Rock mass friction angle tester and test method

Abstract

The invention discloses a rock mass friction angle tester and a test method, the rock mass friction angle tester comprises a bottom plate and a test module, the upper side of the bottom plate is fixedly provided with two mounting seats, the test module is rotatably connected to the two mounting seats through a rotating shaft structure, the center of gravity of the test module is located right below the rotation axis of the rotating shaft structure, and the center of gravity of the test module is located right below the rotation axis of the rotating shaft structure. The test module is located on the upper side of the bottom plate and can keep balance through gravity; the test module comprises a supporting plate, two supporting blocks, a detection seat, a fixing block, a cover body, a first force sensor and a second force sensor, the supporting plate is located on the upper side of the bottom plate, and a gap for deflection of the test module is formed between the supporting plate and the bottom plate; the two supporting blocks are fixedly mounted on the upper portion of the supporting plate and rotationally connected with the two mounting bases through rotating shaft structures correspondingly, and the rotating shaft structures can be locked. The device can conveniently and accurately simulate a rock mass friction angle test.

Description

Technical Field

[0001] The invention relates to the technical field of rock testing equipment, and more specifically, to a rock friction angle testing instrument and a rock friction angle testing method. Background Art

[0002] The rock surface friction angle refers to the angle determined by the relationship between the friction force on the rock surface and the pressure perpendicular to the surface. This angle describes the shear resistance of the rock surface when subjected to external forces. It is defined as follows: when a force large enough to cause the rock surface to begin to slide relative to each other, the ratio of the required force to the pressure perpendicular to the surface, that is, the ratio of shear stress to normal stress, is the structural surface friction angle.

[0003] The friction angle of rock surface plays an important role in geology and rock mechanics. First, it is one of the key parameters for evaluating rock stability. For rock engineering and geological disaster prevention, understanding the size of the friction angle of the structural surface can help engineers and geologists evaluate the stability of the rock mass and predict possible geological disasters such as rock landslides and karst collapse. Secondly, the friction angle of the structural surface also affects the mechanical properties of the rock. In the mechanical model of rock, the friction angle of the structural surface is an important parameter that affects the strength, deformation and fracture behavior of the rock. In rock mechanics tests and simulations, accurate measurement and understanding of the friction angle of the structural surface is crucial to establishing a reliable rock mechanics model. Therefore, understanding the definition and role of the friction angle of the rock surface is of great significance for rock engineering, geological exploration and geological disaster prevention.

[0004] In engineering practice, two suitable rocks need to be found before the test can be carried out. The first rock block (i.e., the second rock block in this embodiment) has fewer requirements, and only needs to have an appropriate surface that can serve as a friction surface, while the second rock block (i.e., the first rock block in this embodiment) needs to match the first rock block, which has relatively higher requirements. The second rock block is likely to be a large rock mass itself. In traditional tests, the second rock block itself needs to be removed from the large rock mass. In practice, it is particularly difficult to cut it off for testing.

[0005] Therefore, a new solution needs to be proposed to solve this problem. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a rock friction angle tester capable of testing the friction angle of a rock mass.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A rock friction angle tester comprises a base plate and a test module, wherein two mounting seats are fixedly mounted on the upper side of the base plate, the test module is rotatably connected to the two mounting seats via a rotating shaft structure, the center of gravity of the test module is located directly below the rotation axis of the rotating shaft structure, the test module is located on the upper side of the base plate, and can maintain balance through gravity; the test module comprises a support plate, two support blocks, a detection seat, a fixed block, a cover body, a force sensor 1 and a force sensor 2, the support plate is located on the upper side of the base plate, and a gap is formed between the support plate and the base plate for the test module to swing; the two support blocks are fixedly mounted on the upper part of the support plate, the two support blocks are rotatably connected to the two mounting seats via a rotating shaft structure respectively, and the rotating shaft structure can be locked;

[0009] The detection seat is located above the support plate, the force sensor 1 is installed between the detection seat and a support block, and is used to detect the axial force of the rotating shaft structure, the fixed block is fixedly connected to the upper side of the detection seat, the cover body is at least partially located on the upper side of the detection seat, and the force sensor 2 is installed between the fixed block and the cover body, and is used to detect the force from top to bottom and perpendicular to the axial direction of the rotating shaft structure.

[0010] The present invention is further configured such that two groups of guide slide rods are fixedly installed between the two support blocks, the detection seat is slidably connected to the guide slide rods, and the length direction of the guide slide rods is parallel to the axial direction of the rotating shaft structure.

[0011] The present invention is further configured such that the force sensor 1 includes two detection ends 1, and the two detection ends 1 are respectively connected to a detection seat and a support block; the force sensor 2 is fixedly installed on the fixed block, and the force sensor 2 includes a detection end 2, and the detection end 2 is arranged upward and fixedly connected to the cover body.

[0012] The present invention is further configured such that a non-slip pad is fixedly mounted on the lower side of the bottom plate.

[0013] The present invention is further configured such that the rotating shaft structure includes a shaft body, the shaft body is fixedly connected to the support block, the mounting seat is provided with an shaft hole adapted to the shaft body, the shaft body is rotatably connected in the shaft hole, and the rotating shaft structure also includes a locking bolt, which is used to lock the rotating shaft structure.

[0014] The present invention is further configured such that an annular protrusion is fixedly connected to one end of the axial hole away from the support block, a threaded hole is provided on the end face of the axial body, the locking bolt passes through the annular protrusion and is threadedly connected to the threaded hole of the axial body, and the screw head of the locking bolt can abut against the end face of the annular protrusion to achieve friction locking.

[0015] The present invention is further configured such that extension blocks are fixedly connected on both sides of the support block, the extension blocks are threadedly connected with support bolts, the support bolts penetrate the extension blocks from top to bottom, and the lower ends of the support bolts are used to abut against the base plate. The four support bolts abut against the base plate to achieve limited fixation of the support plate and the base plate.

[0016] The present invention is further configured such that the fixed block is equipped with a plurality of guide sleeves, which are used to guide the cover body up and down, and the guiding direction is parallel to the force direction of the force sensor 2; the cover body is fixedly connected with a plurality of guide columns, which are matched one by one with the guide sleeves and inserted into the guide sleeves to realize sliding guidance.

[0017] The present invention also provides a rock friction angle test method, using the rock friction angle tester as described above to perform the test, selecting rock block 1 and rock block 2, rock block 1 having a test surface 1 and a pressure surface, the test surface 1 and the pressure surface are respectively located on both sides of rock block 1, rock block 2 having a test surface 2, the test surface 1 and the test surface 2 are adapted to each other;

[0018] The test surface 1 of the rock block 1 is pressed against the test surface 2 of the rock block 2, and the mounting base of the rock friction angle tester is placed on the pressure surface of the rock block 1. The rotating shaft structure is unlocked, and the test module can rotate around the rotating shaft structure. Under the action of the deadweight of the test module, the test module will be automatically leveled;

[0019] Pressure is applied to the test module from the cover downward. During the test, the direction of the applied pressure is first perpendicular to the upper side of the cover, and then the pressure is tilted and adjusted along the end direction of the rotating shaft structure until rock block 1 and rock block 2 produce relative slip; force sensor 1 and force sensor 2 respectively record the forces in the two directions, and the forces in the two directions are perpendicular to each other.

[0020] In summary, the present invention has the following beneficial effects:

[0021] By using a rock friction angle tester, pressure is applied to the test module. The pressure can be converted into forces in two vertical directions. The forces in the two directions are respectively obtained by two force sensors, so as to obtain the rock friction angle test data; by adjusting the inclination direction of the pressure applied to the test module, the pressure applied to the module will produce distribution changes during the adjustment process until the rock blocks of the two samples slip, so as to simulate the friction angle test data of the two sample rock blocks.

[0022] Through two sets of sliding guide structures, the relative movement of the internal components of the test module can be slidingly guided, so that the corresponding force sensor only generates force in the detected direction during detection, avoiding interference from forces in other directions and improving the stability of detection.

[0023] By automatically leveling the test module, the state of the test module itself can be balanced, and the upper side of the test module and the cover body at the stress position can always maintain stability when stressed. The pressure on the test module is only converted into forces in two directions, which makes it easier to analyze and transform the comprehensive forces. Moreover, since the test module can automatically level around the rotating shaft structure, it can avoid unnecessary distortion of the two force sensors when detecting forces, thereby improving the accuracy of force detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a stereogram of a rock friction angle tester in this embodiment;

[0025] Figure 2 This is a schematic diagram of the internal structure of a rock friction angle tester in this embodiment;

[0026] Figure 3 1 is a top view of a rock friction angle tester in this embodiment;

[0027] Figure 4 for Figure 3 Sectional view at AA;

[0028] Figure 5 for Figure 3 Sectional view at the middle BB;

[0029] Figure 6 Schematic diagram of a test state of a rock friction angle tester in this embodiment;

[0030] Figure 7 Schematic diagram of the leveling structure of a rock friction angle tester in this embodiment.

[0031] Figure markings: base plate 1; gap 101; test module 2; anti-slip pad 3; mounting seat 4; support plate 5; support block 6; extension block 601; shaft structure 7; shaft body 701; shaft hole 702; annular protrusion 703; locking bolt 704; screw head 705; threaded hole 706; detection seat 8; guide slide rod 9; force sensor one 10; detection end one 1001; fixing block 11; force sensor two 12; detection end two 1201; cover body 13; clearance gap 1301; clearance hole 1302; guide slide sleeve 14; support bolt 15; angle sensor 16; rock block one 17; test surface one 1701; pressure surface 1702; rock block two 18; test surface two 1801. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] This embodiment discloses a rock friction angle tester, referring to Figure 1 , Figure 3 As shown, it includes a base plate 1 and a test module 2. Two mounting seats 4 are fixedly installed on the upper side of the base plate 1. The test module 2 is rotatably connected to the two mounting seats 4 through a rotating shaft structure 7. The rotating shaft structure 7 is provided with two groups and is coaxial and located on both sides of the test module 2, so that the test module 2 can be rotated and adjusted around the rotating shaft structure 7.

[0034] The center of gravity of the test module 2 is located directly below the rotation axis of the rotating shaft structure 7. The test module 2 is located on the upper side of the bottom plate 1 and can maintain balance through gravity. Under the self-weight of the test module 2, a certain gap 101 can be maintained between the lower side of the test module 2 and the bottom plate 1, and the gap 101 can allow the test module 2 to rotate and adjust within a certain angle.

[0035] An anti-skid pad 3 is fixedly installed on the bottom plate 1, which can be pressed against the rock block to avoid slippage between the test instrument and the rock block. During the test, the test instrument and the rock block it directly presses can be regarded as keeping still, and the pressure applied by the tester to the test instrument can be roughly regarded as being directly applied to the rock block.

[0036] Reference Figure 2 , Figure 4 , Figure 5 As shown, the test module 2 includes a support plate 5, two support blocks 6, a detection seat 8, a fixing block 11, a cover 13, a force sensor 1 10 and a force sensor 2 12. The support plate 5 is located on the upper side of the base plate 1, and the support plate 5 is the lower side of the test module 2. A gap 101 is formed between the support plate 5 and the base plate 1 for the test module 2 to swing.

[0037] Two support blocks 6 are fixedly mounted on the upper part of the support plate 5, and the two support blocks 6 are rotatably connected to the two mounting seats 4 through the rotating shaft structure 7. In addition, the rotating shaft structure 7 is connected to a relatively upper position of the test module 2, and the weights on both sides of the test module 2 are basically equal, so that the test module 2 can maintain self-balancing with the rotating shaft structure 7. The rotating shaft structure 7 adopts a lockable structure, such as a screw structure, so that the test module 2 can be re-fixed after the adjustment is completed.

[0038] Reference Figure 4As shown, the rotating shaft structure 7 includes a shaft body 701, and the shaft body 701 is fixedly connected to the support block 6, and the two shaft bodies 701 form a protruding structure on both sides of the test module 2. The mounting seat 4 is provided with a shaft hole 702, and the position and size of the shaft hole 702 are mutually adapted to the shaft body 701, and the shaft body 701 can extend into the shaft hole 702 and can be rotatably connected in the shaft hole 702.

[0039] The rotating shaft structure 7 also includes a locking bolt 704, through which the rotating shaft structure 7 can be locked. After locking, the rotating shaft structure 7 will not be able to rotate, and the test module 2 will be stationary relative to the bottom plate 1. An annular protrusion 703 is fixedly connected to the end of the shaft hole 702 away from the support block 6, and a threaded hole 706 is provided on the end surface of the shaft body 701. The locking bolt 704 passes through the annular protrusion 703 and is threadedly connected to the threaded hole 706 of the shaft body 701. During the locking process, the screw head 705 of the locking bolt 704 can abut against the end surface of the annular protrusion 703, and the locking is achieved through the friction force between the two.

[0040] The detection seat 8 is located above the support plate 5, and the detection seat 8 and the support block 6 can slide against each other in the axial direction of the rotating shaft structure 7. The force sensor 10 is installed between the detection seat 8 and a support block 6, and can detect the axial force of the rotating shaft structure 7.

[0041] The fixing block 11 is fixedly connected to the upper side of the detection seat 8, and the fixing block 11 and the detection seat 8 are an integrated structure. The cover body 13 is generally a structure with a closed upper side and outer periphery, and an open lower part. When installed, the cover body 13 covers the upper side of the detection seat 8 and can cover most of the components of the test module 2, thereby protecting the sensors and other components in the test module 2. In order to adapt to the shape of the rotating shaft structure 7 and the extension block 601, the cover body 13 can be provided with a clearance notch 1301 and a clearance hole 1302.

[0042] The cover 13 is at least partially located on the upper side of the detection seat 8, and the force sensor 2 12 is installed between the fixed block 11 and the cover 13. The force sensor 2 12 can detect the force from top to bottom and perpendicular to the axial direction of the rotating shaft structure 7. The force sensor 1 10 and the force sensor 2 12 can detect the force in two directions perpendicular to each other, and the force applied to the rock mass can be analyzed through the two directions, and then the parameters of the force applied to the rock mass can be obtained.

[0043] Reference Figure 2 , Figure 5 As shown, two groups of guide slide bars 9 are fixedly installed between the two support blocks 6. The guide slide bars 9 are parallel to each other and are respectively installed on both sides of the rotating shaft structure 7, and the length direction of the guide slide bars 9 is parallel to the axial direction of the rotating shaft structure 7. The detection seat 8 is slidably connected to the guide slide bars 9 and can slide and guide along the guide slide bars 9 to maintain the relative position stability of the detection seat 8.

[0044] The force sensor 10 is an S-type force sensor, including two detection ends 1001, which are respectively connected to the detection seat 8 and a support block 6. The two detection ends 1001 are arranged along the axial direction of the guide slide 9, so as to detect the force in the axial direction.

[0045] The main body of the force sensor 12 is fixedly installed on the fixed block 11. The force sensor 12 includes a detection end 1201. The detection end 1201 is located in the main body of the force sensor 12. The detection end 1201 is set upward. The detection end 1201 can slide slightly up and down in the main body of the force sensor 12. The detection end 1201 is fixedly connected to the cover 13. When downward pressure is applied to the detection end 1201, the downward force can be obtained. In addition, the detection direction of the force sensor 12 is perpendicular to the detection direction of the force sensor 10, so that two mutually perpendicular forces can be obtained, which is convenient for reasonable analysis of the rock block.

[0046] Reference Figure 2 As shown, the fixed block 11 is installed with several guide sleeves 14, and the direction of the guide sleeves 14 is the force detection direction of the force sensor 2 12. The guide sleeves 14 can guide the cover 13 up and down, and the guiding direction is parallel to the force direction of the force sensor 2 12; a number of guide columns (not shown in the figure) are fixedly connected to the inner side of the cover 13, and the guide columns are matched with the guide sleeves 14 one by one, and inserted into the guide sleeves 14 to achieve sliding guidance. In addition, the upper side surfaces of the support plate 5 and the cover 13 are in a parallel state, thereby ensuring that more accurate force can be obtained during the force process.

[0047] In addition, an angle sensor 16 is also installed on the fixed block 11. The angle sensor 16 can detect the inclination angles at both ends of the axis of the rotating shaft structure 7. In another vertical direction, automatic leveling can be achieved through the self-balancing swing of the test module 2, and the inclination angle detected by the angle sensor 16 is the inclination angle at both ends of the axis of the rotating shaft structure 7.

[0048] During the test, the test module 2 is subjected to a certain amount of pressure. In order to maintain the structural stability of the test module 2 , on the basis of locking the rotating shaft structure 7 , auxiliary fixation is performed by support bolts 15 to prevent the test module 2 from loosening.

[0049] Reference Figure 2 , Figure 3 , Figure 5As shown, extension blocks 601 are fixedly connected on both sides of the support block 6, and the extension blocks 601 are integrally formed with the support block 6. Four extension blocks 601 form four support points at the four corners outside the test module 2. A threaded hole that passes through the extension block 601 is provided, and the extension block 601 is threadedly connected with a support bolt 15. The support bolt 15 passes through the extension block 601 from top to bottom, and the four support bolts 15 are abutted against the bottom plate 1, so that the support plate 5 and the bottom plate 1 are fixed in a limited position.

[0050] During the process of locking and fixing the test module 2, the test module 2 is first locked and fixed by the rotating shaft structure 7, and then the support bolt 15 is threadedly screwed so that the lower end of the support bolt 15 is abutted against the base plate 1. The lower end of the support bolt 15 is first pressed to form a support at the extension block 601, and then the support bolts 15 are gradually tightened to maintain the stability of the locked state of the test module 2 through four supporting points.

[0051] This embodiment also discloses a rock friction angle test method, referring to Figure 6 , Figure 7 As shown, the test is carried out using the rock friction angle tester in the above embodiment.

[0052] According to the test requirements, rock block 17 and rock block 2 18 are selected. Rock block 17 has a test surface 1701 and a pressure surface 1702. The test surface 1701 and the pressure surface 1702 are respectively located on both sides of rock block 17, and rock block 2 18 has a test surface 1801. The test surface 1701 and the test surface 1801 are adapted to each other.

[0053] Among them, the rock block 18 is used as a fixed foundation for the test, and its volume structure is usually large, and the test surface 1801 faces upward. In an ideal state, the test surface 1801 is selected to be as horizontal as possible. When selecting an actual test site, the test surface 1801 usually has a small inclination angle, such as Figure 6 The test surface 1701 and the pressure surface 1702 are located on the two sides of the rock block 17, respectively. Ideally, they should be kept horizontal. When selecting samples at an actual test site, the test surface 1701 and the pressure surface 1702 will also have a small inclination angle.

[0054] During the test, refer to Figure 6As shown, the test surface 1701 of the rock block 17 is pressed against the test surface 1801 of the rock block 2 18, and the mounting base 4 of the rock friction angle tester is placed on the pressure surface 1702 of the rock block 17. When placing, the axis direction of the rotating shaft structure 7 of the test module 2 is set up and down along the inclination direction of the test surface 1701 of the rock block 17. Then the test module 2 is leveled, first unlock the rotating shaft structure 7, the test module 2 can rotate around the rotating shaft structure 7, under the action of the self-weight of the test module 2, the test module 2 will automatically level, and then lock the rotating shaft structure 7, and then screw the support bolt 15, so that the lower end of the support bolt 15 is against the bottom plate 1, and the position of the test module 2 is locked and fixed.

[0055] When applying pressure, pressure is applied downward from the cover body 13 to the test module 2. During the test, the direction of the applied pressure is first perpendicular to the upper side of the cover body 13, and then tilted and adjusted along the end direction of the rotating shaft structure 7 until rock block 1 17 and rock block 2 18 produce relative slip.

[0056] The force sensor 10 and the force sensor 2 12 respectively record the forces in two directions, and the forces in the two directions are perpendicular to each other. According to the data recorded by the force sensor 10 and the force sensor 2 12, a rectangular coordinate system is formed, and according to the force conditions in the two directions, a force change curve can be drawn, and then the test data of the friction angle of the rock structure surface can be obtained. In addition, according to the inclination parameter of the angle sensor 16, the deadweight of the rock friction angle tester in this embodiment can be supplemented and analyzed, and the test data can be further analyzed to compensate for the above test data.

[0057] Reference Figure 1 , Figure 2 , Figure 6 , Figure 7 As shown, the axial direction of the rotating shaft structure 7 is defined as the x-axis, and the force sensor 10 can detect the force in the x-axis direction; the axial direction of the guide sleeve 14 in the test module 2 is defined as the z-axis, and the force sensor 2 12 can detect the force in the z-axis direction; the direction perpendicular to both the x-axis and the z-axis is defined as the y-axis, and there is no force sensor in the y-axis direction, and automatic leveling in the y-axis direction can be achieved by rotating around the rotating shaft structure 7.

[0058] By automatically leveling the test module 2, the state of the test module 2 itself can be balanced, and then the test module 2 and the upper side of the cover 13 at the force-bearing position can always maintain stability when subjected to force, and the pressure on the test module 2 is only converted into forces in two directions, thereby facilitating the analysis and conversion of the comprehensive forces. Moreover, since the test module 2 can be automatically leveled around the rotating shaft structure 7, it can avoid unnecessary distortion of the two force sensors when detecting the forces, thereby improving the accuracy of the force detection.

[0059] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A rock friction angle tester, characterized in that: The test module (2) comprises a base plate (1) and a test module (2), wherein two mounting seats (4) are fixedly mounted on the upper side of the base plate (1), and the test module (2) is rotatably connected to the two mounting seats (4) via a rotating shaft structure (7), the center of gravity of the test module (2) is located directly below the rotation axis of the rotating shaft structure (7), and the test module (2) is located on the upper side of the base plate (1) and can maintain balance through gravity; The test module (2) comprises a support plate (5), two support blocks (6), a detection seat (8), a fixed block (11), a cover (13), a force sensor 1 (10) and a force sensor 2 (12); the support plate (5) is located on the upper side of the base plate (1); a gap (101) is formed between the support plate (5) and the base plate (1) for the test module (2) to swing; the two support blocks (6) are fixedly mounted on the upper part of the support plate (5); the two support blocks (6) are rotatably connected to the two mounting seats (4) via a rotating shaft structure (7), and the rotating shaft structure (7) can be locked; The detection seat (8) is located above the support plate (5); the force sensor 1 (10) is installed between the detection seat (8) and a support block (6) and is used to detect the axial force of the rotating shaft structure (7); the fixing block (11) is fixedly connected to the upper side of the detection seat (8); the cover body (13) is at least partially located on the upper side of the detection seat (8); the force sensor 2 (12) is installed between the fixing block (11) and the cover body (13) and is used to detect the axial force from top to bottom and perpendicular to the axial force of the rotating shaft structure (7).

2. The rock friction angle tester according to claim 1, characterized in that: Two groups of guide slide rods (9) are fixedly installed between the two support blocks (6), the detection seat (8) is slidably connected to the guide slide rods (9), and the length direction of the guide slide rods (9) is parallel to the axial direction of the rotating shaft structure (7).

3. The rock friction angle tester according to claim 1, characterized in that: The force sensor 1 (10) comprises two detection ends 1 (1001), and the two detection ends 1 (1001) are respectively connected to a detection seat (8) and a support block (6); the force sensor 2 (12) is fixedly mounted on the fixed block (11), and the force sensor 2 (12) comprises a detection end 2 (1201), and the detection end 2 (1201) is arranged upward and fixedly connected to the cover body (13).

4. The rock friction angle tester according to claim 1, characterized in that: An anti-slip pad (3) is fixedly mounted on the lower side of the bottom plate (1).

5. The rock friction angle tester according to claim 1, characterized in that: The rotating shaft structure (7) comprises an axis body (701), wherein the axis body (701) is fixedly connected to the support block (6), the mounting seat (4) is provided with an axis hole (702) adapted to the axis body (701), the axis body (701) is rotatably connected in the axis hole (702), and the rotating shaft structure (7) further comprises a locking bolt (704), wherein the locking bolt (704) is used to lock the rotating shaft structure (7).

6. The rock friction angle tester according to claim 5, characterized in that: The end of the shaft hole (702) away from the support block (6) is fixedly connected with an annular protrusion (703), and the end surface of the shaft body (701) is provided with a threaded hole (706). The locking bolt (704) passes through the annular protrusion (703) and is threadedly connected to the threaded hole (706) of the shaft body (701). The screw head (705) of the locking bolt (704) can abut against the end surface of the annular protrusion (703) to achieve friction locking.

7. The rock friction angle tester according to claim 1, characterized in that: Extension blocks (601) are fixedly connected to both sides of the support block (6), and the extension block (601) is threadedly connected to a support bolt (15). The support bolt (15) passes through the extension block (601) from top to bottom, and the lower end of the support bolt (15) is used to abut against the bottom plate (1). The four support bolts (15) abut against the bottom plate (1), thereby achieving limited fixation of the support plate (5) and the bottom plate (1).

8. The rock friction angle tester according to claim 1, characterized in that: The fixed block (11) is installed with a plurality of guide sleeves (14), and the guide sleeves (14) are used to guide the cover body (13) up and down, and the guiding direction is parallel to the force direction of the force sensor 2 (12); the cover body (13) is fixedly connected with a plurality of guide columns, and the guide columns are matched with the guide sleeves (14) one by one, and are inserted into the guide sleeves (14) to realize sliding guidance.

9. A rock friction angle test method, characterized in that: A rock friction angle tester as described in any one of claims 1 to 8 is used for testing, and rock block 1 (17) and rock block 2 (18) are selected, wherein rock block 1 (17) has a test surface 1 (1701) and a pressure surface (1702), and the test surface 1 (1701) and the pressure surface (1702) are respectively located on both sides of rock block 1 (17), and rock block 2 (18) has a test surface 2 (1801), and the test surface 1 (1701) and the test surface 2 (1801) are adapted to each other; The test surface 1 (1701) of the rock block 1 (17) is pressed against the test surface 2 (1801) of the rock block 2 (18), and the mounting base (4) of the rock friction angle tester is placed on the pressure surface (1702) of the rock block 1 (17). The rotating shaft structure (7) is unlocked, and the test module (2) can rotate around the rotating shaft structure (7). Under the action of the deadweight of the test module (2), the test module (2) will be automatically leveled; Pressure is applied downwards to the test module (2) from the cover (13). During the test, the direction of the applied pressure is first perpendicular to the upper side of the cover (13), and then tilted and adjusted along the end direction of the rotating shaft structure (7) until rock block 1 (17) and rock block 2 (18) produce relative slip; force sensor 1 (10) and force sensor 2 (12) respectively record the forces in two directions, and the forces in the two directions are perpendicular to each other.

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