Multi-angle rock core structural surface rapid shearing device and test method

Abstract

The invention discloses a multi-angle rock core structural surface rapid shearing device and a test method, and belongs to the technical field of rock core structural surface testing.The multi-angle rock core structural surface rapid shearing device comprises a base and a data acquisition module, and a transverse shearing module and a longitudinal shearing module are arranged on the base; each of the transverse shearing module and the longitudinal shearing module comprises a rock core box with an adjustable position angle, the rock core boxes can be accurately matched with the dip angle of the rock core sample structural surface, and the rock core sample structural surface obtained by field drilling can be accurately sheared according to preset parameters, so that the manufacturing efficiency of the rock core sample is improved; meanwhile, the data acquisition module can record mechanical parameters summarized in the shearing process in real time, such as shear strength, shear displacement and shear stress, so that the shear test efficiency of the rock core structural surface is improved, and the manufacturing time of the rock core sample is shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of core structural surface testing, and in particular relates to a multi-angle core structural surface rapid shearing device and a testing method. Background Art

[0002] The rock (body) structural surface refers to a two-dimensional geological interface with a certain direction, large extension and small thickness formed and continuously developed by various structural relics (including faults, joints, bedding and fracture zones) of the rock (body) under the action of tectonic stress. The shear strength of the rock (body) refers to the maximum shear stress that the rock (body) can withstand when it is destroyed under the action of shear load. The shear strength parameter is one of the important parameters affecting the stability analysis and design of geotechnical engineering such as slope excavation, tunnel construction and underground chambers. It is mainly obtained by cutting the original rock into cubes or cylindrical specimens of specific sizes and conducting direct shear tests and rock triaxial and other indoor conventional tests. There are usually three types of rock shear strength tests: shear strength, shear strength and shear strength. The rock structure surface is essentially a test in which two rock specimens are subjected to horizontal loads under normal loads to cause horizontal displacement along the close surface. The shear displacement surface is an existing surface without cohesive force. Its shear strength is only the friction force related to the normal load and the internal friction angle (coefficient).

[0003] Since there is a certain angle between the structural surface and the horizontal plane (structural surface inclination), the traditional conventional rock mechanics test method requires the preparation of appropriate specimens according to the size of the inclination before sample preparation to ensure that the applied vertical load is perpendicular to the structural surface and the shear stress is parallel to the structural surface. Therefore, there are problems such as sample preparation and testing being time-consuming and labor-intensive, sample preparation being easily affected by the technical level of the operator, and the inability to meet the demand for rapid shear testing of a large number of rock specimens. Especially in geotechnical engineering construction projects that require frequent assessment of rock mechanical properties, conventional shear tests have certain limitations.

[0004] The core shearing device in the prior art needs to dig fresh rocks with structural surfaces on site, and then cut them to form a sample that meets the test size requirements. The rock is poured into a specific shear box (cube or cylinder) with concrete to form a standard specimen. After the concrete is cured, the shear test is carried out along the structural surface. However, the concrete curing takes a long time, which leads to a long test cycle for the shear specimen. Summary of the invention

[0005] In view of the deficiencies in the above-mentioned background technology, the present invention aims to provide a multi-angle core structure surface rapid shearing device and test method, which solves the problems that the existing core shearing device needs to first cast concrete into a specific shape of sample before conducting a shear test, has low work efficiency, time-consuming and labor-intensive sample preparation, and is greatly affected by the level of the sample maker.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows: A multi-angle core structural surface rapid shearing device is provided, which comprises a base and a data acquisition module, wherein the data acquisition module comprises a pressure sensor, a displacement sensor and a display electrically connected to each other; The upper end surface of the base is provided with a transverse shearing module and a longitudinal shearing module; the transverse shearing module comprises two first guide rails which are arranged at intervals on the upper end surface of the base in a transverse direction, a transverse slide plate is slidably arranged between the two first guide rails, a first driving source is arranged on one side of the transverse slide plate, the first driving source drives the transverse slide plate to slide along the length direction of the two first guide rails, and a first core box with adjustable position angle is rotatably arranged on the transverse slide plate; The longitudinal shearing module comprises two second guide rails longitudinally spaced apart and arranged on the upper end surface of the base, a longitudinal slide is slidably arranged between the two second guide rails, a second driving source is arranged on one side of the longitudinal slide, the second driving source drives the longitudinal slide to slide along the length direction of the two second guide rails, and a second core box with adjustable position angle is rotatably arranged on the longitudinal slide; The pressure sensor and the displacement sensor are used to respectively collect the pressure and displacement of the first driving source and the second driving source in real time, and the display is used to display the pressure and displacement of the first driving source and the second driving source in real time.

[0007] The basic principle of the multi-angle core structural surface rapid shearing device in the present invention is: by arranging a transverse shearing module and a longitudinal shearing module with adjustable position angles on the base, the angles of the core samples in the core box of the transverse shearing module and the longitudinal shearing module can be adjusted, the inclination angle of the core sample structural surface can be accurately matched, and the core sample structural surface obtained by on-site drilling can be accurately sheared according to preset parameters, thereby improving the production efficiency of the core sample. At the same time, the data acquisition module can record the mechanical parameters summarized in the shearing process in real time, such as shear strength, shear displacement and shear stress, thereby improving the efficiency of the core structural surface shearing test and reducing the production time of the core sample.

[0008] Furthermore, as a specific setting method of the first core box, a first core sample is arranged in the first core box, and the first core box includes a box body with a bottom rotatably connected to the upper end face of the base, a slide groove and a mounting groove are arranged inside the box body, and the slide groove and the mounting groove are both arranged in the direction of the side wall of one side of the box body, the cross-section of the slide groove is a T-shaped structure, the slide groove is arranged along the length direction of the box body and passes through the two end faces of the box body, and a pressure strip with a T-shaped cross-section is slidably arranged in the slide groove, the length of the pressure strip is greater than the length of the box body, the outer side surface of the pressure strip is in contact with the first pressure strip fixing device, and the inner side surface of the pressure strip is in contact with the outer wall of the first core sample; the opening of the slide groove is connected to the bottom of the mounting groove, the opening of the mounting groove is connected to the side wall of one side of the box body, and a clamping block is arranged at the opening of the mounting groove, and the outer walls around the first core sample are in tight contact with the bottom of the mounting groove, the inner side surface of the pressure strip and the inner side surface of the clamping block respectively.

[0009] In the above technical solution, the function of the slide groove is to slide and install the pressure strip, one end of which can slide to the vicinity of the first core sample structural surface, thereby playing a resisting role on the first core sample structural surface; the function of the installation groove and the clamping block is to fix the entire first core sample inside the box body, thereby playing a role of fixed installation.

[0010] Furthermore, as a specific setting method for adjusting the position angle of the first core box, a rotating shaft and a locking rod are arranged at intervals on the lower end surface of the box body, and the rotating shaft is rotatably connected to the upper end surface of the base; an arc groove is arranged on the upper end surface of the base, the center of the arc groove coincides with the axis of the rotating shaft, and the locking rod cooperates with the arc groove.

[0011] In the above technical solution, the length of the arc groove can be set so that the position angle of the first core box and the first core sample therein can be adjusted within the range of 20 to 90 degrees.

[0012] Furthermore, the structure of the second core box is the same as that of the first core box; a second core sample is arranged in the second core box, and the outer side surface of the layering strip in the second core box is in contact with the second layering strip fixing device.

[0013] Furthermore, the first bead fixing device and the second bead fixing device both include a vertically arranged fixing rod, a fixing block is rotatably arranged on the fixing rod, and a cushion block is arranged between one side surface of the fixing block and the outer side surface of the bead. In the above technical solution, by arranging the fixing block and the cushion block, the bead is supported to prevent displacement of the bead during the shearing process.

[0014] Furthermore, an oil pump is arranged in the base, the first driving source and the second driving source are both oil cylinders, and the oil pump is connected to the first driving source and the second driving source respectively through a hydraulic pipe and a diverter valve.

[0015] Furthermore, the bottom of the mounting groove, the inner side surface of the pressure strip and the inner side surface of the clamping block are straight surface or arc surface structures, which can be flexibly selected according to the shape of the core sample. When the core sample is a cylindrical structure, the bottom of the mounting groove, the inner side surface of the pressure strip and the inner side surface of the clamping block are arc surface structures; when it is a square column structure, the bottom of the mounting groove, the inner side surface of the pressure strip and the inner side surface of the clamping block are straight surface structures.

[0016] Furthermore, a protective cover is provided on the top of the base. When a shear test is performed on a core sample, the protective cover can prevent the core sample from splashing, thereby protecting the test personnel.

[0017] Furthermore, the present invention also provides a test method for a multi-angle core structure surface rapid shearing device, which comprises: Step 1: Place the second core sample in the second core box, adjust the position angle of the second core box relative to the longitudinal slide, make the structural surface of the second core sample parallel to the vertical surface, lock the current position of the second core box, and slide one end of the layering strip to the vicinity of the structural surface of the second core sample; Step 2: Place the first core sample in the first core box, adjust the position angle of the first core box relative to the transverse slide, align the structural surface of the first core sample with the structural surface of the second core sample, lock the current position of the first core box, and slide one end of the layering strip to the vicinity of the structural surface of the first core sample; Step 3, starting the first driving source and the second driving source, and performing a shear test on the first core sample and the second core sample according to a preset pressure magnitude and shear rate; Step 4: During the shear test, the pressure sensor and the displacement sensor are used to respectively collect the pressure and displacement of the first driving source and the second driving source in real time, and upload the collected data to the background system for storage; Step 5, record the pressure of the second driving source as normal stress F1, and record the pressure of the first driving source as shear stress F2; ​​record the longitudinal displacement of the second driving source as normal displacement S1, and record the transverse displacement of the first driving source as shear displacement S2; draw the shear stress-shear displacement relationship curve under different normal stresses according to the normal stress F1, shear stress F2 and shear displacement S2, and complete the shear test of the core structural surface.

[0018] The beneficial effects of the present invention are: 1. A multi-angle core structural surface rapid shearing device and test method in the present invention, by arranging a transverse shearing module and a longitudinal shearing module with adjustable position angles on a base, can adjust the angles of core samples in the core boxes of the transverse shearing modules and the longitudinal shearing modules, can accurately match the inclination angles of the structural surfaces of the core samples, can directly use the cores drilled out from the engineering survey site to carry out structural surface shear tests, and there is no need to pour concrete for sample preparation, thereby improving the efficiency of the core structural surface shear test and reducing the production time of the core samples.

[0019] 2. A multi-angle core structural surface rapid shearing device and test method in the present invention, the data acquisition module can record and display the mechanical parameters summarized in the shearing process in real time, such as shear strength, shear displacement and shear stress, etc., to improve the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of a multi-angle core structure surface rapid shearing device.

[0021] Figure 2 It is a schematic diagram of the top view of a multi-angle core structure surface rapid shearing device.

[0022] Figure 3 Schematic diagram of the three-dimensional structure of the first core box.

[0023] Among them, 1. base; 2. pressure sensor; 3. displacement sensor; 4. display; 5. transverse shear module; 6. longitudinal shear module; 7. first guide rail; 8. transverse slide; 9. first drive source; 10. first core box; 11. second guide rail; 12. longitudinal slide; 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. locking rod; 22. arc groove; 23. second core sample; 24. fixing rod; 25. fixing block; 26. oil pump; 27. hydraulic pipe; 28. diverter valve; 29. ​​second drive source. DETAILED DESCRIPTION

[0024] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0025] like Figure 1~Figure 3As shown, the present invention provides a multi-angle core structure surface rapid shearing device, which includes a base 1 and a data acquisition module, and the data acquisition module includes a pressure sensor 2, a displacement sensor 3 and a display 4 that are electrically connected to each other.

[0026] The upper end surface of the base 1 is provided with a transverse shearing module 5 and a longitudinal shearing module 6; the transverse shearing module 5 includes two first guide rails 7 which are laterally spaced and arranged on the upper end surface of the base 1, a transverse slide 8 is slidably arranged between the two first guide rails 7, a first driving source 9 is arranged on one side of the transverse slide 8, the first driving source 9 drives the transverse slide 8 to slide along the length direction of the two first guide rails 7, and a first core box 10 with adjustable position angle is rotatably arranged on the transverse slide 8.

[0027] The longitudinal shear module 6 includes two second guide rails 11 longitudinally spaced apart and arranged on the upper end surface of the base 1, a longitudinal slide 12 is slidably arranged between the two second guide rails 11, a second driving source 29 is arranged on one side of the longitudinal slide 12, the second driving source 29 drives the longitudinal slide 12 to slide along the length direction of the two second guide rails 11, and a second core box 13 with adjustable position angle is rotatably arranged on the longitudinal slide 12.

[0028] The pressure sensor 2 and the displacement sensor 3 are used to respectively collect the pressure and displacement of the first driving source 9 and the second driving source 29 in real time, and the display 4 is used to display the pressure and displacement of the first driving source 9 and the second driving source 29 in real time.

[0029] By arranging the transverse shear module 5 and the longitudinal shear module 6 with adjustable position angles on the base 1, the angles of the core samples in the core box of the transverse shear module 5 and the longitudinal shear module 6 can be adjusted, and the inclination angle of the structural surface of the core sample can be accurately matched. The cores drilled out from the engineering survey site can be directly used to carry out structural surface shear tests without pouring concrete for sample preparation, thereby improving the efficiency of the core structural surface shear test and reducing the production time of the core sample.

[0030] like Figure 3As shown, preferably but not limited to, as a specific arrangement of the first core box 10, a first core sample 14 is arranged in the first core box 10, and the first core box 10 includes a box body 15 whose bottom is rotatably connected to the upper end surface of the base 1, and a slide groove 16 and an installation groove 17 are arranged inside the box body 15, and the slide groove 16 and the installation groove 17 are arranged in the direction of the side wall of one side of the box body 15, and the cross section of the slide groove 16 is a T-shaped structure, and the slide groove 16 is arranged along the length direction of the box body 15 and passes through the two end surfaces of the box body 15, and a slide groove 16 is slidably arranged in the slide groove 16. The cross section of the pressure strip 18 is a T-shaped structure, the length of the pressure strip 18 is greater than the length of the box body 15, the outer side surface of the pressure strip 18 is in contact with the first pressure strip 18 fixing device, and the inner side surface of the pressure strip 18 is in contact with the outer wall of the first core sample 14; the opening of the slide 16 is connected to the bottom of the installation groove 17, the opening of the installation groove 17 is connected to the side wall of one side of the box body 15, and a clamping block 19 is provided at the opening of the installation groove 17. The outer walls of the first core sample 14 are in close contact with the bottom of the installation groove 17, the inner side surface of the pressure strip 18 and the inner side surface of the clamping block 19. In the above technical solution, the role of the slide 16 is to slide and install the pressure strip 18, and one end of the pressure strip 18 can slide to the vicinity of the structural surface of the first core sample 14, and play a role in resisting the structural surface of the first core sample 14; the role of the installation groove 17 and the clamping block 19 is to fix the entire first core sample 14 inside the box body 15, and play a role in fixed installation.

[0031] Specifically, the bottom of the mounting groove 17, the inner side surface of the pressure strip 18 and the inner side surface of the clamping block 19 are straight surfaces or arc-shaped curved surface structures, which can be flexibly selected according to the shape of the core sample. When the core sample is a cylindrical structure, the bottom of the mounting groove 17, the inner side surface of the pressure strip 18 and the inner side surface of the clamping block 19 are arc-shaped curved surface structures; when it is a square columnar structure, the bottom of the mounting groove 17, the inner side surface of the pressure strip 18 and the inner side surface of the clamping block 19 are straight surface structures.

[0032] like Figure 2 and Figure 3 As shown, a specific setting mode of the first core box 10 with adjustable position angle is provided, the lower end surface of the box body 15 is provided with a rotating shaft 20 and a locking rod 21 at intervals, the rotating shaft 20 is rotatably connected with the upper end surface of the base 1; the upper end surface of the base 1 is provided with an arc groove 22, the center of the arc groove 22 coincides with the axis of the rotating shaft 20, and the locking rod 21 cooperates with the arc groove 22. In the above technical solution, the length of the arc groove 22 can be set so that the first core box 10 and the first core sample 14 therein can be adjusted in the range of 20 to 90 degrees.

[0033] Specifically, the structure of the second core box 13 is the same as that of the first core box 10 ; a second core sample 23 is arranged in the second core box 13 , and the outer side surface of the pressure strip 18 in the second core box 13 is in contact with the second pressure strip fixing device.

[0034] Preferably, but not limited to, the first bead fixing device and the second bead fixing device both include a vertically arranged fixing rod 24, a fixing block 25 is rotatably arranged on the fixing rod 24, and a cushion block is arranged between one side surface of the fixing block 25 and the outer side surface of the bead 18. In the above technical solution, by arranging the fixing block 25 and the cushion block, the bead 18 is supported to prevent displacement of the bead 18 during the shearing process.

[0035] Specifically, an oil pump 26 is disposed in the base 1 , and the first driving source 9 and the second driving source 29 are both oil cylinders. The oil pump 26 is connected to the first driving source 9 and the second driving source 29 through a hydraulic pipe 27 and a diverter valve 28 , respectively.

[0036] Preferably, a protective cover is provided on the top of the base 1. When a shear test is performed on a core sample, the protective cover can prevent the core sample from splashing, thereby protecting the test personnel.

[0037] The present invention also provides a test method for a multi-angle core structure surface rapid shearing device, which comprises: Step 1: Place the second core sample 23 in the second core box 13, adjust the position angle of the second core box 13 relative to the longitudinal slide 12, make the structural surface of the second core sample 23 parallel to the vertical surface, lock the current position of the second core box 13, and slide one end of the pressure strip 18 to the vicinity of the structural surface of the second core sample 23; Step 2: Place the first core sample 14 in the first core box 10, adjust the position angle of the first core box 10 relative to the transverse slide 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; Step 3, starting the first driving source 9 and the second driving source 29, and performing a shear test on the first core sample 14 and the second core sample 23 according to a preset pressure magnitude and shear rate; Step 4: During the shear test, the pressure sensor 2 and the 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, respectively, and upload the collected data to the background system for storage; Step 5, record the pressure of the second driving source 29 as normal stress F1, and record the pressure of the first driving source 9 as shear stress F2; ​​record the longitudinal displacement of the second driving source 29 as normal displacement S1, and record the transverse displacement of the first driving source 9 as shear displacement S2; draw the shear stress-shear displacement relationship curve under different normal stresses according to the normal stress F1, shear stress F2 and shear displacement S2, and complete the shear test of the core structure surface.

Claims

1. A multi-angle core structure surface rapid shearing device, It is characterized in that It includes a base and a data acquisition module, wherein the data acquisition module includes a pressure sensor, a displacement sensor and a display which are electrically connected to each other; The upper end surface of the base is provided with a transverse shearing module and a longitudinal shearing module; the transverse shearing module comprises two first guide rails which are arranged at intervals on the upper end surface of the base in a transverse direction, a transverse slide plate is slidably arranged between the two first guide rails, a first driving source is arranged on one side of the transverse slide plate, the first driving source drives the transverse slide plate to slide along the length direction of the two first guide rails, and a first core box with adjustable position angle is rotatably arranged on the transverse slide plate; The longitudinal shearing module comprises two second guide rails longitudinally spaced apart and arranged on the upper end surface of the base, a longitudinal slide is slidably arranged between the two second guide rails, a second driving source is arranged on one side of the longitudinal slide, the second driving source drives the longitudinal slide to slide along the length direction of the two second guide rails, and a second core box with adjustable position angle is rotatably arranged on the longitudinal slide; The pressure sensor and the displacement sensor are used to respectively collect the pressure and displacement of the first driving source and the second driving source in real time, and the display is used to display the pressure and displacement of the first driving source and the second driving source in real time.

2. The multi-angle core structure surface rapid shearing device according to claim 1, It is characterized in that The first core box is provided with a first core sample, the first core box comprises a box body whose bottom is rotatably connected to the upper end face of the base, a slide groove and a mounting groove are provided inside the box body, and the slide groove and the mounting groove are both arranged in the direction of the side wall of one side of the box body, the cross section of the slide groove is a T-shaped structure, the slide groove is arranged along the length direction of the box body and passes through the two end faces of the box body, a pressure strip with a T-shaped cross section is slidably arranged in the slide groove, the length of the pressure strip is greater than the length of the box body, the outer side surface of the pressure strip is in contact with the first pressure strip fixing device, and the inner side surface of the pressure strip is in contact with the outer wall of the first core sample; the opening of the slide groove is connected with the bottom of the mounting groove, the opening of the mounting groove is connected with the side wall of one side of the box body, and a clamping block is provided at the opening of the mounting groove, and the outer walls around the first core sample are in tight contact with the bottom of the mounting groove, the inner side surface of the pressure strip and the inner side surface of the clamping block respectively.

3. The multi-angle core structure surface rapid shearing device according to claim 2, It is characterized in that The lower end surface of the box body is provided with a rotating shaft and a locking rod at intervals, and the rotating shaft is rotatably connected to the upper end surface of the base; the upper end surface of the base is provided with an arc groove, the center of the arc groove coincides with the axis of the rotating shaft, and the locking rod cooperates with the arc groove.

4. The multi-angle core structure surface rapid shearing device according to claim 3, It is characterized in that The structure of the second core box is the same as that of the first core box; a second core sample is arranged in the second core box, and the outer side surface of the layering strip in the second core box is in contact with the second layering strip fixing device.

5. The multi-angle core structure surface rapid shearing device according to claim 4, It is characterized in that The first pressure strip fixing device and the second pressure strip fixing device both include a vertically arranged fixing rod, a fixing block is rotatably arranged on the fixing rod, and a cushion block is arranged between one side surface of the fixing block and the outer side surface of the pressure strip.

6. The multi-angle core structure surface rapid shearing device according to claim 2, It is characterized in that An oil pump is arranged in the base, the first driving source and the second driving source are both oil cylinders, and the oil pump is connected to the first driving source and the second driving source respectively through a hydraulic pipe and a diverter valve.

7. The multi-angle core structure surface rapid shearing device according to claim 2, It is characterized in that The bottom of the installation groove, the inner side surface of the pressure strip and the inner side surface of the clamping block are straight surface or arc curved surface structures.

8. The multi-angle core structure surface rapid shearing device according to any one of claims 1 to 7, It is characterized in that A protective cover is arranged on the top of the base.

9. A test method based on the multi-angle core structure surface rapid shearing device according to any one of claims 2 to 8, It is characterized in that include: Step 1: Place the second core sample in the second core box, adjust the position angle of the second core box relative to the longitudinal slide, make the structural surface of the second core sample parallel to the vertical surface, lock the current position of the second core box, and slide one end of the layering strip to the vicinity of the structural surface of the second core sample; Step 2: Place the first core sample in the first core box, adjust the position angle of the first core box relative to the transverse slide, align the structural surface of the first core sample with the structural surface of the second core sample, lock the current position of the first core box, and slide one end of the layering strip to the vicinity of the structural surface of the first core sample; Step 3, starting the first driving source and the second driving source, and performing a shear test on the first core sample and the second core sample according to a preset pressure magnitude and shear rate; Step 4: During the shear test, the pressure sensor and the displacement sensor are used to respectively collect the pressure and displacement of the first driving source and the second driving source in real time, and upload the collected data to the background system for storage; Step 5, record the pressure of the second driving source as normal stress F1, and record the pressure of the first driving source as shear stress F2; ​​record the longitudinal displacement of the second driving source as normal displacement S1, and record the transverse displacement of the first driving source as shear displacement S2; draw the shear stress-shear displacement relationship curve under different normal stresses according to the normal stress F1, shear stress F2 and shear displacement S2, and complete the shear test of the core structural surface.

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