil column model test device for simulating different consolidation stresses according to claim 1, characterized in that: The first connecting pipe and the second connecting pipe are provided with blocking plugs.

5. The temperature-controlled permeable soil column model test device for simulating different consolidation stresses according to claim 1, characterized in that: The third connecting pipe and the fourth connecting pipe are provided with a pressure gauge and a valve connected thereto near the air pump end, and the third connecting pipe is provided with a liquid injection valve connected thereto near the liquid inlet end.

6. The temperature-controlled permeable soil column model test device for simulating different consolidation stresses according to claim 5, characterized in that: The third connecting pipe is inclined downward near the liquid inlet end.

7. The temperature-controlled permeable soil column model test device for simulating different consolidation stresses according to claim 1, characterized in that: It also includes a data acquisition component, which includes an axial displacement sensor and a thermometer. The axial displacement sensor is connected to the consolidation penetration device. One end of the axial displacement sensor passes through a detachable top plate, a sealed cover plate and a porous pressure panel and is connected to an upper permeable stone. The thermometer is connected to the inner wall of the peripheral sealed device. The axial displacement sensor and the thermometer are connected to a data acquisition system.

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