Portable in-situ rock-soil shear strength tester

Abstract

The utility model discloses a portable in-situ rock-soil shear strength tester, which relates to the technical field of rock-soil shear test, and comprises a triangular steel plate and a vertical steel pipe, a steel sleeve is fixed at the edge position of the triangular steel plate, the inner surface of the steel sleeve is rotatably connected with a pointed-end screw through threads, and the pointed-end screw is fixedly connected with the vertical steel pipe. The surface of the triangular steel plate is provided with a connecting groove, the inner surface of the connecting groove is connected with a bearing in a clamped mode, the interior of the bearing is connected with a connecting rod, the surface of the connecting rod is fixedly provided with a driving round wheel, and the upper end of the connecting rod is fixedly provided with a torque sensor. Torque data and displacement data are obtained through the torque sensor and the linear speed meter counting sensor on the surface of the shearing device, so that the shearing stress of the rock-soil body is calculated according to a formula, rapid testing and testing efficiency of the shearing strength of the in-situ rock-soil body are achieved, and meanwhile the pointed-end screw, the triangular steel plate and the shearing device can be detached and are convenient to carry outdoors.

Description

Technical Field

[0001] The utility model relates to the technical field of rock and soil shear resistance testing, in particular to a portable in-situ rock and soil shear strength testing instrument. Background Art

[0002] Rock and soil layers are widely distributed on the earth's surface in nature. They will soften under rainfall or artificial irrigation, resulting in a decrease in shear strength, which can easily lead to frequent geological disasters such as landslides, mudslides and slope erosion. In order to understand the shear strength of rock and soil and serve engineering design, it is necessary and essential to carry out shear strength testing of rock and soil.

[0003] At present, the method for testing the shear strength of rock and soil is usually to take samples in situ and then take them to the indoor direct shear test or triaxial test method; however, taking the rock and soil samples from the site will lead to stress release and disturbance of the rock and soil structure, which often makes the test results obtained by the indoor direct shear test or triaxial test less convincing than the in-situ test method. Therefore, an in-situ rock and soil shear strength tester is proposed to improve the efficiency and accuracy of the in-situ rock and soil shear strength test. Utility Model Content

[0004] The utility model provides a portable in-situ rock and soil shear strength tester, which solves the above technical problems.

[0005] In order to solve the above technical problems, the utility model provides a portable in-situ rock and soil shear strength tester, comprising a triangular steel plate and a vertical steel pipe, a shearer, a steel sleeve is fixed at the edge of the triangular steel plate, and the inner surface of the steel sleeve is connected to a pointed screw by a threaded rotation, and the shearer comprises a T-shaped handle, a torque sensor, a connecting rod, a driving round wheel, a shear blade, and a bearing;

[0006] The surface of the triangular steel plate is provided with a connecting groove, the inner surface of the connecting groove is clamped with a bearing, the inside of the bearing is connected with a connecting rod, a driving circular wheel is fixed to the surface of the connecting rod, a torque sensor is fixed to the upper end of the connecting rod, a T-shaped handle is fixed to the upper end of the torque sensor, a shearing blade is fixed to the lower end of the connecting rod, a transmission circular wheel is connected to the surface of the driving circular wheel, a linear speed meter sensor is connected to the upper end of the transmission circular wheel, the shearer and the linear speed meter sensor are connected to a collector through lines, the collector is connected to a computer through lines, and a blade with a blade is fixed to the lower end of the vertical steel pipe.

[0007] Preferably, a circular level bubble is provided on the surface of the triangular steel plate, and a round ball is fixed to the upper end of the pointed screw.

[0008] Preferably, the collector and the computer are connected to a power source via a line, and a Z-shaped bracket is connected to the surface of the linear speed meter sensor.

[0009] Preferably, the bottom of the blade with an edge is a pointed end, and a top disc is fixed to the upper end of the vertical steel pipe.

[0010] Compared with the related art, the portable in-situ rock and soil shear strength tester provided by the utility model has the following beneficial effects:

[0011] The utility model builds a test platform through a triangular steel plate, obtains torque data and displacement data through a torque sensor and a linear speed meter sensor on the surface of the shearer, thereby calculating the shear stress of the rock and soil body according to a formula, thereby achieving rapid and efficient testing of the shear strength of the in-situ rock and soil body; meanwhile, the pointed screw, the triangular steel plate and the shearer can be dismantled for easy carrying in the field. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the main structure diagram of the utility model;

[0013] Figure 2 This is a structural diagram of the shear in the utility model;

[0014] Figure 3 This is a structural diagram of the test slot maker in the utility model.

[0015] Numbers in the figure: 1. pointed screw; 2. steel sleeve; 3. triangular steel plate; 4. circular level bubble; 5. connecting groove; 6. shear; 7. linear speed meter sensor; 8. transmission round wheel; 9. collector; 10. power supply; 11. computer; 61. T-shaped handle; 62. torque sensor; 63. connecting rod; 64. driving round wheel; 65. shear blade; 66. bearing; 12. test slot maker; 121. top disc; 122. vertical steel pipe; 123. blade with blade. DETAILED DESCRIPTION

[0016] Example, by Figure 1-3 The utility model includes a portable in-situ rock and soil shear strength tester, including a triangular steel plate 3 and a vertical steel pipe 122, a shearer 6, a steel sleeve 2 is fixed at the edge of the triangular steel plate 3, and a pointed screw 1 is connected to the inner surface of the steel sleeve 2 by threaded rotation, and the shearer 6 includes a T-shaped handle 61, a torque sensor 62, a connecting rod 63, a driving round wheel 64, a shear blade 65, and a bearing 66;

[0017] A connecting groove 5 is provided on the surface of the triangular steel plate 3, a bearing 66 is clamped on the inner surface of the connecting groove 5, a connecting rod 63 is connected to the inside of the bearing 66, a driving circular wheel 64 is fixed to the surface of the connecting rod 63, a torque sensor 62 is fixed to the upper end of the connecting rod 63, a T-shaped handle 61 is fixed to the upper end of the torque sensor 62, a shearing blade 65 is fixed to the lower end of the connecting rod 63, a transmission circular wheel 8 is connected to the surface of the driving circular wheel 64, a linear speed meter sensor 7 is connected to the upper end of the transmission circular wheel 8, the shearer 6 and the linear speed meter sensor 7 are connected to a collector 9 through a line, the collector 9 is connected to a computer 11 through a line, and a blade 123 with a blade is fixed to the lower end of the vertical steel pipe 122.

[0018] A circular level bubble 4 is arranged on the surface of the triangular steel plate 3 , and a round ball is fixed on the upper end of the pointed screw rod 1 .

[0019] The collector 9 and the computer 11 are connected to a power source 10 through a line, and a Z-shaped bracket is connected to the surface of the linear speed meter sensor 7.

[0020] The bottom of the blade 123 with an edge is a pointed tip, and a top disc 121 is fixed to the upper end of the vertical steel pipe 122 .

[0021] Install the pointed screw on the surface of the steel sleeve through the surface thread, so that the triangular steel plate stands up and the upper surface of the triangular steel plate remains horizontal; insert the test slot maker into the connecting slot, use a hammer to evenly hammer the top disc, vertically insert the blade with blade into the test rock and soil body to a vertical insertion depth (H) not less than the shear blade, and then pull out the test slot maker to complete the production of a test slot in the rock and soil body; insert the shear blade of the shear into the test slot in the rock and soil body to a certain vertical depth (H); the debugging collector and computer debugging software are working normally; rotate the T-shaped handle slowly and evenly by hand to drive the shear blade to shear the surrounding rock and soil bodies, so that the rock and soil bodies are sheared. The computer debugging software uses the data of the torque sensor and the linear speed meter sensor to save the torque value (M) and displacement value (S) data in real time; after the rock and soil body is sheared, pull out the shear, and the in-situ rock and soil shear strength test of a test point is completed.

[0022] After the test, assuming that the test rock and soil are basically uniform, the shear stress τ of the rock and soil can be calculated using the following formula:

[0023]

[0024] Wherein, M is the torque value;

[0025] d is the width of the shear blade 65;

[0026] H is the vertical depth of the shear blade 65 inserted into the test rock and soil body.

[0027] Based on the above formula and the torque value (M) and displacement value (S) data at different times, the shear stress (τ) and displacement value (S) curve of the test process can be drawn, and the shear stress corresponding to the peak point on the shear stress (τ) and displacement value (S) curve is the shear strength of the tested rock and soil mass.

Claims

1. A portable in-situ rock and soil shear strength tester, comprising a triangular steel plate (3), a vertical steel pipe (122), and a shearer (6), characterized in that: A steel sleeve (2) is fixed at the edge of the triangular steel plate (3), and the inner surface of the steel sleeve (2) is rotatably connected to a pointed screw rod (1) through a thread. The shear (6) comprises a T-shaped handle (61), a torque sensor (62), a connecting rod (63), a driving circular wheel (64), a shear blade (65), and a bearing (66); The surface of the triangular steel plate (3) is provided with a connection groove (5), the inner surface of the connection groove (5) is clamped with a bearing (66), the interior of the bearing (66) is connected with a connecting rod (63), the surface of the connecting rod (63) is fixed with a driving circular wheel (64), the upper end of the connecting rod (63) is fixed with a torque sensor (62), the upper end of the torque sensor (62) is fixed with a T-shaped handle (61), the lower end of the connecting rod (63) is fixed with a shearing blade (65), the surface of the driving circular wheel (64) is connected with a transmission circular wheel (8), the upper end of the transmission circular wheel (8) is connected with a linear speed meter sensor (7), the shearer (6) and the linear speed meter sensor (7) are connected to a collector (9) via a line, the collector (9) is connected to a computer (11) via a line, and the lower end of the vertical steel pipe (122) is fixed with a bladed lower inserting blade (123).

2. A portable in-situ rock and soil shear strength tester according to claim 1, characterized in that: A circular level bubble (4) is provided on the surface of the triangular steel plate (3), and a round ball is fixed to the upper end of the pointed screw rod (1).

3. A portable in-situ rock and soil shear strength tester according to claim 1, characterized in that: The collector (9) and the computer (11) are connected to a power source (10) via a line, and a Z-shaped bracket is connected to the surface of the linear speed meter sensor (7).

4. A portable in-situ rock and soil shear strength tester according to claim 1, characterized in that: The bottom of the blade (123) with an edge is a pointed tip, and a top disc (121) is fixed to the upper end of the vertical steel pipe (122).

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