Rapid processing method for low-disturbance steep dip structural plane test body

Abstract

The invention discloses a rapid processing method for a low-disturbance steep dip structural plane test body, and belongs to the technical field of rock and soil tests. The method comprises the following steps: step 100, finishing an upper disc rock mass on a target structural plane; step 200, scribing is carried out; step 300, removing a lower side rock mass and installing a lower end constraint piece; 400, left and right rock masses are removed, and left and right restraining pieces are installed; step 500, removing the rock mass on the upper side; and step 600, cutting the constraint piece. In the process of removing rock masses on the lower side, the left side, the right side and the upper side of the steep dip structural plane test body, new constraint is formed on the structural plane test body in time through the test body constraint piece, disturbance to the structural plane test body in the machining process can be remarkably reduced, and the accuracy and effectiveness of structural plane strength test parameters are ensured; therefore, the engineering test parameters can reflect actual working conditions, and support is provided for subsequent engineering design and rock mass mechanics theory exploration based on the test parameters.

Description

TECHNICAL FIELD

[0001] The application relates to a low-disturbance steep structural plane test body rapid processing method and belongs to the technical field of rock-soil tests. BACKGROUND

[0002] A structural plane is a geological interface with certain forms and characteristics formed by various geological actions in a rock mass, and is an important component of the rock mass and has a significant influence on the physical and mechanical properties of the rock mass. The existence of the structural plane has a wide and far-reaching influence on underground engineering and can damage the integrity, stability and impermeability of the rock mass. If the structural plane parameters cannot reflect the actual conditions, the engineering stability is prone to be lost or the engineering investment is prone to be expanded, and therefore, the process control of the structural plane parameters is particularly important.

[0003] At present, the structural plane in-situ direct shear test is one of the most important means for obtaining the structural plane strength parameters reflecting the actual conditions. According to the relevant researches and regulations related to the structural plane test at home and abroad, such as the “Standard for Engineering Rock Mass Test Method” (GB / T 50266-2013), the “Hydropower Engineering Rock Mass Test Regulations” (DL / T 5368-2024), “The ISRM Suggested Methods for Rock Characterization, Testing and Monitoring: 2007-2014” and other relevant specifications or articles, the structural plane strength direct shear test is involved. However, only some specifications or articles mention that the test body processing of the structural plane needs to pay attention to the disturbance of the test body, but these specifications or articles do not provide specific solutions to reduce the disturbance of the test body processing.

[0004] The traditional structural plane test body processing method borrows from the rock mass direct shear test body processing method, and the technology is relatively rough. When the structural plane is nearly horizontal or gently inclined, the disturbance of the processing result is still within a controllable range, but when the structural plane is steep, the previous processing method no longer meets the requirements, and a new processing method needs to be sought.

[0005] At present, the power stations in the lower reaches of the Yarlung Zangbo River have been started, and the power station engineering site in the lower reaches of the Yarlung Zangbo River is located in the Himalayas formed by the collision and uplift of the Indian Ocean plate and the Eurasian plate. There are a large number of steep structural planes in the region. If the structural plane test body processing is disturbed greatly, the test result will be distorted, the final structural plane strength parameters cannot effectively reflect the actual conditions, and the scientificity and rationality of the subsequent engineering design will be affected. If a large number of structural plane test body processing processes are disturbed greatly, the rock mass mechanical theory system formed based on the test parameters will also be affected. Therefore, how to reduce the disturbance of the structural plane test body in the processing process is extremely important. SUMMARY

[0006] To solve the above technical problems, the application provides a low-disturbance steep structural surface test body processing method, which ensures the rapid flow of the structural surface test body processing process, reduces the disturbance of the processing process to the steep structural surface test body, supports the accuracy and effectiveness of the structural surface strength test parameters, and ensures that the engineering test parameters can reflect the actual situation, thereby providing guarantee for the scientificity and rationality of subsequent engineering design.

[0007] The application is implemented by the following technical solutions: The low-disturbance steep structural surface test body processing method comprises the following steps: Step 100, target structural surface upper rock mass trimming: the target structural surface upper rock mass is trimmed to a required thickness to obtain a test body reserved rock mass; Step 200, line marking: line marking is performed on the slope surface of the test body reserved rock mass to mark the positions of a plurality of structural surface test bodies, a rock mass preliminary cutting area, and a rock mass support body, the rock mass preliminary cutting area is located on the lower side of all the structural surface test bodies and is connected with all the structural surface test bodies, and the rock mass support body is located in the rock mass preliminary cutting area and is connected with one of the structural surface test bodies; Step 300, lower side rock mass removal and lower end restraint installation: the rock mass located on the upper side of the target structural surface in the rock mass preliminary cutting area is removed along the normal direction of the slope surface of the test body reserved rock mass, and a test body restraint is installed on the lower disc of the target structural surface to form a restraint on the lower end of all the structural surface test bodies along the slope, respectively; Step 400, left and right side rock mass removal and left and right side restraint installation: the rock mass located on the upper side of the target structural surface on the left side and the right side of each structural surface test body is removed along the normal direction of the slope surface of the test body reserved rock mass, and a test body restraint is installed on the lower disc of the target structural surface to form a restraint on the left side and the right side of each structural surface test body, respectively; Step 500, upper side rock mass removal: the rock mass on the upper side of each structural surface test body is removed along the normal direction of the slope surface of the test body reserved rock mass, so that each structural surface test body is separated from the rock mass; Step 600, restraint cutting: a template is installed to pour concrete on the slope surface of each structural surface test body, and after the concrete is cured, all the test body restraints around the structural surface test body are cut along the target structural surface before the structural surface test body is tested.

[0008] The thickness of the rock mass on the upper side of the target structural surface after trimming in the step 100 is 30 cm±2 cm.

[0009] The step 200 specifically comprises the following steps: Step 201, the size and quantity of the structural surface test body and the spacing between the structural surface test bodies are determined; Step 202, line marking is performed on the slope surface of the test body reserved rock mass to mark the positions of all the structural surface test bodies, and the lower edges of all the structural surface test bodies are collinear; Step 203, marking the position of the preliminary cutting area of the rock mass on the slope surface of the rock mass to be tested, and making the upper edge line of the preliminary cutting area of the rock mass to be tested collinear with the lower edge line of the structural plane to be tested; Step 204, marking the position of the original rock support in the preliminary cutting area of the rock mass, making the upper edge line of the original rock support collinear with the lower edge line of the structural plane to be tested, and making the original rock support collinear with the middle structural plane to be tested.

[0010] The number of the structural plane to be tested is odd.

[0011] The step 300 specifically comprises the following steps: Step 301, removing the rock mass on the upper side of the target structural plane in the preliminary cutting area of the rock mass along the normal direction of the slope surface of the rock mass to be tested; Step 302, installing the test body restraint on the lower disc of the target structural plane on the side of the preliminary cutting area of the rock mass to form a restraint on the middle position of the lower end of the structural plane to be tested corresponding to all the structural planes to be tested except the structural plane to be tested opposite to the original rock support; Step 303, removing the rock mass on the upper side of the target structural plane at the original rock support along the normal direction of the slope surface of the rock mass to be tested; Step 304, installing the test body restraint on the lower disc of the target structural plane to form a restraint on the middle position of the lower end of the structural plane to be tested opposite to the original rock support.

[0012] The rock mass is removed layer by layer by artificial cutting machine, electric grab, steel wedge and sledgehammer in the steps 100, 300, 400 and 500.

[0013] The test body restraint for forming a restraint on the left side or the right side of the structural plane to be tested is arranged close to the upper edge line of the structural plane to be tested in the step 400.

[0014] The test body restraint is a steel bar arranged along the normal direction of the target structural plane, one end of which is inserted into the lower disc of the target structural plane, and the other end of which extends above the target structural plane to form a restraint on the structural plane to be tested.

[0015] The length of the test body restraint in the lower disc of the target structural plane is not less than 20 cm, and the length of the test body restraint on the upper side of the target structural plane is not less than 1 / 3 of the thickness of the structural plane to be tested.

[0016] All the test body restraints around the structural plane to be tested are cut off by an angle grinder at the pre-cutting surface of the target structural plane in the step 600.

[0017] The beneficial effects of the present application are as follows: 1. In the process of removing the rock mass under, left, right and upper side of the steep structural plane test body, and timely forming new constraints on the structural plane test body through the test body constraint, the disturbance to the structural plane test body during the processing process can be significantly reduced, ensuring the accuracy and effectiveness of the structural plane strength test parameters, and further ensuring that the engineering test parameters can reflect the actual working conditions, providing support for subsequent engineering design and rock mechanics theory exploration based on test parameters.

[0018] 2. First, the original rock support forms a support on the upper side of the preliminary cut-off area of the rock mass, then the constraint is formed on the middle position of the lower end of the slope of all structural plane test bodies except the structural plane test body opposite to the original rock support through the test body constraint, and then the rock mass on the upper side of the target structural plane at the original rock support is removed, and finally the constraint is formed on the lower end of the slope of the structural plane test body opposite to the original rock support through the test body constraint, ensuring the continuity and reliability of the constraint on the lower end of the slope of the upper side of the rock mass in the preliminary cut-off area of the rock mass during the removal of the rock mass inside the preliminary cut-off area, and greatly reducing the disturbance to the upper side of the rock mass during the removal of the rock mass inside the preliminary cut-off area.

[0019] 3. Artificially using cutting machines, electric hoppers, steel wedges and hammers to break the rock mass layer by layer can ensure the processing speed of the structural plane test body while reducing the disturbance to the structural plane test body. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The relative position relationship diagram of the tunnel axis, the upper disc of the target structural plane, the lower disc of the target structural plane and the target structural plane of the application; Figure 2 The right view of the test body reserved rock mass when step 100 of the application is completed; Figure 3 The structural schematic diagram when step 200 of the application is completed; Figure 4 The structural schematic diagram when step 301 of the application is completed; Figure 5 The structural schematic diagram when step 302 of the application is completed; Figure 6 The structural schematic diagram when step 303 of the application is completed; Figure 7 The structural schematic diagram when step 304 of the application is completed; Figure 8 The structural schematic diagram when step 400 of the application is completed; Figure 9 The structural schematic diagram when step 500 of the application is completed.

[0021] In the figure: 1-tunnel axis, 2-upper plate of target structure, 3-lower plate of target structure, 4-target structure, 5-rock mass reserved for test specimen, 6-test specimen restraint, 7-test specimen, 9-preliminary rock mass removal area, 10-original rock support. Detailed Implementation

[0022] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0023] Example 1: like Figures 1 to 9 As shown, the present invention provides a method for processing a low-disturbance steeply tilted structural interview body, comprising the following steps: Step 100: Rock mass trimming of hanging wall 2 on the target structure surface: Trim the rock mass of hanging wall 2 on the target structure surface to the required thickness to obtain the reserved rock mass 5 for the specimen, such as... Figure 2 As shown. The target structural surface hanging wall 2, after being delivered by the construction unit, is theoretically required to retain only the required thickness of rock mass. However, in actual operation, it is difficult to control the rock mass thickness of the target structural surface hanging wall 2 to be exactly the required thickness. Therefore, the rock mass thickness of the target structural surface hanging wall 2 is generally greater than the required thickness. So, it is necessary to first trim the rock mass of the target structural surface hanging wall 2 to the required thickness.

[0024] Step 200: Marking lines: Mark the positions of multiple structural test specimens 7, the preliminary rock removal area 9, and the original rock support 10 on the slope surface of the reserved rock mass 5. The preliminary rock removal area 9 is located below all structural test specimens 7 and connects with all structural test specimens 7. The original rock support 10 is located within the preliminary rock removal area 9 and connects with one of the structural test specimens 7. Figure 3 As shown.

[0025] Step 300: Removal of lower rock mass and installation of lower end restraint: Remove the rock mass located on the upper side of the target structural surface 4 within the preliminary rock mass removal area 9 along the slope normal of the reserved rock mass 5 of the test specimen, and install the test specimen restraint 6 on the lower plate 3 of the target structural surface to form a restraint on the lower end of all structural test specimens 7 along the slope.

[0026] Step 400: Removal of left and right side rock mass and installation of left and right side constraint members: Remove the rock mass on the left and right sides of each structural test specimen 7 located on the upper side of the target structural surface 4 along the slope normal of the reserved rock mass 5 of the specimen, and install the specimen constraint members 6 on the lower plate 3 of the target structural surface to form constraints on the left and right sides of each structural test specimen 7, such as... Figure 8 As shown.

[0027] Step 500: Upper Rock Mass Removal: Remove the rock mass on the upper side of each structural test specimen 7 along the slope normal of the reserved rock mass 5, so that each structural test specimen 7 is separated from the original rock, such as... Figure 9As shown in Figure 8 And Figure 9 As shown in the accompanying drawings, the rock mass on the upper side of each structural plane test body 7 is removed after the left and right sides of each structural plane test body 7 are constrained by the test body constraint 6, which can reduce the disturbance caused by the removal of the rock mass to the structural plane test body 7.

[0028] Step 600, constraint cutting: install the template on the slope surface of each structural plane test body 7 to pour concrete, and after the concrete is cured, cut all the test body constraints 6 around the structural plane test body 7 along the target structural plane 4 before the test on the structural plane test body 7. Pouring concrete on the slope surface of the structural plane test body 7 facilitates the use of the upper surface of the structural plane test body 7 as the reference surface during the in-situ direct shear test of the structural plane.

[0029] During the removal of the rock mass on the lower, left, right, and upper sides of the steep structural plane test body 7, timely new constraints on the structural plane test body 7 are formed by the test body constraint 6, which can significantly reduce the disturbance to the structural plane test body 7 during processing, ensuring the accuracy and effectiveness of the structural plane strength test parameters, and further ensuring that the engineering test parameters can reflect the actual situation, providing a guarantee for the subsequent formation of the rock mass mechanics theory system based on the test parameters.

[0030] The rock mass thickness of the target structural plane upper disc 2 after modification in step 100 is 30 cm ± 2 cm. During construction, if the rock mass of the target structural plane upper disc 2 is too thick, a hole is first drilled using an electric grab, a steel wedge is then inserted into the hole, and the thicker part of the rock is broken by repeatedly hitting the steel wedge with a hammer. The method of manually modifying the rock mass of the target structural plane upper disc 2 reduces the disturbance to the structural plane test body 7 during the modification process while ensuring the processing speed of the structural plane test body 7.

[0031] The step 200 specifically includes the following steps: Step 201, determine the size and number of the structural plane test body 7, and the spacing between the structural plane test bodies 7; Step 202, mark the positions of all structural plane test bodies 7 on the slope surface of the test body reserved rock mass 5, and the lower edges of all structural plane test bodies 7 are collinear; Step 203, mark the position of the rock mass preliminary removal area 9 on the slope surface of the test body reserved rock mass 5, and make the upper edge of the rock mass preliminary removal area 9 collinear with the lower edge of the structural plane test body 7; Step 204, mark the position of the original rock support body 10 within the rock mass preliminary removal area 9, make the upper edge of the original rock support body 10 collinear with the lower edge of the structural plane test body 7, the lower edge collinear with the lower edge of the rock mass preliminary removal area 9, and make the original rock support body 10 aligned with the middle structural plane test body 7 among all structural plane test bodies 7, as shown in Figure 3 .

[0032] The number of the structural plane test bodies 7 is odd.

[0033] The step 300 specifically comprises the following steps: Step 301, along the normal of the slope surface of the test body reserved rock mass 5, remove the rock mass in the rock mass preliminary cutting area 9 except the original rock support body 10 and located on the upside of the target structural plane 4, as shown in the figure. Figure 4 When the size of the structural plane test body 7 is 50cm×50cm×30cm, the original rock with a width of 20cm is reserved in the middle of the rock mass preliminary cutting area 9 to form the original rock support body 10, so as to continue to support the rock mass on the upside of the rock mass preliminary cutting area 9 through the original rock support body 10, so as to reduce the disturbance to the structural plane test body 7 caused by the removal process of the rock mass in the rock mass preliminary cutting area 9.

[0034] Specifically, the rock mass in the rock mass preliminary cutting area 9 is cut by artificial rock cutting machine, and the single-layer rock mass breaking thickness is limited by the maximum cutting thickness of the cutting machine, and the rock mass is broken in layers by combining with tools such as electric hoist, steel wedge and sledge hammer.

[0035] Step 302, install the test body constraint 6 on the target structural plane lower plate 3 inside the rock mass preliminary cutting area 9, and form constraints on the middle positions of the lower end of all the structural plane test bodies 7 except the structural plane test body 7 opposite to the original rock support body 10, as shown in the figure. Figure 5

[0036] Step 303, along the normal of the slope surface of the test body reserved rock mass 5, remove the rock mass at the original rock support body 10 and located on the upside of the target structural plane 4, as shown in the figure. Figure 6

[0037] Step 304, install the test body constraint 6 on the target structural plane lower plate 3, and form constraints on the middle positions of the lower end of the structural plane test body 7 opposite to the original rock support body 10, as shown in the figure. Figure 7

[0038] The original rock support body 10 supports the rock mass on the upside of the rock mass preliminary cutting area 9, then the constraints are formed on the middle positions of the lower end of all the structural plane test bodies 7 except the structural plane test body 7 opposite to the original rock support body 10 through the test body constraint 6, then the rock mass at the original rock support body 10 and located on the upside of the target structural plane 4 is removed, and finally the constraints are formed on the lower end of the structural plane test body 7 opposite to the original rock support body 10 through the test body constraint 6, which ensures the continuity and reliability of the constraints on the lower end of the rock mass on the upside of the rock mass preliminary cutting area 9 in the process of removing the rock mass inside the rock mass preliminary cutting area 9, and greatly reduces the disturbance to the rock mass on the upside of the rock mass preliminary cutting area 9 caused by the removal process of the rock mass inside the rock mass preliminary cutting area 9. ​​​

[0039] The step 100, step 300, step 400 and step 500 are broken by artificial layer by layer with cutting machine, electric grab, steel wedge and hammer. Artificially using cutting machine, electric grab, steel wedge and hammer and other tools to break the rock mass layer by layer, while ensuring the processing speed of the structural plane test body 7, the disturbance to the structural plane test body 7 is reduced.

[0040] The test body constraint 6 for forming constraint on the left side or the right side of the structural plane test body 7 in the step 400 is arranged close to the upper edge line of the structural plane test body 7. It is helpful to further reduce the disturbance caused by the upper rock mass removal process of the structural plane test body 7 to the structural plane test body 7.

[0041] The test body constraint 6 is a steel bar arranged along the normal direction of the target structural plane 4, one end of which is inserted into the target structural plane lower disc 3, and the other end extends above the target structural plane 4 to form a constraint on the structural plane test body 7. During construction, a 20cm hole is drilled on the target structural plane lower disc 3 along the normal direction of the target structural plane 4 using an electric grab, and then a 30cm long and 6mm diameter HRB400 steel bar is knocked into the hole, and the remaining 10cm is used to constrain the structural plane test body 7 on the upper side of the target structural plane 4.

[0042] The structural plane test body 7 is constrained by the steel bar instead of the original rock, so that the disturbance to the structural plane test body 7 caused by the release of the original rock constraint can be minimized during the release of the original rock constraint around the structural plane test body 7.

[0043] The length of the test body constraint 6 in the target structural plane lower disc 3 is not less than 20cm, and the length on the upper side of the target structural plane 4 is not less than 1 / 3 of the thickness of the structural plane test body 7.

[0044] In the step 600, an angle grinder is used to cut off all test body constraints 6 around the structural plane test body 7 at the pre-shear surface of the target structural plane 4.

[0045] Example two: There are a large number of steep structural planes in the construction site of a key project in Tibet that need to be tested by structural plane in-situ direct shear test. The low disturbance steep structural plane test body processing method under this working condition is as follows.

[0046] Step 100, target structural plane upper disc 2 rock mass trimming: The upper disc 2 of the target structural plane after blasting and hydraulic fracturing modification has a thickness of 30-50 cm, and the rock mass with a thickness exceeding 30 cm needs to be modified by using an electric grab, a steel wedge and a hammer, so that the thickness of the upper disc 2 of the target structural plane is 30 cm, to obtain the test body reserved rock mass 5. Specifically, holes are first punched at a distance of 30 cm and 40 cm from the target structural plane 4 by using an electric grab, then a steel wedge is inserted into the hole, and the rock is broken layer by layer by repeatedly hitting the steel wedge with a hammer, so that the overall thickness of the test body reserved rock mass 5 obtained by modification is controlled within the range of 30 cm±2 cm.

[0047] Step 200, scribing: Scribing is performed on the slope surface of the test body reserved rock mass 5 to mark the positions of the plurality of structural plane test bodies 7, the rock mass preliminary cutting area 9 and the original rock support body 10. The rock mass preliminary cutting area 9 is located below all the structural plane test bodies 7 and is connected with all the structural plane test bodies 7. The original rock support body 10 is located in the rock mass preliminary cutting area 9 and is connected with one of the structural plane test bodies 7.

[0048] The step 200 specifically includes the following steps: Step 201, determining the size and number of the structural plane test bodies 7 and the spacing between the structural plane test bodies 7; Step 202, scribing is performed on the slope surface of the test body reserved rock mass 5 to mark the positions of all the structural plane test bodies 7, and the lower edges of all the structural plane test bodies 7 are collinear; Step 203, scribing is performed on the slope surface of the test body reserved rock mass 5 to mark the position of the rock mass preliminary cutting area 9, and the upper edge of the rock mass preliminary cutting area 9 is collinear with the lower edge of the structural plane test body 7; Step 204, scribing is performed in the rock mass preliminary cutting area 9 to mark the position of the original rock support body 10, so that the upper edge of the original rock support body 10 is collinear with the lower edge of the structural plane test body 7, the lower edge is collinear with the lower edge of the rock mass preliminary cutting area 9, and the original rock support body 10 is aligned with the middle structural plane test body 7 among all the structural plane test bodies 7.

[0049] Step 300, lower rock removal and lower end restraint installation: Rock cutting is performed along the lower section of the test body reserved rock mass 5 by using a rock cutting machine, and the rock is removed layer by layer by using an electric grab, a steel wedge and a hammer, until the lower section of the test body reserved rock mass 5 is removed to the target structural plane 4, and the original rock with a width of 20 cm in the middle of the whole row of test bodies is reserved as the original rock support body 10.

[0050] The electric grab is used to punch a hole with a diameter of 6 mm and a depth of 20 cm in the middle position of the cross section of each structural plane test body 7 along the normal direction of the target structural plane 4, and then a steel bar is knocked into the air as a support structure for preventing the structural plane test body 7 from sliding downward. The steel bar is HRB400 with a length of 30 cm and a diameter of 6 mm, and the length of the steel bar punched into the hole is 20 cm, and the remaining 10 cm is outside to prevent the structural plane test body 7 from being disturbed during processing. Next, the remaining original rock support body 10 is cut off, and then a steel bar is knocked in to replace the original rock support body 10, and the structural plane test body 7 in the middle position is formed to constrain the lower end surface of the slope.

[0051] Step 400, left and right side rock mass removal and left and right side constraint installation: The rock mass on the left and right sides of each structural plane test body 7 is cut off, the remaining original rock support body 10 is cut off, and then a steel bar is knocked in to replace the original rock support body 10, the size of the structural plane test body 7 in the middle position is 50 cm x 50 cm, the remaining original rock support body 10 is cut off, and then a steel bar is knocked in to replace the original rock support body 10, and the structural plane test body 7 in the middle position is spaced 50 cm apart. The upper part of the reserved structural plane test body 7 is not cut off, which is reserved to reduce the disturbance of the structural plane test body 7.

[0052] Then, a hole with a depth of 20 cm is punched on the left and right sides of the structural plane test body 7 cut off by the rock mass at a distance of 35 cm from the cutting surface to the bottom surface, and a steel bar is punched into the air as a support structure for reducing the disturbance of the upper rock mass cutting and crushing.

[0053] Step 500, upper side rock mass removal: After the structural plane test body 7 is constrained by the steel bar, the upper rock mass connected to the original rock is cut off. After this part is cut off, the structural plane test body 7 is processed.

[0054] Step 600, constraint cutting: templates are installed on the slope surface of each structural plane test body 7 to pour concrete, and after the concrete is cured, all test body constraints 6 around the structural plane test body 7 are cut off along the target structural plane 4 before the structural plane test body 7 is tested.

Claims

1. A method for low-disturbance, steep-dipping structural plane testing, characterized by: The method comprises the following steps: Step 100, rock mass trimming on the upper disc of the target structure surface (2): trimming the rock mass on the upper disc of the target structure surface (2) to a required thickness to obtain a test body reserved rock mass (5); Step 200, marking: marking the positions of a plurality of structure test bodies (7), a rock mass preliminary cutting area (9) and a protolith support body (10) on the slope surface of the test body reserved rock mass (5), the rock mass preliminary cutting area (9) being located below all the structure test bodies (7) and being connected with all the structure test bodies (7), and the protolith support body (10) being located in the rock mass preliminary cutting area (9) and being connected with one of the structure test bodies (7); Step 300, lower side rock mass removal and lower end restraint installation: removing the rock mass above the target structure surface (4) in the rock mass preliminary cutting area (9) along the normal direction of the slope surface of the test body reserved rock mass (5), and installing test body restraints (6) on the lower disc of the target structure surface (3) to form restraints on the lower ends of all the structure test bodies (7) respectively; Step 400, left and right side rock mass removal and left and right side restraint installation: removing the rock mass above the target structure surface (4) on the left and right sides of each structure test body (7) along the normal direction of the slope surface of the test body reserved rock mass (5), and installing test body restraints (6) on the lower disc of the target structure surface (3) to form restraints on the left and right sides of each structure test body (7) respectively; Step 500, upper side rock mass removal: removing the rock mass above each structure test body (7) along the normal direction of the slope surface of the test body reserved rock mass (5) to separate each structure test body (7) from the protolith; Step 600, restraint cutting: installing a template to cast concrete on the slope surface of each structure test body (7), and after the concrete is cured, cutting all the test body restraints (6) around the structure test body (7) along the target structure surface (4) before testing the structure test body (7).

2. The low-disturbance steep-dip-structure-sample-processing method according to claim 1, characterized in that: The thickness of the rock mass on the upper disc of the target structure surface (2) after trimming in the step 100 is 30 cm ± 2 cm.

3. The low-disturbance steep-dip-structure-sample-processing method of claim 1, wherein: The step 200 specifically comprises the following steps: Step 201, determining the size and quantity of the structure test bodies (7) and the spacing between the structure test bodies (7); Step 202, marking the positions of all the structure test bodies (7) on the slope surface of the test body reserved rock mass (5), and the lower edges of all the structure test bodies (7) being collinear; Step 203, marking the position of the rock mass preliminary cutting area (9) on the slope surface of the test body reserved rock mass (5), and making the upper edge of the rock mass preliminary cutting area (9) collinear with the lower edge of the structure test body (7); Step 204, marking the position of the protolith support body (10) in the rock mass preliminary cutting area (9), making the upper edge of the protolith support body (10) collinear with the lower edge of the structure test body (7), the lower edge collinear with the lower edge of the rock mass preliminary cutting area (9), and making the protolith support body (10) aligned with the middle structure test body (7) among all the structure test bodies (7).

4. The low-disturbance steep-dip structural plane test body processing method according to claim 1 or 3, characterized by: The quantity of the structure test bodies (7) is an odd number.

5. The low-disturbance steep-dip-structure-sample-processing method of claim 1, wherein: The step 300 specifically comprises the following steps: Step 301, removing the rock mass on the normal direction of the slope surface of the test body reserved rock mass (5) in the preliminary cutting area (9) except the original rock support (10) and on the upside of the target structural plane (4); Step 302, installing the test body constraint (6) on the target structural plane lower plate (3) in the preliminary cutting area (9) to form a constraint on the middle position of the lower end of all the structural plane test bodies (7) except the structural plane test body (7) opposite to the original rock support (10); Step 303, removing the rock mass on the normal direction of the slope surface of the test body reserved rock mass (5) at the original rock support (10) and on the upside of the target structural plane (4); Step 304, installing the test body constraint (6) on the target structural plane lower plate (3) to form a constraint on the middle position of the lower end of the structural plane test body (7) opposite to the original rock support (10).

6. The low-disturbance steep-dip-structure-sample-processing method of claim 1, wherein: In the steps 100, 300, 400 and 500, the rock mass is removed layer by layer by artificial cutting machine, electric grab, steel wedge and sledgehammer.

7. The low-disturbance steep-dip-structure-sample-processing method of claim 1, wherein: In the step 400, the test body constraint (6) for forming a constraint on the left side or the right side of the structural plane test body (7) is arranged close to the upper edge line of the structural plane test body (7).

8. The low-disturbance steep-dip-structure-sample-processing method of claim 1, wherein: The test body constraint (6) is a steel bar arranged along the normal direction of the target structural plane (4), one end of which is inserted into the target structural plane lower plate (3) and the other end of which extends above the target structural plane (4) to form a constraint on the structural plane test body (7).

9. The low-disturbance steep-dip-structure sample processing method according to claim 8, characterized by: The length of the test body constraint (6) in the target structural plane lower plate (3) is not less than 20 cm and the length on the upside of the target structural plane (4) is not less than 1 / 3 of the thickness of the structural plane test body (7).

10. The low-disturbance steep-dip-structure-sample-processing method of claim 1, wherein: In the step 600, all the test body constraints (6) around the structural plane test body (7) are cut off at the pre-cutting surface of the target structural plane (4) by an angle grinder.

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