CN211179450U - Soil body permeation test device under variable stress condition - Google Patents
Soil body permeation test device under variable stress condition Download PDFInfo
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- CN211179450U CN211179450U CN201922076943.3U CN201922076943U CN211179450U CN 211179450 U CN211179450 U CN 211179450U CN 201922076943 U CN201922076943 U CN 201922076943U CN 211179450 U CN211179450 U CN 211179450U
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Abstract
The utility model discloses a soil body permeation test device under variable stress condition, including the base, be equipped with soil sample, sample cell, water installations, water outlet device, electron displacement meter, side direction loading pneumatic cylinder, vertical loading pneumatic cylinder on the base, hold the sample cell of soil sample, including the side pressure board of arranging along square each limit to and the side limiting plate that sets up along the extending direction in side pressure board both ends, adjacent side limiting plate two liang link to each other, is the well check with the side pressure board and arranges, the soil sample is placed in the central compartment that each side pressure board encloses and protects; a water installations for providing infiltration water pressure to soil sample, including the inlet tube, inlet tube one end intercommunication has the water supply tank, and the inlet tube is followed to keep away from water supply tank direction intercommunication in proper order and is had booster pump, first water pressure gauge, first flow control valve, and the terminal intercommunication of inlet tube has the intake antrum, and the intake antrum is square and sets up soil sample up end, the intake antrum lower extreme with protection film flange joint. The utility model discloses can simulate the true stress state of sample in the test process, can change the stress state of certain one side or a plurality of faces of sample as required, the accurate soil body that obtains changes the law at stress increase and decrease in-process osmotic coefficient.
Description
Technical Field
The utility model relates to a geotechnical engineering field especially relates to a soil body permeation test device and method under variable stress condition.
Background
In saturated soils, water flows through the pores under pressure to form a percolation phenomenon. The permeability is an important characteristic of soil, seepage can cause deformation of the soil body, engineering safety is directly influenced, and research on the permeability and seepage rule of the soil has important significance on engineering practice. The permeability characteristics of the soil body can be obtained through two ways, namely a field method or an indoor method, wherein the field method mostly adopts a water pumping method or a water injection method, and the indoor method adopts a permeability test device, such as a Darcy permeability test device. However, when the existing penetration test device and method are used for carrying out penetration tests on soil bodies, soil samples under a constant stress state are adopted, the stress state and the change process of the soil bodies are mostly ignored, and the situation is obviously not consistent with the actual situation. For example, in the tunnel excavation process, the surrounding rock in front of the tunnel face is in a six-face stress state, and as the tunnel excavation is carried out, the ground stress of one face close to the tunnel face is gradually released, so that the surrounding rock state is changed, and the permeability is further influenced; in the process of filling the high embankment, along with the filling of the upper soil body, the stress of the lower soil body is gradually increased, and the permeability characteristic of the soil body is changed. Therefore, the conventional penetration test apparatus cannot accurately simulate the penetration characteristics of soil under the variable stress condition.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a soil body infiltration test device and method under the variable stress condition.
In order to achieve the above purpose, the technical scheme of the utility model is that: a soil body penetration test device under variable stress condition comprises a base, wherein the base is provided with a hole
The soil sample is in a square column shape, and a protective film is coated outside the soil sample;
the sample chamber for containing the soil sample comprises side pressure plates arranged along each side of a square shape and side limiting plates arranged along the extending direction of two ends of each side pressure plate, every two adjacent side limiting plates are connected with each other and arranged in a well grid shape with the side pressure plates, and the soil sample is placed between central grids enclosed by the side pressure plates;
the water inlet device for providing osmotic water pressure for the soil sample comprises a water inlet pipe, wherein one end of the water inlet pipe is communicated with a water supply tank, the water inlet pipe is sequentially communicated with a booster pump, a first water pressure gauge and a first flow control valve along the direction far away from the water supply tank, the tail end of the water inlet pipe is communicated with a water inlet groove, the water inlet groove is square and is arranged on the upper end surface of the soil sample, and the lower end of the water inlet groove is connected with a protective film flange;
the water outlet device for collecting the test wastewater comprises a water outlet groove, wherein the water outlet groove is square and is arranged at the bottom of the soil sample, the upper end of the water outlet groove is connected with the protective film flange, the lower end of the water outlet groove is communicated with a water outlet pipe, the water outlet pipe is sequentially communicated with a second water pressure gauge, a flow meter, a second flow control valve and a water storage water tank along the direction far away from the square of the water outlet groove, and the second water pressure gauge and the flow meter are used for monitoring the seepage condition in the test process;
the electronic displacement meters are respectively arranged on the pressure plates on the sides and the water inlet tank and are used for measuring the lateral deformation and the vertical deformation of the soil sample;
the loading mechanism comprises lateral loading hydraulic cylinders corresponding to the side pressure plates and vertical loading hydraulic cylinders corresponding to the water inlet grooves, the lateral loading hydraulic cylinders are respectively connected with the corresponding side pressure plates, and horizontal loads are applied to the side faces of the soil sample through the side pressure plates; the vertical loading hydraulic cylinder is connected with the water inlet tank, and vertical load is applied to the top surface of the soil sample through the water inlet tank;
the computer is respectively connected with the lateral loading hydraulic cylinder and the vertical loading hydraulic cylinder and controls the size of the output load; the computer is also connected with the first flow control valve and the second flow control valve respectively to control the start and stop of the water inlet device and the water outlet device.
Further, the loading mechanism further comprises a reaction frame, the reaction frame comprises stand columns and cross beams, the stand columns are arranged in a cross shape, the cross beams are in a cross shape, the end parts of the cross beams are respectively supported at the top ends of the stand columns, the lateral loading hydraulic cylinders are respectively installed on the stand columns, and the vertical loading hydraulic cylinders are installed on the cross beams.
Furthermore, the side limiting plate is an L-shaped plate, a linear sliding groove is formed in the side face of the L-shaped plate, the side pressure plate is a U-shaped plate, and a sliding block embedded in the linear sliding groove is arranged on the outer side face of each leg of the U-shaped plate.
Furthermore, an anti-filtration layer is arranged between the soil sample and the water inlet tank and between the soil sample and the water outlet tank.
Further, the protective film adopts a latex sleeve.
The utility model has the advantages that: the utility model discloses can simulate the true stress state of sample in the test process, can change the stress state of certain one side or a plurality of faces of sample as required, the accurate soil body that obtains accords with engineering practice at stress increase and decrease in-process osmotic coefficient change law more. The utility model has the advantages of being simple in structure and convenient in operation, convenient to popularize and use.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the construction of the sample chamber;
FIG. 3 is a schematic view of the installation of a soil sample;
in the figure, 1, a base; 2. soil sampling; 3. a protective film; 4. a side pressure plate; 5. a side limiting plate; 6. a water inlet pipe; 7. a water supply tank; 8. a booster pump; 9. a first water pressure gauge; 10. a first flow control valve; 11. a water inlet groove; 12. a water outlet groove; 13. a water outlet pipe; 14. a second water pressure gauge; 15. a flow meter; 16. a second flow control valve; 17. a water storage tank; 18. an electronic displacement meter; 19. a lateral loading hydraulic cylinder; 20. a vertical loading hydraulic cylinder; 21. a column; 22. a cross member.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
As shown in figures 1-3, the soil body penetration test device under the variable stress condition comprises a base 1, wherein the base 1 is provided with a soil body penetration test device
The soil sample 2 is a square column, and a protective film 3 is coated outside the soil sample 2; the protective film 3 is preferably a latex sleeve;
the sample chamber for containing the soil sample 2 comprises side pressure plates 4 arranged along each side of a square shape and side limiting plates 5 arranged along the extending direction of two ends of each side pressure plate 4, every two adjacent side limiting plates 5 are connected with each other and arranged in a well grid shape with the side pressure plates 4, and the soil sample 2 is placed in a central grid surrounded by the side pressure plates 4;
the water inlet device for providing osmotic water pressure for the soil sample 2 comprises a water inlet pipe 6, wherein one end of the water inlet pipe 6 is communicated with a water supply tank 7, the water inlet pipe 6 is sequentially communicated with a booster pump 8, a first water pressure gauge 9 and a first flow control valve 10 along the direction far away from the water supply tank 7, the tail end of the water inlet pipe 6 is communicated with a water inlet groove 11, the water inlet groove 11 is square and is arranged on the upper end surface of the soil sample 2, and the lower end of the water inlet groove 11 is in flange connection with the protective film 3;
the water outlet device for collecting the test wastewater comprises a water outlet groove 12, wherein the water outlet groove 12 is square and is arranged at the bottom of the soil sample 2, the upper end of the water outlet groove 12 is in flange connection with the protective film 3, the lower end of the water outlet groove 12 is communicated with a water outlet pipe 13, the water outlet pipe 13 is sequentially communicated with a second water pressure gauge 14, a flow meter 15, a second flow control valve 16 and a water storage tank 17 along the square far away from the water outlet groove 12, and the second water pressure gauge 14 and the flow meter 15 are used for monitoring the seepage condition in the test process;
the electronic displacement meters 18 are respectively arranged on the side pressure plates 4 and the water inlet tank 11 and are used for measuring the lateral deformation and the vertical deformation of the soil sample 2;
the loading mechanism comprises lateral loading hydraulic cylinders 19 corresponding to the side pressure plates 4 and vertical loading hydraulic cylinders 20 corresponding to the water inlet grooves 11, the lateral loading hydraulic cylinders 19 are respectively connected with the corresponding side pressure plates 4, and horizontal loads are applied to the side faces of the soil sample 2 through the side pressure plates 4; the vertical loading hydraulic cylinder 20 is connected with the water inlet tank 11, and applies vertical load to the top surface of the soil sample 2 through the water inlet tank 11; the reaction frame comprises upright columns 21 and cross beams 22, the upright columns 21 are arranged in a cross shape, the cross beams 22 are in a cross shape, the end parts of the cross beams are respectively supported at the top ends of the upright columns 21, the lateral loading hydraulic cylinders 19 are respectively arranged on the upright columns 21, and the vertical loading hydraulic cylinders 20 are arranged on the cross beams 22;
the computer is respectively connected with the lateral loading hydraulic cylinder 19 and the vertical loading hydraulic cylinder 20 and controls the size of the output load; the computer is also connected with the first flow control valve 10 and the second flow control valve 16 respectively to control the start and stop of the water inlet device and the water outlet device.
The computer is also respectively connected with the electronic displacement meter 18, the flowmeter 15, the first water pressure meter 9 and the second water pressure meter 14, acquires test parameter information through a software program, and calculates and displays the deformation condition and the permeability coefficient of the sample in real time.
The utility model discloses can simulate the true stress state of sample in the test process, can change the stress state of certain one side or a plurality of faces of sample as required, the accurate soil body that obtains accords with engineering practice at stress increase and decrease in-process osmotic coefficient change law more. The utility model has the advantages of being simple in structure and convenient in operation, convenient to popularize and use.
The experimental device is used for carrying out the soil body infiltration test under the variable stress condition, and the steps are as follows:
s1, fixing the lower end of the latex sleeve with a water outlet groove 12 by using a flange plate, arranging an inverted filter layer above the square water outlet groove 12, installing a rectangular steel die outside the latex sleeve, preparing a sample on the water outlet groove 12 in a layering manner according to the requirements of geotechnical test regulations S L237 plus 1999, recording the side length L and the height h of the bottom surface of the sample, placing the inverted filter layer on the upper end surface of the sample, detaching the rectangular steel die, placing a water inlet groove 11 on the sample, and fixing the upper end of the latex sleeve with the water inlet groove 11 by using the flange plate;
s2, each lateral loading hydraulic cylinder 19 is installed on the upright post 21 of the counterforce frame, and the output end of the lateral loading hydraulic cylinder is connected with the corresponding lateral pressure plate; mounting a vertical loading hydraulic cylinder 20 on a cross beam 22 of a counterforce frame;
s3, controlling the lateral loading hydraulic cylinder 19 and the vertical loading hydraulic cylinder 20 through a computer to enable each lateral pressure plate to be in contact with the side surface of the sample, and enabling the vertical loading hydraulic cylinder 20 and the output end of the vertical loading hydraulic cylinder to be connected with the upper end surface of the water inlet tank 11;
s4, controlling the lateral loading hydraulic cylinder 19 and the vertical loading hydraulic cylinder 20 to output specified loads respectively through the computer;
s5, opening the first flow control valve 10, starting the booster pump 8 after the numerical values of the first water pressure gauge 9 and the second water pressure gauge 14 are constant, applying water pressure, controlling the flow through the flow control valve, simultaneously opening the second flow control valve 16, and starting the permeation test;
s6, controlling the output load of the vertical loading hydraulic cylinder 20 and the lateral loading hydraulic cylinder 19 by using a computer, changing the stress state of one or more surfaces of the sample, simulating the soil stress change process, recording the height deformation delta h, the length deformation delta L1, the width deformation delta L2 and the flow Q penetrating through the sample in t time, and the reading p1 of the first water pressure gauge 9 and the reading p2 of the second water pressure gauge 14 at the end of the time, wherein the calculation formula of the permeability coefficient is as follows:
s7 and repeating S6, the permeability characteristics of the sample under different stress states can be obtained.
The described embodiments are only some, but not all embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
Claims (5)
1. A soil body penetration test device under a variable stress condition is characterized by comprising a base, wherein the base is provided with a hole
The soil sample is in a square column shape, and a protective film is coated outside the soil sample;
the sample chamber for containing the soil sample comprises side pressure plates arranged along each side of a square shape and side limiting plates arranged along the extending direction of two ends of each side pressure plate, every two adjacent side limiting plates are connected with each other and arranged in a well grid shape with the side pressure plates, and the soil sample is placed between central grids enclosed by the side pressure plates;
the water inlet device for providing osmotic water pressure for the soil sample comprises a water inlet pipe, wherein one end of the water inlet pipe is communicated with a water supply tank, the water inlet pipe is sequentially communicated with a booster pump, a first water pressure gauge and a first flow control valve along the direction far away from the water supply tank, the tail end of the water inlet pipe is communicated with a water inlet groove, the water inlet groove is square and is arranged on the upper end surface of the soil sample, and the lower end of the water inlet groove is connected with a protective film flange;
the water outlet device for collecting the test wastewater comprises a water outlet groove, wherein the water outlet groove is square and is arranged at the bottom of the soil sample, the upper end of the water outlet groove is connected with the protective film flange, the lower end of the water outlet groove is communicated with a water outlet pipe, the water outlet pipe is sequentially communicated with a second water pressure gauge, a flow meter, a second flow control valve and a water storage water tank along the direction far away from the square of the water outlet groove, and the second water pressure gauge and the flow meter are used for monitoring the seepage condition in the test process;
the electronic displacement meters are respectively arranged on the pressure plates on the sides and the water inlet tank and are used for measuring the lateral deformation and the vertical deformation of the soil sample;
the loading mechanism comprises lateral loading hydraulic cylinders corresponding to the side pressure plates and vertical loading hydraulic cylinders corresponding to the water inlet grooves, the lateral loading hydraulic cylinders are respectively connected with the corresponding side pressure plates, and horizontal loads are applied to the side faces of the soil sample through the side pressure plates; the vertical loading hydraulic cylinder is connected with the water inlet tank, and vertical load is applied to the top surface of the soil sample through the water inlet tank;
the computer is respectively connected with the lateral loading hydraulic cylinder and the vertical loading hydraulic cylinder and controls the size of the output load; the computer is also connected with the first flow control valve and the second flow control valve respectively to control the start and stop of the water inlet device and the water outlet device.
2. The soil infiltration testing device under variable stress condition of claim 1, wherein the loading mechanism further comprises a reaction frame, the reaction frame comprises upright columns and cross beams, the upright columns are arranged in a cross shape, the cross beams are arranged in a cross shape, the end parts of the cross beams are respectively supported at the top ends of the upright columns, the lateral loading hydraulic cylinders are respectively installed on the upright columns, and the vertical loading hydraulic cylinders are installed on the cross beams.
3. The soil infiltration testing device under variable stress conditions of claim 1, wherein the side limiting plate is an L-shaped plate, the side surface of the L-shaped plate is provided with a linear sliding groove, the side pressure plate is a U-shaped plate, and the outer side surface of the leg of the U-shaped plate is provided with a sliding block embedded in the linear sliding groove.
4. The soil infiltration testing device under variable stress conditions of claim 1, wherein the anti-filtration layer is arranged between the soil sample and the water inlet tank and between the soil sample and the water outlet tank.
5. The apparatus of claim 1, wherein the protective membrane is a latex sleeve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922076943.3U CN211179450U (en) | 2019-11-27 | 2019-11-27 | Soil body permeation test device under variable stress condition |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922076943.3U CN211179450U (en) | 2019-11-27 | 2019-11-27 | Soil body permeation test device under variable stress condition |
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| CN211179450U true CN211179450U (en) | 2020-08-04 |
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| CN201922076943.3U Active CN211179450U (en) | 2019-11-27 | 2019-11-27 | Soil body permeation test device under variable stress condition |
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