A shear apparatus for testing the shear strength of soft soil

Abstract

The utility model relates to soil sample detection technical field especially relates to a kind of shearometer for soft soil shear strength test, it includes folding plate groove, folding plate groove bottom is placed with water collecting tank, folding plate groove upper side is fixedly installed with frame, and frame bottom is provided with the shear strength test component for soft soil detection;Shear strength test component includes box groove, upper sleeve frame, valve plate and first hydraulic rod, first hydraulic rod output end is fixedly connected with valve plate, and valve plate bottom is fixedly installed with upper water-permeable stone plate, and upper water-permeable stone plate and upper sleeve frame inner wall sliding contact, and valve plate side wall is evenly connected with several drainage hoses, and drainage hose inside end extends to upper water-permeable stone plate upper side, and box groove bottom is provided with several bottom through-holes.The utility model is provided with shear strength test component, has complete water filtration and drainage path, can keep mesa clean, facilitate the normal progress of subsequent test, reduce the workload of staff, strengthen practicality.

Description

Technical Field

[0001] This utility model relates to the field of soil sample testing technology, and in particular to a shear apparatus for testing the shear strength of soft soil. Background Technology

[0002] In fields such as civil engineering and geological exploration, accurate testing of the shear strength of soft soil is a crucial step in assessing engineering issues such as foundation stability and slope safety.

[0003] Traditional soil shear testing equipment primarily obtains relevant mechanical parameters by applying pressure and shear force to the soil sample when testing the shear strength of soft soil. However, during the shear test, a large amount of water is expelled from the soil sample due to the squeezing action. This water lacks effective collection and treatment methods and flows directly onto the test platform, not only polluting the experimental environment and increasing post-test cleaning workload, but also potentially seeping into the equipment, corroding precision instruments, and affecting the normal operation and lifespan of the equipment. Furthermore, the accumulation of water on the platform can interfere with the operation of the test personnel.

[0004] Therefore, developing a shear tester for soft soil shear strength testing that has complete filtration and drainage paths during the testing process and can keep the test platform clean has become an urgent need to solve the current problem. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a shear apparatus for testing the shear strength of soft soil.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A shear tester for testing the shear strength of soft soil includes a folded plate groove, a water collection trough placed at the bottom of the folded plate groove, a frame fixedly installed on the upper side of the folded plate groove, and a shear strength testing component for soft soil testing installed at the bottom of the frame. The shear strength testing component includes a box groove, an upper sleeve frame, a valve plate, and a first hydraulic rod. The output end of the first hydraulic rod is fixedly connected to the valve plate. An upper permeable stone slab is fixedly installed at the bottom of the valve plate and slides in contact with the inner wall of the upper sleeve frame. Several drainage hoses are evenly distributed and connected on the side wall of the valve plate, and the inner ends of the drainage hoses extend to the upper side of the upper permeable stone slab. Several bottom through holes are opened at the bottom of the box groove, and a lower permeable stone slab is placed at the bottom of the inner side of the box groove.

[0008] Furthermore, a dovetail plate is slidably installed at the bottom of the frame, the first hydraulic rod is fixedly installed at the bottom of the dovetail plate, limit plates are provided on both sides of the dovetail plate, and a controller is fixedly installed on the side wall of the frame.

[0009] Furthermore, roller support plates are symmetrically fixedly installed on both sides of the inner wall of the folding plate groove, and several side pillars are fixedly installed on both sides of the box groove. Rollers are rotatably installed on the outer ends of the side pillars, and the bottom of the rollers abuts against the upper side of the roller support plate.

[0010] Furthermore, the roller support plate is provided with a number of perforations evenly distributed.

[0011] Furthermore, a number of drainage holes are evenly distributed in the middle of the folding plate groove, a support leg is fixedly installed at the bottom of the folding plate groove, and a first support and a second support are symmetrically fixedly installed at both ends of the folding plate groove.

[0012] Furthermore, an abutment post is fixedly installed on the inner side of the first support, an abutment plate is provided at the end of the abutment post, and several pressure sensors are fixedly installed between the abutment post and the abutment plate.

[0013] Furthermore, a second hydraulic rod is fixedly installed on the inner side of the second support, and a push plate is fixedly installed on the output end of the second hydraulic rod.

[0014] Furthermore, both the first and second supports are provided with reinforcing ribs on their back sides.

[0015] Compared with related technologies, the shear apparatus for testing the shear strength of soft soil proposed in this utility model has the following advantages:

[0016] In this invention, a shear tester for soft soil shear strength testing, through a shear strength testing component, applies pressure to the soil sample by using a valve plate to drive an upper permeable stone slab. The soil sample located inside the box groove and frame is squeezed, and the water in the soil sample is filtered through the lower and upper permeable stone slabs, subsequently draining out through the bottom through-hole on the lower side and the upper drainage hose, respectively. The water filtered by the permeable stone slabs does not carry silt, keeping the platform clean. It then flows into the folding plate groove and falls through the drainage hole at the bottom of the folding plate groove into a collection tank. This invention provides a complete filtration and drainage path for soil sample shear testing, keeping the platform clean, facilitating subsequent testing, reducing the workload of staff, and enhancing practicality. Attached Figure Description

[0017] Figure 1 A three-dimensional structural diagram of a shear apparatus for testing the shear strength of soft soil proposed in this utility model. Figure 1 ;

[0018] Figure 2 A three-dimensional structural diagram of a shear apparatus for testing the shear strength of soft soil proposed in this utility model. Figure 2 ;

[0019] Figure 3 This is a partial three-dimensional structural diagram of a shear apparatus for testing the shear strength of soft soil proposed in this utility model;

[0020] Figure 4 A three-dimensional structural diagram of the shear strength testing component;

[0021] Figure 5 This is a schematic diagram of the three-dimensional cross-sectional structure of the shear strength testing component.

[0022] In the diagram: 1. Support leg; 2. Folding plate groove; 3. Water collection tank; 4. Frame; 41. Dovetail plate; 5. Shear strength test assembly; 51. Box groove; 52. Upper sleeve frame; 53. Valve plate; 54. First hydraulic rod; 55. Side support column; 56. Roller; 57. Bottom through hole; 58. Lower permeable stone slab; 59. Upper permeable stone slab; 510. Drain hose; 6. Controller; 7. First support; 8. Second support; 9. Roller support plate; 10. Drain hole; 11. Abutment column; 12. Pressure sensor; 13. Abutment plate; 14. Second hydraulic rod; 15. Push plate; 16. Drain hole. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Reference Figures 1-5 A shear tester for testing the shear strength of soft soil includes a folded plate groove 2, a water collection groove 3 placed at the bottom of the folded plate groove 2, a frame 4 fixedly installed on the upper side of the folded plate groove 2, and a shear strength testing component 5 for testing soft soil set at the bottom of the frame 4; the shear strength testing component 5 includes a box groove 51, an upper sleeve frame 52, a valve plate 53 and a first hydraulic rod 54, the output end of the first hydraulic rod 54 is fixedly connected to the valve plate 53, an upper permeable stone slab 59 is fixedly installed at the bottom of the valve plate 53, the upper permeable stone slab 59 slides in contact with the inner wall of the upper sleeve frame 52, a number of drainage hoses 510 are evenly distributed and connected on the side wall of the valve plate 53, the inner end of the drainage hoses 510 extends to the upper side of the upper permeable stone slab 59, a number of bottom through holes 57 are opened at the bottom of the box groove 51, and a lower permeable stone slab 58 is placed at the bottom of the inner side of the box groove 51.

[0025] In this method, a number of drainage holes 16 are evenly distributed in the middle of the folding plate groove 2, a support leg 1 is fixedly installed at the bottom of the folding plate groove 2, and a first support 7 and a second support 8 are symmetrically fixedly installed at both ends of the folding plate groove 2. Reinforcing ribs are provided on the back of both the first support 7 and the second support 8.

[0026] With the above-mentioned arrangement, the reinforcing ribs on the back of both the first support 7 and the second support 8 improve the lateral support strength of the first support 7 and the second support 8.

[0027] In this method, an abutment post 11 is fixedly installed on the inner side of the first support 7, an abutment plate 13 is provided at the end of the abutment post 11, and a number of pressure sensors 12 are fixedly installed between the abutment post 11 and the abutment plate 13. A second hydraulic rod 14 is fixedly installed on the inner side of the second support 8, and a push plate 15 is fixedly installed on the output end of the second hydraulic rod 14.

[0028] With the above setup, during testing, controller 6 controls the first hydraulic rod to apply a preset output pressure value, causing valve plate 53 to press down. This, in turn, activates the upper permeable stone slab 59 to pressurize the soil sample filled into the box groove 51 and the inner side of the upper frame 52. Subsequently, controller 6 controls the second hydraulic rod 14 to drive the push plate 15 to apply a lateral thrust to the box groove 51, pushing the box groove 51 towards the abutment post 11. At this time, the shear surface of the soil sample is the interface between the bottom surface of the upper frame 52 and the top surface of the box groove 51, while the abutment plate 13 abuts against the side of the upper frame 52. According to the principle that the action and reaction forces are equal, the shear surface of the soil sample is located at the abutment post 11. The combined force detected by several pressure sensors 12 between plate 13 and abutting column 11 is equal to the shear force of the soil sample. By controlling the first hydraulic rod 54 to apply different pressure values, the corresponding shear force is obtained. The controller 6 draws a relationship graph between the pressure applied and the shear force based on the pressure values ​​of multiple sets of first hydraulic rods 54, which is used for subsequent shear strength calculation. The calculation is performed using a fitting equation (this calculation process is an existing technical means for soil sample shear force calculation, and will not be described in detail here). It should also be noted that the hydraulic rod is a common existing device, and its pressure value can be accurately controlled by the controller.

[0029] In this configuration, a dovetail plate 41 is slidably mounted on the bottom of the frame 4, a first hydraulic rod 54 is fixedly mounted on the bottom of the dovetail plate 41, limit plates are provided on both sides of the dovetail plate 41, and a controller 6 is fixedly mounted on the side wall of the frame 4.

[0030] With the above configuration, the lateral abutment force of the upper part of the shear strength test assembly 5 is provided by the abutment plate 13, while the connection point of the upper part of the first hydraulic rod 54 does not provide lateral support, and the lateral abutment force caused by the sliding friction of the dovetail plate 41 is small and can be ignored.

[0031] In this method, roller support plates 9 are symmetrically fixedly installed on both sides of the inner wall of the folding plate groove 2, and several side pillars 55 are fixedly installed on both sides of the box groove 51. Rollers 56 are rotatably installed on the outer ends of the side pillars 55, and the bottom of the rollers 56 abuts against the upper side of the roller support plates 9.

[0032] With the above-described configuration, the roller 56 is designed so that the box groove 51 moves as a roller under the pushing action, resulting in low friction.

[0033] In this method, several perforations 10 are evenly distributed on the roller support plate 9.

[0034] With the above-mentioned arrangement, the drain hole 10 is used to guide the water that falls onto the roller support plate 9 to the bottom of the folding plate groove 2, and then the water flows from the drain hole 16 at the bottom of the folding plate groove 2 into the water collection tank 3.

[0035] The working principle of the shear apparatus for testing the shear strength of soft soil provided by this utility model is as follows:

[0036] I. Preparations before the test

[0037] The soft soil sample is filled into the box groove 51 and the inner side of the upper frame 52 to ensure that the soil sample is filled evenly and densely to ensure the accuracy of the test results. The water collection tank 3 is placed at the bottom of the folding plate groove 2 to collect the water discharged during the test. The controller 6 is used to initialize the first hydraulic rod 54 and the second hydraulic rod 14 and set the relevant parameters required for the test.

[0038] II. Pressure Application Process

[0039] Activate controller 6 to control the first hydraulic rod 54 to apply downward pressure according to the preset output pressure value. The output end of the first hydraulic rod 54 drives the valve plate 53 to move downward. The upper permeable stone plate 59 at the bottom of the valve plate 53 then applies downward pressure to the soil sample in the box trough 51 and the upper frame 52. During the pressure application, the soil sample is squeezed, and the water in it is filtered through the upper permeable stone plate 59 and the lower permeable stone plate 58 respectively. The water filtered by the upper permeable stone plate 59 is discharged through the evenly distributed and connected drainage hoses 510 on the side wall of the valve plate 53. The water filtered by the lower permeable stone plate 58 is discharged from the bottom through hole 57 at the bottom of the box trough 51. This discharged water flows into the folding plate groove 2 and finally falls into the water collection tank 3 through the drainage hole 16 at the bottom of the folding plate groove 2 for collection, thereby keeping the experimental table surface clean and avoiding adverse effects of water on the experimental environment and equipment.

[0040] III. Shearing Process

[0041] After the first hydraulic rod 54 completes the pressure application, the controller 6 controls the second hydraulic rod 14 to start. The output end of the second hydraulic rod 14 drives the push plate 15 to apply a lateral thrust to the box groove 51. The rollers 56 on both sides of the box groove 51 roll on the roller support plate 9, causing the box groove 51 to move towards the abutment post 11. At this time, the shear surface of the soil sample is the interface between the bottom surface of the upper frame 52 and the top surface of the box groove 51. The abutment plate 13 abuts against the side of the upper frame 52. According to the principle that the action force and reaction force are equal, the pressure sensors 12 located between the abutment plate 13 and the abutment post 11 can detect the resultant force value in real time. The magnitude of the resultant force value is equal to the magnitude of the shear force on the soil sample.

[0042] IV. Data Processing

[0043] During the test, the controller 6 records in real time the different pressure values ​​applied by the first hydraulic rod 54 and the corresponding shear force detected by the pressure sensor 12. After the test, the controller 6 plots a relationship graph between the applied pressure and the shear force based on the recorded data of multiple sets of pressure values ​​and shear force of the first hydraulic rod 54. Using existing soil sample shear force calculation techniques, the data in the relationship graph is analyzed and calculated by fitting equations to obtain relevant mechanical parameters such as the shear strength of soft soil, providing key data support for the assessment of engineering problems in civil engineering, geological exploration, and other fields.

[0044] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A shear apparatus for testing the shear strength of soft soil, characterized in that, Includes a folded plate groove (2), a water collection trough (3) is placed at the bottom of the folded plate groove (2), a frame (4) is fixedly installed on the upper side of the folded plate groove (2), and a shear strength testing component (5) for soft soil testing is provided at the bottom of the frame (4). The shear strength testing assembly (5) includes a box groove (51), an upper frame (52), a valve plate (53), and a first hydraulic rod (54). The output end of the first hydraulic rod (54) is fixedly connected to the valve plate (53). An upper permeable stone slab (59) is fixedly installed at the bottom of the valve plate (53). The upper permeable stone slab (59) slides in contact with the inner wall of the upper frame (52). Several drainage hoses (510) are evenly distributed and connected on the side wall of the valve plate (53). The inner end of the drainage hose (510) extends to the upper side of the upper permeable stone slab (59). Several bottom through holes (57) are opened at the bottom of the box groove (51). A lower permeable stone slab (58) is placed at the bottom of the inner side of the box groove (51).

2. The shear apparatus for testing the shear strength of soft soil according to claim 1, characterized in that, A dovetail plate (41) is slidably installed at the bottom of the frame (4), the first hydraulic rod (54) is fixedly installed at the bottom of the dovetail plate (41), limit plates are provided on both sides of the dovetail plate (41), and a controller (6) is fixedly installed on the side wall of the frame (4).

3. The shear apparatus for testing the shear strength of soft soil according to claim 1, characterized in that, Roller support plates (9) are symmetrically fixed on both sides of the inner wall of the folding plate groove (2). Several side pillars (55) are fixedly installed on both sides of the box groove (51). Rollers (56) are rotatably installed on the outer ends of the side pillars (55). The bottom of the rollers (56) abuts against the upper side of the roller support plates (9).

4. A shear apparatus for testing the shear strength of soft soil according to claim 3, characterized in that, The roller support plate (9) is provided with several holes (10) evenly distributed on it.

5. A shear apparatus for testing the shear strength of soft soil according to claim 1, characterized in that, The folding plate groove (2) has several drainage holes (16) evenly distributed in the middle. The bottom of the folding plate groove (2) is fixedly installed with a support leg (1). The two ends of the folding plate groove (2) are symmetrically fixedly installed with a first support (7) and a second support (8).

6. A shear apparatus for testing the shear strength of soft soil according to claim 5, characterized in that, An abutment post (11) is fixedly installed on the inner side of the first support (7), and an abutment plate (13) is provided at the end of the abutment post (11). Several pressure sensors (12) are fixedly installed between the abutment post (11) and the abutment plate (13).

7. A shear apparatus for testing the shear strength of soft soil according to claim 5, characterized in that, The second support (8) has a second hydraulic rod (14) fixedly installed on its inner side, and a push plate (15) is fixedly installed on the output end of the second hydraulic rod (14).

8. A shear apparatus for testing the shear strength of soft soil according to claim 5, characterized in that, The back of both the first support (7) and the second support (8) are provided with reinforcing ribs.

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