Double-drop-hammer parallel test device and method for testing impact characteristics of rock mass

Abstract

The invention provides a double-drop-hammer parallel test device and method for testing rock mass impact characteristics, and relates to the technical field of rock mechanics testing, the test device comprises a high-strength spring energy storage mechanism, a drop hammer impact mechanism and a triaxial confining pressure mechanism, the high-strength spring energy storage mechanism is matched with the drop hammer impact mechanism, and the triaxial confining pressure mechanism is matched with the high-strength spring energy storage mechanism. The mass and the height of the drop hammer can be flexibly adjusted, and accurate control over the total impact energy is achieved; wheels convenient to move are arranged below a triaxial chamber of the triaxial confining pressure mechanism, triaxial loading is carried out on an impact test piece through a piston and a test piece pressing block of the triaxial confining pressure mechanism, then the impact resistance of the rock mass can be tested, in addition, a double-drop-hammer impact system of the testing device can achieve parallel testing, and two or more sets of tests can be carried out at the same time. The device improves the flexibility, applicability and test efficiency of test equipment by optimizing an impact energy adjusting mode, reducing the height of the equipment and introducing a parallel test function, so that the mechanical response of a rock mass under different impact conditions is more accurately simulated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rock mechanics testing, and particularly provides a double-drop hammer parallel test device and method for testing rock mass impact characteristics. BACKGROUND

[0002] The impact resistance of rock mass refers to the ability of rock mass to resist damage when subjected to impact load, mainly manifested as dynamic mechanical properties and response mechanisms under impact load. The impact resistance of rock mass is crucial for the prevention and control of underground rock mass dynamic disasters, especially in deep high-stress environments, where the impact resistance, dynamic damage and failure characteristics of rock mass need special attention. In deep underground engineering, in order to effectively prevent and control rock mass impact disasters (such as rock burst or rock pressure), techniques such as borehole pressure relief and anchor energy absorption support are often used to reduce or avoid the harm caused by impact.

[0003] In the study of rock mass impact dynamic failure, both Hopkinson pressure bar and drop hammer testing machine are widely used to evaluate the impact resistance of materials and structures under dynamic loading conditions. Hopkinson pressure bar test is a method commonly used for dynamic material performance testing under high strain rate conditions. This method generates high strain rates by transmitting shock waves, thereby simulating the behavior of materials or structures under explosion or high-speed impact. In the study, Hopkinson pressure bar is often used to simulate the effects of seismic waves, mine blasting or other impact loads on rock mass, to study the mechanical response of rock mass under impact load, including crack propagation, failure mode and other characteristics. Drop hammer testing machine is usually used to evaluate the impact resistance of materials or structures when subjected to instantaneous impact. Its basic structure includes a heavy hammer, guide rail, impact platform and specimen clamp. The testing machine lifts a hammer of a certain mass to a predetermined height, then lets the hammer fall freely, impacting the rock mass sample, thereby simulating the impact load in the actual working environment. In the study of rock mass impact dynamic failure, drop hammer testing machine can simulate the situation of heavy objects impacting rock mass with different heights and masses. It studies the failure mode of rock mass when subjected to strong impact by applying instantaneous high-intensity impact force, especially in practical applications such as impact load conditions in mining or civil engineering, the failure process of rock mass can be evaluated by this method.

[0004] The existing drop hammer testing machine has the following deficiencies: 1. The impact energy adjustment mode of the existing device is too single, and the energy can only be controlled by adjusting the height or mass of the drop hammer; 2. The height of the existing drop hammer testing machine is usually more than 8 meters, and when the impact energy demand increases, the height of the device may further increase, and some designs even reach more than 20 meters, which makes the device unable to be applied to a conventional laboratory environment; 3. The existing device does not have a parallel test function, and multiple tests cannot be performed simultaneously, which makes it impossible to verify the repeatability of the test results in real time. Therefore, it is necessary to optimize the impact energy adjustment mode, reduce the height of the device, and introduce a parallel test function to improve the flexibility, applicability and testing efficiency of the testing device. SUMMARY

[0005] In order to more accurately simulate the mechanical response of rock mass under different impact conditions and effectively evaluate the impact resistance of rock mass under triaxial confining pressure conditions, the present application provides a double-drop hammer parallel test device and method for testing the impact characteristics of rock mass, and the specific technical solutions are as follows.

[0006] A double-drop hammer parallel test device for testing the impact characteristics of rock mass, comprising a high-strength spring energy storage mechanism, a drop hammer impact mechanism and a triaxial confining pressure mechanism, the high-strength spring energy storage mechanism is installed on an outer guide light pole, the high-strength spring energy storage mechanism comprises a spring retaining ring, a high-strength spring and a spring protection sleeve, the inner diameter of the spring retaining ring is the same as the inner diameter of the cutting ring on the outer guide light pole, and the impact energy is adjusted by adjusting the compression amount of the high-strength spring; the drop hammer impact mechanism comprises a hammer body mechanism and a hammer body lifting mechanism, and the hammer body mechanism and the hammer body lifting mechanism cooperate to control and adjust the impact energy; the triaxial confining pressure mechanism is provided with wheels below the triaxial chamber to facilitate movement, and the triaxial loading of the impact test piece is realized through the piston and the test piece pressing block of the triaxial confining pressure mechanism.

[0007] Preferably, the triaxial confining pressure mechanism comprises a car plate, an axle, wheels, a triaxial chamber, a self-balancing cover, a piston, a test piece pressing block and a pressure chamber cover; the triaxial chamber is provided with a piston, the end of the piston is connected to the test piece pressing block, the triaxial chamber is provided with a pressure chamber cover at the top, the pressure chamber cover is provided with a hydraulic pipeline, and the impact test piece is fixed between the test piece pressing blocks; the triaxial chamber is provided with a car plate below, the wheels are fixed at both ends of the axle, and the wheels move along the guide rail on the bottom plate.

[0008] Preferably, the high-strength spring energy storage mechanism is arranged at the upper end of the outer guide light pole, the high-strength spring energy storage mechanism comprises a spring retaining ring, a high-strength spring and a spring protection sleeve, the high-strength spring and the spring protection sleeve are sleeved on the outer guide light pole, the spring protection sleeve is a telescopic sleeve structure, and the spring retaining ring is arranged at the end of the spring protection sleeve; the lower end of the outer guide light pole is provided with an impact shock-absorbing spring.

[0009] Preferably, the outer guide light pole is fixed between the top plate and the bottom plate, and the high-strength spring energy storage mechanism, the drop hammer impact mechanism and the three-axis confining pressure mechanism are all provided with two or more.

[0010] Preferably, a fixed pulley block is arranged on the top plate, and the fixed pulley block is connected with the drop hammer impact mechanism through a steel wire rope.

[0011] Preferably, the drop hammer impact mechanism comprises a hammer body mechanism and a hammer body lifting mechanism, the hammer body mechanism is connected into a box structure by an upper bearing plate, a lower bearing plate and a side baffle, a spring compression plate connected at both ends of the lower bearing plate of the hammer body is installed between the outer guide light pole and the inner guide light pole, and the spring compression plate below the hammer body mechanism is fixedly connected through a rigid connecting plate; a hammer body hanging shaft frame is installed on the upper bearing plate of the hammer body; a through hole is arranged on a group of parallel stretching bosses of the hammer body hanging shaft frame, a middle through hole is matched with a fixed hanging pin, and both end through holes are matched with a parallel double shaft hanging seat.

[0012] Preferably, the hammer body lifting mechanism comprises an inner punching plate, an outer punching plate, a lifting device guide seat, a lifting hook, a lifting falling oil cylinder and a lifting pulley block; the lifting device guide seat, the lifting hook, the hook shaft, the lifting falling oil cylinder and the lifting pulley block are installed between the inner punching plate and the outer punching plate; the end of the lifting hook is connected with the lifting falling oil cylinder, the lower end is connected with the fixed hook when the lifting hook falls, and the hammer body lifting mechanism and the hammer body mechanism are connected.

[0013] A double-drop hammer parallel test method for testing rock mass impact characteristics, using the double-drop hammer parallel test device for testing rock mass impact characteristics, the steps comprise:

[0014] S1. Preparing two rock mass impact test pieces;

[0015] S2. Placing the impact test pieces between the test piece pressing blocks of the triaxial chamber respectively, and applying confining pressure through the triaxial chamber;

[0016] S3. Determining the mass of the added weight according to the estimated required impact energy;

[0017] S4. Controlling the oil pressure of the lifting falling oil cylinder, so that the lower end of the lifting hook hooks the fixed hanging pin, the two hanging shafts of the parallel double shaft hanging seat pass through the through holes of the outer punching plate and the through holes at both ends of the hammer body hanging shaft frame in sequence, and are fixedly connected with the inner punching plate, at this time, the drop hammer mechanism and the drop hammer lifting mechanism are connected together;

[0018] S5. Lifting the drop hammer mechanism and the drop hammer lifting mechanism to the set position through the lifting pulley block on the hammer body lifting mechanism;

[0019] S6. Install a mobile drop-off oil cylinder between the outer punch plate of the drop hammer lifting mechanism and the baffle plate of the parallel double shaft hanging seat, and pull out the parallel double shaft hanging seat by controlling the oil pressure, so that the drop hammer mechanism and the drop hammer lifting mechanism are connected only through the lifting hook and the fixed hanging pin;

[0020] S7. Control the lifting and dropping oil cylinder to make the lifting hook rise, the drop hammer mechanism and the drop hammer lifting mechanism separate, the drop hammer mechanism fall down, the impact load is transmitted to the rock mass impact test piece, the pressure change of the impact is recorded through the pressure sensor, and the crack propagation and failure mode of the impact test piece are recorded, so as to test the impact resistance of the rock mass.

[0021] Further preferably, the triaxial chamber applies the same or different confining pressure to the two impact test pieces respectively, and the drop hammer impact mechanism applies different impact energy or the same impact energy to the impact test pieces respectively.

[0022] The beneficial effects of the double drop hammer parallel test device and method for testing the impact characteristics of rock mass provided by the application include:

[0023] (1) Through the innovative combination of the impact testing machine and the self-balancing triaxial pressure chamber, the stress state of the deep rock mass under the extremely complex environment of "high ground stress static load + sudden dynamic disturbance" is completely and accurately reproduced on the laboratory scale. The design of the self-balancing triaxial pressure chamber facilitates the installation, disassembly and sealing of the test piece, and in combination with the controllability of the impact testing machine, the combined system can support efficient and continuous impact tests on multiple test pieces of the same type or under different stress paths.

[0024] (2) The spring compression and drop hammer potential energy method is used to coordinate the impact energy supply of the rock mass test piece, and the response of the rock mass under single and multiple continuous mine earthquakes and other external impact forces is simulated. The sudden release of the spring compression energy storage (simulating energy accumulation and instantaneous release) combined with the impact of the drop hammer (simulating stress wave propagation) can more realistically reproduce the dynamic loading process of the rock mass under high strain rate and high stress amplitude in real mine earthquakes.

[0025] (3) The spring and drop hammer as the core energy storage and release elements have relatively simple and robust structures, strong adaptability to the use environment (such as rock mass impact and crushing dust), and low maintenance cost requirements. After a single impact is completed, the spring can be quickly compressed and the drop hammer can be lifted to a predetermined position through an efficient mechanical or auxiliary driving mechanism (such as a motor or a hydraulic cylinder) to store energy for the next impact, and the test process is fast and convenient.

[0026] (4) The test device can simultaneously perform two or more tests, verify the repeatability of the test results in real time, greatly improve the test efficiency, save time and cost, enhance the repeatability and reliability of the test results, and meet the requirements of higher efficiency and accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a side view of a double-drop hammer coordinated impact test system

[0028] Figure 2 is an axonometric view of a double-drop hammer coordinated impact test system

[0029] Figure 3 is an axonometric view of a high-strength spring mechanism and drop hammer impact mechanism

[0030] Figure 4 is a sectional view of a high-strength spring mechanism and drop hammer impact mechanism

[0031] Figure 5 is a schematic view of a true triaxial confining pressure mechanism

[0032] Figure 6 is a sectional view of a true triaxial confining pressure mechanism

[0033] wherein: 100 - high-strength spring energy storage mechanism; 200 - drop hammer impact mechanism; 300 - triaxial confining pressure mechanism; 1 - top plate; 2 - fixed pulley block; 3 - bottom plate; 4 - outer guide light pole; 5 - inner guide light pole; 6 - impact shock-resistant spring; 7 - spring stop ring; 8 - high-strength spring; 9 - spring protection sleeve; 10 - upper pressure bearing plate; 11 - lower pressure bearing plate; 12 - connecting plate; 13 - side stop plate; 14 - hammer body guide seat; 15 - spring compression plate; 16 - impact hammer; 17 - hammer body hanging shaft support; 18 - fixed hanging pin; 19 - inner punching plate; 20 - outer punching plate; 21 - lifting device guide seat; 22 - lifting pulley block; 23 - lifting hook; 24 - lifting and falling oil cylinder; 25 - parallel double-axle hanging seat; 26 - moving and falling oil cylinder; 27 - trolley plate; 28 - trolley axle; 29 - trolley wheel; 30 - triaxial chamber; 31 - self-balancing cover; 32 - piston; 33 - test piece pressure block; 34 - impact test piece; 35 - pressure chamber cover. DETAILED DESCRIPTION

[0034] In combination Figures 1 to 6 with the drawings, specific embodiments of a double-drop hammer parallel test device and method for testing impact properties of rock mass provided by the present application are described.

[0035] The application discloses a double-hammer parallel test device for testing rock mass impact characteristics, which comprises a high-strength spring energy storage mechanism, a hammer impact mechanism and a triaxial confining pressure mechanism.

[0036] The triaxial confining pressure mechanism 300 comprises a car plate 27, a car axle 28, a car wheel 29, a triaxial chamber 30, a self-balancing cover 31, a piston 32, a specimen pressing block 33 and a pressure chamber cover 35; the piston 32 is arranged in the triaxial chamber 30, the end of the piston 32 is connected with the specimen pressing block 33, the triaxial chamber 30 is provided with the pressure chamber cover 35, and the pressure chamber cover 35 is provided with a hydraulic pipeline. The impact specimen 34 is fixed between the specimen pressing blocks 33; the triaxial chamber 30 is provided with the car plate below, the car wheels 29 are fixed at the two ends of the car axle 28, and the car wheels 29 move along the guide rails on the bottom plate.

[0037] The high-strength spring energy storage mechanism 100 is arranged at the upper end of the outer guide light pole 4, and comprises a spring stop ring 7, a high-strength spring 8 and a spring protection sleeve 9; the high-strength spring 8 and the spring protection sleeve 9 are sleeved on the outer guide light pole, the spring protection sleeve is of an extension sleeve structure, and the spring stop ring 7 is arranged at the end of the spring protection sleeve; and the lower end of the outer guide light pole 4 is provided with impact shock-resistant springs.

[0038] The outer guide light pole 4 is fixed between the top plate and the bottom plate, and the high-strength spring energy storage mechanism 100, the hammer impact mechanism and the triaxial confining pressure mechanism are arranged in two or more numbers. The fixed pulley block is arranged on the top plate and connected with the hammer impact mechanism through a steel wire rope.

[0039] The hammer impact mechanism 200 comprises a hammer body mechanism and a hammer body lifting mechanism; the hammer body mechanism is connected into a box structure by an upper pressure bearing plate 10, a lower pressure bearing plate 11 and a side stop plate 13, the spring compression plate 15 connected at the two ends of the lower pressure bearing plate of the hammer body is arranged between the outer guide light pole 4 and the inner guide light pole 5, and the spring compression plate below the hammer body mechanism is fixedly connected through a rigid connecting plate; the hammer body hanging shaft frame is arranged on the upper pressure bearing plate of the hammer body; a group of parallel stretching bosses of the hammer body hanging shaft frame 17 are provided with through holes, the middle through hole is matched with a fixed hanging pin, and the two end through holes are matched with a parallel double-shaft hanging seat 25.

[0040] The hammer lifting mechanism comprises an inner punched plate 19, an outer punched plate 20, a lifting device guide seat 21, a lifting hook 23, a lifting falling oil cylinder 24 and a lifting pulley block 22; the lifting device guide seat 21, the lifting hook 23, the hook shaft, the lifting falling oil cylinder and the lifting pulley block 22 are installed between the inner punched plate 19 and the outer punched plate; the end of the lifting hook 23 is connected with the lifting falling oil cylinder 24, and the lower end is connected with the fixed hook when the lifting hook 23 falls, thereby connecting the hammer lifting mechanism and the hammer mechanism.

[0041] The falling hammer impact test device has higher flexibility and applicability, and is particularly suitable for adjustment of different impact energy ranges and parallel operation of the same test.

[0042] A double-falling hammer parallel test method for testing impact properties of rock mass, which utilizes the double-falling hammer parallel test device for testing impact properties of rock mass, and comprises the following steps:

[0043] S1. Preparing two rock mass impact test pieces;

[0044] S2. Placing the impact test pieces between the test piece pressing blocks of the triaxial chamber respectively, and applying confining pressure through the triaxial chamber;

[0045] S3. Determining the weight of the added weight according to the estimated required impact energy;

[0046] S4. Controlling the oil pressure of the lifting falling oil cylinder to make the lower end of the lifting hook hook the fixed hook pin, and sequentially passing the two hook shafts of the parallel double-axle hanging seat through the through holes of the outer punched plate, the through holes at both ends of the hammer hook shaft frame and the fixed connection with the inner punched plate, at this time, the falling hammer mechanism and the falling hammer lifting mechanism are connected together;

[0047] S5. Lifting the falling hammer mechanism and the falling hammer lifting mechanism to the set position through the lifting pulley block on the hammer lifting mechanism;

[0048] S6. Installing the moving falling oil cylinder between the outer punched plate of the falling hammer lifting mechanism and the baffle of the parallel double-axle hanging seat, and pulling out the parallel double-axle hanging seat by controlling the oil pressure, so that the falling hammer mechanism and the falling hammer lifting mechanism are connected only through the lifting hook and the fixed hook pin;

[0049] S7. Controlling the lifting falling oil cylinder to make the lifting hook rise, and the falling hammer mechanism and the falling hammer lifting mechanism are separated, the falling hammer mechanism falls down, the impact load is transmitted to the rock mass impact test piece, the pressure change of the impact is recorded through the pressure sensor, and the crack propagation and failure mode of the impact test piece are recorded, and the impact resistance of the rock mass is tested.

[0050] The triaxial chamber respectively applies same or different confining pressures to two impact test pieces, and the drop hammer impact mechanism respectively applies different impact energies or same impact energy to the impact test pieces.

[0051] The drop hammer testing machine can effectively evaluate the impact resistance of the borehole pressure-relieved rock mass by simulating the response of the rock mass under the impact load, and analyze the influence of the pressure-relief process on the impact bearing capacity, crack propagation and local damage of the rock mass. Especially after the pressure relief, the influence of the internal cracks, voids and rock deformation characteristics of the rock mass on the impact response is complex and has differences, which needs to be accurately verified by the test. The test device and test method can realize the repetition of the test.

[0052] Of course, the above description is not a limitation on the present application, and the present application is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the spirit and scope of the present application should also be within the protection scope of the present application.

Claims

1. A double-drop hammer parallel test device for testing impact properties of rock mass, characterized in that, The high-strength spring energy storage mechanism is installed on the outer guide light pole, and comprises a spring stop ring, a high-strength spring and a spring protection sleeve, the inner diameter of the spring stop ring is the same as the inner diameter of the cutting ring on the outer guide light pole, and the impact energy is adjusted by adjusting the compression amount of the high-strength spring; the drop hammer impact mechanism comprises a hammer body mechanism and a hammer body lifting mechanism, and the hammer body mechanism and the hammer body lifting mechanism are matched to control and adjust the impact energy; the three-axial confining pressure mechanism is provided with wheels below the three-axial chamber to facilitate movement, and the three-axial loading on the impact specimen is realized through the piston and the specimen pressing block of the three-axial confining pressure mechanism.

2. The double-drop hammer parallel test device for testing impact properties of rock mass according to claim 1, wherein, The three-axial confining pressure mechanism comprises a car plate, an axle, wheels, a three-axial chamber, a self-balancing cover, a piston, a specimen pressing block and a pressure chamber cover; the piston is arranged in the three-axial chamber, the end of the piston is connected to the specimen pressing block, the pressure chamber cover is arranged above the three-axial chamber, the hydraulic pipeline is arranged on the pressure chamber cover, and the impact specimen is fixed between the specimen pressing blocks; the car plate is arranged below the three-axial chamber, the wheels are fixed at both ends of the axle, and the wheels move along the guide rail on the bottom plate.

3. The double-drop hammer parallel test device for testing impact properties of rock mass according to claim 2, characterized in that, The high-strength spring energy storage mechanism is arranged at the upper end of the outer guide light pole, and comprises a spring stop ring, a high-strength spring and a spring protection sleeve, the high-strength spring and the spring protection sleeve are sleeved on the outer guide light pole, the spring protection sleeve is of an extension sleeve structure, and the spring stop ring is arranged at the end of the spring protection sleeve; the lower end of the outer guide light pole is provided with an impact shock-resistant spring.

4. The double-drop hammer parallel test device for testing impact properties of rock mass according to claim 3, characterized in that, The outer guide light pole is fixed between the top plate and the bottom plate, and the high-strength spring energy storage mechanism, the drop hammer impact mechanism and the three-axial confining pressure mechanism are all provided with two or more.

5. The double-drop hammer parallel test device for testing impact properties of rock mass according to claim 4, characterized in that, The fixed pulley block is arranged on the top plate and connected to the drop hammer impact mechanism through a steel wire rope.

6. The double-drop weight parallel testing device for testing impact properties of rock mass according to claim 5, wherein, The drop hammer impact mechanism comprises a hammer body mechanism and a hammer body lifting mechanism, the hammer body mechanism is connected into a box structure by an upper pressure bearing plate, a lower pressure bearing plate and a side stop plate, the spring compression plate connected at both ends of the lower pressure bearing plate of the hammer body is arranged between the outer guide light pole and the inner guide light pole, and the spring compression plate below the hammer body mechanism is fixedly connected through a rigid connecting plate; the hammer body hanging shaft frame is arranged on the upper pressure bearing plate of the hammer body; a group of parallel stretching bosses of the hammer body hanging shaft frame are provided with through holes, the middle through hole is matched with a fixed hanging pin, and the two end through holes are matched with a parallel double shaft hanging seat.

7. The double-drop hammer parallel test device for testing impact properties of rock mass according to claim 6, characterized in that, The hammer body lifting mechanism comprises an inner punching plate, an outer punching plate, a lifting device guide seat, a lifting hook, a lifting falling oil cylinder and a lifting pulley block; the lifting device guide seat, the lifting hook, the hook shaft, the lifting falling oil cylinder and the lifting pulley block are arranged between the inner punching plate and the outer punching plate; the end of the lifting hook is connected with the lifting falling oil cylinder, the lower end is connected with the fixed hook when the lifting hook falls, and the hammer body lifting mechanism and the hammer body mechanism are connected.

8. A method for testing impact properties of rock mass by using the double-drop parallel test device for testing impact properties of rock mass according to any one of claims 1 to 7, characterized in that the steps of The method comprises the following steps: S1. preparing two rock mass impact specimens; S2. fixing the impact specimens between the specimen pressing blocks of the three-axial chamber and applying confining pressure through the three-axial chamber; S3. determining the weight of the added weight according to the estimated required impact energy; S4. Control the oil pressure of the lifting and falling cylinder to make the lower end of the lifting hook hook the fixed hanging pin, and make the two hanging shafts of the parallel double-shaft hanging seat fixedly connected through the through holes of the outer punching plate, the through holes at both ends of the hammer body hanging shaft frame and the inner punching plate. At this time, the hammer falling mechanism and the hammer lifting mechanism are connected together; S5. The hammer falling mechanism and the hammer lifting mechanism are lifted to the set position through the lifting pulley block on the hammer lifting mechanism; S6. The moving falling cylinder is installed between the outer punching plate of the hammer lifting mechanism and the baffle of the parallel double-shaft hanging seat, and the parallel double-shaft hanging seat is pulled out by controlling the oil pressure, so that the hammer falling mechanism and the hammer lifting mechanism are connected only through the lifting hook and the fixed hanging pin; S7. The lifting and falling cylinder is controlled to make the lifting hook rise, and the hammer falling mechanism and the hammer lifting mechanism are separated, the hammer falling mechanism falls down, the impact load is transmitted to the rock impact specimen, the pressure change of the impact is recorded through the pressure sensor, and the crack propagation and failure mode of the impact specimen are recorded, so as to test the impact resistance of the rock mass.

9. The double-drop hammer parallel test method for testing impact properties of rock mass according to claim 8, characterized in that, The triaxial chamber respectively applies the same or different confining pressures to two impact specimens, and the hammer impact mechanism respectively applies different impact energies or the same impact energy to the impact specimens.

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