Mechanical and seepage coupling multi-scale simulation evaluation device

Abstract

The invention discloses a mechanics and seepage coupling multi-scale simulation evaluation device. Comprising a pressure chamber; the lower plug is arranged above the lower flange and is communicated with the injection interface; the pressing mechanism is arranged right above the pressure chamber, and a plunger rod of the pressing mechanism penetrates through the through hole and extends into the pressure chamber; the upper plug is arranged at the lower end of a plunger rod of the pressing mechanism and is communicated with the discharge interface; the clamping devices are respectively arranged on the upper plug and the lower plug; the radial extensometer is arranged in the middle of the rock sample to be measured; two ends of the axial extensometer are respectively connected with clamping devices arranged on the upper plug and the lower plug; the tail end of the injection pipeline is connected with the injection interface; the starting end of the discharge pipeline is connected with the discharge interface; and a controller. The device has the beneficial effects that the seepage process can be simulated, and the radial deformation and the axial deformation of the to-be-detected rock sample are detected through the radial extensometer and the axial extensometer.

Description

Technical Field

[0001] The present invention relates to the technical field of rock mechanics, and in particular to a multi-scale simulation evaluation device for coupling mechanics and seepage. Background Art

[0002] The rock mechanics and seepage coupling system utilizes an advanced fully digital measurement and control system (DELTA single-axis motion controller imported from the United States) and electro-hydraulic servo technology integrated with a computer. Data acquisition is automatically completed by the computer during the experiment, and data processing and graphing can be performed directly after the experiment. This system precisely and perfectly implements full closed-loop control of test force (stress), deformation (axial strain and radial strain), and displacement (compression rate). Simultaneously, the system automatically controls the entire test process according to the programmed rock test program, displays the test status in real time, and plots stress-strain curves for both uniaxial and triaxial compression deformation of the rock specimen. It measures performance parameters such as compressive strength, Young's modulus, Poisson's ratio, cohesion, and internal friction angle, providing reliable test data for rock mechanics research, as well as the design and construction of projects such as water conservancy and hydropower, railway bridges, petrochemicals, mining tunnels, and high-rise buildings.

[0003] To simulate different formation conditions, it is necessary to dynamically change multiple conditions such as fluid velocity, fluid pH, pressure, and temperature. This process causes unpredictable deformation of the core, while also accurately collecting parameters such as stress, axial strain, and radial strain. Therefore, the fixture for the core sample must be resistant to high pressure, acid and alkali, secure, and have perfect parallelism. Currently, existing fixtures for core samples are simple in structure and cannot accurately capture the full behavior of the fluid in the actual geological environment while fully simulating real underground conditions. Therefore, it is necessary to provide a rock fixture that can meet the requirements of triaxial load-flow coupling experimental testing under different temperature, pressure, and fluid properties. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-scale simulation and evaluation device for coupling mechanics and seepage, which can simulate the seepage process and detect the radial deformation and axial deformation of the rock sample to be tested through a radial extensometer and an axial extensometer, thereby providing reliable experimental data for research in the field of rock mechanics.

[0005] To achieve the above object, the present invention adopts the following technical solutions, including:

[0006] The pressure chamber is composed of an outer peripheral wall, a lower flange, and an upper flange; the lower end of the outer peripheral wall abuts against the lower flange, and the outer periphery of the lower portion of the upper flange matches the inner periphery of the outer peripheral wall; an injection port and a discharge port are provided in parallel on the lower flange; and an axially extending through hole is provided at the center of the upper flange;

[0007] a lower plug, which is arranged above the lower flange and communicated with the injection port, and is used to support the rock sample to be tested and inject the fluid from the injection port into the rock sample to be tested;

[0008] A pressing mechanism is provided directly above the pressure chamber, wherein a plunger rod of the pressing mechanism extends through the through hole into the pressure chamber, and is used to apply pressure to the rock sample to be tested;

[0009] an upper plug, which is arranged at the lower end of the plunger rod of the pressing mechanism and is in communication with the discharge port. The upper plug is moved closer to or away from the lower plug by the drive of the plunger rod, and is used to cooperate with the lower plug to abut against the upper and lower ends of the rock sample to be tested, and to allow the fluid passing through the core sample to be tested to be discharged from the discharge port;

[0010] Clamping devices, which are respectively provided on the upper plug and the lower plug, and are used to clamp the upper end and the lower end of the rock sample to be tested respectively;

[0011] A radial extensometer is provided in the middle of the rock sample to be tested and is used to detect radial deformation of the rock sample to be tested;

[0012] An axial extensometer, the two ends of which are connected to the clamping devices provided on the upper plug and the lower plug respectively, for detecting the axial deformation of the rock sample to be tested;

[0013] an injection pipeline, which is arranged on one side of the pressure chamber, the end of which is connected to the injection interface and is used to inject fluid into the pressure chamber;

[0014] a discharge pipeline, which is arranged on the other side of the pressure chamber, wherein the starting end of the discharge pipeline is connected to the discharge interface and is used to discharge the fluid in the pressure chamber;

[0015] A controller is electrically connected to the radial extensometer and the axial extensometer, and is used to obtain data from the radial extensometer and the axial extensometer and perform analysis and processing.

[0016] Preferably, the injection pipeline is provided with an intermediate fluid tank, a displacement pump, a movable container, a preheater, a first fixed container, a pressure sensor and a safety valve in sequence from the starting end to the end; a regulating pipeline is also provided between the preheater and the first fixed container, and the regulating pipeline is provided with a pressure regulating valve, an outlet valve, a gas mass flow controller and a one-way valve in sequence from the starting end to the end.

[0017] Preferably, the discharge pipeline is provided with a second fixed container and a back pressure valve in sequence from the starting end to the end; the back pressure valve is connected to the automatic back pressure pump and the gas-liquid separator respectively, and the gas-liquid separator is connected to the liquid recovery metering device and the gas recovery metering device respectively; the second fixed container is connected to the vacuum system through a vacuum pipeline.

[0018] Preferably, the liquid recovery metering device includes a collection tank and an electronic balance for weighing; the gas recovery metering device includes a drying tube and a gas mass flow meter; the gas mass flow meter and the electronic balance are electrically connected to the controller respectively.

[0019] Preferably, it also includes:

[0020] A differential pressure sensor is connected to the injection pipeline and the discharge pipeline respectively and is electrically connected to the controller, and is used to detect the pressure difference between the injection pipeline and the discharge pipeline.

[0021] Preferably, the clamping device comprises:

[0022] A fixing ring, the center of which is provided with a circular hole, and an annular limiting groove is provided on the outer periphery of the circular hole on the upper end surface of the fixing ring;

[0023] The outer circumference of the movable ring is adapted to the inner circumference of the circular hole, and a limiting annular block extending outward is provided on the outer circumference of the upper end surface of the movable ring; the limiting annular block is adapted to the limiting annular groove; and three radially arranged follower grooves are uniformly distributed on the movable ring;

[0024] Three clamping blades are evenly distributed along the circumference above the circular hole, and the outer ends of the three clamping blades are hinged to the fixing ring; the outer ends of the clamping blades are provided with insertion holes; and the inner ends of the clamping blades are provided with clamping columns;

[0025] Three follower pins, which pass through the insertion holes and are inserted into the follower slots respectively;

[0026] a fan-shaped slot, which is provided on the side wall of the fixing ring and communicates with the circular hole;

[0027] A fixed handle, the base of which is arranged on the side wall of the fixing ring and located outside the fan-shaped slot;

[0028] A movable handle, the base of which passes through the fan-shaped slot and is connected to the movable ring;

[0029] a tension spring, which is arranged in the fan-shaped slot and has two ends connected to the movable handle and the fixed handle respectively;

[0030] Wherein, a mounting hole for connecting with the axial extensometer is provided on the edge of the fixing ring, and a copper sleeve is provided in the mounting hole.

[0031] Preferably, it also includes:

[0032] a main frame, which is arranged on the periphery of the pressure chamber, and an upper cover plate and a lower cover plate are respectively provided at the upper and lower ends of the main frame;

[0033] A bracket seat is provided below the main frame and is used to support the main frame;

[0034] a pull plate, which is arranged in the main frame and abuts against the lower end surface of the lower flange;

[0035] A lifting hydraulic cylinder is arranged on the bracket seat, and the piston rod of the lifting hydraulic cylinder vertically passes through the lower cover plate and is connected to the pull plate, so as to support the pressure chamber and drive the pressure chamber to rise and fall.

[0036] Preferably, the pressing mechanism includes:

[0037] a flange seat, which is arranged above the upper cover plate;

[0038] An upper oil cylinder is arranged at the upper end of the flange seat, and a piston rod of the upper oil cylinder is connected to the upper end of the plunger rod;

[0039] a second displacement sensor and a force sensor, each of which is connected to the piston rod and electrically connected to the controller, for detecting the stroke and pressure of the piston rod;

[0040] In which, a sealing flange is provided on the inner periphery of the lower end of the upper flange and the outer periphery of the plunger rod, a sealing ring is provided between the inner periphery of the upper end of the upper flange and the outer periphery of the plunger rod, and the annular space between the plunger rod and the upper flange forms a balancing cylinder; a protrusion is provided in the middle of the plunger rod, the outer periphery of the protrusion is adapted to the inner periphery of the through hole of the upper flange, and a first channel for connecting the balancing cylinder above the protrusion and the pressure chamber is provided on the plunger rod; a second channel for connecting the balancing cylinder below the protrusion and the external space of the upper flange is provided on the plunger rod.

[0041] Preferably, it also includes:

[0042] A linear guide rail is vertically arranged on the main frame on one side;

[0043] A slider is slidably arranged on the linear guide rail and connected to the pressure chamber, and is used for axial limiting during the lifting and lowering process of the pressure chamber.

[0044] Preferably, it also includes:

[0045] A flexible heating sleeve is provided on the outer peripheral wall of the pressure chamber and is electrically connected to the controller for heating the pressure chamber.

[0046] The beneficial effects of the present invention are that it can simulate the seepage process and detect the radial deformation and axial deformation of the rock sample to be tested through the radial extensometer and the axial extensometer, thereby providing reliable test data for research in the field of rock mechanics. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a schematic diagram of a multi-scale simulation evaluation device for coupling mechanics and seepage according to the present invention.

[0048] Figure 2 It is a cross-sectional view of the main frame of the present invention.

[0049] Figure 3 It is a cross-sectional view of the pressure chamber in the present invention.

[0050] Figure 4 It is a three-dimensional diagram of the clamping device in the present invention.

[0051] Figure 5 It is a top view of the clamping device in the present invention.

[0052] Figure 6 for Figure 5 AA cross-sectional view.

[0053] Figure 7 It is a top view of the movable ring in the present invention. DETAILED DESCRIPTION

[0054] The invention will be described in further detail below with reference to the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0055] It should be understood that terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or other elements or combinations thereof.

[0056] like Figure 1-7 As shown, a multi-scale simulation evaluation device for coupling mechanics and seepage of the present invention comprises:

[0057] The pressure chamber 110 is composed of an outer peripheral wall 113, a lower flange 111, and an upper flange 112. The lower end of the outer peripheral wall abuts the lower flange 111, and the lower periphery of the upper flange 112 is adapted to the inner periphery of the outer peripheral wall. An injection port 111a and a discharge port 111b are provided in parallel on the lower flange 111. An axial through-hole is provided in the center of the upper flange 112.

[0058] a lower plug 121 disposed above the lower flange 111 and in communication with the injection port 111a, the lower plug 121 being used to support the rock sample 2 to be tested and to inject the fluid from the injection port 111a into the rock sample 2 to be tested;

[0059] A pressing mechanism is provided directly above the pressure chamber 110 , wherein a plunger rod 133 of the pressing mechanism extends through the through hole into the pressure chamber 110 , and is used to apply pressure to the rock sample 2 to be tested;

[0060] An upper plug 122 is provided at the lower end of the plunger rod 133 of the pressing mechanism and is in communication with the discharge port 111b. Driven by the plunger rod 133, the upper plug 122 moves closer to or away from the lower plug 121, and is used to cooperate with the lower plug 121 to abut against the upper and lower ends of the rock sample 2 to be tested, and to allow the fluid passing through the core sample 2 to be discharged from the discharge port 111b.

[0061] Clamping devices 140, which are respectively provided on the upper plug 122 and the lower plug 121, and are used to clamp the upper end and the lower end of the rock sample 2 to be tested;

[0062] A radial extensometer 150 is provided in the middle of the rock sample 2 to be tested, and is used to detect radial deformation of the rock sample 2 to be tested;

[0063] An axial extensometer 160, whose two ends are respectively connected to the clamping devices 140 provided on the upper plug 122 and the lower plug 121, is used to detect the axial deformation of the rock sample 2 to be tested;

[0064] an injection line 200 disposed on one side of the pressure chamber 110 , with the end of the injection line 200 connected to the injection port 111 a for injecting fluid into the pressure chamber 110 ;

[0065] a discharge line 300 disposed on the other side of the pressure chamber 110 , wherein the starting end of the discharge line 300 is connected to the discharge port 111 b and is used to discharge the fluid in the pressure chamber 110 ;

[0066] The controller 400 is electrically connected to the radial extensometer 150 and the axial extensometer 160 , and is used to obtain data from the radial extensometer 150 and the axial extensometer 160 and perform analysis and processing.

[0067] In another embodiment, the injection pipeline 200 is provided with an intermediate fluid tank 211, a displacement pump 212, a movable container 213, a preheater 214, a first fixed container 215, a pressure sensor 216 and a safety valve 217 in sequence from the starting end to the end; a regulating pipeline is also provided between the preheater 214 and the first fixed container 215, and the regulating pipeline is provided with a pressure regulating valve 221, an outlet valve 222, a gas mass flow controller 223 and a one-way valve 224 in sequence from the starting end to the end.

[0068] In another embodiment, the discharge pipeline 300 is provided with a second constant container 311 and a back pressure valve 312 in sequence from the starting end to the end; the back pressure valve 312 is respectively connected to the automatic back pressure pump 313 and the gas-liquid separator 314, and the gas-liquid separator 315 is respectively connected to the liquid recovery metering device and the gas recovery metering device; the second constant container 311 is connected to the vacuum system 319 through a vacuum pipeline.

[0069] In another embodiment, the liquid recovery metering device includes a collection tank 315 and an electronic balance 316 for weighing; the gas recovery metering device includes a drying tube 317 and a gas mass flow meter 318; the gas mass flow meter 318 and the electronic balance 316 are electrically connected to the controller respectively.

[0070] In another embodiment, the system further includes a differential pressure sensor 500 , which is respectively connected to the injection pipeline 200 and the discharge pipeline 300 and is electrically connected to the controller 400 , for detecting the pressure difference between the injection pipeline 200 and the discharge pipeline 300 .

[0071] In another embodiment, the clamping device 140 includes: a fixed ring 141, a circular hole is provided at the center of the fixed ring 141, and a limiting annular groove is provided on the outer periphery of the circular hole on the upper end surface of the fixed ring 141; a movable ring 142, the outer periphery of which is adapted to the inner periphery of the circular hole, and a limiting annular block extending outward is provided on the outer periphery of the upper end surface of the movable ring 142; the limiting annular block is adapted to the limiting annular groove; three radially arranged follower grooves 142a are evenly distributed on the movable ring 142; three clamping blades 143 are evenly distributed along the circumference above the circular hole, and the outer ends of the three clamping blades 143 are hinged to the fixed ring 141; a socket is provided at the outer end of the clamping blade 143; a clamping column 143a is provided at the inner end of the clamping blade 143; as a preferred embodiment, the three clamping blades The outer ends of 143 are hinged to the fixed ring 141 through screws 143b; three follow-up pins 144 are respectively inserted into the follow-up slots 142a through the jacks; a fan-shaped slot 145 is arranged on the side wall of the fixed ring 141 and is connected to the circular hole; a fixed handle 146, a base of which is arranged on the side wall of the fixed ring 141 and is located outside the fan-shaped slot 145; a movable handle 147, a base of which passes through the fan-shaped slot 145 and is connected to the movable ring 142; a tension spring 148 is arranged in the fan-shaped slot 145, and its two ends are respectively connected to the movable handle 147 and the fixed handle 146; wherein, a mounting hole for connecting to the axial extensometer 160 is provided on the edge of the fixed ring 141, and a copper sleeve 149 is provided in the mounting hole.

[0072] In another embodiment, it also includes: a main frame 173, which is arranged on the periphery of the pressure chamber 110, and the upper and lower ends of the main frame 173 are respectively provided with an upper cover plate 174 and a lower cover plate 172; a bracket seat 171, which is arranged below the main frame 173 and is used to support the main frame 173; a pull plate 176, which is arranged in the main frame 173 and abuts against the lower end surface of the lower flange 111; a lifting hydraulic cylinder 175, which is arranged on the bracket seat 171, and the piston rod of the lifting hydraulic cylinder 175 vertically upward passes through the lower cover plate 172 and is connected to the pull plate 176, which is used to support the pressure chamber 110 and drive the pressure chamber 110 to rise and fall.

[0073] In another embodiment, the pressing mechanism includes: a flange seat 131, which is arranged above the upper cover plate 174; an upper oil cylinder 132, which is arranged at the upper end of the flange 131 seat, and the piston rod of the upper oil cylinder 132 is connected to the upper end of the plunger rod 133; a second displacement sensor 134 and a force sensor 135, which are respectively connected to the piston rod and electrically connected to the controller 400 for detecting the stroke and pressure of the piston rod; wherein a sealing flange 136a is provided on the inner periphery of the lower end of the upper flange 112 and the outer periphery of the plunger rod 133, A sealing ring 137 is provided between the inner periphery of the upper end of the upper flange 112 and the outer periphery of the plunger rod 133, and the annular space between the plunger rod 133 and the upper flange 112 forms a balancing cylinder; a protrusion 138 is provided in the middle of the plunger rod 133, and the outer periphery of the protrusion 138 is adapted to the inner periphery of the through hole of the upper flange 112, and a first channel 139a for connecting the balancing cylinder above the protrusion 138 and the pressure chamber 110 is provided on the plunger rod 133; a second channel 139b for connecting the balancing cylinder below the protrusion and the external space of the upper flange 112 is provided on the plunger rod.

[0074] In another embodiment, it also includes: a linear guide rail 178, which is vertically arranged on the main frame 173 on one side; a slider 179, which is slidably arranged on the linear guide rail 178 and connected to the pressure chamber 110, for axial limitation during the lifting and lowering process of the pressure chamber 110.

[0075] In another embodiment, the system further includes: a flexible heating sleeve 180 , which is disposed on the outer peripheral wall of the pressure chamber 110 and is electrically connected to the controller 400 for heating the pressure chamber 110 .

[0076] During use, the rock sample 2 to be tested is fixed between the upper plug 122 and the lower plug 121 by the clamping device 140, and the fluid is injected into the rock sample 2 to be tested through the injection pipeline 200 and flows out through the discharge pipeline 300. Pressure is applied to the rock sample 2 to be tested by the downward pressure mechanism to simulate the seepage process. During the experiment, the radial deformation and axial deformation of the rock sample 2 to be tested are detected by the radial extensometer 150 and the axial extensometer 160.

[0077] In summary, the present invention provides a multi-scale simulation and evaluation device for coupling mechanics and seepage, which can simulate the seepage process and detect the radial deformation and axial deformation of the rock sample to be tested through radial extensometer and axial extensometer, providing reliable experimental data for research in the field of rock mechanics.

[0078] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A multi-scale simulation evaluation device for coupling mechanics and seepage, characterized in that: include: The pressure chamber is composed of an outer peripheral wall, a lower flange, and an upper flange; the lower end of the outer peripheral wall abuts against the lower flange, and the outer periphery of the lower portion of the upper flange matches the inner periphery of the outer peripheral wall; an injection port and a discharge port are provided in parallel on the lower flange; and an axially extending through hole is provided at the center of the upper flange; a lower plug, which is arranged above the lower flange and communicated with the injection port, and is used to support the rock sample to be tested and inject the fluid from the injection port into the rock sample to be tested; A pressing mechanism is provided directly above the pressure chamber, wherein a plunger rod of the pressing mechanism extends through the through hole into the pressure chamber, and is used to apply pressure to the rock sample to be tested; an upper plug, which is arranged at the lower end of the plunger rod of the pressing mechanism and is in communication with the discharge port. The upper plug is moved closer to or away from the lower plug by the drive of the plunger rod, and is used to cooperate with the lower plug to abut against the upper and lower ends of the rock sample to be tested, and to allow the fluid passing through the core sample to be tested to be discharged from the discharge port; Clamping devices, which are respectively provided on the upper plug and the lower plug, and are used to clamp the upper end and the lower end of the rock sample to be tested respectively; A radial extensometer is provided in the middle of the rock sample to be tested and is used to detect radial deformation of the rock sample to be tested; An axial extensometer, the two ends of which are connected to the clamping devices provided on the upper plug and the lower plug respectively, for detecting the axial deformation of the rock sample to be tested; an injection pipeline, which is arranged on one side of the pressure chamber, the end of which is connected to the injection interface and is used to inject fluid into the pressure chamber; a discharge pipeline, which is arranged on the other side of the pressure chamber, wherein the starting end of the discharge pipeline is connected to the discharge interface and is used to discharge the fluid in the pressure chamber; A controller is electrically connected to the radial extensometer and the axial extensometer, and is used to obtain data from the radial extensometer and the axial extensometer and perform analysis and processing.

2. The multi-scale simulation evaluation device for coupling mechanics and seepage according to claim 1, characterized in that: The injection pipeline is provided with an intermediate fluid tank, a displacement pump, a movable container, a preheater, a first fixed container, a pressure sensor and a safety valve in sequence from the starting end to the end; a regulating pipeline is also provided between the preheater and the first fixed container, and the regulating pipeline is provided with a pressure regulating valve, an outlet valve, a gas mass flow controller and a one-way valve in sequence from the starting end to the end.

3. The multi-scale simulation evaluation device for coupling mechanics and seepage according to claim 2, characterized in that: The discharge pipeline is provided with a second fixed container and a back pressure valve in sequence from the starting end to the end; the back pressure valve is connected to the automatic back pressure pump and the gas-liquid separator respectively, and the gas-liquid separator is connected to the liquid recovery metering device and the gas recovery metering device respectively; the second fixed container is connected to the vacuum system through a vacuum pipeline.

4. The multi-scale simulation evaluation device for coupling mechanics and seepage according to claim 3, characterized in that: The liquid recovery metering device includes a collection tank and an electronic balance for weighing; the gas recovery metering device includes a drying tube and a gas mass flow meter; the gas mass flow meter and the electronic balance are electrically connected to the controller respectively.

5. The multi-scale simulation evaluation device for coupling mechanics and seepage according to claim 3, characterized in that: Also includes: A differential pressure sensor is connected to the injection pipeline and the discharge pipeline respectively and is electrically connected to the controller, and is used to detect the pressure difference between the injection pipeline and the discharge pipeline.

6. The multi-scale simulation evaluation device for coupling mechanics and seepage according to claim 1, characterized in that: The clamping device comprises: A fixing ring, the center of which is provided with a circular hole, and an annular limiting groove is provided on the outer periphery of the circular hole on the upper end surface of the fixing ring; The outer circumference of the movable ring is adapted to the inner circumference of the circular hole, and a limiting annular block extending outward is provided on the outer circumference of the upper end surface of the movable ring; the limiting annular block is adapted to the limiting annular groove; and three radially arranged follower grooves are uniformly distributed on the movable ring; Three clamping blades are evenly distributed along the circumference above the circular hole, and the outer ends of the three clamping blades are hinged to the fixing ring; the outer ends of the clamping blades are provided with insertion holes; and the inner ends of the clamping blades are provided with clamping columns; Three follower pins, which pass through the insertion holes and are inserted into the follower slots respectively; a fan-shaped slot, which is provided on the side wall of the fixing ring and communicates with the circular hole; A fixed handle, the base of which is arranged on the side wall of the fixing ring and located outside the fan-shaped slot; A movable handle, the base of which passes through the fan-shaped slot and is connected to the movable ring; a tension spring, which is arranged in the fan-shaped slot and has two ends connected to the movable handle and the fixed handle respectively; Wherein, a mounting hole for connecting with the axial extensometer is provided on the edge of the fixing ring, and a copper sleeve is provided in the mounting hole.

7. The multi-scale simulation evaluation device for coupling mechanics and seepage according to claim 1, characterized in that: Also includes: a main frame, which is arranged on the periphery of the pressure chamber, and an upper cover plate and a lower cover plate are respectively provided at the upper and lower ends of the main frame; A bracket seat, which is arranged below the main frame and is used to support the main frame; a pull plate, which is arranged in the main frame and abuts against the lower end surface of the lower flange; A lifting hydraulic cylinder is arranged on the bracket seat, and the piston rod of the lifting hydraulic cylinder vertically passes through the lower cover plate and is connected to the pull plate, so as to support the pressure chamber and drive the pressure chamber to rise and fall.

8. The multi-scale simulation evaluation device for coupling mechanics and seepage according to claim 7, characterized in that: The pressing mechanism comprises: a flange seat, which is arranged above the upper cover plate; An upper oil cylinder is arranged at the upper end of the flange seat, and a piston rod of the upper oil cylinder is connected to the upper end of the plunger rod; a second displacement sensor and a force sensor, each of which is connected to the piston rod and electrically connected to the controller, for detecting the stroke and pressure of the piston rod; In which, a sealing flange is provided on the inner periphery of the lower end of the upper flange and the outer periphery of the plunger rod, a sealing ring is provided between the inner periphery of the upper end of the upper flange and the outer periphery of the plunger rod, and the annular space between the plunger rod and the upper flange forms a balancing cylinder; a protrusion is provided in the middle of the plunger rod, the outer periphery of the protrusion is adapted to the inner periphery of the through hole of the upper flange, and a first channel for connecting the balancing cylinder above the protrusion and the pressure chamber is provided on the plunger rod; a second channel for connecting the balancing cylinder below the protrusion and the external space of the upper flange is provided on the plunger rod.

9. The multi-scale simulation evaluation device for coupling mechanics and seepage according to claim 7, characterized in that: Also includes: A linear guide rail is vertically arranged on the main frame on one side; A slider is slidably arranged on the linear guide rail and connected to the pressure chamber, and is used for axial limiting during the lifting and lowering process of the pressure chamber.

10. The multi-scale simulation evaluation device for coupling mechanics and seepage according to claim 1, characterized in that: Also includes: A flexible heating sleeve is provided on the outer peripheral wall of the pressure chamber and is electrically connected to the controller for heating the pressure chamber.

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