Deep engineering hard rock true triaxial dynamic disturbance aging fracture testing device

Abstract

A deep engineering hard rock true triaxial dynamic disturbance aging fracture testing device belongs to the technical field of rock mechanics tests and comprises a counter-force frame, a pressure chamber and six main stress linear disturbance actuators. The main stress linear disturbance actuator comprises a linear disturbance motor and a main stress hydraulic cylinder; the linear disturbance motor is coaxially and fixedly installed at the outer end of a cylinder barrel of the main stress hydraulic cylinder, a dowel bar is arranged in a central hole channel of a piston rod of the main stress hydraulic cylinder, and a power output shaft of the linear disturbance motor is coaxially and fixedly connected with the dowel bar. According to the utility model, the matching form of a traditional dynamic actuator and a hydraulic oil source is abandoned, the linear motor is introduced into the true triaxial test equipment as a power disturbance source, the long-time dynamic disturbance structure of the true triaxial test equipment is simplified, and the energy consumption of the equipment is greatly reduced after the linear motor is used as the power disturbance source; the maintenance process is simpler, the maintenance cost is greatly reduced, the installation and debugging processes of the linear motor are more time-saving and labor-saving, and no extra floor area is needed.

Description

Technical Field

[0001] The utility model belongs to the technical field of rock mechanics tests, and particularly relates to a deep engineering hard rock true triaxial dynamic disturbance aging fracture test device. Background Technique

[0002] After the excavation of deep engineering, the tangential stress increases exponentially, and the radial stress decreases sharply. With the increase of the stress difference, the surrounding rock will be in an unfavorable stress state. After encountering dynamic disturbances, the cracks in the surrounding rock will continuously accumulate, and the bearing capacity of the surrounding rock will also continue to decline. When the bearing capacity of the surrounding rock is less than the excavation stress, the surrounding rock will become unstable, and even time-delay rock bursts may occur, thus seriously threatening the safety of construction personnel and equipment.

[0003] Due to the complex and changeable stress state of deep surrounding rock, the research direction of deep rock mechanics has also undergone a major transformation, gradually shifting from the research of uniaxial and biaxial stress states in the past to the research of deep true triaxial stress states. In addition, due to the strong disturbance stress environment in deep engineering, the research perspective of rock mechanics has gradually shifted from traditional macroscopic statics to mesoscopic rock dynamics, not only needing to pay attention to the mechanical behavior of rocks under static conditions, but also needing to pay attention to the stress response and fracture mechanism of rocks under dynamic conditions.

[0004] Therefore, it is very necessary to carry out dynamic disturbance test research under true triaxial conditions. At present, when true triaxial testing machines carry out dynamic disturbance tests, they are mainly divided into instantaneous dynamic disturbance tests and long-term aging dynamic disturbance tests. Data from a large number of on-site investigations of deep engineering show that the disturbance stress effects on deep engineering surrounding rock are persistent, and in terms of the stress on the surrounding rock, it often presents two typical modes of true triaxial compression and shear. This long-term aging dynamic disturbance will cause high-frequency fatigue opening and closing of internal cracks in rocks, affect the storage and release of internal energy in hard rocks, change the ductile and brittle characteristics of rock masses, and finally result in brittle fractures with aging characteristics. The occurrence of time-delay rock bursts is related to this long-term aging, high-frequency, and low-amplitude disturbance effects. Therefore, relevant research can only be carried out through long-term aging dynamic disturbance tests.

[0005] At present, although there are many types of true triaxial test equipment that can carry out long-term aging dynamic disturbance tests, the problems existing in carrying out long-term aging dynamic disturbance tests by relying on the cooperation of dynamic actuators and hydraulic oil sources have not been effectively overcome. The specific problems are as follows:

[0006] ①. High energy consumption

[0007] When a dynamic actuator is combined with a hydraulic oil source, there are certain losses in the energy transmission process. For example, energy losses are caused by factors such as the viscosity of the oil and pipeline friction. Therefore, the energy efficiency is relatively low. Moreover, during the test process, the temperature of the oil source will gradually increase as the test progresses, which further affects the performance of the hydraulic oil source. Prolonged high temperatures also pose certain safety hazards. Therefore, there are obvious application limitations in carrying out long-term dynamic disturbance tests with the combination of a dynamic actuator and a hydraulic oil source.

[0008] ②. High maintenance cost

[0009] To ensure the operational stability of the hydraulic system where the dynamic actuator and the hydraulic oil source are located, it is necessary not only to regularly replace the oil in the hydraulic system but also to regularly inspect and maintain the valves, seals, etc. in the hydraulic system. Especially under long-term operation and high-load working conditions, the oil replacement, inspection, and maintenance will be more frequent, resulting in a high maintenance cost.

[0010] ③. Complex hydraulic system

[0011] Since there are a large number of components such as pipelines, hydraulic pumps, oil cylinders, valves, and seals in the hydraulic system where the dynamic actuator and the hydraulic oil source are located, the structure of the hydraulic system is very complex. This not only makes the installation and commissioning process of the hydraulic system time-consuming and laborious but also requires additional installation space for the hydraulic system, resulting in a larger floor area required for the true triaxial test equipment. Summary of the invention

[0012] Aiming at the problems existing in the prior art, the utility model provides a deep engineering hard rock true triaxial dynamic disturbance aging fracture test device, which abandons the traditional form of combining a dynamic actuator and a hydraulic oil source. For the first time, a linear motor is introduced as a dynamic disturbance source into the true triaxial test equipment, greatly simplifying the long-term dynamic disturbance structure of the true triaxial test equipment. After using the linear motor as the dynamic disturbance source, the energy consumption of the equipment is greatly reduced, the maintenance process is simpler, and the maintenance cost is also greatly reduced. The installation and commissioning process of the linear motor is also more time-saving and laborious, and there is no additional floor area requirement.

[0013] To achieve the above object, the utility model adopts the following technical solution: A deep engineering hard rock true triaxial dynamic disturbance aging fracture test device, comprising a reaction frame, a pressure chamber, a first major principal stress linear disturbance actuator, a second major principal stress linear disturbance actuator, a first intermediate principal stress linear disturbance actuator, a second intermediate principal stress linear disturbance actuator, a first minor principal stress linear disturbance actuator and a second minor principal stress linear disturbance actuator; the reaction frame adopts a rectangular frame structure and is vertically arranged; the pressure chamber adopts a hollow cylindrical structure, is horizontally arranged and inserted into the central hole of the reaction frame; a pressure chamber pulling and pushing driving oil cylinder is fixedly embedded inside the base body of the reaction frame, the pressure chamber pulling and pushing driving oil cylinder is parallel to the pressure chamber, the cylinder barrel of the pressure chamber pulling and pushing driving oil cylinder is fixedly connected with the base body of the reaction frame, and the piston rod of the pressure chamber pulling and pushing driving oil cylinder is fixedly connected with the pressure chamber; the first major principal stress linear disturbance actuator and the second major principal stress linear disturbance actuator are mirror-symmetrically distributed at both axial ends of the pressure chamber; the second major principal stress linear disturbance actuator and the first intermediate principal stress linear disturbance actuator are mirror-symmetrically distributed at the upper and lower ends of the reaction frame; the first minor principal stress linear disturbance actuator and the second minor principal stress linear disturbance actuator are mirror-symmetrically distributed at the left and right ends of the reaction frame.

[0014] The first major principal stress linear disturbance actuator, the second major principal stress linear disturbance actuator, the first intermediate principal stress linear disturbance actuator, the second intermediate principal stress linear disturbance actuator, the first minor principal stress linear disturbance actuator and the second minor principal stress linear disturbance actuator have the same structure, and each comprises a linear disturbance motor and a principal stress hydraulic cylinder; the piston rod of the principal stress hydraulic cylinder is of a hollow rod structure; the inner ends of the cylinder barrels of the first major principal stress linear disturbance actuator and the second major principal stress linear disturbance actuator are fixedly connected with the pressure chamber; the inner ends of the cylinder barrels of the first intermediate principal stress linear disturbance actuator, the second intermediate principal stress linear disturbance actuator, the first minor principal stress linear disturbance actuator and the second minor principal stress linear disturbance actuator are fixedly connected with the reaction frame; the linear disturbance motor is coaxially fixedly installed at the outer end of the cylinder barrel of the principal stress hydraulic cylinder, a force transmission rod is arranged in the central hole of the piston rod of the principal stress hydraulic cylinder, and the power output shaft of the linear disturbance motor is coaxially fixedly connected with the force transmission rod.

[0015] Inside the pressure chamber, there is a two-rigid-one-flexible type rock specimen fixture, a shear type rock specimen fixture or a three-rigid type rock specimen fixture.

[0016] When a rock specimen is clamped in a two-rigid-one-flexible rock specimen fixture, a disturbance hole is formed in the interlocking rigid cushion block of the two-rigid-one-flexible rock specimen fixture. The disturbance hole penetrates through the interlocking rigid cushion block. A two-rigid-one-flexible rock specimen fixture disturbance rod is coaxially arranged in the disturbance hole. One end of the two-rigid-one-flexible rock specimen fixture disturbance rod is coaxially and fixedly connected with a force transmission rod, and the other end of the two-rigid-one-flexible rock specimen fixture disturbance rod contacts the rock specimen.

[0017] When a rock specimen is clamped in a two-rigid-one-flexible rock specimen fixture, a self-stabilizing loading frame is equipped outside the two-rigid-one-flexible rock specimen fixture. A loading pressure head is arranged outside the interlocking rigid cushion block of the two-rigid-one-flexible rock specimen fixture. A through-hole is formed in the loading pressure head. The through-hole and the disturbance hole on the interlocking rigid cushion block are coaxially distributed. The force transmission rod passes through the through-hole and is connected with the two-rigid-one-flexible rock specimen fixture disturbance rod.

[0018] When a rock specimen is clamped in a two-rigid-one-flexible rock specimen fixture, a U-shaped deformation measurement bracket is arranged in the direction of the minimum principal stress of the rock specimen. A strain gauge is pasted on the surface of the U-shaped cross arm of the U-shaped deformation measurement bracket. A force transmission disc is installed between the end of one U-shaped support arm of the U-shaped deformation measurement bracket and the rock specimen. A disturbance cylinder seat is arranged outside the force transmission disc. The disturbance cylinder seat and the force transmission disc are coaxially distributed. The disturbance cylinder seat is coaxially and fixedly connected with the force transmission rod.

[0019] When a rock specimen is clamped in a shear-type rock specimen fixture, a disturbance hole is formed in the normal stress direction loading cushion block of the shear-type rock specimen fixture. The disturbance hole penetrates through the normal stress direction loading cushion block. A shear-type rock specimen fixture disturbance rod is coaxially arranged in the disturbance hole. One end of the shear-type rock specimen fixture disturbance rod is coaxially and fixedly connected with a force transmission rod, and the other end of the shear-type rock specimen fixture disturbance rod contacts the rock specimen.

[0020] When a rock specimen is clamped in a three-rigid rock specimen fixture, a disturbance hole is formed in the principal stress loading cushion block of the three-rigid rock specimen fixture. The disturbance hole penetrates through the principal stress loading cushion block. A three-rigid rock specimen fixture disturbance rod is coaxially arranged in the disturbance hole. One end of the three-rigid rock specimen fixture disturbance rod is coaxially and fixedly connected with a force transmission rod, and the other end of the three-rigid rock specimen fixture disturbance rod contacts the rock specimen.

[0021] The beneficial effects of the present utility model:

[0022] The deep engineering hard rock true triaxial dynamic disturbance aging fracture test device of the present utility model abandons the traditional form of cooperation between a dynamic actuator and a hydraulic oil source. For the first time, a linear motor is introduced as a dynamic disturbance source into the true triaxial test equipment, greatly simplifying the long-term aging dynamic disturbance structure of the true triaxial test equipment. After using the linear motor as the dynamic disturbance source, a significant reduction in equipment energy consumption is achieved, the maintenance process is simpler, and the maintenance cost is also greatly reduced. The installation and debugging process of the linear motor is also more time-saving and labor-saving, and there is no additional floor area requirement. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 FIG. is a schematic structural diagram of an overall deep engineering hard rock true triaxial dynamic disturbance aging fracture test device of the present utility model;

[0024] Figure 2 FIG. is a schematic structural diagram of a sectional view of a deep engineering hard rock true triaxial dynamic disturbance aging fracture test device of the present utility model;

[0025] Figure 3 FIG. is a schematic structural diagram of a sectional view of the principal stress linear disturbance actuator of the present utility model;

[0026] Figure 4 FIG. is a schematic structural diagram of a combined structure of a two-rigid-one-flexible rock specimen fixture and a self-stabilizing loading frame of the present utility model;

[0027] Figure 5 FIG. is a schematic structural diagram of a two-rigid-one-flexible rock specimen fixture of the present utility model;

[0028] Figure 6 FIG. is a schematic structural diagram of a U-shaped deformation measurement bracket of the present utility model;

[0029] Figure 7 FIG. is a schematic structural diagram of a shear-type rock specimen fixture of the present utility model;

[0030] Figure 8 FIG. is a schematic structural diagram of a three-rigid rock specimen fixture of the present utility model;

[0031] In the figure, 1 is a reaction force frame, 2 is a pressure chamber, 3 is a first maximum principal stress linear perturbation actuator, 4 is a second maximum principal stress linear perturbation actuator, 5 is a first intermediate principal stress linear perturbation actuator, 6 is a second intermediate principal stress linear perturbation actuator, 7 is a first minimum principal stress linear perturbation actuator, 8 is a second minimum principal stress linear perturbation actuator, 9 is a pressure chamber pulling and pushing drive oil cylinder, 10 is a linear perturbation motor, 11 is a principal stress hydraulic cylinder, 12 is a force transfer rod, 13 is a rock specimen, 14 is an interlocking rigid cushion block, 15 is a perturbation rod of a two-rigid-one-flexible rock specimen fixture, 16 is a self-stabilizing loading frame, 17 is a loading indenter, 18 is a through circular hole, 19 is a U-shaped deformation measurement bracket, 20 is a force transfer disk, 21 is a perturbation cylinder base, 22 is a normal stress direction loading cushion block, 23 is a perturbation rod of a shear-type rock specimen fixture, 24 is a principal stress loading cushion block, 25 is a perturbation rod of a three-rigid rock specimen fixture. Specific implementation mode

[0032] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] As Figures 1 to 8 shown, a true triaxial dynamic perturbation time-dependent fracture test device for hard rock in deep engineering includes a reaction force frame 1, a pressure chamber 2, a first maximum principal stress linear perturbation actuator 3, a second maximum principal stress linear perturbation actuator 4, a first intermediate principal stress linear perturbation actuator 5, a second intermediate principal stress linear perturbation actuator 6, a first minimum principal stress linear perturbation actuator 7 and a second minimum principal stress linear perturbation actuator 8; the reaction force frame 1 adopts a square structure and is vertically arranged; the pressure chamber 2 adopts a hollow cylindrical structure and is horizontally arranged and inserted into the central hole of the reaction force frame 1; a pressure chamber pulling and pushing drive oil cylinder 9 is fixedly embedded inside the base of the reaction force frame 1, the pressure chamber pulling and pushing drive oil cylinder 9 is parallel to the pressure chamber 2, the cylinder barrel of the pressure chamber pulling and pushing drive oil cylinder 9 is fixedly connected to the base of the reaction force frame 1, and the cylinder rod of the pressure chamber pulling and pushing drive oil cylinder 9 is fixedly connected to the pressure chamber 2; the first maximum principal stress linear perturbation actuator 3 and the second maximum principal stress linear perturbation actuator 4 are mirror-symmetrically distributed at both axial ends of the pressure chamber 2; the second maximum principal stress linear perturbation actuator 4 and the first intermediate principal stress linear perturbation actuator 5 are mirror-symmetrically distributed at the upper and lower ends of the reaction force frame 1; the first minimum principal stress linear perturbation actuator 7 and the second minimum principal stress linear perturbation actuator 8 are mirror-symmetrically distributed at the left and right ends of the reaction force frame 1.

[0034] The first major principal stress linear perturbation actuator 3, the second major principal stress linear perturbation actuator 4, the first intermediate principal stress linear perturbation actuator 5, the second intermediate principal stress linear perturbation actuator 6, the first minor principal stress linear perturbation actuator 7 and the second minor principal stress linear perturbation actuator 8 have the same structure, and each includes a linear perturbation motor 10 and a principal stress hydraulic cylinder 11; the piston rod of the principal stress hydraulic cylinder 11 is of a hollow rod structure; the inner ends of the cylinder barrels of the principal stress hydraulic cylinders 11 of the first major principal stress linear perturbation actuator 3 and the second major principal stress linear perturbation actuator 4 are fixedly connected to the pressure chamber 2; the inner ends of the cylinder barrels of the first intermediate principal stress linear perturbation actuator 5, the second intermediate principal stress linear perturbation actuator 6, the first minor principal stress linear perturbation actuator 7 and the second minor principal stress linear perturbation actuator 8 are fixedly connected to the reaction frame 1; the linear perturbation motor 10 is coaxially and fixedly installed at the outer end of the cylinder barrel of the principal stress hydraulic cylinder 11, a force transmission rod 12 is arranged in the central hole of the piston rod of the principal stress hydraulic cylinder 11, and the power output shaft of the linear perturbation motor 10 is coaxially and fixedly connected to the force transmission rod 12.

[0035] Inside the pressure chamber 2, a two-rigid-one-flexible rock specimen fixture, a shear-type rock specimen fixture or a three-rigid rock specimen fixture is provided.

[0036] When the rock specimen 13 is clamped in the two-rigid-one-flexible rock specimen fixture, a perturbation hole is formed in the interlocking rigid pad 14 of the two-rigid-one-flexible rock specimen fixture, the perturbation hole penetrates through the interlocking rigid pad 14, and a two-rigid-one-flexible rock specimen fixture perturbation rod 15 is coaxially arranged in the perturbation hole. One end of the two-rigid-one-flexible rock specimen fixture perturbation rod 15 is coaxially and fixedly connected to the force transmission rod 12, and the other end of the two-rigid-one-flexible rock specimen fixture perturbation rod 15 is in contact with the rock specimen 13.

[0037] When the rock specimen 13 is clamped in the two-rigid-one-flexible rock specimen fixture, a self-stabilizing loading frame 16 is assembled outside the two-rigid-one-flexible rock specimen fixture, a loading pressure head 17 is arranged outside the interlocking rigid pad 14 of the two-rigid-one-flexible rock specimen fixture, a through-hole 18 is formed in the loading pressure head 17, the through-hole 18 and the perturbation hole on the interlocking rigid pad 14 are coaxially distributed, and the force transmission rod 12 passes through the through-hole 18 and is connected to the two-rigid-one-flexible rock specimen fixture perturbation rod 15.

[0038] When the rock specimen 13 is clamped in the two-rigid-one-flexible rock specimen fixture, a U-shaped deformation measurement bracket 19 is arranged in the direction of the minimum principal stress of the rock specimen 13, and strain gauges are pasted on the surface of the U-shaped cross arm of the U-shaped deformation measurement bracket 19; a force transmission disc 20 is installed between the end of one U-shaped arm of the U-shaped deformation measurement bracket 19 and the rock specimen 13, a disturbance cylinder seat 21 is arranged outside the force transmission disc 20, the disturbance cylinder seat 21 is coaxially distributed with the force transmission disc 20, and the disturbance cylinder seat 21 is coaxially and fixedly connected with the force transmission rod 12.

[0039] When the rock specimen 13 is clamped in the shear-type rock specimen fixture, a disturbance hole is provided in the normal stress direction loading block 22 of the shear-type rock specimen fixture, the disturbance hole penetrates through the normal stress direction loading block 22, a shear-type rock specimen fixture disturbance rod 23 is coaxially arranged in the disturbance hole, one end of the shear-type rock specimen fixture disturbance rod 23 is coaxially and fixedly connected with the force transmission rod 12, and the other end of the shear-type rock specimen fixture disturbance rod 23 is in contact with the rock specimen 13.

[0040] When the rock specimen 13 is clamped in the three-rigid rock specimen fixture, a disturbance hole is provided in the principal stress loading block 24 of the three-rigid rock specimen fixture, the disturbance hole penetrates through the principal stress loading block 24, a three-rigid rock specimen fixture disturbance rod 25 is coaxially arranged in the disturbance hole, one end of the three-rigid rock specimen fixture disturbance rod 25 is coaxially and fixedly connected with the force transmission rod 12, and the other end of the three-rigid rock specimen fixture disturbance rod 25 is in contact with the rock specimen 13.

[0041] The following describes the use process of the present invention with reference to the accompanying drawings:

[0042] In this embodiment, the linear disturbance motor 10 is used as the power disturbance source, and a linear motor with the model of IC44-250 is selected. When the disturbance frequency is 500 Hz, the maximum disturbance stress is 9.62 kN.

[0043] When it is necessary to carry out the true triaxial dynamic disturbance aging test of hard rock under the condition of two-rigid-one-flexible, first clamp the rock specimen 13 into the two-rigid-one-flexible rock specimen fixture, and at the same time complete the installation of the displacement sensors in the directions of the maximum principal stress and the minimum principal stress, as well as the installation of the U-shaped deformation measurement bracket 19 and the strain gauges.

[0044] Install the two-rigid-one-flexible rock specimen fixture with the rock specimen 13 installed therein into the pressure chamber 2 through the self-stabilizing loading frame 16, and then control the cylinder rod of the pressure chamber pull-push driving oil cylinder 9 to retract until the pressure chamber 2 is completely retracted into the central hole of the reaction frame 1, and the pressure chamber 2 is closed.

[0045] First, the main stress hydraulic cylinders 11 of the first major principal stress linear perturbation actuator 3, the second major principal stress linear perturbation actuator 4, the first intermediate principal stress linear perturbation actuator 5, and the second intermediate principal stress linear perturbation actuator 6 are used to complete the centering and pre-clamping of the rock specimen 13. Subsequently, hydraulic oil is injected into the pressure chamber 2 until the confining pressure loading, that is, the loading of the minimum principal stress, is completed. After that, the intermediate principal stress loading and the major principal stress loading of the rock specimen 13 are completed in sequence.

[0046] When the true triaxial loading of the two-rigid-one-flexible type for the rock specimen 13 is completed, according to the test requirements, the six linear perturbation motors 10 can be started separately or simultaneously. The linear perturbation motors 10 then apply the dynamic perturbation to the rock specimen 13 in sequence through the force transfer rod 12 and the two-rigid-one-flexible type rock specimen fixture perturbation rod 15. The perturbation frequency and perturbation stress can be adjusted at any time according to the test requirements until the long-term aging perturbation test is completed.

[0047] When a dynamic perturbation shear aging test on hard rock is to be carried out, first, the rock specimen 13 is clamped into the shear-type rock specimen fixture, and at the same time, the displacement sensors in the normal stress direction and the shear force direction are installed.

[0048] The shear-type rock specimen fixture with the rock specimen 13 clamped is installed into the pressure chamber 2. Then, the piston rod of the pressure chamber pulling and pushing drive oil cylinder 9 is controlled to retract until the pressure chamber 2 is completely retracted into the central hole of the reaction frame 1, and the pressure chamber 2 is closed.

[0049] First, the main stress hydraulic cylinders 11 of the first intermediate principal stress linear perturbation actuator 5 and the second intermediate principal stress linear perturbation actuator 6 are used to complete the centering and pre-clamping of the rock specimen 13 in the normal stress direction. Then, the first major principal stress linear perturbation actuator 3 and the second major principal stress linear perturbation actuator 4 are used to complete the pre-clamping of the rock specimen 13 in the reverse direction of the shear force.

[0050] When the pre-clamping of the rock specimen 13 is completed, according to the test requirements, the normal stress is first applied to the rock specimen 13, then the shear force is applied to the rock specimen 13. Subsequently, the two linear perturbation motors 10 in the normal stress direction are started. The linear perturbation motors 10 then apply the dynamic perturbation to the rock specimen 13 in sequence through the force transfer rod 12 and the shear-type rock specimen fixture perturbation rod 23. The perturbation frequency and perturbation stress can be adjusted at any time according to the test requirements until the long-term aging perturbation test is completed.

[0051] When a dynamic perturbation aging test on hard rock under the condition of three-rigids is to be carried out, first, the rock specimen 13 is clamped into the three-rigid type rock specimen fixture, and at the same time, the displacement sensors in the major principal stress direction, the intermediate principal stress direction, and the minimum principal stress direction are installed.

[0052] Install the three-rigid rock specimen fixture with the rock specimen 13 clamped into the pressure chamber 2. Then, control the rod of the pressure chamber pull-push drive oil cylinder 9 to retract until the pressure chamber 2 is completely retracted into the central hole of the reaction frame 1, and the pressure chamber 2 is sealed.

[0053] Complete the centering and pre-clamping of the rock specimen 13 through the principal stress hydraulic cylinders 11 of the first maximum principal stress linear actuator 3, the second maximum principal stress linear actuator 4, the first intermediate principal stress linear actuator 5, the second intermediate principal stress linear actuator 6, the first minimum principal stress linear actuator 7, and the second minimum principal stress linear actuator 8.

[0054] After the pre-clamping of the rock specimen 13 is completed, first perform the minimum principal stress loading on the rock specimen 13, then perform the intermediate principal stress loading on the rock specimen 13, and then perform the maximum principal stress loading on the rock specimen 13.

[0055] When the true triaxial loading of the three-rigid type on the rock specimen 13 is completed, according to the test requirements, six linear disturbance motors 10 can be started separately or simultaneously. The linear disturbance motors 10 will then apply the dynamic disturbance to the rock specimen 13 through the force transmission rod 12 and the disturbance rod 25 of the three-rigid rock specimen fixture in sequence. The disturbance frequency and disturbance stress can be adjusted at any time according to the test requirements until the long-term aging disturbance test is completed.

[0056] The solutions in the embodiments are not intended to limit the protection scope of the present invention. Any equivalent implementation or modification without departing from the present invention is included in the protection scope of the present invention.

Claims

1. A true triaxial dynamic disturbance aging fracture test device for hard rock in deep engineering, characterized in that: It includes a reaction frame, a pressure chamber, a first major principal stress linear perturbation actuator, a second major principal stress linear perturbation actuator, a first intermediate principal stress linear perturbation actuator, a second intermediate principal stress linear perturbation actuator, a first minor principal stress linear perturbation actuator and a second minor principal stress linear perturbation actuator; the reaction frame adopts a square structure and is vertically arranged; the pressure chamber adopts a hollow cylindrical structure, is horizontally arranged and is inserted into the central hole of the reaction frame; a pressure chamber pulling and driving oil cylinder is fixedly embedded inside the matrix of the reaction frame, the pressure chamber pulling and driving oil cylinder is parallel to the pressure chamber, the cylinder barrel of the pressure chamber pulling and driving oil cylinder is fixedly connected with the matrix of the reaction frame, and the piston rod of the pressure chamber pulling and driving oil cylinder is fixedly connected with the pressure chamber; the first major principal stress linear perturbation actuator and the second major principal stress linear perturbation actuator are mirror-symmetrically distributed at both axial ends of the pressure chamber; the second major principal stress linear perturbation actuator and the first intermediate principal stress linear perturbation actuator are mirror-symmetrically distributed at the upper and lower ends of the reaction frame; the first minor principal stress linear perturbation actuator and the second minor principal stress linear perturbation actuator are mirror-symmetrically distributed at the left and right ends of the reaction frame.

2. The true triaxial dynamic disturbance aging fracture test device for hard rock in deep engineering according to claim 1, characterized in that: The first major principal stress linear perturbation actuator, the second major principal stress linear perturbation actuator, the first intermediate principal stress linear perturbation actuator, the second intermediate principal stress linear perturbation actuator, the first minor principal stress linear perturbation actuator and the second minor principal stress linear perturbation actuator have the same structure and all include a linear perturbation motor and a principal stress hydraulic cylinder; the piston rod of the principal stress hydraulic cylinder is of a hollow rod structure; the inner ends of the cylinder barrels of the first major principal stress linear perturbation actuator and the second major principal stress linear perturbation actuator are fixedly connected with the pressure chamber; the inner ends of the cylinder barrels of the first intermediate principal stress linear perturbation actuator, the second intermediate principal stress linear perturbation actuator, the first minor principal stress linear perturbation actuator and the second minor principal stress linear perturbation actuator are fixedly connected with the reaction frame; the linear perturbation motor is coaxially fixedly installed at the outer end of the cylinder barrel of the principal stress hydraulic cylinder, a force transmission rod is arranged in the central hole of the piston rod of the principal stress hydraulic cylinder, and the power output shaft of the linear perturbation motor is coaxially fixedly connected with the force transmission rod.

3. The true triaxial dynamic disturbance aging fracture test device for hard rock in deep engineering according to claim 2, characterized in that: A two-rigid-one-flexible rock specimen fixture, a shear-type rock specimen fixture or a three-rigid rock specimen fixture is arranged inside the pressure chamber.

4. A true triaxial dynamic disturbance aging fracture test device for hard rock in deep engineering according to claim 3, characterized in that: When the rock specimen is clamped in the two-rigid-one-flexible rock specimen fixture, a perturbation hole is opened on the interlocking rigid pad of the two-rigid-one-flexible rock specimen fixture, the perturbation hole penetrates through the interlocking rigid pad, a two-rigid-one-flexible rock specimen fixture perturbation rod is coaxially arranged in the perturbation hole, one end of the two-rigid-one-flexible rock specimen fixture perturbation rod is coaxially fixedly connected with the force transmission rod, and the other end of the two-rigid-one-flexible rock specimen fixture perturbation rod is in contact with the rock specimen.

5. The true triaxial dynamic disturbance aging fracture test device for hard rock in deep engineering according to claim 4, characterized in that: When a rock specimen is clamped in a two-rigid-one-flexible rock specimen fixture, a self-stabilizing loading frame is assembled outside the two-rigid-one-flexible rock specimen fixture. A loading ram is arranged outside the interlocking rigid pads of the two-rigid-one-flexible rock specimen fixture. A through-hole is formed in the loading ram, and the through-hole and the disturbance hole on the interlocking rigid pad are coaxially distributed. The force transfer rod passes through the through-hole and is connected to the disturbance rod of the two-rigid-one-flexible rock specimen fixture.

6. The true triaxial dynamic disturbance aging fracture test device for hard rock in deep engineering according to claim 3, characterized in that: When a rock specimen is clamped in a two-rigid-one-flexible rock specimen fixture, a U-shaped deformation measurement bracket is arranged in the direction of the minimum principal stress of the rock specimen, and strain gauges are pasted on the surface of the U-shaped cross arm of the U-shaped deformation measurement bracket. A force transfer disc is installed between the end of one U-shaped arm of the U-shaped deformation measurement bracket and the rock specimen. A disturbance cylinder base is arranged outside the force transfer disc, and the disturbance cylinder base and the force transfer disc are coaxially distributed. The disturbance cylinder base is coaxially and fixedly connected to the force transfer rod.

7. The true triaxial dynamic disturbance aging fracture test device for hard rock in deep engineering according to claim 3, wherein: When a rock specimen is clamped in a shear-type rock specimen fixture, a disturbance hole is formed in the normal stress direction loading pad of the shear-type rock specimen fixture, and the disturbance hole penetrates the normal stress direction loading pad. A shear-type rock specimen fixture disturbance rod is coaxially arranged in the disturbance hole. One end of the shear-type rock specimen fixture disturbance rod is coaxially and fixedly connected to the force transfer rod, and the other end of the shear-type rock specimen fixture disturbance rod contacts the rock specimen.

8. The true triaxial dynamic disturbance aging fracture test device for hard rock in deep engineering according to claim 3, characterized in that: When a rock specimen is clamped in a three-rigid rock specimen fixture, a disturbance hole is formed in the principal stress loading pad of the three-rigid rock specimen fixture, and the disturbance hole penetrates the principal stress loading pad. A three-rigid rock specimen fixture disturbance rod is coaxially arranged in the disturbance hole. One end of the three-rigid rock specimen fixture disturbance rod is coaxially and fixedly connected to the force transfer rod, and the other end of the three-rigid rock specimen fixture disturbance rod contacts the rock specimen.

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