CN218937995U - Novel lateral limit compression test device for simulating true stress state of soil - Google Patents
Novel lateral limit compression test device for simulating true stress state of soil Download PDFInfo
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- CN218937995U CN218937995U CN202222802057.6U CN202222802057U CN218937995U CN 218937995 U CN218937995 U CN 218937995U CN 202222802057 U CN202222802057 U CN 202222802057U CN 218937995 U CN218937995 U CN 218937995U
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Abstract
The utility model discloses a novel lateral limit compression test device for simulating a true stress state of soil, which comprises a test device body, a pressing device, a pressurizable water injection device, an exhaust pipeline, a water pressure monitoring device and a pore pressure monitoring device. The pressurized water injection device simulates the lateral pressure condition of the soil sample in the real soil layer transmitted by the surrounding soil body by injecting water with a certain pressure into the test cavity around the test soil sample, and the water pressure monitoring device obtains the dynamic change condition of the lateral pressure value of the soil sample in real time by taking the water in the test cavity as a medium and dynamically monitoring the change condition of the water pressure. The utility model can make the soil sample in the indoor test better simulate the mechanical deformation characteristic of the undisturbed soil body, thereby providing more reliable soil sample parameters for practical engineering.
Description
Technical Field
The utility model relates to the technical field of geotechnical tests, in particular to a novel lateral limit compression test device for simulating a true stress state of soil.
Background
The traditional lateral limit compression test provides great help for determining the mechanical property of soil and calculating the foundation settlement, but the current test method has certain defects. In the traditional lateral limit compression test, the stress state of the soil sample in the test is different from the stress state of the soil sample in the real soil layer, the initial state of the soil sample is not affected by the lateral pressure transmitted by the surrounding soil body and is restrained by the metal guard ring so as not to deform laterally, in the real soil layer, the soil sample in the initial state is affected by a certain lateral pressure transmitted by the surrounding soil body, and the lateral pressure is in a dynamic change state in the process of loading the soil sample. Therefore, the traditional lateral limit compression test cannot completely simulate the situation in a real soil layer, and the novel lateral limit compression test device for simulating the real stress state of the soil can truly simulate the stress state of the soil sample in the soil layer and dynamically monitor the lateral pressure value of the soil sample.
Disclosure of Invention
Aiming at the problems that the traditional lateral limit compression test cannot completely simulate the situation in a real soil layer, the applicability is weak in practical engineering, and the like, the utility model provides the novel lateral limit compression test device for simulating the real stress state of soil, which can truly simulate the stress state of a soil sample in the soil layer and dynamically monitor the lateral pressure value of the soil sample, and can obtain the more real mechanical property of the soil and the change condition of the lateral pressure value of the soil sample by using the test device, so that the requirements of practical engineering can be met.
The utility model relates to a novel lateral limit compression test instrument for simulating a true stress state of soil, which comprises an instrument body, a pressing device, a pressurizable water injection device, an exhaust pipeline, a water pressure monitoring device and a pore pressure monitoring device, wherein the pressing device is arranged on the instrument body; the device comprises an instrument body, wherein an annular testing cavity is vertically arranged in the center of the instrument body, a pressing device is arranged above the testing cavity in a matching manner, a placing groove is formed in the bottom of the testing cavity, the pressing device consists of a pressing rod and a shell, the pressing rod penetrates through the upper surface of the instrument body downwards along the axial direction and is inserted into the pressing cavity, and a pressure-bearing base is arranged in the pressing cavity; the utility model discloses a test cavity, including standing groove bottom trompil and test pipe, the standing groove bottom trompil is connected with exhaust duct and test pipe, and exhaust duct other end installs the discharge valve, and the test pipe other end is connected with pore pressure monitoring devices, all matches in standing groove top and pressure end below and be provided with the permeable stone, test cavity is inside to be used for placing columniform test soil sample, and the parcel has high elasticity, low deformation modulus's emulsion membrane all is provided with filter paper from top to bottom of test soil sample to contradict with the permeable stone of adjacent side through filter paper, instrument body outside is provided with the water injection device that can pressurize, but the water injection device that can pressurize is connected with test cavity through the water injection pipe, is provided with water pressure detection device on the inside wall of test cavity.
Specifically, the instrument body includes upper portion shell, middle part shell and lower part shell, and upper portion shell and middle part shell are annular, the permeable stone of pressure applying device and pressure applying device below sets up inside the upper portion shell, the test cavity sets up inside the middle part shell, the permeable stone of standing groove and standing groove top all sets up the position that corresponds in lower part shell upper surface and test cavity.
Specifically, the material of the ring-mounted test cavity adopts high-strength toughened glass capable of bearing the pressure of not less than 10 MPa.
Specifically, the upper shell, the middle shell and the lower shell of the instrument body are fixedly connected through a plurality of bolts.
Specifically, bubble-free water is filled in the test cavity, so that errors caused by monitoring of pressure values by bubbles can be reduced.
Specifically, the pressing device can apply the vertical load in a segmented or continuous manner by adopting a hydraulic mode.
Specifically, the test cavity is provided with the sealing strip with the water-permeable stone junction.
The utility model has novel structure and convenient operation, improves the situation that the stress state of the soil sample in the current lateral limit compression test is different from the stress state of the soil sample in the real soil layer, the initial state of the soil sample is not affected by the lateral pressure transmitted by the surrounding soil body and is restrained by the metal guard ring so as not to deform laterally, and the traditional lateral limit compression test can not completely simulate the situation in the real soil layer. The limitation of the current test is improved, the situation in a real soil layer can be simulated, and data which are more in line with reality can be obtained in the test process.
Drawings
FIG. 1 is a block diagram of a novel lateral limit compression test device for simulating the true stress state of soil;
FIG. 2 is a cross-sectional view of a novel lateral confinement compression test apparatus simulating the true stress state of earth;
FIG. 3 is a schematic view of the position of the sealing strip
Reference numerals in the drawings: the device comprises a 1-pressure applying device, a 2-pressure bearing base, a 3-permeable stone, a 4-test soil sample, a 5-bolt, a 6-pressurizable water injection device, a 7-water pressure monitoring device, an 8-test cavity, a 9-pore pressure monitoring device, a 10-exhaust pipeline, 11-filter paper, 12-test soil sample, a 13-upper shell, a 14-middle shell, a 15-lower shell and a 16-placing groove.
Detailed Description
The utility model is described in detail below with reference to the attached drawings and detailed description:
example 1:
as shown in fig. 1 and 2, a novel lateral limit compression test instrument for simulating the true stress state of soil comprises an instrument body, a pressing device, a pressurizable water injection device 6, an exhaust pipeline 10, a water pressure monitoring device 7 and a pore pressure monitoring device 9; the device comprises an instrument body, wherein an annular testing cavity 8 is vertically arranged in the center of the instrument body, a pressing device is arranged above the testing cavity 8 in a matching manner, a placing groove 16 is formed in the bottom of the testing cavity, the pressing device consists of a pressing rod 1 and a shell, the pressing rod 1 penetrates through the upper surface of the instrument body downwards along the axial direction and is inserted into the pressing cavity, and a pressure-bearing base 2 is arranged in the pressing cavity; the utility model discloses a test device, including standing groove 16, test cavity 8, filter paper 11, test cavity 8, filter paper 11 and water stone conflict of adjacent side, instrument body outside is provided with the water injection device that can pressurize 6, and the water injection device that can pressurize 6 is connected with test cavity 8 through the water injection pipe, is provided with water pressure detection device 7 on the inside wall of test cavity 8. In the experimental process, a test soil sample 4 is placed in the middle of a test cavity 8, the soil sample is a cylindrical sample, the periphery of the soil sample is wrapped by a high-elasticity and low-elasticity-modulus emulsion film, the filter paper 11 and the permeable stone 3 are arranged up and down in sequence, the permeable stone 3 and the filter paper 11 can ensure the penetration of water in the soil in the test process, in addition, the filter paper 11 can also prevent the loss of particles on the upper surface and the lower surface of the test soil sample 4, the structural integrity of the test soil sample 4 is ensured, the latex film is a test cavity 8 made of high-strength toughened glass, the water pressure of not lower than 10MPa can be borne, and the water with a certain pressure value can be injected into the test cavity 8 through a pressurizable water injection device 6 to simulate the condition of confining pressure of the soil sample in the real environment.
The instrument body includes upper portion shell 13, middle part shell 14 and lower part shell 15, and upper portion shell 13 and middle part shell 14 are annular, the permeable stone 3 of pressure applying device and pressure applying device below sets up inside upper portion shell 13, test cavity 8 sets up inside middle part shell 14, the permeable stone 3 of standing groove 16 and standing groove 16 top all sets up the position that corresponds in lower part shell 15 upper surface and test cavity 8. The upper casing 13, the middle casing 14 and the lower casing 15 of the instrument body are fixedly connected by a plurality of bolts 5.
In the test, the original state of the test soil sample 4, such as the depth and the surrounding load condition, is analyzed to obtain the confining pressure value of the test soil sample 4 in the original state. Next, water with the same pressure value as the previous calculated confining pressure value is injected into the test cavity 8 by the pressurizable water injection device 6 to realize the effect of applying confining pressure to the test soil sample 4. Then, a loading target stress value or strain value is set, and the pressure device is used for carrying out sectional or continuous vertical pressurization on the test soil sample 4 by taking the pressure bearing base 2 and the permeable stone 3 as force transmission media. An exhaust valve is arranged at the other end of the exhaust pipeline which is connected with the exhaust pipeline 10 and is opened in the process of pressurizing, and the exhaust valve can be opened for exhausting. In the continuous pressurization process, the computer end can monitor and record the vertical stress strain condition of the test soil sample in real time. Then, the water pressure monitoring device 7 is used for measuring the water pressure value in the test cavity 8 by taking water as a medium to obtain the change condition of the lateral pressure value of the test soil sample 4 in the test process, and the pore pressure monitoring device 9 is used for dynamically monitoring the change condition of the pore water pressure value in the test soil sample 4 in real time. And finally, obtaining a mechanical property change relation curve of soil such as vertical stress-vertical strain, effective vertical stress-vertical strain, lateral pressure, effective lateral pressure and the like at the computer end.
Example 2:
based on embodiment 1, the instrument body may be a split design, and the instrument body includes an upper housing 13, a middle housing 14 and a lower housing 15, where the upper housing 13 and the middle housing 14 are both annular, the water permeable stone 3 under the pressing device and the pressing device is disposed inside the upper housing 13, the test cavity 8 is disposed inside the middle housing 14, and the placing groove 16 and the water permeable stone 3 above the placing groove 16 are both disposed on the upper surface of the lower housing 15 and at positions corresponding to the test cavity 8. The design enables the instrument body to be disassembled before the test, is convenient for placing the test soil sample 4 and ensures the integrity of the appearance of the test soil sample 4. After the test soil sample is set, all parts of the instrument body are combined, and an upper shell 13, a middle shell 14 and a lower shell 15 of the instrument body are connected and fixed by a plurality of bolts 5.
Example 3:
on the basis of embodiment 1, as shown in fig. 3, a sealing strip is arranged at the joint of the test cavity 8 and the permeable stone 3, in the test process, as the test cavity 8 and the permeable stone 3 are made of hard materials, the joint is easy to collide with and leave gaps, and test errors are easy to generate in the subsequent pressurized water injection process, so that the sealing strip is arranged at the joint to ensure the tightness of the test cavity in the test process.
It is to be understood that the above-described embodiments of the present utility model are merely illustrative of or explanation of the principles of the present utility model and are in no way limiting of the utility model. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present utility model should be included in the scope of the present utility model. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (7)
1. The novel lateral limit compression test device for simulating the true stress state of soil is characterized by comprising an instrument body, a pressing device, a pressurizable water injection device (6), an exhaust pipeline (10), a water pressure monitoring device (7) and a pore pressure monitoring device (9); the device comprises an instrument body, wherein an annular testing cavity (8) is vertically arranged in the center of the instrument body, a pressing device is arranged above the testing cavity (8) in a matched mode, a placing groove (16) is formed in the bottom of the testing cavity, the pressing device consists of a pressing rod (1) and a shell, the pressing rod (1) penetrates through the upper surface of the instrument body downwards along the axial direction and is inserted into the pressing cavity, and a pressure bearing base (2) is arranged in the pressing cavity; the bottom of the placing groove (16) is provided with a hole and is connected with an exhaust pipeline (10) and a test catheter, the other end of the exhaust pipeline is provided with an exhaust valve, the other end of the test catheter is connected with a pore pressure monitoring device (9), permeable stones (3) are arranged above the placing groove (16) and below the pressure applying end in a matched mode, the inside of the test cavity (8) is used for placing a cylindrical test soil sample (4), the test soil sample (4) is wrapped up around and is provided with high elasticity, low deformation modulus's emulsion membrane, and the upper and lower of test soil sample (4) all is provided with filter paper (11) to contradict through filter paper (11) and the permeable stone of adjacent side, but instrument body outside is provided with pressurization water injection device (6), but pressurization water injection device (6) are connected with test cavity (8) through the water injection pipe, are provided with water pressure monitoring devices (7) on the inside wall of test cavity (8).
2. The novel lateral limit compression test device for simulating the true stress state of soil according to claim 1, wherein the instrument body comprises an upper shell (13), a middle shell (14) and a lower shell (15), the upper shell (13) and the middle shell (14) are annular, the permeable stone (3) below the pressing device and the pressing device are arranged inside the upper shell (13), the test cavity (8) is arranged inside the middle shell (14), and the placing groove (16) and the permeable stone (3) above the placing groove (16) are arranged at positions corresponding to the test cavity (8) on the upper surface of the lower shell (15).
3. The novel lateral limit compression test device for simulating the true stress state of soil according to claim 1, wherein the test cavity (8) is made of high-strength toughened glass capable of bearing pressure not lower than 10 MPa.
4. The novel lateral limit compression test device for simulating the true stress state of soil according to claim 1, wherein an upper shell (13), a middle shell (14) and a lower shell (15) of the instrument body are fixedly connected by a plurality of bolts (5).
5. The novel lateral limit compression test device for simulating the true stress state of soil according to claim 1, wherein bubble-free water is filled in the test cavity (8).
6. The novel lateral limit compression test device for simulating the true stress state of soil according to claim 1, wherein the pressing device can be used for applying vertical load in a segmented or continuous mode in a hydraulic mode.
7. The novel lateral limit compression test device for simulating the true stress state of soil according to claim 1, wherein a sealing strip is arranged at the joint of the test cavity and the permeable stone.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222802057.6U CN218937995U (en) | 2022-10-24 | 2022-10-24 | Novel lateral limit compression test device for simulating true stress state of soil |
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| CN202222802057.6U CN218937995U (en) | 2022-10-24 | 2022-10-24 | Novel lateral limit compression test device for simulating true stress state of soil |
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| CN218937995U true CN218937995U (en) | 2023-04-28 |
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| CN202222802057.6U Active CN218937995U (en) | 2022-10-24 | 2022-10-24 | Novel lateral limit compression test device for simulating true stress state of soil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117232982A (en) * | 2023-11-10 | 2023-12-15 | 上海海洋地质勘察设计有限公司 | Test equipment and test method for soil sample deformation test |
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- 2022-10-24 CN CN202222802057.6U patent/CN218937995U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117232982A (en) * | 2023-11-10 | 2023-12-15 | 上海海洋地质勘察设计有限公司 | Test equipment and test method for soil sample deformation test |
| CN117232982B (en) * | 2023-11-10 | 2024-03-26 | 上海海洋地质勘察设计有限公司 | Test equipment and test method for soil sample deformation test |
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