Fractured rock mass stress-seepage coupling test device capable of being used for real-time CT (Computed Tomography)

Abstract

The invention belongs to the technical field of geotechnical engineering test technologies and equipment, and particularly relates to a fractured rock mass stress-seepage coupling test device capable of being used for real-time CT (Computed Tomography), comprising: a seepage test module for placing a fractured rock mass sample; the water pressure testing module is used for providing water head pressure of the fractured rock mass sample in the seepage process; the stress test module is used for providing pressure of the fractured rock mass sample in the seepage process; the CT detection module is used for monitoring the change of the fractured rock mass sample in the seepage process in real time; the analyzing and recording module is used for recording the flow and water pressure parameters of the fractured rock mass sample in the seepage process in real time. According to the invention, a broken rock stress-seepage test can be carried out in a limited space of the seepage test module, and characteristic parameters such as compactness, permeability and porosity and a CT picture of a broken rock mass under a stress-seepage coupling effect can be obtained by combining the CT detection module; the result can be used for three-dimensional reconstruction and quantitative characterization of fractured rock mass space.

Description

Technical Field

[0001] The invention relates to a crushed rock mass stress-seepage coupling test device for real-time CT observation, belonging to the technical field of geotechnical engineering test technology and equipment. Background Art

[0002] With the shortage of energy, the improvement of environmental protection awareness and the continuous pursuit of sustainable development goals, the exploration and effective utilization of low-grade geothermal energy in abandoned / closed mines has become an international research hotspot. Compared with the development of traditional geothermal energy, which is limited by specific geological conditions (such as geothermal gradients, volcanic or hydrothermal activity areas), this new type of geothermal resource has significant advantages: first, it breaks through the geographical limitations of geothermal site selection and realizes the wide applicability of resources by utilizing the low-grade thermal energy contained in mine water; second, it greatly reduces the drilling cost in the geothermal mining process and improves economic feasibility; third, through the secondary use of mine water, it effectively reduces environmental pollution and promotes the recycling and protection of water resources.

[0003] In view of the above background, a new solution was proposed to transform the broken rock reservoir in the goaf of abandoned / closed mines into a geothermal reservoir. This solution not only simplifies the installation and deployment process of geothermal system equipment, but also makes full use of the unique hydraulic connectivity and structural stability of the rock reservoir in the goaf, forming an ideal geothermal carrier with high porosity and large heat exchange specific surface area.

[0004] However, the complexity and concealment of the broken rock reservoir in the goaf area poses a huge challenge to accurately assessing its reservoir capacity and deeply studying the dynamic mechanical behavior and temporal and spatial evolution mechanism under the interaction of stress field and seepage field. To this end, the present invention is committed to developing a high-precision, low-cost real-time observation system, which aims to accurately simulate and monitor the mechanical response and internal structure evolution process of broken rock mass under stress-seepage coupling in a laboratory environment. Summary of the invention

[0005] The purpose of the present invention is to provide a crushed rock mass stress-seepage coupling test device which can be used for real-time CT to solve the above problems.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A stress-seepage coupling test device for broken rock mass that can be used for real-time CT, comprising:

[0008] Seepage test module, used to place broken rock samples;

[0009] A water pressure test module, used to provide the water head pressure of the broken rock sample during the seepage process;

[0010] A stress testing module, used for providing the pressure of the broken rock sample during the seepage process;

[0011] A CT detection module, used for real-time monitoring of changes in the broken rock sample during the seepage process;

[0012] The analysis and recording module is used to record in real time the flow rate and water pressure parameters of the broken rock sample during the seepage process.

[0013] Preferably, the seepage test module comprises a pressure chamber, which is fixed to a base by bolts, a water inlet of the base is connected to the bottom of the pressure chamber, a water outlet of the base is connected to a water inlet of a second flow meter, and a water outlet of the second flow meter is connected to a water inlet of a third water pipe;

[0014] The second flow meter is electrically connected to the analysis and recording module;

[0015] The stress testing module is arranged above the pressure chamber;

[0016] The crushed rock sample is placed in the pressure chamber, and water-permeable plates are provided on the top and bottom of the crushed rock sample.

[0017] Preferably, the stress testing module includes a limiter, which is fixedly connected to the top of the pressure chamber through a support rod, a pressure-applying part is provided on the top of the limiter, a load-sensing part is provided on the movable end of the pressure-applying part, a piston is provided on the bottom end of the load-sensing part, the piston is a hollow structure, one side of the piston is connected to the liquid outlet end of the water pressure testing module, the piston is vertically slidably arranged in the pressure chamber, and the bottom of the piston is in contact with and connected to the water-permeable plate located at the top of the pressure chamber.

[0018] Preferably, the pressure-applying part includes a pressure device, a fixed end of the pressure device is fixedly connected to a fixed end of a planetary reducer, the fixed end of the planetary reducer is fixedly connected to the top of the limiter, the output shaft of the pressure device is connected to the output shaft of the planetary reducer, and the output shaft of the planetary reducer is connected to the load sensing part.

[0019] Preferably, the load sensing part includes a load sensor, the top of the load sensor is connected to the output shaft of the planetary reducer, and the bottom of the load sensor is connected to the top of the piston. The load sensor is used to detect the compressive stress applied to the top of the piston by the output shaft of the planetary reducer, and the load sensor is electrically connected to the analysis and recording module.

[0020] Preferably, the water pressure test module comprises a water tank, the water outlet at the bottom of the water tank is connected to one side of the top of the piston through a second water pipe, a flow meter is provided in the middle of the second water pipe, a second pressure gauge is provided at the top of the water tank, and the second pressure gauge is electrically connected to the flow meter and the analysis and recording module;

[0021] The water inlet end of the water tank is connected with a water pressure supply part.

[0022] Preferably, the water pressure supply unit comprises an air compressor, the air compressor is connected to the liquid inlet end of the water tank through a first water pipe, and a first pressure gauge is provided on the top of the air compressor.

[0023] Preferably, the CT detection module comprises an X-ray source and an imaging acquisition system, and the X-ray source and the imaging acquisition system are respectively arranged on two sides of the pressure chamber.

[0024] Preferably, the analysis and recording module includes a paperless recorder, and the paperless recorder is electrically connected to the first pressure gauge, the second pressure gauge, the flow meter, the second flow meter, and the load sensor.

[0025] Compared with the prior art, the present invention has the following advantages and technical effects:

[0026] When in use, the broken rock sample is placed in the seepage test module, and compressive stress and head pressure are applied to the broken rock sample in the seepage test module through the hydraulic test module and the stress test module, and the pressure value is recorded through the analysis and recording module. The changes of the broken rock sample in the seepage process are monitored in real time through the CT detection module. The test device can perform a broken rock stress-seepage test in the limited space of the seepage test module, and obtain characteristic parameters such as compactness, permeability and porosity of the broken rock under the stress-seepage coupling. At the same time, combined with the CT detection module, real-time CT images during the test can be obtained, and the results can be used for three-dimensional reconstruction and quantitative characterization of the broken rock space. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the structures of the seepage test module, the water pressure test module and the stress test module of the present invention;

[0030] Figure 3 It is a layout diagram of the X-ray source and imaging acquisition system of the present invention;

[0031] Figure 4 This is a schematic diagram of the base structure of the present invention;

[0032] Figure 5 This is a schematic diagram of the cross-sectional structure of the base of the present invention;

[0033] Figure 6 It is a schematic diagram of the pressure chamber structure of the present invention;

[0034] Figure 7 It is a schematic diagram of the structure of the solid disc of the present invention;

[0035] Figure 8 It is a schematic diagram of the support rod structure of the present invention;

[0036] Fig. 9 This is a schematic diagram of the installation position of the water-permeable plate and the pressure chamber of the present invention;

[0037] Fig.10 It is a schematic diagram of the structure of the water-permeable plate of the present invention;

[0038] Fig.11 This is a schematic diagram of the piston structure of the present invention;

[0039] Fig.12 This is a schematic diagram of the cross-sectional structure of the piston of the present invention;

[0040] Fig.13 It is a schematic diagram of the structure of the load sensor of the present invention;

[0041] Fig.14 This is a schematic diagram of the structure of the stress test module of the present invention;

[0042] Among them, 1. air compressor; 2. first pressure gauge; 3. first water pipe; 4. water tank; 5. second pressure gauge; 6. flow meter; 7. second water pipe; 8. pressure device; 9. planetary reducer; 10. limiter; 11. load sensor; 12. piston; 13. pressure chamber; 14. base; 15. bolt; 16. second flow meter; 17. third water pipe; 18. X-ray source; 19. imaging acquisition system; 20. permeable plate; 21. support rod. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] Reference Figures 1 to 11 The present invention discloses a stress-seepage coupling test device for a broken rock mass that can be used for real-time CT, comprising:

[0046] Seepage test module, used to place broken rock samples;

[0047] Water pressure test module, used to provide the water head pressure of the broken rock sample during the seepage process;

[0048] Stress test module, used to provide the pressure of the broken rock sample during the seepage process;

[0049] CT detection module, used to monitor the changes of broken rock samples during seepage in real time;

[0050] The analysis and recording module is used to record the flow and water pressure parameters of the broken rock sample in the seepage process in real time.

[0051] When in use, the broken rock sample is placed in the seepage test module, and compressive stress and head pressure are applied to the broken rock sample in the seepage test module through the hydraulic test module and the stress test module, and the pressure value is recorded through the analysis and recording module. The changes of the broken rock sample in the seepage process are monitored in real time through the CT detection module. The test device can perform a broken rock stress-seepage test in the limited space of the seepage test module, and obtain characteristic parameters such as compactness, permeability and porosity of the broken rock under the stress-seepage coupling. At the same time, combined with the CT detection module, real-time CT images during the test can be obtained, and the results can be used for three-dimensional reconstruction and quantitative characterization of the broken rock space.

[0052] The seepage test module is designed for placing and fixing broken rock samples, ensuring that the samples are in a stable state during the test, while allowing the fluid to seep freely inside the samples, providing a basic platform for in-depth research on seepage characteristics.

[0053] The water pressure test module integrates advanced pressure generation and regulation technology, which can accurately apply and adjust the head pressure required for broken rock samples during the seepage process to simulate the water pressure conditions in different geological environments and improve the authenticity and reliability of the test.

[0054] The stress loading module uses a high-precision stress loading device, which can apply multi-directional or unidirectional pressure to the broken rock samples, simulate the complex stress state in actual engineering, and provide necessary conditions for analyzing the stress-seepage coupling effect.

[0055] The CT detection module integrates high-performance CT scanning equipment, which can monitor key parameters such as internal structure changes, crack expansion and seepage path evolution of broken rock samples in real time and non-destructively during the test, providing intuitive and accurate image data for in-depth research on stress-seepage coupling mechanism.

[0056] The analysis and recording module integrates data acquisition, processing and analysis functions. It can automatically record and analyze in real time the changes in key parameters such as flow rate and water pressure of broken rock samples during the seepage process. At the same time, combined with CT scanning results, it can realize data visualization and in-depth mining, providing strong data support for scientific research and engineering design.

[0057] Further optimizing the scheme, the seepage test module includes a pressure chamber 13, the pressure chamber 13 is fixed to the base 14 by bolts 15, the water inlet end of the base 14 is connected to the bottom of the pressure chamber 13, the water outlet end of the base 14 is connected to the water inlet end of the second flow meter 16, and the water outlet end of the second flow meter 16 is connected to the water inlet end of the third water pipe 17;

[0058] The second flow meter 16 is electrically connected to the analysis and recording module;

[0059] The stress testing module is arranged above the pressure chamber 13;

[0060] The crushed rock sample is placed in the pressure chamber 13, and water-permeable plates 20 are provided on the top and bottom of the crushed rock sample.

[0061] The base 14 is made of POM material, which consists of two solid discs and a central tube. The two solid discs are welded and fixed. Six circular bolt holes penetrate the upper and lower surfaces of the first disc. A flow channel is provided in the first disc. One end of the flow channel is connected to the bottom of the pressure chamber 13, and the other end of the flow channel is connected to the third water pipe 17.

[0062] The pressure chamber 13 is made of POM material, with two solid discs at the top and bottom and a central chamber in the middle for storing rocks. The two solid discs are welded and fixed at both ends of the central chamber. The central chamber is a tubular structure. The solid disc at the bottom of the pressure chamber 13 and the solid disc at the top of the base are fixed at the bolt holes by six bolts. The solid disc at the top of the pressure chamber 13 is used to connect with the stress testing module.

[0063] The solid disc is made of POM material, solid, and has bolt holes set according to actual needs.

[0064] There are two permeable plates 20, both made of POM material, which serve as the bearing device for the compression test and as the water inlet and outlet for the seepage test. The diameter is slightly smaller than the diameter of the pressure chamber 13, which is convenient for putting in and taking out. During assembly, the lower end is flush with the lower end of the pressure chamber 13, and then gravel is placed in the pressure chamber 13. After placement, the upper permeable plate 20 is covered. After the stress-seepage test begins, the piston 12 squeezes downward to push the permeable plate 20 downward to achieve the purpose of compressing the gravel.

[0065] A further optimized solution is that the stress testing module includes a limiter 10, which is fixedly connected to the top of the pressure chamber 13 through a support rod 21. A pressure-applying part is provided on the top of the limiter 10, and a load-sensing part is provided at the movable end of the pressure-applying part. A piston 12 is provided at the bottom end of the load-sensing part. The piston 12 is a hollow structure, and one side of the piston 12 is connected to the liquid outlet end of the water pressure testing module. The piston 12 is vertically slidably arranged in the pressure chamber 13, and the bottom of the piston 12 is in contact with and connected to a water-permeable plate 20 located at the top of the pressure chamber 13.

[0066] A further optimized solution is that the pressure-applying part includes a pressure device 8, a fixed end of the pressure device 8 is fixedly connected to a fixed end of a planetary reducer 9, a fixed end of the planetary reducer 9 is fixedly connected to the top of the limiter 10, an output shaft of the pressure device 8 is connected to an output shaft of the planetary reducer 9, and an output shaft of the planetary reducer 9 is connected to a load sensing part.

[0067] A further optimized solution is that the load sensing part includes a load sensor 11, the top of the load sensor 11 is connected to the output shaft of the planetary reducer 9, and the bottom of the load sensor 11 is connected to the top of the piston 12. The load sensor 11 is used to detect the compressive stress applied to the top of the piston 12 by the output shaft of the planetary reducer 9, and the load sensor 11 is electrically connected to the analysis and recording module.

[0068] Another solid disc is connected to the solid disc above the pressure chamber 13 by bolts, the bottom end of the support rod 21 is fixed to the solid disc, the top end of the support rod 21 is fixed to another solid disc, and the support rod 21 is provided with multiple solid discs, which are arranged at equal intervals in the circumferential direction between the two solid discs. The solid disc located at the top of the support rod 21 is used to fix the limiter 10.

[0069] The load sensor 11 is formed by five solid discs, all made of POM material and welded to each other. During the test, the solid disc at the lower end of the load sensor 11 contacts the top of the piston 12, and when the load is transmitted from top to bottom, the piston 12 is pushed downward.

[0070] The pressure device 8 is used to control the size of the applied pressure; the planetary reducer 9 is used to control the speed of pressure transmission to prevent excessive pressure; the limiter 10 is used to control the displacement to control the crushed rock to be compressed to a specified displacement. The lower end of the limiter 10 is welded and fixed to the upper end of the load sensor 11.

[0071] The piston 12 is made of POM material, solid, with a circular hole punched from the bottom center to the water head position below the top of the piston 12. The water outlet of the second water pipe 7 is connected to one side of the top of the circular hole, serving as the water inlet for the seepage test. During the test, the lower end of the piston 12 pushes the water-permeable plate 20 on the top of the pressure chamber 13.

[0072] Further optimizing the scheme, the water pressure test module includes a water tank 4, the water outlet at the bottom of the water tank 4 is connected to one side of the top of the piston 12 through a second water pipe 7, the middle of the second water pipe 7 is connected to a flow meter 6, the top of the water tank 4 is connected to a second pressure gauge 5, and the second pressure gauge 5 and the flow meter 6 are electrically connected to the analysis and recording module;

[0073] The water inlet end of the water tank 4 is connected to a water pressure supply part.

[0074] According to a further optimized solution, the water pressure supply unit includes an air compressor 1 , which is connected to a liquid inlet end of a water tank 4 through a first water pipe 3 , and a first pressure gauge 2 is provided at the top of the air compressor 1 .

[0075] Air pressure is provided to the water tank 4 by the air compressor 1, and the air pressure pushes the water in the water tank 4 to flow into the piston 12 at the set water pressure, and then flows to the water-permeable plate 20 at the top of the pressure chamber 13 through the central circular hole of the piston 12, and penetrates into the broken rock sample. Finally, the water flows from the water-permeable plate 20 at the bottom of the pressure chamber 13 to the flow channel in the base 14 and is discharged through the third water pipe 17.

[0076] According to a further optimized solution, the CT detection module includes an X-ray source 18 and an imaging acquisition system 19 , and the X-ray source 18 and the imaging acquisition system 19 are respectively arranged on two sides of the pressure chamber 13 .

[0077] To further optimize the solution, the analysis and recording module includes a paperless recorder, which is electrically connected to the first pressure gauge 2 , the second pressure gauge 5 , the flow meter 6 , the second flow meter 16 , and the load sensor 11 .

[0078] Device assembly and structure description:

[0079] 1) Connect the base 14 to the pressure chamber 13, and fix the two by six hexagonal bolts 15. The water outlet on the base 14 is connected to the third water pipe 17 as the water outlet of the seepage test.

[0080] 2) Connect the pressure chamber 13 to a steel disc of the same size and secure it with the other six hexagonal bolts 15 .

[0081] 3) Connect the steel disc to the piston 12, install a second water pipe 7 at the water head position of the piston 12, the second water pipe 7 is connected to the water tank 4, the water tank 4 is connected to the air compressor 1 to provide the required water pressure, a second pressure gauge 5 is installed on the water tank 4, and a flow meter 6 is installed on the second water pipe 7 to detect flow and water pressure parameters.

[0082] 4) The upper end of the piston 12 is connected to the load sensor 11 to receive the pressure applied by the pressure device 8.

[0083] 5) An X-ray source 18 and an imaging acquisition system 19 are set up on both sides of the stress-seepage device to take real-time photos of the stress-seepage test of the broken rock.

[0084] Test steps and methods:

[0085] 1. Turn off all switches of the system, put the crushed rock into the pressure chamber 13, fix it with six hexagonal bolts 15, connect all the seepage inlets and outlets with pipelines, and start the computer system controlling the pressure device 8.

[0086] 2. Turn on the power of the air compressor 1 and observe the internal pressure with the first pressure gauge 2. When the internal pressure of the air compressor 1 reaches the preset water pressure, open the inlet switch of the water tank 4.

[0087] 3. While opening the inlet switch of the water tank 4, control the pressure device 8 to achieve the purpose of specifying the compression displacement.

[0088] 4. Observe the internal pressure by the second pressure gauge 5. When the internal pressure of the water tank 4 reaches the preset water pressure, open the outlet switch of the water tank 4.

[0089] 5. Open the water outlet switch of the second water pipe 7 and the water outlet switch of the third water pipe 17 on the piston 12 to carry out the seepage erosion test, and at the same time turn on the X-ray source 18 and the imaging acquisition system 19 to take real-time photos of the stress-seepage erosion of the broken rock.

[0090] Broken rock structure analysis method based on CT images:

[0091] Through real-time CT scanning, we can further obtain the changes in porosity, permeability, and fractal dimension after the stress-seepage coupling test of the broken rock mass. Porosity and permeability are closely related to the rock structure itself and are important parameters for describing the connectivity of pores inside the rock; fractal dimension is the most important parameter for describing fractals and reflects the spatial occupancy of complex shapes. The calculation formulas for porosity, permeability, and fractal dimension are as follows:

[0092]

[0093] In the formula, V0 represents the pore volume, V represents the volume of broken rock mass; S0 represents the pore area of ​​each layer, S represents the area of ​​each broken rock mass,

[0094]

[0095] Where, Q is the flow rate of the permeating fluid (μm3 / s); μ is the viscosity of the fluid (Pa·s), and the viscosity of water at room temperature is 0.001Pa·s; L is the length of the seepage channel (μm); A is the fluid outlet area (μm2); P is the inlet and outlet pressure difference (Pa)

[0096] Fractal dimension is the most important parameter to describe fractals, among which the box dimension has a clear physical meaning and is widely used. This study uses the box dimension, that is, the three-dimensional pore model of the rock sample is placed in a number of cubes with a grid side length of X. The number of grids containing pores or cracks in the cube is P(X). The slope of the regression line is obtained by using the double logarithmic coordinate pair P(X) and X, which is the fractal dimension corresponding to the grid side length ε as shown in the following formula:

[0097]

[0098] The following is the calculation method of porosity and fractal dimension of broken rock mass based on CT data:

[0099] (1) Obtaining CT scanning image data: Using the X-ray source 18 and the imaging acquisition system 19, a real-time CT image of the stress-seepage coupling test of the broken rock mass is obtained, including pores and rock block parts.

[0100] (2) Image processing: The images obtained by CT scanning were imported into the 3D visualization software Avizo. The noise points at the edge of the image were removed by the median filter method. In order to ensure the accuracy of threshold segmentation, the Boolean operation segmentation method was used to separate the pores and blocks.

[0101] (3) Calculation of porosity and fractal dimension: Use the above formula to calculate the porosity of the broken rock mass through the volume fraction plate in avizo; use the above formula to calculate the fractal dimension of the broken rock mass through the fractal dimension plate in avizo.

[0102] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0103] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A stress-seepage coupling test device for broken rock mass that can be used for real-time CT, characterized in that: include: Seepage test module, used to place broken rock samples; A water pressure test module, used to provide the water head pressure of the broken rock sample during the seepage process; A stress testing module, used for providing the pressure of the broken rock sample during the seepage process; A CT detection module, used for real-time monitoring of changes in the broken rock sample during the seepage process; The analysis and recording module is used to record in real time the flow rate and water pressure parameters of the broken rock sample during the seepage process.

2. The stress-seepage coupling test device for broken rock mass that can be used for real-time CT according to claim 1 is characterized by: The seepage test module comprises a pressure chamber (13), the pressure chamber (13) is fixed to a base (14) by means of bolts (15), a water inlet end of the base (14) is connected to the bottom of the pressure chamber (13), a water outlet end of the base (14) is connected to a water inlet end of a second flow meter (16), and a water outlet end of the second flow meter (16) is connected to a water inlet end of a third water pipe (17); The second flow meter (16) is electrically connected to the analysis and recording module; The stress testing module is arranged above the pressure chamber (13); The crushed rock sample is placed in the pressure chamber (13), and water-permeable plates (20) are provided on the top and bottom of the crushed rock sample.

3. The stress-seepage coupling test device for broken rock mass applicable to real-time CT according to claim 2 is characterized by: The stress testing module comprises a stopper (10), wherein the stopper (10) is fixedly connected to the top of the pressure chamber (13) via a support rod (21), a pressure-applying portion is provided at the top of the stopper (10), a load-sensing portion is provided at the movable end of the pressure-applying portion, a piston (12) is provided at the bottom end of the load-sensing portion, the piston (12) is a hollow structure, one side of the piston (12) is connected to the liquid outlet end of the water pressure testing module, the piston (12) is vertically slidably arranged in the pressure chamber (13), and the bottom of the piston (12) is in contact with and connected to the water-permeable plate (20) located at the top of the pressure chamber (13).

4. The stress-seepage coupling test device for broken rock mass applicable to real-time CT according to claim 3 is characterized by: The pressure-applying part comprises a pressure device (8), the fixed end of the pressure device (8) is fixedly connected to the fixed end of the planetary reducer (9), the fixed end of the planetary reducer (9) is fixedly connected to the top of the limiter (10), the output shaft of the pressure device (8) is connected to the output shaft of the planetary reducer (9), and the output shaft of the planetary reducer (9) is connected to the load sensing part.

5. The stress-seepage coupling test device for broken rock mass applicable to real-time CT according to claim 4, characterized in that: The load sensing part comprises a load sensor (11), the top of the load sensor (11) is connected to the output shaft of the planetary reducer (9), and the bottom of the load sensor (11) is connected to the top of the piston (12). The load sensor (11) is used to detect the compressive stress applied to the top of the piston (12) by the output shaft of the planetary reducer (9), and the load sensor (11) is electrically connected to the analysis and recording module.

6. The stress-seepage coupling test device for broken rock mass applicable to real-time CT according to claim 3 is characterized by: The water pressure test module comprises a water tank (4), the water outlet at the bottom of the water tank (4) is connected to one side of the top of the piston (12) through a second water pipe (7), a flow meter (6) is provided in the middle of the second water pipe (7), a second pressure gauge (5) is provided at the top of the water tank (4), and the second pressure gauge (5) and the flow meter (6) are electrically connected to the analysis and recording module; The water inlet end of the water tank (4) is connected to a water pressure supply part.

7. The broken rock mass stress-seepage coupling test device applicable to real-time CT according to claim 6 is characterized by: The water pressure supply unit comprises an air compressor (1), the air compressor (1) is connected to the liquid inlet end of the water tank (4) through a first water pipe (3), and a first pressure gauge (2) is provided at the top of the air compressor (1).

8. The device for stress-seepage coupling test of broken rock mass applicable to real-time CT according to claim 2 is characterized by: The CT detection module comprises an X-ray source (18) and an imaging acquisition system (19), wherein the X-ray source (18) and the imaging acquisition system (19) are respectively arranged on two sides of the pressure chamber (13).

9. The stress-seepage coupling test device for broken rock mass applicable to real-time CT according to claim 7, characterized in that: The analysis and recording module comprises a paperless recorder, and the paperless recorder is electrically connected to the first pressure gauge (2), the second pressure gauge (5), the flow meter (6), the second flow meter (16), and the load sensor (11).

Images