Ring shear test and soil sample preparation device for vertical shear surface

Abstract

The invention discloses a ring shear test and soil sample preparation device for a vertical shear surface, which comprises a test bed, a bracket, a soil sample uniform feeding mechanism, a sliding sample feeding mechanism and a test mechanism, the bracket is fixedly arranged on the test bed, a soil sample hopper is fixedly arranged above one side of the bracket, and first electric telescopic rods are symmetrically and fixedly arranged on one side above the bracket; the telescopic end of the first electric telescopic rod is fixedly provided with a first lifting frame, the middle of the first lifting frame is fixedly provided with a first motor, the output end of the first motor drives a rotating shaft, the lower end of the rotating shaft is fixedly provided with a rotating disc, the bottom of the rotating disc is fixedly provided with material uniformizing needles, the test bed is provided with a sliding sample feeding mechanism, and the other side of the support is provided with a test mechanism. The first motor drives the rotating disc to rotate to drive the material uniformizing needle to synchronously rotate to stir and stir a soil sample, the uniformity of the soil sample in the soil sample box is effectively guaranteed, and the second motor drives the screw to rotate to be in threaded fit with the threaded sleeve to drive the fixing disc and the soil sample box to horizontally slide along the sliding rail, so that the soil sample is conveniently prepared.

Description

Technical Field

[0001] The invention relates to the technical field of ring shear test equipment, and in particular to a ring shear test and soil sample preparation device for a vertical shear surface. Background Art

[0002] The ring shear test is a test method used to study the mechanical properties of soil. The ring shear test is a type of torsion shear test. By applying torque to the annular soil sample, it causes shear deformation on the annular shear surface to simulate the shear state of the soil in actual engineering. The test assumes that the normal stress and shear stress on the shear surface are uniformly distributed. By measuring parameters such as torque and angular displacement, the shear stress and shear strain are calculated to study the shear strength, deformation characteristics, and strength attenuation law of the soil. In the vertical shear surface ring shear test, the normal direction of the shear surface is perpendicular to the direction of the shear angular velocity vector;

[0003] The invention patent with application number 201710235660.1 discloses a ring shear test and soil sample preparation device suitable for vertical shear surface. The lifting system can realize large displacement shearing and keep the shear area unchanged, while ensuring the uniform distribution of shear displacement and shear stress on the shear surface. The vertical shear surface is formed by rotating multiple shear plates to control the uniform formation of the vertical shear failure surface during the shearing process, which can avoid the phenomenon of uneven destruction of the shear surface soil during the shearing process caused by too few shear plates or uneven layout. The computer can receive and store monitoring data in real time; by receiving the monitoring data fed back by the torque sensor, the motor can be given relevant instructions in time to achieve torque control; by receiving the monitoring data fed back by the angular displacement sensor, the motor can be given relevant instructions in time to achieve displacement control; By receiving the monitoring data fed back by the soil pressure gauge, the hydraulic lifting platform is servo-controlled in time to adjust the loading and unloading of the sample, so as to ensure that the positive pressure on the vertical shear surface remains unchanged during the sample shearing process: the soil sample preparation system can be automatically controlled to automate the sample preparation process, and the semi-cylindrical guard plate is guided by the floor guide rail group, which can make the movement of the semi-cylindrical guard plate easy and convenient, and can also make the clutch guidance of the left and right guard plates more accurate during the sample preparation process. The soil sample preparation system prepared by the test soil sample is symmetrically distributed along the left and right directions with respect to the cylindrical shear box, and the frame of the vertical ring shear test is symmetrically distributed along the front and back directions with respect to the cylindrical shear box, so that the sample preparation link and the test link do not interfere with each other, and are used together to form a complete test operation system, which has the functions of sample preparation and vertical shear test;

[0004] However, when making soil samples in the above-mentioned ring shear test and soil sample preparation device suitable for vertical shear surface, the semi-circular guard plates cannot be further squeezed after being combined, so that the uniformity and density of the soil samples cannot be controlled, and the amount of soil samples cannot be accurately controlled manually, which can easily affect the data accuracy of the ring shear test. In the above-mentioned ring shear test and soil sample preparation device suitable for vertical shear surface, the semi-cylindrical guard plates need to be opened before the test to facilitate the shear box cover to descend to cover the soil sample for the test, which can easily cause the edge of the soil sample to fall off and affect the accuracy of the test data. Therefore, the present invention proposes a ring shear test and soil sample preparation device for vertical shear surface to solve the problems existing in the prior art. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to propose a ring shear test and soil sample preparation device for vertical shear surface, in which the first electric telescopic rod is extended to drive the first lifting frame to descend, and then the material mixing needle is inserted into the soil sample. The first motor drives the turntable to rotate and drives the material mixing needle to rotate synchronously to stir the soil sample, thereby effectively ensuring the uniformity of the soil sample in the soil sample box and the accuracy of the test value. The second motor drives the screw to rotate and cooperates with the thread of the threaded sleeve to drive the fixed plate and the soil sample box to slide horizontally along the slide rail, so that the soil is placed in the soil body to make the soil sample and then test it, thereby effectively improving the integration of the device.

[0006] To achieve the purpose of the present invention, the present invention is implemented through the following technical scheme: a ring shear test and soil sample preparation device for a vertical shear surface, comprising a test bench, a bracket, a soil sample uniform feeding mechanism, a sliding sample feeding mechanism and a test mechanism, the test bench is fixedly provided with a bracket, the soil sample uniform feeding mechanism comprises a soil sample bucket, a first electric telescopic rod, a first lifting frame, a first motor, a rotating shaft, a turntable and a material leveling needle, a soil sample bucket is fixedly provided on the upper side of one side of the bracket, a first electric telescopic rod is symmetrically fixedly provided on the upper side of the bracket, a first lifting frame is fixedly provided on the telescopic end of the first electric telescopic rod, a first motor is fixedly provided in the middle of the first lifting frame, a rotating shaft is driven at the output end of the first motor, a turntable is fixedly provided at the lower end of the rotating shaft, a material leveling needle is arranged and fixedly provided at the bottom of the turntable, a sliding sample feeding mechanism is provided on the test bench, and a test mechanism is provided on the other side of the bracket.

[0007] A further improvement is that: the material leveling needles are arranged in multiple groups transversely, and the lower end of the soil sample bucket is inclined to discharge the material.

[0008] Further improvements are: the sliding sample feeding mechanism includes a slide rail, a slider, a fixed plate, a soil sample box, a screw, a second motor and a threaded sleeve; the test bench is symmetrically fixed with slide rails in the front and back; the slide rails are matched with slide blocks for sliding sliding; a fixed plate is fixed above the sliders; a soil sample box is rotatably provided on the fixed plate; a screw is rotatably provided in the middle of the test bench; a second motor is fixedly provided at the bottom of one side of the bracket; a threaded sleeve is fixed in the middle of the bottom of the fixed plate; and a test mechanism is provided on the outside of the soil sample box.

[0009] A further improvement is that the output end of the second motor is connected to a screw rod, the screw rod thread fits through a threaded sleeve, and the turntable corresponds to the soil sample box.

[0010] A further improvement is that the test mechanism includes a second electric telescopic rod, a second lifting frame, a shear plate, a pressure plate, a gear ring, a third motor and a gear; a second electric telescopic rod is symmetrically fixed on the other side of the bracket; a second lifting frame is fixed on the telescopic end of the second electric telescopic rod; a shear plate is fixed around the bottom of the second lifting frame; a pressure plate is fixed between the shear plates; a gear ring is fixed around the outer lower part of the soil sample box; a third motor is fixed at the lower part of the other side of the bracket; and a gear is fixed at the output end of the third motor.

[0011] A further improvement is that: the gear is meshed with the gear ring for transmission, and the second lifting frame corresponds to the position of the soil sample box.

[0012] A further improvement is that an angle displacement sensor is fixedly provided on one side of the soil sample box, and pressure sensors are arranged and fixedly provided on the shear plate.

[0013] A further improvement is that a drainage groove is provided in the middle of the bottom of the soil sample box, a drainage pipe is provided below the drainage groove, and the lower end of the drainage pipe extends out from the bottom of the soil sample box.

[0014] The beneficial effects of the present invention are as follows: the present invention extends the first electric telescopic rod to drive the first lifting frame to descend, and then the material mixing needle is inserted into the soil sample. The first motor drives the turntable to rotate, which drives the material mixing needle to rotate synchronously to stir the soil sample, effectively ensuring the uniformity of the soil sample in the soil sample box and the accuracy of the test values. The second motor drives the screw to rotate and cooperates with the thread of the threaded sleeve to drive the fixed plate and the soil sample box to slide horizontally along the slide rail, so that the soil is placed in the soil body to make the soil sample and then test it, which effectively improves the integration degree of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an overall front cross-sectional view of the present invention;

[0016] Figure 2 It is a front view of the soil sample box of the present invention;

[0017] Figure 3 It is an enlarged schematic diagram of point A of the present invention.

[0018] Among them: 1. test bench; 2. bracket; 3. soil sample bucket; 4. first electric telescopic rod; 5. first lifting frame; 6. first motor; 7. rotating shaft; 8. turntable; 9. material leveling needle; 10. slide rail; 11. slider; 12. fixed plate; 13. soil sample box; 14. screw; 15. second motor; 16. threaded sleeve; 17. second electric telescopic rod; 18. second lifting frame; 19. shear plate; 20. pressure plate; 21. gear ring; 22. third motor; 23. gear; 24. angle displacement sensor; 25. pressure sensor; 26. drainage trough; 27. drainage pipe. DETAILED DESCRIPTION

[0019] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with examples. The examples are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0020] During the flow of debris flow, there is a vertical shear effect between the debris and the ditch bed. Through the vertical shear surface ring shear test, the interaction between the debris flow and the ditch bed can be simulated, and the changes in the mechanical properties on the vertical shear surface during the start, movement and accumulation of the debris flow can be studied, which is for the design of debris flow prevention and control projects. During the development of ground fissures, there is a relative vertical shear movement of the soil on both sides. The vertical shear surface ring shear test can simulate the vertical shear behavior of the soil on both sides of the ground fissure, analyze the changes in the shear strength of the soil under different stress states, and provide a scientific basis for the disaster assessment of ground fissures and the formulation of prevention and control measures.

[0021] Based on this, according to Figure 1 , Figure 2 , Figure 3As shown, the present embodiment provides a ring shear test and soil sample preparation device for a vertical shear surface, including a test bench 1, a bracket 2, a soil sample uniform feeding mechanism, a sliding sample feeding mechanism and a test mechanism. The bracket 2 is fixedly provided on the test bench 1. The soil sample uniform feeding mechanism includes a soil sample bucket 3, a first electric telescopic rod 4, a first lifting frame 5, a first motor 6, a rotating shaft 7, a turntable 8 and a material leveling needle 9. A soil sample bucket 3 is fixedly provided on one side of the bracket 2, a first electric telescopic rod 4 is symmetrically fixedly provided on one side above the bracket 2, a first lifting frame 5 is fixedly provided on the telescopic end of the first electric telescopic rod 4, a first motor 6 is fixedly provided in the middle of the first lifting frame 5, a rotating shaft 7 is provided at the output end of the first motor 6, and a rotating shaft 7 is fixedly provided at the lower end of the rotating shaft 7 The turntable 8 is provided with a material mixing needle 9 which is arranged and fixed at the bottom. The material mixing needle 9 is arranged in a transverse direction in a plurality of groups. The lower end of the soil sample bucket 3 is inclined to discharge the material. When preparing the soil sample, the soil sample box 13 is first located on one side of the test bench 1, and the soil sample bucket 3 guides the soil sample to fall into the soil sample box 13. When mixing the material, the first electric telescopic rod 4 is extended to push the first lifting frame 5 down, so that the material mixing needle 9 is inserted into the soil sample, and then the first electric drive shaft 7 and the turntable 8 are rotated to drive the material mixing needle 9 to stir the soil sample, thereby effectively improving the uniformity of the soil sample in the soil sample box 13, solving the problem of being unable to control the uniformity of the soil sample, and effectively improving the data accuracy of the ring shear test. The test bench 1 is provided with a sliding sample feeding mechanism, and the other side of the bracket 2 is provided with a test mechanism.

[0022] The sliding sample feeding mechanism includes a slide rail 10, a slider 11, a fixed plate 12, a soil sample box 13, a screw 14, a second motor 15 and a threaded sleeve 16. The slide rail 10 is symmetrically fixed on the test bench 1, and a slider 11 is slidingly provided on the slide rail 10. A fixed plate 12 is fixed above the slider 11, and a soil sample box 13 is rotatably provided on the fixed plate 12. A screw 14 is rotatably provided in the middle of the test bench 1, and a second motor 15 is fixed at the bottom of one side of the bracket 2. A threaded sleeve 16 is fixed in the middle of the bottom of the fixed plate 12. A test mechanism is provided on the outside of the sample box 13. The output end of the second motor 15 is connected to the screw 14. The screw 14 threadedly fits through the threaded sleeve 16. The turntable 8 corresponds to the position of the soil sample box 13. After the soil sample is fed, the screw 14 is driven to rotate by the second motor 15. The threaded fit of the screw 14 and the threaded sleeve 16 drives the fixed plate 12 and the slider 11 to slide along the slide rail 10, so that the soil sample box 13 moves horizontally to the other side of the test bench 1, which is convenient for smooth movement between the loading station and the test station, and effectively improves the test efficiency.

[0023] The test mechanism includes a second electric telescopic rod 17, a second lifting frame 18, a shear plate 19, a pressure plate 20, a gear ring 21, a third motor 22 and a gear 23. The second electric telescopic rod 17 is symmetrically fixed on the other side of the bracket 2. The second lifting frame 18 is fixed on the telescopic end of the second electric telescopic rod 17. The shear plate 19 is fixed around the bottom of the second lifting frame 18. The pressure plate 20 is fixed between the shear plates 19. The gear ring 21 is fixed around the outer bottom of the soil sample box 13. The third motor 22 is fixed at the bottom of the other side of the bracket 2. The output end of the third motor 22 is fixed with a gear. Gear 23, gear 23 is meshed with gear ring 21 for transmission, second lifting frame 18 second lifting frame 18 corresponds to the position of soil sample box 13, when the test is carried out, after the soil sample box 13 is horizontally moved to the other side of the test bench 1, the second electric telescopic rod 17 is extended to drive the second lifting frame 18 to descend so that the shear plate 19 is inserted into the soil sample, and at the same time, the pressing plate 20 is pressed down to generate vertical pressure on the soil sample, simulating the stress state of the soil in the actual project, and then the third motor 22 drives the gear 23 to rotate and mesh with the gear ring 21 to drive the soil sample box 13 to rotate on the fixed plate 12 for shear test.

[0024] An angle displacement sensor 24 is fixedly provided on one side of the soil sample box 13 , and a pressure sensor 25 is arranged and fixedly provided on the shear plate 19 . The angle displacement sensor 24 senses the rotational angle change of the soil sample box 13 , and the pressure sensor 25 senses the pressure change on the shear plate 19 .

[0025] A drainage groove 26 is provided in the middle of the bottom of the soil sample box 13, and a drainage pipe 27 is provided below the drainage groove 26. The lower end of the drainage pipe 27 extends out from the bottom of the soil sample box 13. When the pressing plate 20 descends to squeeze the soil, the moisture inside it will be squeezed out. The squeezed moisture can be quickly discharged through the drainage groove 26 and the drainage pipe 27, effectively preventing the moisture from affecting the accuracy of the test.

[0026] In the ring shear test and soil sample preparation device for vertical shear surface, when preparing soil samples, the second motor first drives the screw rod to reverse and cooperate with the threaded sleeve to drive the fixed plate and the soil sample box to move to one side of the test bench so that the soil poured into the soil sample bucket can fall into the soil sample box, and then the first electric telescopic rod is extended to drive the first lifting frame to descend so that the material mixing needle is inserted into the soil sample, the first motor is started to drive the rotating shaft and the rotating disk to rotate, and the material mixing needle is driven to stir and stir the soil sample in the soil sample box to ensure the uniformity of the soil sample in the soil sample box, and after the feeding is completed, the first electric telescopic rod is retracted to drive the first lifting frame to rise The second motor drives the screw to rotate through the threaded sleeve to drive the fixed plate and the soil sample box to slide horizontally along the slide rail to the other side of the test bench for testing. During the test, the second electric telescopic rod extends to drive the second lifting frame to descend so that the shear plate is inserted into the soil sample. At the same time, the pressure plate descends synchronously to compact the soil sample to simulate the engineering environment. The third motor drives the gear to rotate through engagement with the gear ring to drive the soil sample box to rotate on the fixed plate to generate pressure on the shear plate. The angle rotation change of the soil sample box is sensed by the angle displacement sensor, and the pressure sensor senses the pressure on the shear plate when the soil sample box drives the soil sample to rotate.

[0027] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A ring shear test and soil sample preparation device for vertical shear surface, characterized in that: The invention comprises a test bench (1), a support (2), a soil sample uniform feeding mechanism, a sliding sample feeding mechanism and a test mechanism. The support (2) is fixedly provided on the test bench (1). The soil sample uniform feeding mechanism comprises a soil sample bucket (3), a first electric telescopic rod (4), a first lifting frame (5), a first motor (6), a rotating shaft (7), a rotating disk (8) and a material leveling needle (9). A soil sample bucket (3) is fixedly provided on one side of the support (2). A first electric telescopic rod (4) is symmetrically fixedly provided on one side of the support (2). A first lifting frame (5) is fixedly provided at the telescopic end of the first electric telescopic rod (4). A first motor (6) is fixedly provided in the middle of the first lifting frame (5). A rotating shaft (7) is provided at the output end of the first motor (6) for driving. A rotating disk (8) is fixedly provided at the lower end of the rotating shaft (7). Material leveling needles (9) are arranged and fixedly provided at the bottom of the rotating disk (8). The test bench (1) is provided with a sliding sample feeding mechanism. The test mechanism is provided on the other side of the support (2).

2. A ring shear test and soil sample preparation device for vertical shear surface according to claim 1, characterized in that: The material leveling needles (9) are arranged in a plurality of groups in a transverse arrangement, and the lower end of the soil sample bucket (3) is inclined to discharge the material.

3. The device for ring shear test and soil sample preparation for vertical shear surface according to claim 1, characterized in that: The sliding sample feeding mechanism comprises a slide rail (10), a slider (11), a fixed plate (12), a soil sample box (13), a screw (14), a second motor (15) and a threaded sleeve (16); the slide rail (10) is symmetrically fixedly provided on the test bench (1) in the front and rear directions; the slide rail (10) is matched with a slider (11) for sliding; a fixed plate (12) is fixedly provided above the sliders (11); a soil sample box (13) is rotatably provided on the fixed plate (12); a screw (14) is rotatably provided in the middle of the test bench (1); a second motor (15) is fixedly provided at the bottom of one side of the bracket (2); a threaded sleeve (16) is fixedly provided in the middle of the bottom of the fixed plate (12); and a test mechanism is provided on the outside of the soil sample box (13).

4. A ring shear test and soil sample preparation device for vertical shear surface according to claim 3, characterized in that: The output end of the second motor (15) is drivingly connected to the screw rod (14), the screw rod (14) is threadedly matched to pass through the threaded sleeve (16), and the rotating disk (8) corresponds to the position of the soil sample box (13).

5. The device for ring shear test and soil sample preparation for vertical shear surface according to claim 3, characterized in that: The test mechanism comprises a second electric telescopic rod (17), a second lifting frame (18), a shear plate (19), a pressure plate (20), a gear ring (21), a third motor (22) and a gear (23); the second electric telescopic rod (17) is symmetrically fixed on the other side of the bracket (2); the second lifting frame (18) is fixed on the telescopic end of the second electric telescopic rod (17); a shear plate (19) is fixed around the bottom of the second lifting frame (18); a pressure plate (20) is fixed between the shear plates (19); a gear ring (21) is fixed around the outer lower part of the soil sample box (13); a third motor (22) is fixed at the lower part of the other side of the bracket (2); and a gear (23) is fixed at the output end of the third motor (22).

6. A ring shear test and soil sample preparation device for vertical shear surface according to claim 5, characterized in that: The gear (23) is meshed with the gear ring (21) for transmission, and the second lifting frame (18) corresponds to the position of the soil sample box (13).

7. The device for ring shear test and soil sample preparation for vertical shear surface according to claim 5, characterized in that: An angle displacement sensor (24) is fixedly provided on one side of the soil sample box (13), and pressure sensors (25) are arranged and fixedly provided on the shear plate (19).

8. The device for ring shear test and soil sample preparation for vertical shear surface according to claim 3, characterized in that: A drainage groove (26) is provided in the middle of the bottom of the soil sample box (13), a drainage pipe (27) is provided below the drainage groove (26), and the lower end of the drainage pipe (27) extends out from the bottom of the soil sample box (13).

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