Device for measuring water potential change in soil shear deformation process

Abstract

The utility model discloses a device for measuring water potential change in a soil shear deformation process, which comprises a test platform, and a test mechanism, a measuring mechanism and a data monitoring mechanism which are arranged on the upper surface of the test platform, and the measuring mechanism and the data monitoring mechanism are in communication connection with each other. A loading mechanism is correspondingly arranged above the testing mechanism, the loading mechanism is used for loading soil in the testing mechanism, the testing mechanism comprises a shear box and a placement bin formed in the shear box, a pressure guide pipe is arranged between the shear box and the measuring mechanism, and the pressure guide pipe is connected with the loading mechanism. The pressure guide pipe is fixed on the side surface of the shear box through a fixing assembly; a pottery clay head is fixed to one end of the pressure guiding pipe and penetrates through the interior of the containing bin, and water in soil in the containing bin enters the pressure guiding pipe through holes in the surface of the pottery clay head in the soil shearing deformation process. According to the utility model, the water potential change of the soil in the shear box can be measured while the soil shear test is carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of soil water potential detection, in particular to a device for measuring water potential changes in the process of soil shear deformation. Background Art

[0002] The determination of soil water potential is an important step in the process of studying soil hydrological properties. Soil shear is the key to soil mechanics research. Existing soil shear equipment cannot measure water potential changes while measuring soil shear resistance. In addition, there are few studies on water potential changes during soil shear. To this end, we provide a device for measuring water potential changes during soil shear deformation to solve the above problems. Utility Model Content

[0003] The purpose of the utility model is to make up for the deficiencies of the prior art and provide a device for measuring water potential changes in the process of soil shear deformation. The device has the advantage of monitoring water potential changes in the soil shear process.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a device for measuring the change of water potential during the shear deformation of soil, including a test platform and a test mechanism, a measuring mechanism and a data monitoring mechanism arranged on the upper surface of the test platform, the measuring mechanism and the data monitoring mechanism are communicated with each other, a loading mechanism is correspondingly arranged above the test mechanism, the loading mechanism is used to load the soil in the test mechanism, the test mechanism includes a shear box and a placement bin opened inside the shear box, a pressure pipe is arranged between the shear box and the measuring mechanism, the pressure pipe is fixed to the side of the shear box through a fixing assembly; a clay head is fixed to one end of the pressure pipe, the clay head is penetrated into the interior of the placement bin, and the water in the soil inside the placement bin enters the pressure pipe through the pores on the surface of the clay head during the shear deformation of the soil.

[0005] Furthermore, a support frame is fixed on the upper surface of the test platform, and the loading mechanism is fixed on the support frame.

[0006] Furthermore, the test mechanism is slidably arranged on the test platform.

[0007] Furthermore, an upper cover is provided at the upper end of the placement bin, a measuring hole is provided at the side of the shear box, and the clay head and the pressure-guiding tube are passed through the measuring hole and are arranged inside the placement bin.

[0008] Furthermore, the fixing assembly includes a fixing ring and a movable chamber opened inside the fixing ring, and a rotating shaft, a threaded tube, a pushing block and a limiting rod are also arranged inside the movable chamber.

[0009] Furthermore, the rotating shaft is passed through the movable warehouse through a bearing, a knob is fixed to the outer end of the rotating shaft, and a thread is provided on the surface. The threaded tube is movably connected to the rotating shaft through a thread, and the pushing block is fixed at one end of the threaded tube. The limit rod is perpendicular to the pushing block, and the two are in sliding contact through an inclined surface. A limit groove is provided on the surface of the measuring hole, and the limit rod is clamped in the limit groove when it is extended forward.

[0010] Furthermore, a spring is sleeved on the surface of the limiting rod, and when the pushing block retreats, the spring drives the limiting rod to retract and separate from the limiting groove.

[0011] Furthermore, a slider is fixed on the side of the threaded tube, a slide groove is opened on the surface of the movable bin, the slider is slidably connected in the slide groove, and the threaded tube is movably connected in the movable bin through the slider and the slide groove.

[0012] Furthermore, a sealing sleeve is fixed on the surface of the fixing ring, and a side surface of the sealing sleeve is in contact with the measuring hole.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The utility model can measure the change of water potential of the soil in the shear box during the soil shear test. With the data monitoring system, it can present the trend image of the water potential change of the test soil sample during shearing in real time and save the data. At the same time, the clay head of the utility model is small in size and has uniform pores, which can conduct the pressure of pore water in a very small space.

[0015] 2. The utility model fixes the pressure-leading pipe on the side of the shear box through a fixing component, which not only prevents the pressure-leading pipe from shaking during the soil shearing process, causing the soil to leak out of the measuring hole, but also enables the pressure-leading pipe to maintain a stable state during the shearing process. At the same time, the sealing sleeve can also prevent water in the soil from flowing out of the measuring hole, causing errors in subsequent monitoring data.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0018] Figure 2 It is a front view cross-sectional structural schematic diagram of the utility model;

[0019] Figure 3 For this utility model Figure 2 Schematic diagram of the structure enlarged at point A in the middle.

[0020] The markings in the figure are: 1. test platform; 2. support frame; 3. loading mechanism; 4. test mechanism; 401. shear box; 402. placement bin; 403. upper cover; 404. measuring hole; 405. limiting groove; 5. measuring mechanism; 6. pressure pipe; 7. clay head; 8. fixing assembly; 801. fixing ring; 802. movable bin; 803. rotating shaft; 804. knob; 805. threaded tube; 806. pushing block; 807. limiting rod; 808. spring; 809. slider; 9. data monitoring mechanism; 10. sealing sleeve. DETAILED DESCRIPTION

[0021] The utility model is described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] See also Figure 1-3 , the utility model provides an embodiment: a device for measuring the change of water potential during soil shear deformation, including a test platform 1 and a test mechanism 4, a measuring mechanism 5 and a data monitoring mechanism 9 arranged on the upper surface of the test platform 1, and a hydraulic device for providing shear force is arranged on both sides of the test mechanism 4. The above mechanisms and devices are all implemented using existing components of existing equipment. Then, a support frame 2 is also fixed on the upper surface of the test platform 1, and a loading mechanism 3 is fixed on the lower surface of the support frame 2, and the positions of the loading mechanism 3 and the test mechanism 4 correspond. The test mechanism 4 includes a shear box 401 and a placement bin 402 opened inside the shear box 401, an upper cover 403 is arranged on the surface of the placement bin 402, and a measuring hole 404 is opened on the side of the shear box 401, and a clay head 7 and a pressure pipe 6 can be inserted into the placement bin 402 through the measuring hole 404; a clay head 7 is fixed at one end of the pressure pipe 6, and the clay head 7 can be inserted into the test mechanism 4. The shear box includes a lower box and an upper box. The surface of the test platform can be provided with a slide rail. The bottom surface of the lower box is connected to a sliding block. The lower box can be movably connected to the surface of the test platform through the sliding block and the slide rail. The upper box is fixed to the lower box with diagonal screws on the top. A handle is fixedly connected to one side. The handle is connected to the support rod. A hydraulic rod is fixed to the side of the support frame. The hydraulic rod can be fixed to the side of the upper box. There are two hydraulic rods, and the other hydraulic rod is fixed to the side of the lower box. The utility model can measure the change of water potential of the soil in the shear box 401 while performing a soil shear test. With the data monitoring system, it can present a trend image of the water potential change of the test soil sample during shearing in real time, and can save data. At the same time, the clay head 7 of the utility model is small in size and has uniform pores, and can conduct the pressure of pore water in a very small space.

[0023] The fixing assembly 8 includes a fixing ring 801 and a movable chamber 802 opened inside the fixing ring 801, and a rotating shaft 803, a threaded tube 805, a pushing block 806 and a limiting rod 807 are also arranged inside the movable chamber 802; the rotating shaft 803 can be passed through the surface of the movable chamber 802 through a bearing, a knob 804 is fixed to one end of the rotating shaft 803, a thread is opened on the surface of the rotating shaft 803, the threaded tube 805 can be movably connected to the rotating shaft 803 through the thread, the pushing rod is fixed to one end of the threaded tube 805, the limiting rod 807 is perpendicular to the pushing block 806, and the measuring A limiting groove 405 is provided on the surface of the fixed hole 404, and a limiting rod 807 can be clamped in the limiting groove 405, and a spring 808 is sleeved on the surface of the limiting rod 807; the utility model uses a fixing component 8 to fix the pressure-conducting pipe 6 on the side of the shear box 401, which can not only prevent the pressure-conducting pipe 6 from shaking during the soil shearing process, causing the soil to leak out of the measuring hole 404, but also enable the pressure-conducting pipe 6 to maintain a stable state during the shearing process. At the same time, the sealing sleeve 10 can also prevent water in the soil from flowing out of the measuring hole 404, causing errors in subsequent monitoring data.

[0024] A slider 809 is fixed on the side of the threaded tube 805 , and a slide groove is provided on the surface of the movable bin 802 . The slider 809 can be slidably connected in the slide groove, and the threaded tube 805 can be movably connected in the movable bin 802 through the slider 809 and the slide groove.

[0025] A sealing sleeve 10 is fixed on the surface of the fixing ring 801 , and the side surface of the sealing sleeve 10 can fit with the measuring hole 404 .

[0026] The data monitoring mechanism 9 and the measuring mechanism 5 can be connected via data; the measuring mechanism 5 uses a pressure sensor to convert the water pressure into an electrical signal, and the data monitoring mechanism performs data recording and monitoring.

[0027] The working principle of the device is as follows: first, the staff opens the upper cover 403, piles the test soil in the placement bin 402, flattens and compacts the test soil, then presses the upper cover 403 on top of the test soil, and adjusts the position of the test mechanism 4 to make it correspond to the loading mechanism 3; then, the staff fixes the clay head 7 to one end of the pressure-inducing pipe 6, and places the clay head 7 and the pressure-inducing pipe 6 in the test soil through the measurement hole 404 on the side of the shear box 401, and makes the clay head 7 be located in the middle of the placement bin 402; then, the staff drives the rotating shaft 803 to rotate by turning the knob 804, and the rotating shaft 803 drives the threaded pipe 8 05 moves, and drives the pushing block 806 fixed at one end of the threaded tube 805 to move synchronously, the pushing block 806 can push the limiting rod 807 to move toward the limiting groove 405, when the limiting rod 807 is clamped in the limiting groove 405, stop turning the knob 804; finally, the staff loads the soil in the shear box 401 through the loading mechanism 3, and then shears the soil in the shear box through the hydraulic device. At this time, the water in the soil enters the pressure-inducing pipe through the pores on the surface of the clay head during the shear deformation of the soil, and then the measuring mechanism converts the water pressure into an electrical signal, and the monitoring mechanism monitors and records the dynamic changes of all data during the test.

[0028] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the above embodiments do not limit the protection scope of the utility model in any form, and all technical solutions obtained by equivalent replacement and other methods fall within the protection scope of the utility model. The parts not involved in the utility model are the same as the existing technology or can be implemented by the existing technology.

Claims

1. A device for measuring water potential changes during soil shear deformation, comprising a test platform (1) and a test mechanism (4), a measuring mechanism (5) and a data monitoring mechanism (9) arranged on the upper surface of the test platform (1), wherein the measuring mechanism (5) and the data monitoring mechanism (9) are connected to each other in communication, and a loading mechanism (3) is correspondingly arranged above the test mechanism (4), and the loading mechanism (3) is used to load the soil in the test mechanism (4), characterized in that: The test mechanism (4) comprises a shear box (401) and a placement chamber (402) opened inside the shear box (401); a pressure-inducing tube (6) is provided between the shear box (401) and the measuring mechanism (5); the pressure-inducing tube (6) is fixed to the side of the shear box (401) via a fixing assembly (8); a clay head (7) is fixed to one end of the pressure-inducing tube (6); the clay head (7) is passed through the interior of the placement chamber (402); water in the soil inside the placement chamber (402) enters the pressure-inducing tube (6) through the pores on the surface of the clay head (7) during the shear deformation of the soil.

2. A device for measuring water potential changes during soil shear deformation according to claim 1, characterized in that: A support frame (2) is fixed on the upper surface of the test platform (1), and the loading mechanism (3) is fixed on the support frame (2).

3. The device for measuring water potential changes during soil shear deformation according to claim 1, characterized in that: The test mechanism (4) is slidably arranged on the test platform (1).

4. The device for measuring water potential changes during soil shear deformation according to claim 1, characterized in that: An upper cover (403) is provided at the upper end of the placement bin (402), a measuring hole (404) is provided on the side of the shear box (401), and the clay head (7) and the pressure-guiding tube (6) are inserted into the placement bin (402) through the measuring hole (404).

5. A device for measuring water potential changes during soil shear deformation according to claim 4, characterized in that: The fixing assembly (8) comprises a fixing ring (801) and a movable chamber (802) disposed inside the fixing ring (801); a rotating shaft (803), a threaded tube (805), a pushing block (806) and a limiting rod (807) are also disposed inside the movable chamber (802).

6. A device for measuring water potential changes during soil shear deformation according to claim 5, characterized in that: The rotating shaft (803) is inserted into the movable chamber (802) via a bearing, a knob (804) is fixed to one end of the outer side of the rotating shaft (803), and a thread is provided on the surface, the threaded tube (805) is movably connected to the rotating shaft (803) via a thread, the pushing block (806) is fixed to one end of the threaded tube (805), the limiting rod (807) is perpendicular to the pushing block (806), and the two are in sliding contact via an inclined surface, a limiting groove (405) is provided on the surface of the measuring hole (404), and the limiting rod (807) is engaged in the limiting groove (405) when extending forward.

7. The device for measuring the change of water potential during soil shear deformation according to claim 6, characterized in that: A spring (808) is sleeved on the surface of the limiting rod (807), and when the pushing block (806) moves backward, the spring (808) drives the limiting rod (807) to retract and separate from the limiting groove (405).

8. The device for measuring water potential changes during soil shear deformation according to claim 5, characterized in that: A slider (809) is fixed to the side of the threaded tube (805), a slide groove is provided on the surface of the movable bin (802), the slider (809) is slidably connected in the slide groove, and the threaded tube (805) is movably connected in the movable bin (802) via the slider (809) and the slide groove.

9. The device for measuring water potential changes during soil shear deformation according to claim 5, characterized in that: A sealing sleeve (10) is fixed on the surface of the fixing ring (801), and a side surface of the sealing sleeve (10) is in contact with the measuring hole (404).

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