Fault stick-slip motion test device considering viscoelasticity of geological environment

Abstract

The application discloses a fault stick-slip motion test device considering the viscoelastic plasticity influence of a geological environment, which comprises a shell, a hydraulic push rod, variable constitutive relation members and stress transmission members in the shell; wherein the clamping plates of the two stress transmission members are opposite to each other, and the space between the two clamping plates is a placement cavity for a compression-shear sample; the transmission arms of the two stress transmission members are connected with four corresponding variable constitutive relation members, including three passive variable constitutive relation members installed and positioned on the shell, and one active variable constitutive relation member installed on the hydraulic push rod, and the adapter plate of the active variable constitutive relation member is installed with a displacement meter at the base of the hydraulic push rod; and the data of the displacement meter is collected and processed by a computer. The test scheme of the device simultaneously considers the active member and the passive member, the active stress and the passive stress loading forms in the fault are clear, and the loading state of the reverse fault in the actual situation is more suitable.

Description

Technical Field

[0001] This invention belongs to the field of geotechnical engineering technology, and in particular relates to a fault stick-slip motion test device that takes into account the influence of the viscoelasticity and plasticity of the geological environment. Background Technology

[0002] Faults (including reverse faults) are formed by the compression of rock strata under high horizontal tectonic stress, causing them to shift and deform. Faults undergo displacement, bending deformation, and accumulate significant elastic energy under the influence of distant plate tectonics. Fault movement generally exhibits two sliding modes: stable creep and unstable stick-slip. These sliding modes alter the stress distribution within the fault, potentially triggering geological disasters such as earthquakes, rockbursts, and rock bursts, resulting in substantial economic losses and casualties. Therefore, research on fault stick-slip movement and stability is of great significance for the simulation and prediction of underground engineering and earthquake hazards.

[0003] Within the Earth's crust, the epicenter of a geological disaster is surrounded by surrounding rock masses. Deformation of the rock mass along the direction of maximum principal stress constitutes a "simulated axial compression system effect," while deformation along the direction of minimum principal stress constitutes a "simulated confining pressure system effect." The stiffness of the axial compression system and the confining pressure system are crucial parameters determining the mechanical environment of the seismic source, collectively referred to as "source environmental stiffness." Given that environmental stiffness is one of the fundamental factors determining stress drop and energy release in geological disasters, it is necessary to simulate the environmental stiffness of the seismic source and explore its impact on fault stick-slip motion.

[0004] In the stick-slip motion of faults, unlike stiffness which stores energy, damping dissipates energy. The damping effect significantly impacts the system's critical friction coefficient and the stress drop at the seismic source. Different geological conditions in nature correspond to different damping ratios for the system. Based on selecting a reasonable system stiffness ratio, adjusting the system damping ratio to study the most favorable damping ratio for stick-slip motion stability will facilitate further research on the stability of the system's stick-slip motion, providing a basis for fault disaster prediction and prevention, and the construction of underground engineering projects.

[0005] In the stick-slip movement of faults, the surrounding rock possesses plastic strength and cannot be loaded indefinitely. When a certain strength is reached, plasticity and creep occur, and this deformation is energy-consuming, reducing the energy released by fault instability. Simultaneously, the plastic deformation of the surrounding rock alters the sliding characteristics of the fault gouge. Therefore, it is necessary to consider the energy-consuming effects of plastic deformation of the surrounding rock and explore its influence on the stick-slip movement of faults. Engineering rock masses are discontinuous bodies containing weak structural planes such as joints and faults. Therefore, simple rheological models cannot fully reflect the mechanical properties of the surrounding rock; multiple simple components need to be combined (in series and parallel) to reflect its mechanical properties and the constitutive equations of the engineering rock mass. Furthermore, under natural conditions, stiffness, damping, and plasticity manifest in two orthogonal directions and two dimensions. Due to the different geological environments and the properties and conditions of the surrounding rock in contact with the hanging wall and footwall at the fault, the stiffness and damping in the corresponding axial and confining pressure directions also differ. Therefore, developing a fault simulation test device with universal applicability to different geological environments will greatly promote related research.

[0006] Existing fault simulation devices have at least the following shortcomings:

[0007] 1. Existing fault simulation devices do not distinguish the influence of the principal force in the direction of tectonic movement and the passive force in the direction of lateral pressure on the fault stick-slip movement. Therefore, existing fault simulation devices cannot meet experimental requirements and cannot simulate the real stress conditions of faults in natural environments.

[0008] 2. Existing fault simulation devices only simulate the local stress field of a fault using pneumatic / hydraulic devices, applying simple uniform stress, gradient stress, or temperature stress to the fault to simulate the "axial compression system" and "confining pressure system" in geological tectonic movements. However, actual engineering faults are affected not only by stress but also by the environmental stiffness surrounding the fault and the viscosity and plasticity of the surrounding rock. Therefore, existing fault simulation devices do not consider the influence of environmental stiffness, viscosity effects, and their coupling effects, thus affecting the experimental results.

[0009] 3. Existing fault simulation devices do not take into account the different properties and conditions of the surrounding rocks in the geological environment in contact with the hanging wall and footwall, nor do they consider that stiffness and damping are reflected in both the axial compression direction and the confining compression direction of the fault, which makes the simulation incomplete.

[0010] 4. Existing fault instability simulation devices only consider using energy-storing springs to describe rockbursts, neglecting the energy dissipation effects of creep and plastic deformation caused by internal rock damping. These effects delay and weaken the rock's instability. Even if the surrounding rock stores a large amount of energy sufficient to cause rockburst instability, the stored energy cannot be fully released or may even be dissipated due to the energy dissipation effect of the surrounding rock itself, reducing the effective energy within the rock and lowering the probability of rockburst. Therefore, existing fault instability simulation devices do not consider the energy dissipation effect of damping.

[0011] Since current fault stick-slip motion simulation devices cannot simulate the actual stress conditions of faults, it is necessary to develop a complete physical model test device to consider the influence of the coupling effects of environmental elasticity, plasticity, viscosity, and loading rate on the fault zone, so as to simulate the actual stress conditions of faults under tectonic motion. Summary of the Invention

[0012] To overcome the shortcomings and deficiencies of the prior art, the purpose of this invention is to provide a fault stick-slip motion test device that takes into account the influence of the viscoelasticity and plasticity of the geological environment.

[0013] The present invention is implemented as follows: a fault stick-slip motion test device that takes into account the influence of viscoelasticity and plasticity of geological environment. The device includes a shell, a hydraulic push rod, a variable constitutive relation component and a stress transmission component located in the shell.

[0014] The variable constitutive relation component includes a transition plate, a transition piece, a contact plate, and a constitutive element. The transition plate and the transition piece are connected to each other and to each other through constitutive elements. The constitutive element is composed of springs, hydraulic damping components, and plastic components connected in series and parallel.

[0015] The stress transmission component includes a primary stress transmission element and a secondary stress transmission element. The primary stress transmission element includes a base and two transmission arms fixed to the base. The ends of the transmission arms away from the base are fixed to a pressure plate. The pressure plate rests against a contact plate, and a displacement gauge is installed between the pressure plate and the transition plate. The secondary stress transmission element includes a clamping plate, one side of which is hinged to the base of the primary stress transmission element.

[0016] The clamping plates of the two stress transmission components are opposite to each other, and the space between the two clamping plates is a placement cavity for the compression-shear specimen. The transmission arms of the two stress transmission components are connected to four variable constitutive relation components, including three passive variable constitutive relation components installed and positioned on the shell, and one active variable constitutive relation component installed on the hydraulic push rod. The adapter plate of the active variable constitutive relation component and the base of the hydraulic push rod are equipped with displacement gauges.

[0017] The data from the displacement gauge is collected and processed by a computer.

[0018] Preferably, the clamping plate of the secondary stress transmission component is provided with an arc-shaped limiting guide rail on the side away from the placement cavity, and the transmission arm of the primary stress transmission component is provided with a screw hole; wherein, the transmission arm is limited on the arc-shaped limiting guide rail by the screw hole and the locking bolt.

[0019] Preferably, the two transmission arms of the primary stress transmission component are respectively set as the vertical Y-axis and the horizontal X-axis.

[0020] Preferably, all stress transmission components and all variable constitutive relation components are located in the same plane, and the pushing direction of the hydraulic push rod is not collinear with the line connecting the base hinge points of the two stress transmission components.

[0021] Preferably, the fault stick-slip motion testing device further includes a passive pressure component, and each passive variable constitutive relation component is mounted on the shell through a passive pressure component; wherein,

[0022] The passive pressurization component includes several passive pressurization bolts, which are installed on the housing through passive pressurization screw holes. The ends of the passive pressurization bolts are set as limiting blocks, and the passive pressurization bolts located inside the housing are provided with locking nuts.

[0023] The adapter plate of the passive variable constitutive relation component is provided with several locking threaded grooves on the side facing the shell.

[0024] The limiting block at the end of the passive pressure bolt is confined in the locking thread groove, and the locking nut is screwed into the locking thread groove to fasten the passive pressure bolt and the adapter plate together.

[0025] Preferably, the clamping plate has a shallow groove on the side facing the placement cavity for limiting the position of the sample.

[0026] Compared with the shortcomings and deficiencies of existing technologies, the present invention has the following beneficial effects:

[0027] (1) The device of the present invention considers the test schemes of both active and passive components, clarifies the loading forms of active and passive stress in the fault, and is more in line with the loading state of reverse faults in reality.

[0028] (2) In the variable constitutive relation component of the device of the present invention, by changing the constitutive relation of the surrounding rock, the influence of the environmental stiffness, viscosity, plasticity effect and their mutual coupling effect on fault slippage of the hanging wall and footwall under different tectonic velocities can be considered.

[0029] (3) Considering the different geological environments and the properties and conditions of the surrounding rocks in contact with the hanging wall and footwall at the fault, the stiffness, damping and plasticity are also different. The device of the present invention realizes the simulation of stiffness, damping and plasticity in the direction of maximum principal stress in both the hanging wall and footwall, and also realizes the simulation of stiffness, damping and plasticity in the direction of minimum principal stress, making the device more universal.

[0030] (4) The friction components, spring components, and damping components of the variable constitutive relation components of the device of the present invention can be combined in various series and parallel combinations under the conditions of symmetry and no bias to simulate different surrounding rock stiffness, viscosity and plasticity properties, and nonlinear energy storage and dissipation mechanical behaviors. Spring components with different Hooke coefficients, damping components with different damping coefficients, and plastic components with different friction coefficients can also be prefabricated to meet the diversification of simulation parameter combinations. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the fault stick-slip motion test device in an embodiment of the present invention;

[0032] Figure 2 yes Figure 1 Enlarged view at point B in the middle;

[0033] Figure 3 yes Figure 1 Enlarged view at point C;

[0034] Figure 4 This is a schematic diagram of the structure of the spring, hydraulic damping and plastic components of the constitutive element in the embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the side structure of the plastic part in an embodiment of the present invention;

[0036] Figure 6 This is a structural schematic diagram of the stress transmission component in an embodiment of the present invention. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0038] like Figures 1-6 As shown, where, Figure 1 This is a schematic diagram of the structure of the fault stick-slip motion test device in an embodiment of the present invention; Figure 2 yes Figure 1 Enlarged view at point B in the middle; Figure 3 yes Figure 1 Enlarged view at point C; Figure 4This is a schematic diagram of the structure of the spring, hydraulic damping and plastic components of the constitutive element in the embodiment of the present invention; Figure 5 This is a schematic diagram of the side structure of the plastic part in an embodiment of the present invention; Figure 6 This is a structural schematic diagram of the stress transmission component in an embodiment of the present invention.

[0039] This invention discloses a fault stick-slip motion testing device considering the viscoelastic and plastic effects of geological environment. The device includes a shell 1, a hydraulic push rod 2, a variable constitutive relation component 3 and a stress transmission component 4 located within the shell 1. The variable constitutive relation component 3 includes a transition plate 3-1, a transition piece 3-2, a contact plate 3-3, and a constitutive element 3-4. The transition plate 3-1 and the transition piece 3-2, as well as the transition piece 3-2 and the contact plate 3-3, are connected by the constitutive element 3-4. The constitutive element 3-4 is composed of series and parallel springs 3-41, hydraulic damping components 3-42, and plastic components 3-43. The stress transmission component 4 includes a primary stress transmission component 4-1 and a secondary stress transmission component 4-2. The primary stress transmission component 4-1 includes a base and two transmission arms 4-11 fixed to the base. The ends of the transmission arms away from the base are fixed to a pressure plate. On 4-12, the pressure plate is fitted and positioned on the contact plate 3-3, and a displacement gauge 5 is installed between the pressure plate and the transition plate 3-1; the secondary stress transmission component 4-2 includes a clamping plate 4-21, one side of which is hinged to the base of the primary stress transmission component 4-1 via a rotating shaft bearing 4-3; wherein, the clamping plates 4-21 of the two stress transmission components 4 are opposite to each other, and the space between the two clamping plates 4-21 is the placement cavity 7 for the compression shear sample 6; among the four variable constitutive relation components 3 connected to the transmission arms of the two stress transmission components 4, there are three passive variable constitutive relation components 3B installed and positioned on the housing 1, and one active variable constitutive relation component 3A installed on the hydraulic push rod 2, and the transition plate 3-1 of the active variable constitutive relation component 3A and the base of the hydraulic push rod 2 are fitted with displacement gauges 5, and the data of the displacement gauges 5 are collected and processed by the computer 10.

[0040] In this embodiment of the invention, in the variable constitutive relation component 3, threaded holes are provided on the side of the adapter plate 3-1 facing the adapter 3-2, on both sides of the adapter 3-2, and on the side of the contact plate 3-3 facing the adapter 3-2. The threaded rods on each component of the constitutive element 3-4 are screwed into the threaded holes for connection. Using a multi-component combination model is currently the main method for theoretically analyzing the constitutive equations of surrounding rock. The model composed of its components is applied in multiple fields (mechanical, seismic, mechanical rheology, etc.). This embodiment of the invention can reflect the complex mechanical model of nonlinear rheology of surrounding rock through the series and parallel connection of components. Currently, hydraulic damping components 3-42 and plastic components 3-43 are commonly used mechanical components. For example, the hydraulic damping spring shock absorber in a motorcycle is a mechanical model (Kelvin body) where hydraulic damping and spring are connected in parallel. The hydraulic spring provides damping, and the spring provides stiffness. The combined characteristic is viscoelastic; the force generated by the hydraulic damping is related to the deformation rate, while the force generated by the spring stiffness is related to the magnitude of deformation. Furthermore, plastic components 3-43 are frequently used in friction-based vibration damping, such as friction plates, which slide when the force on the component exceeds the frictional force. The combination methods of the components of constitutive element 3-4 include the typical Maxwell method (spring and damper in series), the generalized Kelvin method (Kelvin body and spring in series), and the Murayama and Shibata methods (spring, damping component, and plastic component 3-43 connected in parallel). Of course, the composition modes of components are diverse and depend on the research object.

[0041] In the embodiment of the invention, the variable constitutive relation component 3 is first composed of a Kelvin body formed by a spring component 3-41 and a hydraulic damping component 3-42 connected in parallel. Then, the Kelvin body is formed by a Murayama and Shibata body formed by a spring component 3-41, a hydraulic damping component, and a plastic component 3-43 connected in parallel. Finally, the Kelvin body and the Murayama and Shibata bodies are connected in series and parallel to simulate the mechanical characteristics of nonlinear rheological properties of rocks. Among them, the constitutive element 3-4 consists of spring components 3-41 with different stiffnesses and hydraulic damping components 3-42 and plastic components 3-43 with different damping coefficients. The springs of spring components 3-41, the damping of hydraulic damping components 3-42, and the plastic strength of plastic components 3-43 can be changed according to the test requirements. The two steel plates of plastic component 3-43 are connected by high-strength friction bolts and nuts, and the contact surface of the two steel plates has a certain coefficient of friction. High-strength friction bolts are passed through holes in two steel plates and tightened with nuts to apply clamping force and clamp the steel plates. Internal forces are transmitted through friction between the plates. The plastic strength of this component is determined by the preload of the high-strength friction bolts and the coefficient of friction between the two steel plates (e.g., ...). Figure 5 (As shown). In the variable constitutive relation component 3, different constitutive elements 3-4 are connected in series and parallel to simulate the actual state of the surrounding rock. In addition, displacement gauges 5 are installed between the transition plate 3-1 of the variable constitutive relation component 3 and the bearing plate of the first-level stress transmission component 4-1.

[0042] In this embodiment of the invention, a sample 6 is sandwiched between sample placement cavities 7. The sample 6 consists of a rock fragment 6-1 and a fault gouge 6-2 located within the rock fragment 6-1, used to simulate the interaction between the hanging wall and footwall of the fault on the fault gouge 6-2, and to convert the active and passive concentrated forces into a uniformly distributed force acting on the sample 6. Both the hanging wall and footwall simulation components are composed of stress transmission components 4. The stress transmission components 4 consist of a primary stress transmission component 4-1 and a secondary stress transmission component 4-2. From a structural stress perspective, preferably, the two transmission arms of the primary stress transmission component 4-1 are arranged along the vertical Y-axis and the horizontal X-axis, that is, the two transmission arms of the primary stress transmission component 4-1 are preferably arranged in orthogonal directions. A screw hole is provided at the base where the two transmission arms intersect, and the ends are fixed to a pressure plate. The pressure plate should be relatively wide to ensure effective contact with the contact plate 3-3 of the variable constitutive relation component 3 during fault displacement. In this embodiment, the surface of the contact plate 3-3 in contact with the pressure plate is coated with lubricating oil to reduce friction and improve experimental accuracy. Furthermore, one side of the clamping plate 4-21 of the secondary stress conductor 4-2 can be configured as a side plate or reinforcing rib with screw holes. After the screw holes of the clamping plate 4-21 are aligned with the screw holes at the base of the primary stress conductor 4-1, they are connected by bolts to form a hinged relationship. In a further implementation process, in order to make the structural relationship between the primary stress conductor 4-1 and the secondary stress conductor 4-2 more stable and the angle between the transmission arm and the clamping plate 4-21 adjustable, preferably, the clamping plate 4-21 of the secondary stress conductor 4-2 is provided with an arc-shaped limiting guide rail 4-22 on the side away from the placement cavity 7, and the transmission arm of the primary stress conductor 4-1 is provided with screw holes; wherein, the transmission arm is limited on the arc-shaped limiting guide rail by locking bolts 4-4 through its screw holes. In this embodiment of the invention, with the cooperation of the arc-shaped limiting guide rail and the rotating shaft bearing, the secondary stress transmission component 4-2 can be rotated around the transmission arm on the primary stress transmission component 4-1 to adjust the angle, which is used to simulate fault planes with different orientations. Then, the locking bolt on the arc-shaped limiting guide rail is screwed into the screw hole on the transmission arm of the primary stress transmission component 4-1 to lock the angle. In a further implementation process, in order to ensure the stable placement of the sample 6 in the sample placement cavity 7 and to meet the specific needs of the experiment, preferably, the clamping plate 4-21 is provided with a shallow groove 4-23 on the side facing the placement cavity 7 for limiting the sample 6. This shallow groove 4-23 is used to fill the rock fragment 6-1, allowing the fault gouge 6-2 to contact the rock fragment 6-1.

[0043] In this embodiment of the invention, it is readily understood that the device has two stress transmission components 4, corresponding to four transmission arms, each connected to a variable constitutive relation component 3. Therefore, the device has four variable constitutive relation components 3, which are respectively arranged in four directions of the shell 1. To achieve mechanical balance and stability, and to simulate the characteristics of fault stick-slip motion, the forces are orthogonal but staggered and non-parallel. Specifically, each stress transmission component 4 and each variable constitutive relation component 3 is located in the same plane, and the pushing direction of the hydraulic push rod 2 is not collinear with the line connecting the base hinge points of the two stress transmission components 4. Furthermore, one of the variable constitutive relation components 3 is directly acted upon by the hydraulic push rod 2. For ease of explanation, the variable constitutive relation component 3 acted upon by the hydraulic push rod 2 is referred to as the active variable constitutive relation component 3A, and the other three variable constitutive relation components are referred to as the passive variable constitutive relation components 3B. It is readily understood that, in this embodiment of the invention, the main body of the hydraulic push rod 2 is fixed to the housing 1. The end (pressure head) of the hydraulic push rod 2 is provided with a column end (pressure head) connecting plate. This connecting plate can be connected to the adapter plate 3-1 on the active variable constitutive relation component 3A via a screw, preventing the active loading mechanism from detaching from the variable constitutive relation component during the test loading. In addition, the hydraulic push rod 2 is controlled by the computer 10 to adjust the loading speed and to provide feedback on the loading pressure and displacement. This displacement is detected by the displacement gauge 5 between the adapter plate 3-1 of the active variable constitutive relation component 3A and the base of the hydraulic push rod 2. The active variable constitutive relation component 3A transmits force to the passive variable constitutive relation component 3B through the stress transmission component 4 and the sample 6. In the entire force system, the displacement gauges 5 between the active variable constitutive relation component 3A, the passive variable constitutive relation component 3B and the stress transmission component 4, and the displacement gauges 5 between the active variable constitutive relation component 3A and the base of the hydraulic push rod 2 transmit all detected displacement change data to the computer 10. In this embodiment of the invention, the displacement change is the deformation data of each component and sample 6. Based on the stiffness and damping of the variable constitutive relation component 3, the computer 10 can calculate the thickness change and stress change and magnitude of the fault during the compression and shear process.

[0044] In this embodiment of the invention, it is easy to understand that the force transmission components such as the shell 1, stress transmission component 4, variable constitutive relation component 3, and hydraulic push rod 2 have a large number of force levels, and the force transmission components should be robust. Generally speaking, the installation position of the main body of the shell 1 that houses the variable constitutive relation component 3 and the hydraulic push rod 2 should be set as a base. In actual implementation, the force transmission components such as the transition plate 3-1, transition piece 3-2, and contact plate 3-3 in the shell 1, stress transmission component 4, and variable constitutive relation component 3 are cast from high-strength alloy steel and have sufficient rigidity and strength to ignore the influence of the component rigidity on the constitutive relation of the surrounding rock simulated by the series and parallel connection of each component in the test.

[0045] In a further implementation process, to facilitate loading of the sample 6, preferably, in this embodiment of the invention, the fault stick-slip motion testing device further includes a passive pressure component 8, and each passive variable constitutive relation component 3B is mounted on the housing 1 through a passive pressure component 8; wherein, the passive pressure component 8 includes a plurality of passive pressure bolts 8-1, the passive pressure bolts 8-1 are mounted on the housing 1 through passive pressure screw holes 9 of the housing 1, the end of the passive pressure bolt 8-1 is provided with a limiting block 8-2, and the passive pressure bolt 8-1 located in the housing 1 is provided with a locking nut 8-3; the adapter plate 3-1 of the passive variable constitutive relation component 3B is provided with a plurality of locking thread grooves on the side facing the housing 1; the limiting block 8-2 at the end of the passive pressure bolt 8-1 is limited in the locking thread groove, and the locking nut 8-3 is screwed into the locking thread groove to make the passive pressure bolt 8-1 and the adapter plate 3-1 fastened together. In this embodiment of the invention, a passive pressure screw hole 9 is reserved on the housing 1 (base) to load the sample 6. In the passive pressure component 8, a limiting block 8-2 is provided at the tail end of the passive pressure bolt 8-1. The passive pressure bolt 8-1 is screwed into the passive pressure screw hole 9 and passes through the housing 1 and is connected to the adapter plate 3-1 of the passive variable constitutive relation component 3B. The passive pressure bolt 8-1 can be rotated with a hex wrench to move it along the direction of the sample 6, thereby generating passive pressure on the sample 6 by squeezing the passive variable constitutive relation component 3B. When the deformation of the variable constitutive relation member 3 reaches the initial design value, the locking nut 8-3 is tightened to connect the end of the passive pressure bolt 8-1 with the locking thread groove on the adapter plate 3-1 of the passive variable constitutive relation member 3B, preventing the passive pressure bolt 8-1 from disengaging from the variable constitutive relation member 3 during the test loading. When the variable constitutive relation member 3 is preloaded to the initial design value, the passive pressure bolt 8-1 on the passive variable constitutive relation member 3B is locked in place, and the active variable constitutive relation member 3A is loaded in a set loading mode to simulate the reverse motion of a real reverse fault under the force exerted by plate tectonic movement.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fault stick-slip motion testing device considering viscoelasticity of geological environment, characterized in that, The device comprises a shell, a hydraulic push rod, a variable constitutive relation component and a stress transmission component in the shell; The variable constitutive relation component comprises an adapter plate, an adapter, a contact plate and a constitutive element, the adapter plate, the adapter and the contact plate are connected by the constitutive element, and the constitutive element is composed of series and parallel spring elements, hydraulic damping elements and plastic elements; The stress transmission component comprises a primary stress transmission component and a secondary stress transmission component, the primary stress transmission component comprises a base and two transmission arms fixed on the base, the transmission arms are fixed on a pressure bearing plate away from the base, the pressure bearing plate is attached to the contact plate, and a displacement meter is installed between the pressure bearing plate and the adapter plate; the secondary stress transmission component comprises a clamping plate, one side of the clamping plate is hinged to the base of the primary stress transmission component; wherein, The clamping plates of the two stress transmission components are opposite to each other, and the space between the two clamping plates is a placement cavity for a compression-shear sample, among the four variable constitutive relation components corresponding to the transmission arms of the two stress transmission components, there are three passive variable constitutive relation components installed on the shell, and one active variable constitutive relation component installed on the hydraulic push rod, and a displacement meter is installed between the adapter plate of the active variable constitutive relation component and the base of the hydraulic push rod; the data of the displacement meter is collected and processed by a computer.

2. The fault stick-slip motion testing device according to claim 1, wherein The clamping plate of the secondary stress transmission component is provided with an arc-shaped limiting guide rail away from the placement cavity, and the transmission arms of the primary stress transmission component are provided with screw holes; wherein, the transmission arms are limited on the arc-shaped limiting guide rail through the screw holes and locking bolts.

3. The fault stick-slip motion testing device according to claim 1, wherein The two transmission arms of the primary stress transmission component are respectively arranged in vertical Y-axis and horizontal X-axis.

4. The fault stick-slip motion testing device according to claim 1, wherein Each stress transmission component and each variable constitutive relation component are located in the same plane, and the pushing direction of the hydraulic push rod is not collinear with the connecting line of the hinge points of the bases of the two stress transmission components.

5. The fault stick-slip motion test apparatus according to claim 1, wherein The fault stick-slip motion test device further comprises a passive pressurizing component, and each passive variable constitutive relation component is installed on the shell through a passive pressurizing component; wherein, The passive pressurizing component comprises a plurality of passive pressurizing bolts, the passive pressurizing bolts are installed on the shell through passive pressurizing screw holes of the shell, the end portions of the passive pressurizing bolts are provided with limiting blocks, and locking nuts are arranged on the passive pressurizing bolts in the shell; The adapter plate of the passive variable constitutive relation component is provided with a plurality of locking thread grooves on the side close to the shell; The limiting blocks at the end portions of the passive pressurizing bolts are limited in the locking thread grooves, and the locking nuts are screwed into the locking thread grooves to tightly integrate the passive pressurizing bolts and the adapter plate.

6. The fault stick-slip motion test apparatus according to claim 1, wherein The clamping plate is provided with a shallow groove on the side close to the placement cavity for limiting the sample.

Images