A dynamic excitation type ring shear apparatus

Abstract

The application discloses a dynamic exciting ring shear apparatus, which comprises a pile body assembly, a vertical supporting device, an upper shear box and a lower shear box, and an exciting device. The vertical supporting device comprises a clamping assembly with a clamping space, and an inner annular plate and an outer annular plate are clamped by the clamping space. The contact between the inner annular plate, the outer annular plate and the clamping assembly is rolling contact. The pile body assembly can rotate horizontally in the clamping space. The upper shear box is placed on the upper surface of the annular pile body, and the lower shear box is placed on the lower surface of the annular pile body. The vertical load device comprises a vertical downward loading assembly for applying vertical pressure to the upper shear box and a vertical upward loading assembly for applying vertical pressure to the lower shear box. The exciting device is used for applying an impact force perpendicular to the vertical direction to the pile body assembly or applying a vibration force to the pile body assembly. The ring shear apparatus can not only perform a double-face normal stress loading test on the pile body, but also simulate the actual dynamic pile sinking process of the pile body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geotechnical mechanics detection, in particular to a dynamic excitation type ring shear apparatus. BACKGROUND

[0002] Pile foundation is a widely used foundation form for buildings, bridges, ports, ocean wind power and other land and water structures. When the pile foundation bears the vertical load of the upper pile head, the relative displacement or displacement trend between the pile and the soil around the pile occurs, so that the pile side friction resistance plays a role, and then the pile head load is gradually transmitted to the soil around the pile. As can be seen, the pile side friction resistance is an important part of the single pile bearing capacity, and how to determine the shear properties of the interface between the pile and the soil is a key problem in design, and is also an important mechanical problem in studying the bearing capacity and settlement of pile foundation.

[0003] The dynamic excitation type ring shear apparatus is a soil test equipment for determining the mechanical properties of soil under large shear displacement, and is commonly used for detecting the shear properties of the interface between the pile and the soil. In the conventional ring shear test, the shear area of the sample is kept unchanged under continuous displacement, and the vertical pressure and torsional shear are applied to the ring sample during the test to obtain the shear strength of the rock and soil, so as to obtain the corresponding law when the displacement changes.

[0004] The conventional dynamic excitation type ring shear apparatus can only perform shear test on a single side of the pile body, and is under continuous torsional shear, while the actual dynamic pile sinking mainly adopts impact sinking and vibration sinking, and the pile body is subjected to impact force and excitation force, rather than continuous torsional shear. At the same time, due to the soil plug, the pressure on the inner wall and the outer wall of the pile body is not the same during the sinking process. Since the conventional dynamic excitation type ring shear apparatus is difficult to simulate the actual dynamic pile sinking process, the detection result of the shear properties of the interface between the pile and the soil is inaccurate.

[0005] Therefore, it is necessary to develop a large-scale dynamic excitation type ring shear apparatus for pile-soil interface shear test of dynamic pile sinking, which can load test on the double sides of the pile body and simulate the actual dynamic pile sinking process. SUMMARY

[0006] In view of the defects in the prior art, the present application provides a dynamic excitation type ring shear apparatus to realize loading test on the double sides of the pile body and simulate the actual dynamic pile sinking process.

[0007] The present application adopts the following technical solutions:

[0008] A dynamic excitation type ring shear apparatus, comprising:

[0009] A pile body assembly, comprising a ring-shaped pile body, an inner ring-shaped plate and an outer ring-shaped plate, the inner ring-shaped plate is connected with the inner side of the ring-shaped pile body, and the outer ring-shaped plate is connected with the outer side of the ring-shaped pile body.

[0010] The vertical support device comprises a clamping assembly with a clamping space, the inner and outer annular plates are clamped by the clamping space, and the contact between the inner and outer annular plates and the clamping assembly is rolling contact, and the pile body assembly can rotate horizontally in the clamping space;

[0011] The shearing box assembly comprises an upper shearing box and a lower shearing box for placing samples to be tested, the upper shearing box is placed on the upper surface of the annular pile body, and the lower shearing box is placed on the lower surface of the annular pile body;

[0012] The vertical load device comprises a vertical downward loading assembly for applying vertical pressure to the upper shearing box and a vertical upward loading assembly for applying vertical pressure to the lower shearing box;

[0013] The excitation device is used for applying an impact force perpendicular to the vertical direction to the pile body assembly or applying a vibration force to the pile body assembly.

[0014] Further, the excitation device comprises an annular track, a first connecting rod and an exciter, the annular track is located at the periphery of the pile body assembly, the outer side of the annular track is connected with the vertical support device through the first connecting rod, the exciter is in sliding connection with the annular track, and the outer side wall of the outer annular plate is provided with a load plate, and the exciter is used for applying an impact force or a vibration force to the load plate.

[0015] Further, a force sensor is arranged on the load plate, and a laser range finder is arranged on the surface of the exciter opposite to the load plate.

[0016] Further, an angular displacement sensor for detecting the rotation angle of the pile body assembly is further included.

[0017] Further, the excitation device further comprises a pulley and a second connecting rod, the inner side of the annular track is provided with an annular sliding groove, one end of the second connecting rod is connected with the exciter, the other end of the second connecting rod is connected with the pulley, and the pulley is in sliding connection in the annular sliding groove.

[0018] Further, the vertical load device further comprises two first vertical columns, two second vertical columns, an upper vertical displacement meter and a lower vertical displacement meter, upper ends of the two first vertical columns are movably connected with a first horizontal rod, lower ends of the two second vertical columns are movably connected with a second horizontal rod, the vertical downward loading assembly is connected with the middle part of the first horizontal rod at the upper end, the vertical downward loading assembly is in contact with the top of the upper shear box at the lower end, the vertical upward loading assembly is connected with the middle part of the second horizontal rod at the lower end, the vertical upward loading assembly is in contact with the bottom of the lower shear box at the upper end, the upper vertical displacement meter is vertically arranged and the top end thereof is connected with the first vertical column through a first connecting plate, and the lower vertical displacement meter is vertically arranged and the bottom end thereof is connected with the second vertical column through a second connecting plate.

[0019] Further, the clamping assembly comprises two oppositely arranged inner fixing members and two oppositely arranged outer fixing members, the inner fixing members are located inside the outer fixing members, an annular channel is enclosed between the outer side surface of the inner fixing member and the inner side surface of the outer fixing member, the upper and lower surfaces of the inner annular plate are clamped by the two inner fixing members, the upper and lower surfaces of the outer annular plate are clamped by the two outer fixing members, and the annular pile body is located in the annular channel.

[0020] Further, the two inner fixing members are provided with inner annular fixing grooves, the two outer fixing members are provided with outer annular fixing grooves, and the inner annular fixing grooves and the outer annular fixing grooves are provided with rolling bodies for rolling contact with the surfaces of the inner annular plate and the outer annular plate.

[0021] Further, the vertical support device further comprises a plurality of lower support rods and a plurality of lifting vertical rods, the top of each lower support rod is connected with the bottom of the clamping assembly, and the lower end of each lifting vertical rod is connected with the top of the clamping assembly.

[0022] Further, the vertical support device further comprises a plurality of lower support rods and a plurality of lifting vertical rods, the top of each lower support rod is connected with the bottom of the clamping assembly, and the lower end of each lifting vertical rod is connected with the top of the clamping assembly.

[0023] Compared with the prior art, the beneficial effects of the present application at least include:

[0024] The vertical downward loading assembly applies vertical pressure to the upper shear box, and the vertical upward loading assembly applies vertical pressure to the lower shear box, so that the double-face normal stress of the ring pile body is applied, so that the change of the pile body under the action of different normal pressures is studied, and the need is beneficial. The impact force or vibration force is applied to the pile body assembly by the excitation device, so that the stress condition of the pile body in the impact pile sinking process or the vibration pile sinking process in the reality is accurately simulated, so that the change of the pile body under the action of different impact forces or vibration forces is studied. Compared with the traditional ring shear apparatus which can only perform single-face shear test on the pile body, the pile body assembly and the clamping assembly are designed in cooperation, the impact force or vibration force is applied to the pile body assembly by the excitation device, the pile body assembly is caused to rotate horizontally, the change of the soil sample combination surface in the upper and lower shear boxes is realized, and the double-face ring shear test of the pile body is realized. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic view of a dynamic excitation type ring shear apparatus of an embodiment of the present application;

[0026] Figure 2 is a sectional view of the dynamic excitation type ring shear apparatus of the embodiment of the present application;

[0027] Figure 3 is a sectional view of the dynamic excitation type ring shear apparatus of the embodiment of the present application;

[0028] Figure 4 is a schematic view of a vertical support device of an embodiment of the present application;

[0029] Figure 5 is a sectional view of the vertical support device of the embodiment of the present application;

[0030] Figure 6 is a schematic view of a pile body assembly of an embodiment of the present application;

[0031] Figure 7 is a sectional view of the pile body assembly of the embodiment of the present application;

[0032] Figure 8 is a schematic view of an upper shear box and a lower shear box assembled on the pile body assembly of an embodiment of the present application;

[0033] Figure 9 is Figure 8 a sectional view of the assembly structure;

[0034] Figure 10 is a schematic view of a vertical load device of an embodiment of the present application;

[0035] Figure 11 is a schematic view of the assembly of the vertical load device and the pile body assembly of the embodiment of the present application;

[0036] Figure 12 This is a schematic diagram of the support shaft according to an embodiment of the present invention;

[0037] Figure 13 This is a schematic diagram of the assembly of the rotating wheel and the inner annular plate according to an embodiment of the present invention;

[0038] Figure 14 yes Figure 13 A sectional view of the structure;

[0039] Figure 15 This is a schematic diagram of the excitation device according to an embodiment of the present invention;

[0040] Figure 16 This is a cross-sectional view of the excitation device according to an embodiment of the present invention;

[0041] In the diagram: 10. Vertical support device; 11. Inner fixing component; 110. Inner clamping space; 12. Outer fixing component; 120. Outer clamping space; 13. Annular channel; 14. Rolling element; 15. Lower support rod; 16. Lifting upright; 17. Lifting crossbar; 20. Pile assembly; 21. Annular pile; 22. Inner annular plate; 23. Outer annular plate; 24. Fastening connector; 25. Loading plate; 26. Force sensor; 27. Central through hole; 28. Annular groove; 30. Vertical load device; 31. Vertical downward loading assembly; 3 2. Vertical upward loading component; 33. First vertical column; 34. Second vertical column; 35. First horizontal bar; 36. Second horizontal bar; 37. Upper vertical displacement gauge; 38. Lower vertical displacement gauge; 39. Angular displacement sensor; 41. Support shaft; 42. Collar; 43. Connecting rod; 44. Rotating wheel; 50. Vibration excitation device; 51. Circular track; 52. First connecting rod; 53. Vibrator; 54. Laser rangefinder; 55. Pulley; 56. Second connecting rod; 57. Circular groove; 60. Upper shear box; 70. Lower shear box. Detailed Implementation

[0042] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided to make the invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0043] The terms used to express position and direction in this invention are illustrated with reference to the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this invention.

[0044] like Figures 1-16 As shown, a dynamic vibration ring shearing device provided by the present invention includes:

[0045] A pile body assembly 20, comprising a ring-shaped pile body 21, an inner ring-shaped plate 22 connected to the inner side of the ring-shaped pile body 21, and an outer ring-shaped plate 23 connected to the outer side of the ring-shaped pile body 21;

[0046] A vertical support device 10, comprising a clamping assembly having a clamping space, the inner ring-shaped plate 22 and the outer ring-shaped plate 23 are clamped by the clamping space, and the contact between the inner ring-shaped plate 22, the outer ring-shaped plate 23 and the clamping assembly is rolling contact, and the pile body assembly 20 can rotate horizontally in the clamping space;

[0047] A shearing box assembly, comprising an upper shearing box 60 and a lower shearing box 70 for placing samples to be tested, the upper shearing box 60 is placed on the upper surface of the ring-shaped pile body 21, and the lower shearing box 70 is placed on the lower surface of the ring-shaped pile body 21;

[0048] A vertical load device 30, comprising a vertical downward loading assembly 31 for applying vertical pressure to the upper shearing box 60 and a vertical upward loading assembly 32 for applying vertical pressure to the lower shearing box 70;

[0049] A vibration excitation device 50 for applying an impact force perpendicular to the vertical direction to the pile body assembly 20 or applying a vibration force to the pile body assembly 20.

[0050] In this embodiment, before the test, the inner ring plate 22, the outer ring plate 23 and the ring pile body 21 are connected into a whole structure, that is, the pile body assembly 20, and then the pile body assembly 20 is installed on the vertical supporting device 10. The inner ring plate 22 and the outer ring plate 23 are clamped up and down by the clamping assembly, and the ring pile body 21 is exposed outside the clamping assembly, so that the position of the pile body assembly 20 in the vertical direction does not change, the contact between the inner ring plate 22, the outer ring plate 23 and the clamping assembly is rolling contact, which effectively reduces the resistance of the rotation of the pile body assembly 20, minimizes the irrelevant constraint effect on the pile body assembly 20, and further improves the accuracy of the test data. Then, the installation of the shear box assembly is carried out: the soil sample is uniformly pressed into the upper shear box 60 and the lower surface of the soil sample is fixed, the soil sample is uniformly pressed into the lower shear box 70 and the upper surface of the soil sample is fixed, then the upper shear box 60 is placed on the upper surface of the ring pile body 21, the lower shear box 70 is placed on the lower surface of the ring pile body 21, then the vertical downward loading assembly 31 applies vertical pressure to the upper shear box 60, and the vertical upward loading assembly 32 applies vertical pressure to the lower shear box 70, so as to apply double-face normal stress to the ring pile body 21, so as to study the change of the pile body under different normal pressure, which is beneficial to the research.

[0051] In the above embodiment, the vertical upward loading assembly 32 and the vertical downward loading assembly 31 are not given specific forms, but those skilled in the art can know that there are many choices for this implementation, such as applying vertical pressure to the shear box by an electric cylinder, or other pressure applying means in the art, as long as the vertical pressure can be applied to the upper shear box 60 and the lower shear box 70.

[0052] When the actual dynamic pile driving process of the pile body is simulated, a certain pressure is applied to the lower shear box 70 by the vertical upward loading assembly 32, and a certain pressure is applied to the upper shear box 60 by the vertical downward loading assembly 31, so that the upper shear box 60 and the lower shear box 70 do not rotate relative to the pile body assembly 20, and then the impact force perpendicular to the vertical direction is applied to the pile body assembly 20 by the excitation device 50. Figure 1When the impact force is applied to the pile body assembly 20 by the excitation device 50, the pile body assembly 20 rotates horizontally under the action of the impact force, so that the soil sample bonding surface in the upper shear box 60 and the lower shear box 70 changes, and the double-shear test of the pile body under the impact force is realized. When the vibration force is applied to the pile body assembly 20 by the excitation device 50, the pile body assembly 20 rotates horizontally under the action of the vibration force, so that the soil sample bonding surface in the upper shear box 60 and the lower shear box 70 changes, and the double-shear test of the pile body under the vibration force is realized. By applying the impact force or the vibration force to the annular pile body 21 by the excitation device 50, the process of the actual pile body assembly 20 subjected to the impact pile driving or the vibration pile driving is simulated, so as to study the change of the pile body under the action of different impact forces or vibration forces, which is beneficial to the research. The excitation device 50 can change the size of the impact force and the vibration force according to the actual situation, so as to achieve dynamic controllable adjustment. In addition, compared with the traditional ring shear apparatus which can only perform single-shear test on the pile body, the impact force or the vibration force applied to the pile body assembly 20 by the excitation device 50 is used to make the pile body assembly 20 rotate horizontally, so that the annular pile body 21 changes the soil sample bonding surface in the upper shear box 60 and the lower shear box 70 at the same time, and the double-shear effect is achieved.

[0053] It can be understood that, in order to realize the accurate control of the vertical upward loading assembly 32, the vertical downward loading assembly 31 and the excitation device 50, the application further provides a controller electrically connected with the vertical upward loading assembly 32, the vertical downward loading assembly 31 and the excitation device 50, respectively. The controller can realize the accurate control of the vertical pressure, the impact force and the vibration force, so as to realize the stress-controllable shear test, and has high stability and reliability.

[0054] Referring to Figure 6 and 7 The annular pile body 21, the inner annular plate 22 and the outer annular plate 23 of the application are connected into a whole through the fastening connecting piece 24. Specifically, the annular pile body 21, the inner annular plate 22 and the outer annular plate 23 of the embodiment are all provided with radial through holes at corresponding positions, and the fastening connecting piece 24 is sequentially inserted through the radial through holes of the outer annular plate 23, the annular pile body 21 and the inner annular plate 22 to connect the three into a whole. The fastening connecting piece 24 of the embodiment is preferably a bolt, and of course, the fastening connecting piece 24 can also be a screw or a pin shaft in other embodiments. In addition, the thickness of the annular pile body 21 is greater than the thickness of the inner annular plate 22 and the outer annular plate 23.

[0055] Referring to Figure 8 and Figure 9The upper shear box 60 of the present application has an upper annular space with an opening facing downward, and the lower shear box 70 has a lower annular space with an opening facing upward, the upper annular space is filled with soil samples and compacts the soil samples, and the lower annular space is filled with soil samples and compacts the soil samples. The soil samples are limited by the annular spaces to avoid relative rotation of the soil samples, thereby ensuring stability of the test.

[0056] As a preferred embodiment, referring to Figure 15 and Figure 16 , the exciting device 50 comprises a ring track 51, a first connecting rod 52 and an exciter 53, the ring track 51 is located at the periphery of the pile body assembly 20, the outer side of the ring track 51 is connected with the vertical support device 10 through the first connecting rod 52, the exciter 53 is in sliding connection with the ring track 51, and the outer side wall of the outer annular plate 23 is provided with a load plate 25, and the exciter 53 is used for applying an impact force or a vibration force to the load plate 25.

[0057] In the embodiment, the load plate 25 is perpendicular to the outer side wall of the outer annular plate 23 and extends in the direction of the ring track 51, and a stress surface of the load plate 25 is opposite to the exciter 53; the exciter 53 is in sliding connection with the ring track 51, when an impact force needs to be applied to the pile body assembly 20, the exciter 53 is slid to a preset position, so that the exciter 53 is away from the load plate 25 by a preset distance, to simulate the jumping height of an impact hammer, then the exciter 53 applies an impact force to the load plate 25, under the action of the impact force, the pile body assembly 20 moves in horizontal rotation, to achieve a double-shear effect; when a vibration force needs to be applied to the pile body, the exciter 53 is first slid to be close to the load plate 25, so that the exciter 53 applies a pressure to the load plate 25, then the exciter 53 applies a vibration force to the load plate 25, under the joint action of the vibration force and the pressure of the exciter 53, the pile body assembly 20 moves in horizontal rotation, to achieve a double-shear effect. The exciter 53 is slidably installed on the ring track 51, so that the position between the exciter 53 and the load plate 25 can be flexibly adjusted, different test purposes can be achieved, and the flexibility is high.

[0058] In the above embodiment, the specific structure of the exciter 53 is not given, but those skilled in the art can know that the exciter 53 can be an existing exciter 53 on the market, as long as it can apply an impact force or a vibration force.

[0059] Preferably, two exciters 53 are symmetrically arranged on the ring track 51, correspondingly, two load plates 25 are arranged on the outer annular plate 23, each exciter 53 corresponds to a load plate 25, and the two exciters 53 simultaneously apply impact forces or vibration forces of the same size to the corresponding load plates 25, so that the impact force or the vibration force received by the pile body assembly 20 is symmetrical, thereby ensuring that the pile body assembly 20 does not move eccentrically.

[0060] As a preferred embodiment, the load plate 25 is provided with a force sensor 26, and the surface of the exciter 53 opposite to the load plate 25 is provided with a laser range finder 54.

[0061] In this embodiment, the impact force or vibration force generated by the exciter 53 is conducted to the pile body assembly 20 through the load plate 25, and the impact force or vibration force can be detected in real time through the force sensor 26 on the load plate 25, so that the test data can be flexibly adjusted and the convenience of the test is improved. The laser range finder 54 is used to measure the vertical distance between the exciter 53 and the load plate 25, so that the jumping height of the impact hammer can be correctly simulated.

[0062] As a preferred embodiment, referring to Figure 10 The angle displacement sensor 39 is also used to detect the rotation angle of the pile body assembly 20. The rotation angle of the pile body assembly 20 can be detected in real time through the angle displacement sensor 39, so that the convenience of the test is improved. Specifically, the angle displacement sensor 39 of the present application is fixed on the second vertical column 34 through a support, and the angle displacement sensor 39 is located on the outer circumferential path of the outer ring plate 23, so that the rotation angle of the pile body assembly 20 can be accurately detected.

[0063] As a preferred embodiment, referring to Figure 16 The excitation device 50 further comprises a pulley 55 and a second connecting rod 56, the inner side of the annular track 51 is provided with an annular sliding groove 57, one end of the second connecting rod 56 is connected with the exciter 53, the other end of the second connecting rod 56 is connected with the pulley 55, and the pulley 55 is slidably connected in the annular sliding groove 57. Through the arrangement of the pulley 55 and the annular sliding groove 57, the smoothness of the movement of the exciter 53 on the annular track 51 is improved, and the position of the exciter 53 on the annular track 51 can be flexibly adjusted.

[0064] As a preferred embodiment, referring to Figure 10 and Figure 11The vertical load device 30 further comprises two first vertical columns 33, two second vertical columns 34, an upper vertical displacement meter 37 and a lower vertical displacement meter 38. The upper ends of the two first vertical columns 33 are movably connected with a first horizontal rod 35, the lower ends of the two second vertical columns 34 are movably connected with a second horizontal rod 36, the upper end of the vertical downward loading assembly 31 is connected with the middle part of the first horizontal rod 35, the lower end of the vertical downward loading assembly 31 is in contact with the top of the upper shear box 60, the lower end of the vertical upward loading assembly 32 is connected with the middle part of the second horizontal rod 36, and the upper end of the vertical upward loading assembly 32 is in contact with the bottom of the lower shear box 70. The upper vertical displacement meter 37 is vertically arranged and its top end is connected with the first vertical column 33 through a first connecting plate, and the lower vertical displacement meter 38 is vertically arranged and its bottom end is connected with the second vertical column 34 through a second connecting plate.

[0065] In the embodiment, the vertical downward loading assembly 31 is connected with the first vertical column 33 through the first horizontal rod 35, and the first vertical column 33 guides the downward movement of the vertical downward loading assembly 31. Similarly, the vertical upward loading assembly 32 is connected with the second vertical column 34 through the second horizontal rod 36, and the second vertical column 34 guides the upward movement of the vertical upward loading assembly 32. The upper vertical displacement meter 37 is used to measure the vertical displacement of the upper shear box 60 after the vertical downward loading assembly 31 exerts vertical pressure on the upper shear box 60, and the lower vertical displacement meter 38 is used to measure the vertical displacement of the lower shear box 70 after the vertical upward loading assembly 32 exerts vertical pressure on the lower shear box 70. Preferably, the upper vertical displacement meter 37 of the embodiment is provided with two upper vertical displacement meters 37 which are distributed at different positions of the upper shear box 60 to improve the measurement accuracy. Similarly, the lower vertical displacement meter 38 is also provided with two lower vertical displacement meters 38.

[0066] As a preferred embodiment, refer to Figure 4 and Figure 5 The clamping assembly comprises two inner fixing members 11 arranged oppositely in up and down directions and two outer fixing members 12 arranged oppositely in up and down directions. The inner fixing members 11 are located inside the outer fixing members 12. An annular channel 13 is enclosed between the outer side surface of the inner fixing members 11 and the inner side surface of the outer fixing members 12. The upper and lower surfaces of the inner annular plate 22 are clamped by the two inner fixing members 11, the upper and lower surfaces of the outer annular plate 23 are clamped by the two outer fixing members 12, and the annular pile body 21 is located in the annular channel 13.

[0067] In the embodiment, the inner clamping space 110 is formed between the upper and lower end faces of the two inner fixing members 11, the outer clamping space 120 is formed between the upper and lower end faces of the two outer fixing members 12, the inner annular plate 22 is clamped by the inner clamping space 110, the outer annular plate 23 is clamped by the outer clamping space 120, and the annular pile body 21 is located in the annular channel 13. In this way, the vertical displacement of the annular pile body 21 in the vertical direction is limited by the inner fixing members 11 and the outer fixing members 12.

[0068] As a preferred embodiment, the two inner fixing members 11 each have an inner annular fixing groove, and the two outer fixing members 12 each have an outer annular fixing groove. The inner annular fixing groove and the outer annular fixing groove each have a rolling body 14 for rolling contact with the surface of the inner annular plate 22 and the outer annular plate 23.

[0069] In the embodiment, the rolling body 14 for rolling contact with the surface of the inner annular plate 22 and the outer annular plate 23 is arranged between the two inner fixing members 11 and the two outer fixing members 12, which effectively reduces the resistance to horizontal rotation of the pile body assembly 20. In the embodiment, the rolling body 14 is preferably a rolling ball. Of course, in other embodiments, the rolling body 14 can also be other rolling structures, as long as rolling contact is ensured between the inner fixing members 11, the outer fixing members 12, the inner annular plate 22, and the outer annular plate 23.

[0070] As a preferred embodiment, referring to Figure 4 and Figure 5 , the vertical support device 10 further comprises a plurality of lower support rods 15 and a plurality of lifting vertical rods 16. The top of each lower support rod 15 is connected to the bottom of the clamping assembly, and the lower end of each lifting vertical rod 16 is connected to the top of the clamping assembly.

[0071] In the embodiment, the clamping assembly is supported and fixed by the lower support rods 15. When the pile body assembly 20 is to be clamped, the top of the clamping assembly is lifted by the lifting vertical rods 16 to place the pile body assembly 20 in the clamping space, and then the lifting vertical rods 16 are lowered to achieve clamping and fixing. Specifically, the top and the bottom of the inner fixing members 11 and the outer fixing members 12 are connected to the bottom surface of the lower support rods 15, and the lower part and the upper part of the inner fixing members 11 and the outer fixing members 12 are connected to the top surface of the lifting vertical rods 16. In this way, the upper part of the inner fixing members 11 and the outer fixing members 12 is lifted by the lifting vertical rods 16. More specifically, the upper ends of the plurality of lifting vertical rods 16 are jointly connected to a lifting cross rod 17, and the two ends of the lifting cross rod 17 are respectively connected to two second vertical columns 34. Therefore, the plurality of lifting vertical rods 16 can be simultaneously lifted or simultaneously pressed by the lifting cross rod 17, which is simple and convenient to operate.

[0072] As a preferred embodiment, referring to Figure 12 ,Figure 13 and Figure 14 Further comprising a vertically arranged support shaft 41, a collar 42 is arranged on the top of the support shaft 41, a plurality of connecting rods 43 are arranged on the outer periphery of the collar 42 along the circumferential direction of the collar 42, each of the connecting rods 43 is rotatably arranged with a rotating wheel 44 at the end away from the collar 42, the inner annular plate 22 is provided with a central through hole 27, an annular groove 28 is arranged on the hole wall of the central through hole 27, the support shaft 41 extends to the center position of the central through hole 27, and the rotating wheel 44 is in rolling connection with the annular groove 28.

[0073] In the embodiment, when the pile body assembly 20 is subjected to impact force or vibration force and horizontal rotation occurs, the pile body assembly 20 horizontally rotates along the vertical axis of the support shaft 41, so that the rotation axis of the pile body assembly 20 does not change; the inner annular plate 22 of the pile body assembly 20 is in rolling contact with the rotating wheel 44, so that the friction between the pile body assembly 20 and the rotating wheel 44 is reduced.

[0074] Although the embodiments of the present application have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present application, and those of ordinary skill in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments without departing from the principles and purposes of the present application within the scope of the present application, and all these changes should belong to the protection scope of the claims of the present application.

Claims

1. A dynamic vibration-type ring shearing device, characterized in that, include: The pile assembly (20) includes an inner annular plate (22) and an outer annular plate (23) of an annular pile body (21), wherein the inner annular plate (22) is connected to the inner side of the annular pile body (21) and the outer annular plate (23) is connected to the outer side of the annular pile body (21); The vertical support device (10) includes a clamping assembly with a clamping space. The inner annular plate (22) and the outer annular plate (23) are clamped vertically by the clamping space. The contact between the inner annular plate (22), the outer annular plate (23) and the clamping assembly is a rolling contact. The pile assembly (20) can rotate horizontally within the clamping space. The shear box assembly includes an upper shear box (60) and a lower shear box (70) for placing the sample to be tested. The upper shear box (60) is placed on the upper surface of the annular pile (21), and the lower shear box (70) is placed on the lower surface of the annular pile (21). The vertical load device (30) includes a vertical downward loading component (31) for applying vertical pressure to the upper shear box (60) and a vertical upward loading component (32) for applying vertical pressure to the lower shear box (70); Vibration device (50) is used to apply an impact force perpendicular to the vertical direction to the pile assembly (20) or to apply a vibration force to the pile assembly (20); The clamping assembly includes two inner fixing members (11) arranged vertically opposite each other and two outer fixing members (12) arranged vertically opposite each other. The inner fixing members (11) are located inside the outer fixing members (12). The outer side of the inner fixing members (11) and the inner side of the outer fixing members (12) form an annular channel (13). The upper and lower surfaces of the inner annular plate (22) are clamped by the two inner fixing members (11). The upper and lower surfaces of the outer annular plate (23) are clamped by the two outer fixing members (12). The annular pile (21) is located inside the annular channel (13). Both inner fixing members (11) have inner annular fixing grooves, and both outer fixing members (12) have outer annular fixing grooves. The inner and outer annular fixing grooves are provided with rolling elements (14) for rolling contact with the surfaces of the inner annular plate (22) and the outer annular plate (23).

2. The dynamic vibration ring shearing device according to claim 1, characterized in that, The vibration device (50) includes an annular track (51), a first connecting rod (52), and a vibrator (53). The annular track (51) is located on the periphery of the pile assembly (20). The outer side of the annular track (51) is connected to the vertical support device (10) through the first connecting rod (52). The vibrator (53) is slidably connected to the annular track (51). The outer wall of the outer annular plate (23) is provided with a load plate (25). The vibrator (53) is used to apply impact force or vibration force to the load plate (25).

3. The dynamic vibration ring shearing device according to claim 2, characterized in that, A force sensor (26) is provided on the load plate (25), and a laser rangefinder (54) is provided on the surface of the vibrator (53) opposite to the load plate (25).

4. The dynamic vibration ring shearing device according to claim 1, characterized in that, It also includes an angular displacement sensor (39) for detecting the rotation angle of the pile assembly (20).

5. The dynamic vibration ring shearing device according to claim 2, characterized in that, The excitation device (50) further includes a pulley (55) and a second connecting rod (56). The inner side of the annular track (51) is provided with an annular groove (57). One end of the second connecting rod (56) is connected to the exciter (53), and the other end of the second connecting rod (56) is connected to the pulley (55). The pulley (55) slides in the annular groove (57).

6. The dynamic vibration ring shearing device according to claim 1, characterized in that, The vertical load device (30) further includes two first vertical columns (33), two second vertical columns (34), an upper vertical displacement meter (37), and a lower vertical displacement meter (38). The upper ends of the two first vertical columns (33) are movably connected to a first horizontal bar (35), and the lower ends of the two second vertical columns (34) are movably connected to a second horizontal bar (36). The upper end of the vertical downward loading component (31) is connected to the middle of the first horizontal bar (35). The lower end contacts the top of the upper shear box (60), the lower end of the vertical upward loading component (32) is connected to the middle of the second crossbar (36), the upper end of the vertical upward loading component (32) contacts the bottom of the lower shear box (70), the upper vertical displacement meter (37) is vertically set and its top end is connected to the first vertical column (33) through the first connecting plate, and the lower vertical displacement meter (38) is vertically set and its bottom end is connected to the second vertical column (34) through the second connecting plate.

7. The dynamic vibration ring shearing device according to claim 1, characterized in that, The vertical support device (10) also includes multiple lower support rods (15) and multiple lifting rods (16). The top of each lower support rod (15) is connected to the bottom of the clamping assembly, and the lower end of each lifting rod (16) is connected to the top of the clamping assembly.

8. The dynamic vibration ring shearing device according to claim 1, characterized in that, It also includes a vertically arranged support shaft (41), the top of which is provided with a collar (42), and a plurality of connecting rods (43) are provided on the outer periphery of the collar (42) along its circumferential direction. Each connecting rod (43) has a rotating wheel (44) rotatably arranged at the end away from the collar (42). The inner annular plate (22) is provided with a central through hole (27), and the hole wall of the central through hole (27) is provided with an annular groove (28). The support shaft (41) extends to the center of the central through hole (27), and the rotating wheel (44) is in rolling connection with the annular groove (28).

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