Method and device for simulating reserved shear seam sample of rock mass structural surface

Abstract

The invention relates to a method and a device for simulating a rock mass structural surface reserved shear seam sample, and relates to the field of simulation rock mass shear strength tests, the method comprises the following steps: S1, making a simulation structural panel, including the following steps: scanning a natural structural surface of a rock mass by using 3D scanning equipment to form structural surface feature data; the processor receives the structural surface feature data and processes the structural surface feature data to form a control signal; the 3D printer obtains the control signal and prints a simulation structure panel which is consistent with the rock mass structural surface and has the thickness; s2, a simulation structure panel is vertically placed in the pouring mold, and the simulation structure panel divides the pouring cavity into two single-side cavities; s3, concrete is poured into the single-side cavity; s4, after the concrete is solidified, separating the simulation test block from the single-side chamber; and S5, combining the test surfaces of the two simulation test blocks, and testing the shear strength of the structural surfaces of the two simulation test blocks. The method has the effect that the surface type of the structural surface is more accurate.

Description

Technical Field

[0001] This application relates to the field of simulated rock mass shear strength testing, and in particular to a method and apparatus for preparing samples with pre-reserved shear seams on simulated rock mass structural surfaces. Background Technology

[0002] In geotechnical engineering, the shear strength of rock mass structural surfaces is a key indicator for assessing rock mass stability, and it is of paramount importance for the design and construction of various geotechnical engineering projects such as tunnel engineering, slope engineering, and underground engineering. Accurately determining the shear strength of rock mass structural surfaces provides a solid guarantee for the safety and reliability of projects, and helps in the rational planning of project layout and optimization of design schemes.

[0003] Previously, to simulate rock mass structural surfaces and conduct shear strength tests, the simulated structural surfaces were typically created by hand carving. Technicians would use carving tools to carve a similar structure onto a slab based on experience and a general observation of the rock mass's structural surface. Another common method was to use simple mold casting. Concrete or other materials were poured into a pre-made mold with a specific texture to form a simulated test block.

[0004] However, these existing methods have significant drawbacks. Manual carving methods struggle to accurately reproduce the characteristics of natural rock mass structural surfaces, easily introducing large errors and resulting in low similarity between simulated test blocks and actual rock mass structural surfaces. Simple mold casting also fails to accurately capture the complex features of natural structural surfaces, causing inconsistencies between the test surfaces of simulated test blocks and the surface shapes of natural rock mass structural surfaces. This significantly reduces the accuracy of subsequent shear strength test results. Therefore, providing a more accurate structural surface shape is an urgent problem to be solved. Summary of the Invention

[0005] To provide a more accurate structural surface profile, this application provides a method and apparatus for testing the shear strength of simulated rock mass structural surfaces.

[0006] In a first aspect, this application provides a method for testing shear strength by simulating rock mass structural surfaces, employing the following technical solution: A method for testing shear strength by simulating rock mass structural surfaces includes the following steps: 3D scanning equipment is used to scan the natural structural surfaces of the rock mass to generate structural surface feature data; The processor receives the structural surface feature data and processes it to form a control signal; The 3D printer acquires the control signal and prints a simulated structural panel that is consistent with the rock mass structure and has thickness; S2: The simulated structure panel is placed vertically into the casting mold with the casting chamber, and the simulated structure panel divides the casting chamber into two unconnected single-sided chambers. S3: Pour concrete into the two single-sided chambers respectively; S4: After the concrete has solidified, each of the two single-sided chambers forms a simulated test block. Then, the simulated test block is separated from the single-sided chamber. The side of the simulated test block that contacts the simulated structure panel is the test surface. S5: Combine the test surfaces of the two simulated test blocks and perform shear strength tests on the structural surfaces of the two simulated test blocks.

[0007] By adopting the above technical solution, a simulated structural panel consistent with the rock mass structure is made using 3D scanning and printing technology. This panel is then placed in a casting mold to separate a single-sided chamber, and concrete is poured to form a simulated test block. After merging the test blocks and testing their surfaces, shear strength tests are conducted. This method can more accurately simulate the shear joints formed on natural rock masses, making the shear strength test results more accurate.

[0008] Optionally, S1 also includes: A clamping edge is printed on each of the two ends of the simulated structure panel, and the thickness of the clamping edge is the same as the thickness of the simulated structure panel.

[0009] By adopting the above technical solution, clamping edges of uniform thickness are printed on both ends of the simulated structure panel, which provides a basis for opening slots on the clamping edges and cooperating with the grooves and inserts in the device, thus facilitating the installation and fixation of the simulated structure panel in the casting mold.

[0010] Optionally, S1 also includes: Slots are provided on each of the two plates of the clamping edge, and the slots are located on the side of the clamping edge closest to the simulated structure panel; the slots are set parallel to the clamping edge.

[0011] By adopting the above technical solution, it is convenient to fit the inserts on the side formwork into the slots in the device, and to prevent concrete from entering the slots when the side formwork slides and adjusts its posture.

[0012] Secondly, this application provides a sample preparation device for simulating pre-reserved shear joints on a rock mass structural surface, employing the following technical solution: A sample preparation device for simulating pre-reserved shear joints on a rock mass structural surface includes a casting mold, wherein the casting mold comprises: Two side molds, the side molds comprising: A bottom template, wherein the bottom template is perpendicular to the first direction; Two side templates, the side templates being perpendicular to the second direction and slidably connected to the bottom template along a third direction, with the side templates contacting the upper surface of the bottom template; the two side templates are spaced apart in the second direction; and An end template is perpendicular to a third direction. Each side template is provided on both sides of the end template and is fixedly connected to the side template. The end template and the two side templates enclose the single-sided cavity. When the side templates in the two side molds are spliced ​​together, the single-sided cavities in the two side molds are spliced ​​together to form the casting cavity. The simulated structure panel is located within the casting chamber to divide the casting chamber into two single-sided chambers.

[0013] By adopting the above technical solution, concrete can be poured into a single-sided cavity to obtain a simulated test block. Since the concrete is in contact with the simulated structural surface, the test surface of the subsequent simulated test block is consistent with the natural structural surface. By merging the test surfaces of the two simulated test blocks and conducting shear strength tests, the shear resistance of the natural rock mass structural surface can be simulated more accurately.

[0014] Optionally, the side template forming the wall of the single-sided chamber is the inner wall surface, the side template away from the end template is the end wall surface, and the side template has grooves communicating with the single-sided chamber at the edges of the inner wall surface and the end wall surface. When the two side molds are joined together to form the casting chamber, the groove is used for inserting the clamping edge of the outer periphery of the simulated structure panel.

[0015] By adopting the above technical solution, the simulated structure panel can be inserted into the groove, which allows the simulated structure surface to be installed more accurately in the casting chamber.

[0016] Optionally, the side template has a protruding insert on the inner wall of the groove facing away from the end template, and the slot on the clamping edge is used for the insertion of the insert.

[0017] By adopting the above technical solution, clamping edges are printed on both ends of the simulated structural panel and slots are opened on them. At the same time, insert strips are protruding from the inner wall of the side template groove to fit and insert into it. The side template can slide along the bottom template. During the sliding process, the concrete collapses downward, reducing the gap between the concrete and the simulated structural panel, making the concrete fit the simulated structural panel better, and making the test surface formed by the subsequent test block fit the structure surface of the natural rock better, thus improving the accuracy of the shear strength test results.

[0018] Optionally, it also includes a tightening component, with each side template having a corresponding tightening component on the side away from the casting chamber; each end template has a corresponding connecting seat fixedly connected to it, with the two connecting seats extending to the side of the two side templates away from each other, and the tightening component connecting between the connecting seats on the two end templates; The tightening component includes: A screw, with each end of the screw passing through one of the connecting seats; Gaskets, each end of the screw is fitted with a corresponding gasket, the gaskets being located on the side of the two end templates that are far apart from each other; and Nuts are threadedly connected to both ends of the screw, and washers are sandwiched between the nuts and the connecting seat.

[0019] By adopting the above technical solution, the connecting seats on both sides of the connecting end template are connected by the tightening assembly composed of screws, washers and nuts, which can fix the two side molds together, ensuring that the relative position between the side molds is stable during operations such as pouring concrete into a single-sided cavity, making the device structure more stable.

[0020] Optionally, it also includes an upper pressure plate, which is perpendicular to the first direction. Each of the single-sided chambers is provided with an upper pressure plate, which is used to seal the top of the single-sided chamber.

[0021] By adopting the above technical solution, the top of the single-sided chamber can be sealed by the upper pressure plate, which can make the concrete in the single-sided chamber more compact.

[0022] Optionally, the side wall of the upper pressure plate near the simulated structure panel is a first side wall. A groove is provided at the edge formed by the first side wall and the lower plate surface of the upper pressure plate. A flexible insert is embedded in the groove, and the flexible insert extends to the outside of the first side wall near the simulated structure panel.

[0023] By adopting the above technical solution, a flexible insert strip is embedded in the upper pressure plate. The insert strip contacts the simulated structure panel, which can prevent concrete from overflowing from the contact point between the upper pressure plate and the simulated structure panel.

[0024] Optionally, a handle is fixedly connected to the upper surface of the upper pressure plate.

[0025] By adopting the above technical solution, the handle fixedly connected to the upper platen is easy for people to hold and the position of the upper platen can be easily adjusted.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The natural structural surface is scanned by a 3D scanning device and a simulated structural panel is printed by a 3D printer. This makes the test surface of the simulated test block consistent with the surface shape of the natural rock mass structure, which can more accurately simulate the shear joints on the natural rock mass and improve the accuracy of the shear strength test results. 2. The side formwork can slide along the bottom formwork, which can reduce the gap between the concrete and the simulated structure panel, making the concrete fit the simulated structure panel better, and making the test surface of the test block fit the structure surface of the natural rock better. 3. The tightening assembly can fix the two side molds, ensuring the stability of the device and facilitating concrete pouring. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the simulated structural panel and clamping edge in the embodiments of this application; Figure 2 yes Figure 1 Enlarged view of section A; Figure 3 This is a schematic diagram of the structure of two single-sided molds spliced ​​together in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a single-sided mold in an embodiment of this application; Figure 5 yes Figure 4 Enlarged view of section B; Figure 6 yes Figure 3 Enlarged view of section C; Figure 7 yes Figure 3 Enlarged view of section D; Figure 8 This is a schematic diagram of the upper pressure plate and handle in an embodiment of this application; Figure 9 This is a schematic diagram of the upper pressure plate and flexible insert in the embodiments of this application.

[0028] Explanation of reference numerals in the attached drawings: 1. Simulated structure panel; 11. Clamping edge; 111. Slot; 2. Side mold; 21. Bottom template; 211. Slide groove; 22. Side template; 221. Slider; 222. Inner wall surface; 223. End wall surface; 224. Groove; 23. End template; 231. Connecting seat; 24. Insert; 25. Single-sided chamber; 3. Tightening assembly; 31. Screw; 32. Washer; 33. Nut; 4. Upper pressure plate; 41. First side wall; 42. Insert groove; 43. Handle; 5. Flexible insert. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail. For ease of description, this application introduces directional terms such as first direction, second direction, and third direction to form a three-dimensional reference direction. The directional terms used, such as "first direction, second direction, and third direction", can be specifically referred to in the figure, where X represents the first direction, Y represents the second direction, and Z represents the third direction. The first direction, second direction, and third direction are perpendicular to each other. In this application, the first direction specifically refers to the vertical direction.

[0030] This application discloses a method for testing shear strength by simulating rock mass structural surfaces. (Refer to...) Figure 1 and Figure 2 The method for testing shear strength by simulating rock mass structural surfaces includes the following steps: S1: Create the simulation structure panel 1, including the following steps: The natural structural surfaces of the rock mass are scanned using 3D scanning equipment to form structural surface feature data, which includes three-dimensional coordinate data of each point on the natural structural surface. The processor receives structural surface feature data and processes it to form control signals. Specifically, the processor processes the three-dimensional coordinate data of each point on the natural structural surface to form control signals. The 3D printer acquires control signals and prints a simulated structural panel 1 that is consistent with the rock mass structure and has thickness. During the printing process, based on three-dimensional coordinate data, it can print a structure in three-dimensional space that is consistent with the surface shape of the natural structural surface and has a certain thickness, thus forming the simulated structural panel 1. The thickness of each point of the simulated structural panel 1 is consistent, that is, the surface shape of the two panels of the simulated structural panel 1 is consistent with the surface shape of the natural structural surface. When printing the simulated structure panel 1, a clamping edge 11 is printed on each of the two ends of the simulated structure panel 1. The thickness of the clamping edge 11 is the same as the thickness of the simulated structure panel 1. In other words, the simulated structure panel 1 is located between the two clamping edges 11. When the simulated structure panel 1 is placed vertically, the two clamping edges 11 are located on both sides of the simulated structure panel 1 in the vertical direction; two slots 111 are provided on each of the two plates of the clamping edges 11. The slots 111 are located on the side of the clamping edges 11 closer to the simulated structure panel 1, and the slots 111 are parallel to the clamping edges 11, that is, the slots 111 are set vertically. S2: The simulated structure panel 1 is placed vertically into the casting mold with the casting chamber, and the simulated structure panel 1 divides the casting chamber into two unconnected single-sided chambers 25. S3: Pour concrete into the two single-sided chambers 25 respectively; S4: After the concrete has solidified, each of the two single-sided chambers 25 forms a simulated test block. The simulated test blocks are then separated from the single-sided chambers 25. The side of the simulated test block that contacts the simulated structural panel 1 is the test surface. Since the test surfaces of the two simulated test blocks are the same as the surface shape formed after contacting the simulated structural panel 1, the surface shapes of the test surfaces on the two simulated test blocks are consistent. S5: Merge the test surfaces of the two simulated test blocks and perform shear strength tests on the structural surfaces of the two simulated test blocks. Since the two test surfaces have the same shape, they can be merged into a close-fitting position to simulate the shear joint formed on the natural rock mass. The results of the subsequent shear strength test will be more accurate.

[0031] This application also discloses an apparatus for the aforementioned method of preparing samples with reserved shear joints on simulated rock mass structural surfaces. (Refer to...) Figure 3The simulated rock mass structure surface reserved shear joint sample preparation device includes a casting mold, which includes two side molds 2, and the side molds 2 include a bottom template 21, two side templates 22 and an end template 23. The bottom template 21 is perpendicular to the first direction, and the side template 22 is perpendicular to the second direction. The two side templates 22 are spaced apart in the second direction. The side templates 22 overlap the upper surface of the bottom template 21 so that the side templates 22 and the upper surface of the bottom template 21 are in contact. The side templates 22 are slidably connected to the bottom template 21 in a third direction. Specifically, two dovetail-shaped grooves 211 are provided on the upper surface of the bottom template 21 in a third direction. Each side template 22 has a corresponding dovetail-shaped slider 221 fixedly connected to its bottom. The slider 221 is adapted to be located in the groove 211 so that it can move in the third direction under the guidance of the inner wall of the groove 211. The side template 22 and the slider 221 can move synchronously in the third direction. The end template 23 is perpendicular to the third direction. Each side template 22 is provided on both sides of the end template 23 and is fixedly connected to the side template 22. The end template 23 and the two side templates 22 form a single-sided chamber 25. When the side templates 22 in the two side molds 2 are spliced ​​together, the single-sided chambers 25 in the two side molds 2 are spliced ​​together to form a casting chamber. The simulated structure panel 1 is placed in the casting chamber, which can divide the casting chamber into two single-sided chambers 25.

[0032] During the operation, the two side molds 2 are spliced ​​together to form a casting chamber. Then, the simulated structure panel 1 is placed into the casting chamber to form two single-sided chambers 25. Subsequently, concrete can be poured in each single-sided chamber 25.

[0033] Reference Figure 4 , Figure 5 and Figure 6 The side template 22 forms the inner wall 222 of the single-sided chamber 25, and the side template 22 away from the end template 23 forms the end wall 223. The side template 22 forms a groove 224 at the edge of the inner wall 222 and the end wall 223 that communicates with the single-sided chamber 25. The groove 224 is used to accommodate the clamping edge 11. Specifically, when the two side molds 2 are spliced ​​to form a casting chamber, the groove 224 is used for the clamping edge 11 of the outer periphery of the simulated structure panel 1 to be inserted. The side template 22 has a protruding insert 24 on the inner wall of the groove 224 facing away from the end template 23. In the second direction, the wall of the insert 24 near the single-sided chamber 25 is coplanar with the inner wall 222 of the side template 22, and the insert 24 away from the single-sided chamber 25 avoids forming a gap with the inner wall of the groove 224. The slot 111 on the clamping edge 11 is used for the insertion of the insert 24. During the operation, after pouring concrete into the single-sided chamber 25, the side template 22 can be slid back and forth along the bottom template 21 to adjust the side template 22 between the contact posture and the separation posture. When the side template 22 is in the contact posture, the end wall surfaces 223 of the two side templates 22 are in contact. When the side template 22 is in the separation posture, in the third direction, a gap is formed between the insert 24 and the inner wall of the slot 111. At this time, the insert 24 is not completely separated from the slot 111, which can ensure that the side template 22 moves while preventing concrete from entering the slot 111. During the back and forth movement of the side template 22, the concrete will collapse downward, reducing the gap between the concrete and the simulated structure panel 1, making the concrete fit the simulated structure panel 1 better, and making the test surface formed by the subsequent simulated test block fit the structure surface of the natural rock better.

[0034] Reference Figure 7 In some embodiments of this application, a tightening component 3 is also included. Each side template 22 away from the casting chamber is provided with a tightening component 3. That is, in the second direction, the casting chamber and the side template 22 are located between two tightening components 3. In order to install the tightening component 3, each side of the end template 23 is fixedly connected with a connecting seat 231. In the second direction, the two connecting seats 231 extend to the side of the two side templates 22 away from each other. The tightening component 3 is connected between the connecting seats 231 on the two end templates 23. The tightening assembly 3 includes a screw 31, a washer 32, and a nut 33. The screw 31 is parallel to a third direction, and each end of the screw 31 passes through a connecting seat 231. A washer 32 is fitted on each end of the screw 31, and the washer 32 is located on the side of the two end templates 23 that are far apart from each other. A nut 33 is threadedly connected to each end of the screw 31, and the washer 32 is clamped between the nut 33 and the connecting seat 231. When it is necessary to fix the two side molds 2, the screw 31 is passed through the connecting seats 231 on both sides of the two end templates 23, and then the washer 32 is fitted on both ends of the screw 31. Finally, the washer 32 is clamped between the nut 33 and the connecting seat 231 by the nut 33, so that the two side molds 2 can be fixed.

[0035] Reference Figure 8 and Figure 9 In order to compact the concrete in the single-sided chamber 25 more tightly, in some embodiments of this application, an upper pressure plate 4 is also included. The upper pressure plate 4 is perpendicular to the first direction. Each single-sided chamber 25 is provided with an upper pressure plate 4. The upper pressure plate 4 is used to seal the top of the single-sided chamber 25. Since the surface of the simulated structure panel 1 is uneven, in order to fit the simulated structure panel 1 better, a flexible insert 5 is also connected to the upper pressure plate 4. Specifically, the side wall of the upper pressure plate 4 near the simulated structure panel 1 is the first side wall 41. A groove 42 is provided at the edge formed by the first side wall 41 and the lower plate surface of the upper pressure plate 4. The flexible insert 5 is embedded in the groove 42. The flexible insert 5 extends to the outside of the side of the first side wall 41 near the simulated structure panel 1. That is to say, after the upper pressure plate 4 is placed into the single-sided chamber 25, the three side walls of the upper pressure plate 4 contact the end template 23 and the two side templates 22 respectively, and the flexible insert 5 contacts the simulated structure panel 1, which can prevent concrete from overflowing from the contact point between the upper pressure plate 4 and the simulated structure panel 1. To facilitate adjustment of the position of the upper pressure plate 4, a handle 43 is fixedly connected to the upper surface of the upper pressure plate 4 for easy gripping by personnel.

[0036] The implementation principle of the simulated rock mass structure surface reserved shear joint sample preparation device in this application embodiment is as follows: concrete is added to the single-sided chamber 25, then the side template 22 is shaken, and finally, the upper pressure plate 4 is pressed down to compact the concrete; after the concrete solidifies, the upper pressure plate 4 is removed, and then the tightening component 3 is removed. Finally, the two side molds 2 are separated to obtain two simulated test blocks.

[0037] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for preparing samples with pre-reserved shear joints on simulated rock mass structural surfaces, characterized in that, Includes the following steps: S1: Create the simulated structure panel (1), including the following steps: 3D scanning equipment is used to scan the natural structural surfaces of the rock mass to generate structural surface feature data; The processor receives the structural surface feature data and processes it to form a control signal; The 3D printer acquires the control signal and prints a simulated structural panel (1) that is consistent with the rock mass structure and has thickness; S2: The simulated structure panel (1) is placed vertically into the casting mold with the casting chamber, and the simulated structure panel (1) divides the casting chamber into two unconnected single-sided chambers (25). S3: Pour concrete into the two single-sided chambers (25) respectively; S4: After the concrete solidifies, each of the two single-sided chambers (25) forms a simulated test block. The simulated test block is then separated from the single-sided chamber (25). The side of the simulated test block that contacts the simulated structure panel (1) is the test surface. S5: Combine the test surfaces of the two simulated test blocks and perform shear strength tests on the structural surfaces of the two simulated test blocks.

2. The method for preparing samples with pre-reserved shear joints on simulated rock mass structural surfaces according to claim 1, characterized in that, S1 also includes: A clamping edge (11) is printed on each of the two ends of the simulated structure panel (1), and the thickness of the clamping edge (11) is the same as the thickness of the simulated structure panel (1).

3. The method for preparing samples with pre-reserved shear joints on simulated rock mass structural surfaces according to claim 2, characterized in that, S1 also includes: Slots (111) are provided on each of the two plates of the clamping edge (11). The slots (111) are located on the side of the clamping edge (11) close to the simulated structure panel (1). The slots (111) are set parallel to the clamping edge (11).

4. A sample preparation device for pre-reserved shear joints on simulated rock mass structural surfaces, used for sample preparation of pre-reserved shear joints on simulated rock mass structural surfaces as described in claim 3, characterized in that, Includes a casting mold, the casting mold comprising: Two side molds (2), said side molds (2) comprising: A bottom template (21) is perpendicular to the first direction; Two side templates (22) are perpendicular to the second direction and are slidably connected to the bottom template (21) along the third direction, with the side templates (22) in contact with the upper surface of the bottom template (21); the two side templates (22) are spaced apart in the second direction; and An end template (23) is perpendicular to a third direction. Each side template (22) is provided on both sides of the end template (23) and is fixedly connected to the side template (22). The end template (23) and the two side templates (22) surround and form the single-sided chamber (25). When the side templates (22) in the two side molds (2) are spliced ​​together, the single-sided chambers (25) in the two side molds (2) are spliced ​​together to form the casting chamber. The simulated structure panel (1) is located within the casting chamber to divide the casting chamber into two single-sided chambers (25).

5. The device for preparing samples with pre-reserved shear joints on simulated rock mass structural surfaces according to claim 4, characterized in that, The side template (22) forms the inner wall (222) of the single-sided chamber (25), and the side template (22) away from the end template (23) forms the end wall (223). The side template (22) has grooves (224) at the edges of the inner wall (222) and the end wall (223) that communicate with the single-sided chamber (25). When the two side molds (2) are joined together to form the casting chamber, the groove (224) is used for the clamping edge (11) on the outer periphery of the simulated structure panel (1) to be inserted.

6. The device for preparing simulated rock mass structural surfaces with pre-reserved shear joints according to claim 5, characterized in that, The side template (22) has a protruding insert (24) on the inner wall of the groove (224) facing away from the end template (23), and the slot (111) on the clamping edge (11) is used for the insertion of the insert (24) to fit.

7. A sample preparation device for pre-reserved shear joints on simulated rock mass structural surfaces according to any one of claims 4-6, characterized in that, It also includes a tightening component (3), and the tightening component (3) is provided on each side of the side template (22) away from the casting chamber; the end template (23) is fixedly connected to each side of the end template (23), and the two connecting seats (231) extend to the side of the two side templates (22) away from each other, and the tightening component (3) is connected between the connecting seats (231) on the two end templates (23); The tightening component (3) includes: A screw (31), with each end of the screw (31) passing through a connecting seat (231); Gaskets (32), each end of the screw (31) is fitted with a corresponding gasket (32), the gaskets (32) being located on the side of the two end templates (23) that are far apart from each other; and Nut (33), the screw (31) has corresponding threaded connections at both ends, and the washer (32) is sandwiched between the nut (33) and the connecting seat (231).

8. The device for preparing samples with pre-reserved shear joints on simulated rock mass structural surfaces according to claim 7, characterized in that, It also includes an upper pressure plate (4), which is perpendicular to the first direction. Each of the single-sided chambers (25) is provided with an upper pressure plate (4), which is used to seal the top of the single-sided chamber (25).

9. A sample preparation device for pre-reserved shear joints on simulated rock mass structural surfaces according to claim 8, characterized in that, The upper pressure plate (4) has a first side wall (41) near the side wall of the simulated structure panel (1). A groove (42) is provided at the edge formed by the first side wall (41) and the lower plate surface of the upper pressure plate (4). A flexible insert (5) is embedded in the groove (42). The flexible insert (5) extends to the outside of the side of the first side wall (41) near the simulated structure panel (1).

10. A sample preparation device for pre-reserved shear joints on simulated rock mass structural surfaces according to claim 9, characterized in that, A handle (43) is fixedly connected to the upper surface of the upper pressure plate (4).

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