Multi-angle core structural plane rapid shearing device

Abstract

The utility model discloses a kind of multi-angle core structural plane fast shearing device, belong to core structural plane testing technical field, solve the existing core shearing device due to the need first to cast concrete into specific form sample and then carry out shearing test and lead to exist the problem of low work efficiency, sample preparation time-consuming and labor-consuming and be greatly influenced by sample preparation person level difference.This utility model is by being provided with the transverse shearing module and longitudinal shearing module of adjustable position angle on base, the angle of core sample in transverse shearing module and longitudinal shearing module core box can be adjusted, without casting concrete sample preparation, improve the core structural plane shearing test efficiency, and by being provided with two fixed blocks articulated using two parallel links, two fixed blocks respectively with the stress surface of two compression strips keep parallel, so that the compression of two compression strips in first core box and second core box core sample tightness can be mutually offset, improve the test precision of shearing test.

Description

Technical Field

[0001] This utility model relates to the field of core structure surface testing technology, specifically to a multi-angle core structure surface rapid shearing device. Background Technology

[0002] Rock (mass) structural surfaces refer to two-dimensional planar geological interfaces with a certain direction, large extension, and small thickness, formed and continuously developed by rocks (masses) under tectonic stress. These interfaces include faults, joints, bedding, and fracture zones. Rock (mass) shear strength refers to the maximum shear stress that a rock (mass) can withstand before failure under shear load. Shear strength parameters are one of the important parameters affecting the stability analysis and design of geotechnical engineering projects such as slope excavation, tunnel construction, and underground chambers. It is mainly obtained through direct shear tests and conventional laboratory tests such as triaxial tests on rock samples cut to specific sizes (cubic or cylindrical). Rock shear strength tests typically include three types: shear fracture strength, shear strength, and shear resistance. A rock mass structural surface is essentially a test in which two rock specimens are subjected to a horizontal load under normal load, causing horizontal displacement along the mating surface. The shear displacement surface is an existing surface without cohesion; its shear strength is only related to the frictional force, which is related to the normal load and the internal friction angle (coefficient).

[0003] Because the structural plane and the horizontal plane have a certain angle (structural plane inclination angle), traditional conventional rock mechanics testing methods require preparing appropriate specimens based on the inclination angle before sample preparation to ensure that the applied vertical load is perpendicular to the structural plane and the shear stress is parallel to the structural plane. Therefore, this method suffers from problems such as time-consuming and labor-intensive sample preparation and testing, susceptibility to the influence of operator skill levels in sample preparation, and the inability to perform rapid shear tests on a large number of rock specimens. Especially in geotechnical engineering projects that require frequent assessments of rock mechanical properties, conventional shear tests have certain limitations.

[0004] Existing core shearing devices require the excavation of fresh rock with structural surfaces on-site, followed by cutting to create specimens that meet experimental size requirements. The rock is then poured into a specific shearing box (cubic or cylindrical) to form a standard specimen. After the concrete has cured, shear tests are conducted along the structural surface. However, the long curing time required for concrete results in a lengthy testing cycle for the shear specimens. Utility Model Content

[0005] To address the aforementioned problems in the prior art, this utility model provides a rapid shearing device for multi-angle core structural surfaces, which solves the problems of low work efficiency, time-consuming and labor-intensive sample preparation, and significant dependence on the skill level of the sample preparer in existing core shearing devices, which require pouring concrete to form a sample of a specific shape before conducting the shearing test.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A rapid shearing device for multi-angle core structure surfaces is provided, including a base and a data acquisition module. The upper surface of the base is provided with a transverse shearing module and a longitudinal shearing module. The transverse shearing module includes two first guide rails spaced laterally on the upper surface of the base, with a transverse sliding plate slidably disposed between the two first guide rails. A first drive source is provided on one side of the transverse sliding plate, driving the transverse sliding plate to slide along the length direction of the two first guide rails. A first core box with an adjustable position and angle is rotatably disposed on the transverse sliding plate. The longitudinal shearing module includes two second guide rails spaced longitudinally on the upper surface of the base, with a longitudinal shearing module slidably disposed between the two second guide rails. A second drive source is provided on one side of the longitudinal slide plate, which drives the longitudinal slide plate to slide along the length of the two second guide rails. A second core box with an adjustable position angle is rotatably mounted on the longitudinal slide plate. Both the first and second core boxes have pressure strips extending outward for pressing the core samples. Fixed rods are provided on both the transverse and longitudinal slide plates, and a fixed block is rotatably mounted on each fixed rod. The adjacent end faces of the two fixed blocks abut against the two pressure strips through pads. Two parallel connecting rods are detachably and hinged between the two fixed blocks. The data acquisition module is used to collect the pressure and displacement of the first and second drive sources in real time.

[0007] Furthermore, each fixing block includes a rotating sleeve for fitting onto the fixing rod, and each rotating sleeve has a hinge plate at the bottom and a pressing plate at the top for contacting the pressure bar; the two ends of the two parallel connecting rods are detachably hinged to the two hinge plates respectively.

[0008] Furthermore, each clamping plate is a cuboid structure with first threaded through holes on both sides of its end face to mate with fixing bolts. Two fixing bolts pass through the two first threaded through holes and are threadedly connected to the pad block.

[0009] Furthermore, the first and second core boxes have the same structure, both including a box body for holding the core sample. The bottom of the box body is rotatably connected to the upper end face of the base. The inside of the box body is provided with a sliding groove and a mounting groove. Both the sliding groove and the mounting groove are set towards one side wall of the box body. The cross-section of the sliding groove is T-shaped. The sliding groove is set along the length of the box body and passes through both ends of the box body. The pressure strip is slidably set in the sliding groove and the length of the pressure strip is greater than the length of the box body. The outer side of the pressure strip contacts the corresponding fixing block, and the inner side of the pressure strip contacts the outer wall of the core sample. The opening of the sliding groove is connected to the bottom of the mounting groove, and the opening of the mounting groove is connected to one side wall of the box body. A clamping block is set at the opening of the mounting groove. The four outer walls of the core sample are in close contact with the bottom of the mounting groove, the inner side of the pressure strip, and the inner side of the clamping block, respectively.

[0010] Furthermore, the lower end face of the box is provided with a rotating shaft and a T-shaped locking rod at intervals. The rotating shaft is rotatably connected to the upper end face of the base. The upper end face of the base is provided with an arc-shaped groove. The center of the arc-shaped groove coincides with the axis of the rotating shaft. The cross-section of the arc-shaped groove is T-shaped. The T-shaped locking rod is slidably engaged with the arc-shaped groove.

[0011] Furthermore, the T-shaped locking rod includes a rod body, which is threadedly connected to the second threaded through hole of the box body. The top of the rod body is provided with a hexagonal countersunk hole, and the bottom of the rod body is provided with a flange located in an arc groove.

[0012] Furthermore, a rubber pad is provided on the top surface of the flange.

[0013] Furthermore, the bottom of the mounting groove, the inner side of the pressure strip, and the inner side of the clamping block are straight or curved surfaces.

[0014] Furthermore, an oil pump is installed inside the base. Both the first and second drive sources are oil cylinders. The oil pump is connected to the first and second drive sources respectively through hydraulic pipes and flow dividers.

[0015] Furthermore, the data acquisition module includes two pressure sensors, two displacement sensors, and a display, all of which are electrically connected to the host computer. The two pressure sensors are respectively installed on the pipes of the first drive source and the second drive source to collect the pressure of the first drive source and the second drive source in real time. The two displacement sensors are respectively installed on the transverse slide plate and the longitudinal slide plate to collect the displacement of the first drive source and the second drive source in real time. The display is used to display the pressure and displacement of the first drive source and the second drive source in real time.

[0016] The beneficial effects of this utility model are as follows: 1. This utility model features an adjustable transverse shearing module and a longitudinal shearing module on the base. These modules allow for adjustment of the angle of the core sample within the core box, precisely matching the inclination angle of the core sample's structural surface. This enables direct shear testing of structural surfaces using core samples drilled at the engineering survey site, eliminating the need for concrete casting. This improves the efficiency of core structural surface shear testing and reduces core sample preparation time. Furthermore, by incorporating two fixing blocks hinged by two parallel connecting rods, the two fixing blocks remain parallel to the force-bearing surfaces of the two pressure strips. This ensures that the clamping forces exerted by the two pressure strips on the core samples in the first and second core boxes cancel each other out, facilitating installation while improving the accuracy of the shear test.

[0017] 2. This utility model hinges the parallel connecting rod to the hinge plate located at the bottom of the fixed block, so that the parallel connecting rod is located at the bottom of the core sample, thus avoiding affecting the installation process of the two core samples in the first core box and the second core box respectively.

[0018] 3. The clamping plate of this invention is connected to the pad block through the first threaded through hole and the fixing bolt, allowing the clamping plate to be flexibly adjusted and fixed to adapt to core samples of different sizes. This design enhances the adaptability and adjustability of the device, ensures close contact between the pressure bar and the core sample, prevents the sample from slipping during shearing, and improves the accuracy of the test.

[0019] 4. Both the first and second core boxes of this invention accommodate core samples via sliding grooves and mounting slots. A pressure strip is slidably positioned within the sliding groove, engaging with the clamping block to firmly secure the core sample. This structure allows for rapid installation and replacement of core samples without the need for additional sample preparation; the drilled core can be used directly for testing, significantly reducing preparation time. Furthermore, the length of the pressure strip is greater than the box body, ensuring sufficient contact between the pressure strip and the sample, providing uniform clamping force.

[0020] 5. This utility model, through the cooperation of the rotating shaft and the T-shaped locking rod with the arc-shaped groove, allows the core box to rotate on the base and lock at different angles, thereby adapting to core structural surfaces with different inclination angles. The T-shaped cross-section of the arc-shaped groove and the sliding cooperation of the T-shaped locking rod provide a stable angle adjustment and locking mechanism, enabling the device to quickly set the shear angle and improving the flexibility and efficiency of testing.

[0021] 6. This utility model ensures the reliability and convenience of locking by threading the T-shaped locking rod to the box body and tightening or loosening it through the hexagonal countersunk hole to make the flange and the arc groove press against each other or loosen.

[0022] 7. The rubber pad provided in this utility model increases the friction between the flange and the arc groove, improving the locking stability of the T-shaped locking rod. At the same time, the rubber pad also has a buffering effect, extending the service life of the device.

[0023] 8. This invention, by designing the contact surface as a straight surface or a curved surface, can adapt to core samples of different shapes, such as cylindrical or cubic samples. The curved surface is particularly suitable for cylindrical cores, providing better fit, ensuring uniform stress on the sample during shearing, avoiding stress concentration, and improving the reliability of test results.

[0024] 9. This utility model uses a hydraulic cylinder as the driving source and provides power through an oil pump, hydraulic pipe and flow divider valve to achieve stable and controllable shear force output.

[0025] 10. The data acquisition module of this utility model monitors the pressure and displacement of the drive source in real time through pressure and displacement sensors. The data is uploaded to the host computer and displayed on the monitor, realizing the automation and digitization of the testing process. This allows operators to monitor the test status in real time, adjust parameters in a timely manner, and ensure the accuracy and repeatability of the test data. Attached Figure Description

[0026] Figure 1 A schematic diagram of a rapid shearing device for multi-angle core structure surfaces; Figure 2 This is a top view of a rapid shearing device for multi-angle core structure surfaces; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the fixed block structure; Figure 5 This is a structural schematic diagram of the first or second core box; The components are as follows: 1. Base; 2. Pressure sensor; 3. Displacement sensor; 4. Display; 5. Transverse shearing module; 6. Longitudinal shearing module; 7. First guide rail; 8. Transverse sliding plate; 9. First drive source; 10. First core box; 11. Second guide rail; 12. Longitudinal sliding plate; 13. Second core box; 14. First core sample; 15. Box body; 16. Slide groove; 17. Mounting groove; 18. Pressure strip; 19. Clamping block; 20. Rotating shaft; 21. T-shaped locking rod; 211. Flange; 22. Arc groove; 23. Second core sample; 24. Fixing rod; 25. Fixing block; 251. Pressing plate; 252. Hinge plate; 253. Parallel connecting rod; 26. Oil pump; 27. Hydraulic pipe; 28. Diverter valve; 29. ​​Second drive source. Detailed Implementation

[0027] The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All utility model creations utilizing the concept of this utility model are within the scope of protection.

[0028] refer to Figure 1 This embodiment provides a rapid shearing device for multi-angle core structure surfaces, which includes a base 1 and a data acquisition module. The upper surface of the base 1 is provided with a transverse shearing module 5 and a longitudinal shearing module 6.

[0029] The transverse shearing module 5 includes two first guide rails 7 that are transversely spaced on the upper surface of the base 1. A transverse slide plate 8 is slidably arranged between the two first guide rails 7. A first drive source 9 is arranged on one side of the transverse slide plate 8. The first drive source 9 drives the transverse slide plate 8 to slide along the length direction of the two first guide rails 7. A first core box 10 with adjustable position and angle is rotatably arranged on the transverse slide plate 8.

[0030] The longitudinal shearing module 6 includes two second guide rails 11 that are longitudinally spaced apart on the upper surface of the base 1. A longitudinal slide plate 12 is slidably arranged between the two second guide rails 11. A second drive source 29 is arranged on one side of the longitudinal slide plate 12. The second drive source 29 drives the longitudinal slide plate 12 to slide along the length direction of the two second guide rails 11. A second core box 13 with adjustable position and angle is rotatably arranged on the longitudinal slide plate 12.

[0031] By setting up a transverse shearing module 5 and a longitudinal shearing module 6 with adjustable position and angle on the base 1, the angle of the core sample inside the core box of the transverse shearing module 5 and the longitudinal shearing module 6 can be adjusted, which can accurately match the inclination angle of the core sample's structural surface. The core sample obtained from the drilling site in the engineering survey can be used directly to carry out structural surface shear tests without the need to pour concrete for sample preparation, which improves the efficiency of core structural surface shear tests and reduces the core sample preparation time.

[0032] refer to Figure 2 and Figure 3 Both the first core box 10 and the second core box 13 have outwardly extending pressure strips 18 for pressing the core sample. Both the transverse sliding plate 8 and the longitudinal sliding plate 12 are equipped with fixing rods 24. Each fixing rod 24 is rotatably equipped with a fixing block 25. The adjacent end faces of the two fixing blocks 25 are in contact with the two pressure strips 18 through pads. Two parallel connecting rods 253 are detachably and hinged between the two fixing blocks 25.

[0033] By setting two fixing blocks 25 hinged by two parallel connecting rods 253, the two fixing blocks 25 are kept parallel to the force-bearing surfaces of the two pressure strips 18, which facilitates installation. This allows the clamping forces of the two pressure strips 18 on the core samples in the first core box 10 and the second core box 13 to cancel each other out, improving the test accuracy of the shear test. The parallel connecting rods 253 can be removed at the start of the experiment. The pads in this embodiment can be made of elastic material to accommodate the installation error of the entire device.

[0034] The data acquisition module is used to acquire the pressure and displacement of the first drive source 9 and the second drive source 29 in real time. It includes two pressure sensors 2, two displacement sensors 3, and a display 4, all electrically connected to a host computer. The two pressure sensors 2 are respectively installed on the pipes of the first drive source 9 and the second drive source 29 to acquire the pressure of the two drive sources in real time. The two displacement sensors 3 are respectively installed on the transverse slide plate 8 and the longitudinal slide plate 12 to acquire the displacement of the first drive source 9 and the second drive source 29 in real time. The display 4 is used to display the pressure and displacement of the first drive source 9 and the second drive source 29 in real time.

[0035] In this embodiment, the host computer is a computer or PLC. Pressure sensor 2 and displacement sensor 3 monitor the pressure and displacement of the drive source in real time. The data is uploaded to the host computer and displayed on the display 4, thus automating and digitizing the testing process. This allows operators to monitor the test status in real time, adjust parameters promptly, and ensure the accuracy and repeatability of the test data.

[0036] Specifically, the structure of the fixing block 25 can be referred to Figure 4 Each fixing block 25 includes a rotating sleeve for fitting onto the fixing rod 24. Each rotating sleeve has a hinge plate 252 at its bottom and a clamping plate 251 for contacting the pressure strip 18 at its top and bottom, respectively. Each clamping plate 251 is a cuboid structure with first threaded through holes on both ends for engaging with fixing bolts. Two fixing bolts pass through the two first threaded through holes and are threadedly connected to the pad block. The two ends of the two parallel connecting rods 253 are detachably hinged to the two hinge plates 252. Specifically, when installing the core sample, the hinge shafts at both ends of each parallel connecting rod 253 are inserted into the mounting holes on the two hinge plates 252. During the experiment, the parallel connecting rods 253 are removed from the hinge plates 252. In this embodiment, the parallel connecting rods 253 can be adjustable telescopic rods. The adjustment process maintains the same length for both parallel connecting rods 253, thus adapting to the angle requirements of different core samples.

[0037] In this embodiment, the clamping plate 251 is connected to the pad block through the first threaded through hole and the fixing bolt, allowing the clamping plate 251 to be flexibly adjusted and fixed to accommodate core samples of different sizes. This design enhances the adaptability and adjustability of the device, ensures that the pressure strip 18 is in close contact with the core sample, prevents the sample from slipping during shearing, and improves the accuracy of the test. By hinged the parallel connecting rod 253 to the hinge plate 252 located at the bottom of the fixing block 25, the parallel connecting rod 253 is positioned at the bottom of the core sample, avoiding interference with the installation process of the two core samples in the first core box 10 and the second core box 13, respectively.

[0038] Specifically, refer to Figure 5The first core box 10 and the second core box 13 have the same structure, both including a box body 15 for holding the core sample. The bottom of the box body 15 is rotatably connected to the upper end face of the base 1. The interior of the box body 15 is provided with a sliding groove 16 and a mounting groove 17, both of which are oriented towards one side wall of the box body 15. The cross-section of the sliding groove 16 is T-shaped, and the sliding groove 16 is arranged along the length of the box body 15 and extends through both ends of the box body 15. The pressure strip 18 is slidably mounted on the sliding groove 16. The length of the pressure strip 18 in the groove 16 is greater than the length of the box body 15; the outer side of the pressure strip 18 contacts the corresponding fixing block 25, and the inner side of the pressure strip 18 contacts the outer wall of the core sample; the opening of the groove 16 connects to the bottom of the mounting groove 17, the opening of the mounting groove 17 connects to one side wall of the box body 15, and a clamping block 19 is provided at the opening of the mounting groove 17. The outer walls of the core sample are in close contact with the bottom of the mounting groove 17, the inner side of the pressure strip 18, and the inner side of the clamping block 19, respectively. In the above technical solution, the function of the groove 16 is to slide the pressure strip 18, and one end of the pressure strip 18 can slide to the vicinity of the structural surface of the core sample, thus providing a blocking effect on the structural surface of the core sample; the function of the mounting groove 17 and the clamping block 19 is to fix the entire core sample inside the box body 15, thereby achieving a fixed installation.

[0039] Specifically, the bottom of the mounting groove 17, the inner side of the pressure strip 18, and the inner side of the clamping block 19 are straight or curved surfaces, which can be flexibly selected according to the shape of the core sample. When the core sample is cylindrical, the bottom of the mounting groove 17, the inner side of the pressure strip 18, and the inner side of the clamping block 19 are curved surfaces; while when it is square columnar, the bottom of the mounting groove 17, the inner side of the pressure strip 18, and the inner side of the clamping block 19 are straight surfaces.

[0040] For details regarding the adjustable angle structure of the first core box 10 or the second core box 13, please refer to [reference needed]. Figure 2 and Figure 5 The lower end face of the box 15 is provided with a rotating shaft 20 and a T-shaped locking rod 21 at intervals. The rotating shaft 20 is rotatably connected to the upper end face of the base 1. The upper end face of the base 1 is provided with an arc-shaped groove 22. The center of the arc-shaped groove 22 coincides with the axis of the rotating shaft 20. The cross-section of the arc-shaped groove 22 is T-shaped. The T-shaped locking rod 21 is slidably engaged with the arc-shaped groove 22.

[0041] In the above technical solution, the position angle of the first core box 10 or the second core box 13 and the core sample inside them can be adjusted within the range of 20~90° by setting the length of the arc groove 22. The T-shaped locking rod 21 includes a rod body that is threadedly connected to the second threaded through hole of the box body 15. A hexagonal countersunk hole is provided at the top of the rod body, and a flange 211 located within the arc groove 22 is provided at the bottom of the rod body. Furthermore, a rubber pad is provided on the top surface of the flange 211.

[0042] In this embodiment, the core samples of the first core box 10 and the second core box 13 are the first core sample 14 and the second core sample 23, respectively.

[0043] Specifically, an oil pump 26 is installed inside the base 1. The first drive source 9 and the second drive source 29 are both oil cylinders. The oil pump 26 is connected to the first drive source 9 and the second drive source 29 through a hydraulic pipe 27 and a diverter valve 28, respectively.

[0044] Preferably, a protective cover is provided on the top of the base 1. When performing shear tests on the core sample, the protective cover can prevent the core sample from splashing, thus protecting the test personnel.

[0045] In summary, the experimental method for this scheme is as follows: Test methods for rapid shearing devices for multi-angle core structural planes include: Step 1: Place the second core sample 23 inside the second core box 13, adjust the position angle of the second core box 13 relative to the longitudinal sliding plate 12 so that the structural surface of the second core sample 23 is parallel to the vertical plane, lock the current position of the second core box 13, slide one end of the pressure strip 18 to the vicinity of the structural surface of the second core sample 23, and use the parallel connecting rod 253 to make the two fixing blocks 25 parallel. Step 2: Place the first core sample 14 inside the first core box 10, adjust the position and angle of the first core box 10 relative to the transverse sliding plate 8, align the structural surface of the first core sample 14 with the structural surface of the second core sample 23, lock the current position of the first core box 10, and slide one end of the pressure strip 18 to the vicinity of the structural surface of the first core sample 14; use the pads to make the two fixing blocks 25 contact the two pressure strips 18 respectively; Step 3: Disassemble and remove the two parallel connecting rods 253, start the first drive source 9 and the second drive source 29, and carry out shear tests on the first core sample 14 and the second core sample 23 according to the preset pressure and shear rate. Step 4: During the shear test, pressure sensor 2 and displacement sensor 3 are used to collect the pressure and displacement of the first driving source 9 and the second driving source 29 in real time, and upload the data to the background system for storage. Step 5: Denote the pressure of the second driving source 29 as normal stress F1 and the pressure of the first driving source 9 as shear stress F2; ​​denote the longitudinal displacement of the second driving source 29 as normal displacement S1 and the transverse displacement of the first driving source 9 as shear displacement S2; plot the shear stress-shear displacement relationship curves under different normal stresses based on normal stress F1, shear stress F2 and shear displacement S2, and complete the shear test of the core structure surface.

[0046] Although specific embodiments of the utility model have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this solution. Various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this solution.

Claims

1. A rapid shearing device for multi-angle core structural surfaces, characterized in that, It includes a base and a data acquisition module, wherein the upper surface of the base is provided with a horizontal shearing module and a vertical shearing module; The transverse shearing module includes two first guide rails that are transversely spaced on the upper surface of the base. A transverse slide plate is slidably arranged between the two first guide rails. A first drive source is arranged on one side of the transverse slide plate. The first drive source drives the transverse slide plate to slide along the length direction of the two first guide rails. A first core box with an adjustable position and angle is rotatably arranged on the transverse slide plate. The longitudinal shearing module includes two second guide rails that are longitudinally spaced apart on the upper surface of the base. A longitudinal slide plate is slidably arranged between the two second guide rails. A second drive source is arranged on one side of the longitudinal slide plate. The second drive source drives the longitudinal slide plate to slide along the length direction of the two second guide rails. A second core box with an adjustable position and angle is rotatably arranged on the longitudinal slide plate. Both the first core box and the second core box are provided with pressure strips extending outward for pressing the core sample. Both the transverse sliding plate and the longitudinal sliding plate are provided with fixing rods. Each fixing rod is rotatably provided with a fixing block. The adjacent end faces of the two fixing blocks abut against the two pressure strips through pads. Two parallel connecting rods are detachably and hinged between the two fixing blocks. The data acquisition module is used to collect the pressure and displacement of the first drive source and the second drive source in real time.

2. The rapid shearing device for multi-angle core structure surfaces according to claim 1, characterized in that, Each of the fixing blocks includes a rotating sleeve for fitting onto the fixing rod, and each rotating sleeve is provided with a hinge plate at the bottom and a pressing plate at the top for abutting against the pressure strip; the two ends of the two parallel connecting rods are detachably hinged to the two hinge plates respectively.

3. The rapid shearing device for multi-angle core structure surfaces according to claim 2, characterized in that, Each of the clamping plates is a cuboid structure with first threaded through holes on both sides of its end face to mate with fixing bolts. The two fixing bolts pass through the two first threaded through holes and are threadedly connected to the pad block.

4. The rapid shearing device for multi-angle core structure surfaces according to claim 2, characterized in that, The first core box and the second core box have the same structure, both including a box body for accommodating the core sample. The bottom of the box body is rotatably connected to the upper end face of the base. The box body is provided with a sliding groove and a mounting groove. The sliding groove and the mounting groove are both arranged towards one side wall of the box body. The cross-section of the sliding groove is T-shaped. The sliding groove is arranged along the length of the box body and passes through both ends of the box body. The pressure strip is slidably arranged in the sliding groove and the length of the pressure strip is greater than the length of the box body. The outer side of the pressure strip contacts the corresponding fixing block, and the inner side of the pressure strip contacts the outer wall of the core sample; the opening of the sliding groove is connected to the bottom of the mounting groove, the opening of the mounting groove is connected to one side wall of the box, a clamping block is provided at the opening of the mounting groove, and the four outer walls of the core sample are in close contact with the bottom of the mounting groove, the inner side of the pressure strip, and the inner side of the clamping block, respectively.

5. The rapid shearing device for multi-angle core structure surfaces according to claim 4, characterized in that, The lower end face of the box is provided with a rotating shaft and a T-shaped locking rod at intervals. The rotating shaft is rotatably connected to the upper end face of the base. The upper end face of the base is provided with an arc-shaped groove. The center of the arc-shaped groove coincides with the axis of the rotating shaft. The cross-section of the arc-shaped groove is T-shaped. The T-shaped locking rod is slidably engaged with the arc-shaped groove.

6. The rapid shearing device for multi-angle core structure surfaces according to claim 5, characterized in that, The T-shaped locking rod includes a rod body, which is threadedly connected to the second threaded through hole of the box body. The top of the rod body is provided with a hexagonal countersunk hole, and the bottom of the rod body is provided with a flange located in the arc-shaped groove.

7. The rapid shearing device for multi-angle core structure surfaces according to claim 6, characterized in that, A rubber pad is provided on the top surface of the flange.

8. The rapid shearing device for multi-angle core structure surfaces according to claim 4, characterized in that, The bottom of the mounting groove, the inner side of the pressure strip, and the inner side of the clamping block are straight or curved surfaces.

9. The rapid shearing device for multi-angle core structure surfaces according to claim 4, characterized in that, An oil pump is installed inside the base. Both the first drive source and the second drive source are oil cylinders. The oil pump is connected to the first drive source and the second drive source respectively through hydraulic pipes and flow dividers.

10. The rapid shearing device for multi-angle core structure surfaces according to claim 9, characterized in that, The data acquisition module includes two pressure sensors, two displacement sensors, and a display, all of which are electrically connected to the host computer. The two pressure sensors are respectively installed on the pipes of the first driving source and the second driving source, and are used to collect the pressure of the first driving source and the second driving source in real time; The two displacement sensors are respectively mounted on the transverse slide and the longitudinal slide, and are used to collect the displacement of the first drive source and the second drive source in real time; The display is used to show the pressure and displacement of the first and second driving sources in real time.

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