A multi-field coupling test and monitoring system for broken rock mass

Abstract

The invention discloses a broken rock multi-field coupling test and monitoring system, which can accurately obtain multi-field coupling test data such as seepage field, temperature field, stress field, strain field, etc. of collapsed broken rock mass under complex disturbance conditions such as static load, impact load, long-term stable load, periodic pulse and vibration load, measured disturbance load, etc., which is convenient for studying the rock-rock and water-rock heat exchange laws, the distribution law of broken rock seepage field, the evolution law of internal stress field of broken rock mass, and the multi-field coupling mechanism of stress field, deformation field, seepage field, temperature field, etc. of complete rock mass lithology, complete rock mass heat source temperature, broken rock mass lithology, particle size, gradation, combined distribution form, etc. under different applied loads, disturbance conditions, initial temperature of seepage fluid, initial pressure of seepage fluid, etc., and provides more accurate test data for the research of deep geothermal mining technology under complex load conditions.

Description

Technical Field

[0001] The invention relates to a broken rock mass test system, in particular to a compaction and permeability multi-field coupling test and monitoring system for simulating complex in-situ disturbances and impact loads on broken rock masses, belonging to the field of geotechnical engineering test technology and equipment. Background Art

[0002] As a clean energy, geothermal energy is gaining increasing attention from all over the world. Geothermal energy is stored underground and is not affected by climatic conditions. It can be used as both base load energy and peak load energy. From the perspective of its development and utilization cost, geothermal energy has the characteristics of low cost, small land occupation and good stability, and has greater development potential than other renewable energy sources. Deep high-temperature geothermal resources suitable for power generation are widely distributed in southern Tibet, western Yunnan and western Sichuan in my country. At present, for this type of geothermal resources, the United States and other Western countries mainly use oil drilling technology. Oil drilling technology has been around for more than 40 years, but there is no real commercial well of hot dry rock. This is mainly due to the small heat exchange area and low utilization rate of geothermal resources when geothermal resources are mined through drilling (hole) method. In response to this problem, my country took the lead in proposing an enhanced geothermal system based on mining caving method, that is, digging a vertical shaft from the surface to the deep, then artificially constructing a certain deep underground space, and then caving the upper rock layer through blasting to construct several times the heat exchange surface. This method has the advantages of high efficiency, low cost and small land occupation. It is an important innovation in the field of deep earth science and technology in China and is of great significance to ensuring energy security. The realization of this technology is a strategic transformation from mining to heat extraction and will give rise to the development of new disciplines.

[0003] As a new geothermal mining method, many experts and scholars at home and abroad have focused on the research of heat exchange process of collapsed rock mass. However, due to the fluidity and heterogeneity of the broken rock mass, as well as the layered and mixed distribution of various lithology broken rock mass after rock collapse, the multi-field coupling problem of broken rock mass seepage field, temperature field, stress field and strain field is extremely complex. The research methods of theoretical and numerical simulation have significant limitations, and the research work must be carried out based on reliable data from laboratory tests.

[0004] However, the existing broken rock test equipment and methods are unable to realize the scientific experimental work in this innovative strategic research field, mainly due to the following aspects: ① It is impossible to conduct coupled tests of compaction, seepage, heat exchange and power on the broken rock at the same time; ② The essence of the enhanced geothermal mining method is that the dry hot rock that is still intact on the upper part after blasting provides a stable heat source, and the broken rock that collapses down increases the heat exchange area, while the existing test equipment directly heats the compaction device of the broken rock as a whole, and cannot simulate the heat exchange process between the intact rock and the broken rock; ③ After compaction in a closed barrel, although the wall of the broken rock can be visualized, the soil pressure, water pressure and temperature at a certain point inside it cannot be accurately measured, and when studying the coupling relationship of various physical quantities, the pressure of the broken rock at a certain point must be measured at the same time , seepage water pressure and temperature. If the various physical quantities are not measured at the same time, or the various physical quantities are measured at different positions, or the position coordinates and stress direction of the measured points cannot be obtained, the test data will be inaccurate; ④ The control and application of dynamic loads are imprecise and the load form is simple. It is impossible to accurately apply the complex and real vibration, impact and other dynamic load wave signals obtained from field tests to the broken rock mass in the laboratory. The existing test technology applies simplified impact dynamic loads to the rock mass and cannot reflect the actual situation, resulting in a large deviation between the experimental results and the actual results; ⑤ Difficult installation and disassembly, and low test efficiency. Since the broken rock pressure chamber requires greater rigidity, the thickness and weight of each part of the pressure chamber are large, it is difficult to install and disassemble by manpower, and the broken rock mass after the compaction test forms a vacuum locally, which aggravates the difficulty of disassembly.

[0005] Therefore, it is urgent to invent a test and monitoring device suitable for multi-field coupling research of broken rock mass, which has accurate simulation conditions, reliable monitoring data inside broken rock mass, high dynamic load accuracy and complexity, convenient installation and disassembly, and high degree of automation, so as to provide a key test platform for the research of deep geothermal mining technology under complex load conditions. Summary of the invention

[0006] In view of the above problems, the present invention provides a broken rock multi-field coupling test and monitoring system, which can monitor the distribution of internal seepage pressure of broken rock along the loading direction under the premise of automatically inverting complex in-situ disturbance loads and simulating complex dynamic loads, and obtain the test parameters of seepage path evolution, so as to provide more accurate test data for the research of deep geothermal exploitation technology under complex load conditions.

[0007] To achieve the above purpose, this broken rock mass multi-field coupling test and monitoring system includes an integral frame, a pressure chamber part, a pressure loading control part, a permeable liquid supply control part, an in-situ disturbance excitation control part, a sample internal detection part and a centralized electric control part;

[0008] The pressure chamber part includes a pressure chamber arranged inside the integral frame, the pressure chamber includes a pressure chamber base, an interlayer tube wall and a pressure chamber top pressure head; the pressure chamber base is coaxially detachably positioned and installed on the top of the telescopic end of the loading hydraulic cylinder through the pressure chamber base positioning and mounting component, a seepage outlet channel is provided inside the pressure chamber base, the inlet end of the seepage outlet channel is connected with the top plane of the pressure chamber base, the outlet end of the seepage outlet channel is connected to the seepage treatment device through the outlet seepage flow sensor, the bottom of the interlayer tube wall is coaxially and tightly fixed on the pressure chamber base, the interlayer tube wall and the pressure chamber base together form a barrel-shaped structure, the inside of the interlayer tube wall is provided with a rigid heat-conducting inner tube wall, an annular rock tube interlayer, an annular heating interlayer and a rigid heat-insulating outer tube wall in sequence from the inside to the outside along its radial direction, a tube wall side pressure dynamic sensor is provided on the rigid heat-conducting inner tube wall, the annular rock tube sample is installed in the annular rock tube interlayer through the annular rock tube interlayer cover, and the upper and lower ends of the annular rock tube sample are provided with heat-insulating gaskets, and the annular heating interlayer is provided inside There are a heating interlayer temperature sensor and electric heating wires evenly arranged from bottom to top; a lower water-permeable plate with an outer diameter matching the inner diameter of the rigid heat-conducting inner tube wall is arranged at the bottom of the inner cavity of the rigid heat-conducting inner tube wall, and a plurality of water-permeable through holes connected to the seepage outlet channel are evenly arranged on the lower water-permeable plate; a pressure chamber top pressure head is coaxially arranged on the top of the interlayer tube wall, and the outer diameter of the bottom of the pressure chamber top pressure head matches the inner diameter of the rigid heat-conducting inner tube wall, a liquid inlet hole penetrating the pressure chamber top pressure head is arranged on the pressure chamber top pressure head, and the liquid inlet hole An orifice injection temperature, pressure and flow sensor is provided at the orifice position of the hole, an upper water-permeable plate whose outer diameter matches the inner diameter of the rigid heat-conducting inner cylinder wall is provided at the bottom end of the pressure chamber top pressure head, and a plurality of water-permeable through holes connected to the liquid inlet are evenly distributed on the upper water-permeable plate, a concave spherical structure is provided at the symmetrical center position of the top of the pressure chamber top pressure head, and a DC excitation coil is provided at the top of the pressure chamber top pressure head; the seepage treatment device includes a solid-liquid separation mechanism, and an electronic scale for weighing the discharged sample rock particles is provided on the solid-liquid separation mechanism;

[0009] The permeate liquid supply control part includes a permeate liquid pumping device and a permeate pumping electric control device electrically connected to the permeate liquid pumping device, the input end of the permeate liquid pumping device is connected to the permeate liquid supply box through a pipeline, the output end of the permeate liquid pumping device is connected to the input end of the inlet liquid heating device through a pipeline, and the output end of the inlet liquid heating device is connected to the liquid inlet hole through the inlet liquid temperature control device and the pipeline;

[0010] The in-situ disturbance excitation control part includes a disturbance signal execution device and a disturbance signal excitation electronic control device; the disturbance signal execution device includes a positioning pressure head, the positioning pressure head is vertically installed on the integral frame at the position corresponding to the pressure head on the top of the pressure chamber, and a positioning pressure head lifting structure is provided on the positioning pressure head, the bottom end of the positioning pressure head is a convex spherical structure arranged to match the concave spherical structure at the top of the pressure head on the top of the pressure chamber, an AC excitation coil is provided on the positioning pressure head, and an in-situ disturbance dynamic pressure sensor is also provided on the positioning pressure head or the pressure chamber top pressure head; the disturbance signal excitation electronic control device includes a controllable AC excitation module and a DC power supply module, the controllable AC excitation module is electrically connected to the AC excitation coil, and the DC power supply module is electrically connected to the DC excitation coil;

[0011] The internal detection part of the sample includes a plurality of non-contact dynamic solid-liquid separation sensing devices arranged in the barrel-shaped structure of the pressure chamber part and a magnetic field positioning component arranged on the rigid heat-conducting inner cylinder wall; the non-contact dynamic solid-liquid separation sensing device includes a supporting and fixing skeleton forming a square three-dimensional frame structure and a solid-liquid separation rigid isolation net wrapped on the supporting and fixing skeleton. The two vertices of the square three-dimensional frame structure opposite to each other in space are used as reference points. The square three-dimensional frame structure is divided into a first part and a second part with three adjacent faces in space, each centered on the vertex. The supporting and fixing skeleton of the first part is a rigid supporting and fixing skeleton. An electronic gyroscope, a sample water pressure sensor, a sample temperature sensor, a space electromagnetic positioning sensor, and a data synchronization integrated processing electric control mechanism are fixed on the inner surface of the rigid supporting and fixing skeleton. The space electromagnetic positioning sensor is positioned at the spatial geometric center of the square three-dimensional frame structure. The data synchronization integrated processing electric control mechanism includes a sensor controller, a power supply circuit, and a sensor controller. They are electrically connected to the electronic gyroscope, the sample water pressure sensor, the sample temperature sensor, and the space electromagnetic positioning sensor respectively. The support and fixing skeleton of the second part is an elastic support and fixing skeleton. The outer surfaces of the three adjacent surfaces of the elastic support and fixing skeleton are respectively provided with space three-dimensional stress sensors, and the inner surface of the elastic support and fixing skeleton is fixed with stress test demodulators electrically connected to the three-dimensional stress sensors respectively. The stress test demodulator is electrically connected to the sensor controller of the data synchronization integrated processing electronic control mechanism. The adjacent rigid support and fixing skeletons are fixedly installed and connected to the elastic support and fixing skeleton to form an overall square three-dimensional frame structure; the magnetic field positioning component includes an upper magnetic field positioning component fixedly set in the top plane of the rigid heat-conducting inner cylinder wall and a lower magnetic field positioning component fixedly set in the bottom plane of the rigid heat-conducting inner cylinder wall. The upper magnetic field positioning component and the lower magnetic field positioning component are respectively set as two pieces arranged along the radial direction of the rigid heat-conducting inner cylinder wall, and the connection line of the two upper magnetic field positioning components is vertically set to the connection line of the two lower magnetic field positioning components in space;

[0012] The centralized electronic control part includes a computer, a data acquisition module, a pressure loading control circuit, a temperature control circuit, an injection control circuit, an in-situ disturbance excitation control circuit, a sample internal detection control circuit, and a data analysis and calculation circuit. The computer is respectively electrically connected to the hydraulic pump station, the seepage pumping electronic control device, the inlet liquid temperature control device, the disturbance signal excitation electronic control device, the data acquisition module, the magnetic field positioning component and the electric heating wire of the annular heating interlayer. The data acquisition module is respectively electrically connected to the orifice injection temperature pressure flow sensor, the outlet seepage flow sensor, the cylinder wall side pressure dynamic sensor, the heating interlayer temperature sensor, the in-situ disturbance dynamic pressure sensor, the data synchronization integrated processing electronic control mechanism, and the electronic scale of the seepage treatment device.

[0013] As a further improvement scheme of the present invention, the bottom of the visualized pressure chamber wall is detachably fixedly installed on the pressure chamber base; the broken rock multi-field coupling test and monitoring system also includes a pressure chamber top pressure head disassembly part, the pressure chamber top pressure head disassembly part includes a pressure chamber top pressure head lifting control mechanism arranged on the integral frame and a positioning pressure seat clamping mechanism installed on the pressure chamber top pressure head lifting control mechanism, the positioning pressure seat clamping mechanism is used to clamp and position the positioning pressure seat when the pressure chamber top pressure head is removed after the test is completed, the pressure chamber top pressure head lifting control mechanism is used to lift and lower the positioning pressure seat when the pressure chamber top pressure head is removed after the test is completed, and the pressure chamber top pressure head lifting control mechanism and the positioning pressure seat clamping mechanism are respectively electrically connected to the computer.

[0014] As an embodiment of the pressure chamber top pressure head disassembly part of the present invention, the pressure chamber top pressure head lifting control mechanism is a gear rack structure symmetrically arranged relative to the center of the pressure chamber top pressure head, including a rack guide and a driving gear, the rack guide is vertically fixedly installed on the integral frame, a driving gear with a driving motor is meshingly arranged on the rack guide, and the driving gear is installed on the integral frame through a driving gear support frame that slides vertically on the integral frame, and a horizontal limiting structure is provided between the driving gear support frame and the integral frame, which can limit the driving gear support frame from separating from the integral frame; the positioning pressure seat clamping mechanism is a horizontal telescopic clamping structure, including a telescopic loading and unloading arm horizontally installed on the driving gear support frame, and a top cover loading and unloading hole is also provided on the positioning pressure seat at a position corresponding to the telescopic loading and unloading arm.

[0015] As another embodiment of the pressure chamber top pressure head disassembly part of the present invention, the pressure chamber top pressure head lifting control mechanism is a hydraulic cylinder structure symmetrically arranged relative to the center of the pressure chamber top pressure head, including a positioning pressure seat lifting hydraulic cylinder, the positioning pressure seat lifting hydraulic cylinder is tilted with a low cylinder bottom end and a high telescopic end, the cylinder bottom end of the positioning pressure seat lifting hydraulic cylinder is hingedly mounted on the integral frame, and the positioning pressure seat lifting hydraulic cylinder is connected to the hydraulic pump station through a hydraulic pipeline and a control valve group; the positioning pressure seat clamping mechanism is a bayonet clamping structure, including a clamping block hingedly mounted on the telescopic end of the positioning pressure seat lifting hydraulic cylinder, and a limiting clamping ring structure is also provided at the position of the positioning pressure seat corresponding to the clamping block.

[0016] As a further improvement of the present invention, a magnetic shielding wrapping layer is provided on the surface of the integral frame.

[0017] As a further improvement of the present invention, a drying mechanism is further provided on the solid-liquid separation mechanism of the seepage treatment device.

[0018] As a further improvement of the present invention, a replaceable lost particle size control net is provided above the lower water permeable plate, and the aperture of the lost particle size control net is smaller than the aperture of the water permeable through hole of the lower water permeable plate.

[0019] As a further improvement of the present invention, a middle isolation layer is provided between the annular rock tube interlayer and the annular heating interlayer.

[0020] As a further improvement of the present invention, the data synchronization integrated processing electronic control mechanism also includes a sensor data storage device electrically connected to the sensor controller.

[0021] As a further improvement of the present invention, the data synchronization integrated processing electronic control mechanism and the data acquisition module are both provided with a wireless transceiver module, and the data synchronization integrated processing electronic control mechanism and the data acquisition module are connected by radio.

[0022] Compared with the existing technology, this broken rock multi-field coupling test and monitoring system can restore the in-situ disturbance load obtained by field testing of geothermal wells, and can accurately obtain the static load, impact load, long-term stable load, periodic pulse and vibration load, measured disturbance load, seepage pressure and other data of the collapsed broken rock mass under the multi-field coupling conditions of seepage field, temperature field, stress field, strain field and complex in-situ disturbance conditions. It can monitor the key test parameters such as dynamic and static loads, pressure chamber wall side pressure, pressure chamber inlet pressure, pressure chamber outlet flow, outlet loss particle mass, osmotic pressure distribution in the pressure chamber, seepage path, broken rock crack fractal dimension, rock sample and seepage fluid temperature in real time, and the disturbance load control accuracy is high. , the simulation of dynamic loads is highly complex, the monitoring data is comprehensive, the monitoring data is accurate, the installation and disassembly is convenient, and the automation level is high; by setting different types of rock samples and the distribution thickness of different types of rock samples, different types of annular rock tube samples, different rock sample heating temperatures, and different seepage fluid heating temperatures, it is easy to study the heat exchange law between rocks, it is easy to study the influence of seepage fluids of different temperatures on the seepage field of broken rock masses, it is easy to study the response law and mechanism of the seepage pressure gradient inside broken rock masses under different temperature field environments, complex dynamic load environments, and mixed layered arrangements of multiple rock samples, and it can provide more accurate test data for the research of deep geothermal mining technology under complex load conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the present invention when the top pressure head of the pressure chamber adopts the hydraulic control structure when the part is disassembled;

[0025] Figure 3 It is a schematic structural diagram of the pressure chamber part of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the non-contact dynamic solid-liquid separation sensing device of the present invention;

[0027] Figure 5 It is a structural schematic diagram of a square three-dimensional frame structure of the non-contact dynamic solid-liquid separation sensor device of the present invention divided into two parts;

[0028] Figure 6 It is a structural schematic diagram of the first part of the square three-dimensional frame structure of the non-contact dynamic solid-liquid separation sensor device of the present invention;

[0029] Figure 7 It is a structural schematic diagram of the second part of the square three-dimensional frame structure of the non-contact dynamic solid-liquid separation sensor device of the present invention;

[0030] Figure 8It is a schematic diagram of the arrangement of the magnetic field positioning component of the present invention;

[0031] Fig. 9 It is a schematic cross-sectional structural diagram of the lower water-permeable plate of the present invention;

[0032] Fig.10 It is a schematic diagram of the setting of the lost particle size control network of the present invention.

[0033] In the figure: 1. integral frame, 2. hydraulic pump station, 3. main oil cylinder, 4. pressure chamber base, 5. seepage outlet channel, 6. seepage treatment device, 9. sandwich tube wall, 9-1. rigid heat-conducting inner tube wall, 9-2. annular rock tube interlayer, 9-3. middle isolation layer, 9-4. annular heating interlayer, 9-5. annular rock tube specimen, 9-6. annular rock tube interlayer cover, 9-7. insulation gasket, 10. upper permeable plate, 11. lower permeable plate, 12. Heating interlayer temperature sensor, 13. Fastening bolts, 14. Pressure chamber top pressure head, 15. Liquid inlet hole, 16. Top cover loading and unloading hole, 17. DC excitation coil, 19. In-situ disturbance dynamic pressure sensor, 20. AC excitation coil, 21. Positioning pressure head, 22. Driving gear, 23. Telescopic loading and unloading arm, 24. Rack guide rail, 25. Orifice injection temperature, pressure and flow sensor, 26. Main oil cylinder status monitoring sensor, 2 7. Non-contact dynamic solid-liquid separation sensing device, 27-1. Rigid support fixed skeleton, 27-2. Solid-liquid separation rigid isolation net, 27-3. Electronic gyroscope, 27-4. Sample water pressure sensor, 27-5. Sample temperature sensor, 27-6. Space positioning sensor, 27-7. Data synchronization integrated processing electronic control mechanism, 27-8. Space three-dimensional stress sensor, 27-9. Stress test demodulator, 28. Testing machine information integration control module, 29. Seepage liquid supply box, 30. Seepage liquid pumping device, 31. Seepage voltage stabilizing device, 32. Seepage pumping electronic control device, 33. DC power supply module, 34. Controllable AC excitation module, 35. Disturbance signal excitation electronic control device, 36. Computer, 38. Pressure chamber, 39. Lost particle size control network, 40. Inlet liquid heating device, 41. Inlet liquid temperature control device, 42. Magnetic field positioning component.

[0034] a, a', b, b', c, c', d, d' are vertices of the square three-dimensional frame structure of the non-contact dynamic solid-liquid separation sensing device. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings.

[0036] like Figure 1As shown, the broken rock multi-field coupling test and monitoring system includes an integral frame 1, a pressure chamber part, a pressure loading control part, a permeable liquid supply control part, an in-situ disturbance excitation control part, a sample internal detection part and a centralized electrical control part.

[0037] The pressure loading control part is fixedly arranged at the inner bottom of the integral frame 1, and includes a hydraulic pump station 2 and a loading hydraulic cylinder 3. The loading hydraulic cylinder 3 is vertically fixedly arranged on the integral frame 1, and the telescopic end of the loading hydraulic cylinder 3 is vertically pushed out upward. The loading hydraulic cylinder 3 is connected to the hydraulic pump station 2 through a hydraulic pipeline and a control valve group.

[0038] The pressure chamber part includes a pressure chamber 38 arranged inside the integral frame 1, such as Figure 3 As shown, the pressure chamber 38 includes a pressure chamber base 4, an interlayer tube wall 9 and a pressure chamber top pressure head 14; the pressure chamber base 4 is coaxially detachably positioned and installed on the top of the telescopic end of the loading hydraulic cylinder 3 through the pressure chamber base positioning and installation component, and the pressure chamber base 4 is provided with a seepage outlet channel 5 that penetrates the pressure chamber base 4. The inlet end of the seepage outlet channel 5 is connected to the top plane of the pressure chamber base 4, and the outlet end of the seepage outlet channel 5 is connected to the seepage treatment device 6 through the outlet seepage flow sensor. The bottom of the interlayer tube wall 9 is coaxially and tightly fixed on the pressure chamber base 4, and the interlayer tube wall 9 and the pressure chamber base 4 together form a barrel-shaped structure, and the inside of the interlayer tube wall 9 is sequentially arranged from the inside to the outside along its radial direction. A rigid heat-conducting inner cylinder wall 9-1, an annular rock cylinder interlayer 9-2, an annular heating interlayer 9-4 and a rigid heat-insulating outer cylinder wall are provided. A cylinder wall side pressure dynamic sensor and an inner cylinder wall temperature sensor are provided on the rigid heat-conducting inner cylinder wall 9-1. An annular rock cylinder sample 9-5 is installed in the annular rock cylinder interlayer 9-2 through an annular rock cylinder interlayer cover 9-6, and insulation gaskets 9-7 are provided at the upper and lower ends of the annular rock cylinder sample 9-5. A heating interlayer temperature sensor 12 and electric heating wires evenly distributed from bottom to top are provided inside the annular heating interlayer 9-4. A lower water-permeable plate 11 whose outer diameter matches the inner diameter of the rigid heat-conducting inner cylinder wall 9-1 is provided at the bottom of the inner cavity. Fig. 9As shown, a plurality of water-permeable through holes connected to the seepage outlet channel 5 are evenly distributed on the lower water-permeable plate 11; a pressure chamber top pressure head 14 is coaxially arranged on the top of the interlayer cylinder wall 9, and the outer diameter size of the bottom of the pressure chamber top pressure head 14 matches the inner diameter size of the rigid heat-conducting inner cylinder wall 9-1, a liquid inlet hole 15 penetrating the pressure chamber top pressure head 14 is provided on the pressure chamber top pressure head 14, and an orifice position of the liquid inlet hole 15 is provided with an orifice injection temperature pressure flow sensor 25, an upper water-permeable plate 10 whose outer diameter size matches the inner diameter size of the rigid heat-conducting inner cylinder wall 9-1 is provided at the bottom end of the pressure chamber top pressure head 14, and a plurality of water-permeable through holes connected to the liquid inlet hole 15 are evenly distributed on the upper water-permeable plate 10, and the pressure chamber top pressure head 14 is provided with a plurality of water-permeable through holes connected to the liquid inlet hole 15. A concave spherical structure is provided at the symmetrical center position of the top of the pressure head 14, and a DC excitation coil 17 is provided on the top of the pressure head 14 at the top of the pressure chamber. In order to facilitate the degassing during the injection process, the liquid inlet hole 15 can be additionally provided with a degassing channel, and a degassing control valve can be provided on the degassing channel. Degassing can be achieved by opening the degassing control valve during the injection process. The degassing control valve can also be opened during the disassembly process after the test to allow the crushed rock sample to be aired in and de-vacuumed; the seepage treatment device 6 includes a solid-liquid separation mechanism, which can simply adopt a filter screen or filter bag structure, or other solid-liquid separation structures such as a cyclone. The solid-liquid separation mechanism is provided with an electronic scale for weighing the discharged sample rock particles.

[0039] The seepage liquid supply control part includes a seepage liquid pumping device 30 and a seepage pumping electronic control device 32 electrically connected to the seepage liquid pumping device 30. The input end of the seepage liquid pumping device 30 is connected to the seepage liquid supply box 29 through a pipeline, and the output end of the seepage liquid pumping device 30 is connected to the input end of the inlet liquid heating device 40 through a pipeline. The output end of the inlet liquid heating device 40 is connected to the liquid inlet hole 15 through an inlet liquid temperature control device 41 and a pipeline.

[0040] The in-situ disturbance excitation control part includes a disturbance signal execution device and a disturbance signal excitation electronic control device 35; the disturbance signal execution device includes a positioning pressure head 21, the positioning pressure head 21 is vertically installed on the integral frame 1 corresponding to the position of the pressure chamber top pressure head 14, and the positioning pressure head 21 is provided with a positioning pressure head lifting structure, the bottom end of the positioning pressure head 21 is a convex spherical structure arranged to cooperate with the concave spherical structure at the top of the pressure chamber top pressure head 14, the positioning pressure head 21 is provided with an AC excitation coil 20, and the positioning pressure head 21 or the pressure chamber top pressure head 14 is also provided with an in-situ disturbance dynamic pressure sensor 19; the disturbance signal excitation electronic control device 35 includes a controllable AC excitation module 34 and a DC power supply module 33, the controllable AC excitation module 34 is electrically connected to the AC excitation coil 20, and the DC power supply module 33 is electrically connected to the DC excitation coil 17.

[0041] The sample internal detection part includes a plurality of non-contact dynamic solid-liquid separation sensing devices 27 arranged in the barrel-shaped structure of the pressure chamber part and a magnetic field positioning component 42 arranged on the rigid heat-conducting inner barrel wall 9-1; Figure 4 As shown, the non-contact dynamic solid-liquid separation sensor device 27 includes a supporting fixed frame 27-1 forming a square three-dimensional frame structure and a solid-liquid separation rigid isolation net 27-2 wrapped around the supporting fixed frame 27-1, with two vertices (such as Figure 6 , Figure 7 The vertex c' and vertex b) shown in the figure are used as reference points, and the square three-dimensional frame structure is as follows Figure 5 As shown, it is divided into two parts, the first part and the second part, each of which is centered on the vertex and has three spatially adjacent faces, as shown in FIG. Figure 6 As shown, the support and fixing skeleton 27-1 of the first part adopts a rigid support and fixing skeleton that can reduce deformation errors and achieve accurate positioning, and an electronic gyroscope 27-3, a sample water pressure sensor 27-4, a sample temperature sensor 27-5, a space electromagnetic positioning sensor 27-6, and a data synchronization integrated processing electric control mechanism 27-7 are fixed on the inner surface of the rigid support and fixing skeleton, and the space electromagnetic positioning sensor 27-6 is positioned and arranged at the spatial geometric center position of the square three-dimensional frame structure, and the data synchronization integrated processing electric control mechanism 27-7 includes a sensor controller and a power supply circuit, and the sensor controller is electrically connected to the electronic gyroscope 27-3, the sample water pressure sensor 27-4, the sample temperature sensor 27-5, and the space electromagnetic positioning sensor 27-6, respectively, as shown in FIG. Figure 7 As shown, the support and fixed skeleton 27-1 of the second part adopts an elastic support and fixed skeleton with large rigidity that can realize elastic deformation and test three-dimensional stress through skeleton deformation. The outer surfaces of the three adjacent surfaces of the elastic support and fixed skeleton are respectively provided with spatial three-dimensional stress sensors 27-8, and the inner surfaces of the elastic support and fixed skeleton are fixed with stress test demodulators 27-9 electrically connected to the three-dimensional stress sensors 27-8 respectively. The stress test demodulator 27-9 is electrically connected to the sensor controller of the data synchronization integrated processing electronic control mechanism 27-7, and the adjacent rigid support and fixed skeleton is fixedly installed and connected with the elastic support and fixed skeleton; as shown Figure 8 As shown, the magnetic field positioning component 42 includes an upper magnetic field positioning component fixedly arranged in the top plane of the rigid heat-conducting inner cylinder wall 9-1 and a lower magnetic field positioning component fixedly arranged in the bottom plane of the rigid heat-conducting inner cylinder wall 9-1. The upper magnetic field positioning component and the lower magnetic field positioning component are respectively arranged as two pieces arranged along the radial direction of the rigid heat-conducting inner cylinder wall 9-1, and the connecting line of the two upper magnetic field positioning components is vertically arranged in space to the connecting line of the two lower magnetic field positioning components.

[0042] The centralized electronic control part includes a computer 36, a data acquisition module 28, a pressure loading control circuit, a temperature control circuit, an injection control circuit, an in-situ disturbance excitation control circuit, a sample internal detection control circuit, and a data analysis and calculation circuit. The computer 36 is respectively electrically connected to the hydraulic pump station 2, the seepage pumping electronic control device 32, the inlet liquid temperature control device 41, the disturbance signal excitation electronic control device 35, the data acquisition module 28, the magnetic field positioning component 42 and the electric heating wire of the annular heating interlayer 9-4. The data acquisition module 28 is respectively electrically connected to the orifice injection temperature pressure flow sensor 25, the outlet seepage flow sensor, the cylinder wall side pressure dynamic sensor, the heating interlayer temperature sensor 12, the in-situ disturbance dynamic pressure sensor 19, the data synchronization integrated processing electronic control mechanism 27-7, and the electronic scale of the seepage treatment device 6.

[0043] Before conducting the test using the present broken rock multi-field coupling test and monitoring system, the interlayer tube wall 9 and the pressure chamber base 4 are first fixedly installed to form a barrel-shaped pressure chamber 38, the annular rock tube sample 9-5 is installed in the annular rock tube interlayer 9-2 through the heat insulating gasket 9-7, and then the annular rock tube interlayer cover 9-6 is installed, and then a single type of broken rock sample or a layered combination of broken rock samples of different lithology and particle size, and a plurality of non-contact dynamic solid-liquid separation sensor devices 27 are placed in the pressure chamber 38, and the plurality of non-contact dynamic solid-liquid separation sensor devices 27 are evenly arranged in the broken rock mass. In the sample, then install the pressure chamber top pressure head 14, adjust the lifting structure on the positioning pressure head 21 to make the positioning pressure head 21 move up to make way, hoist the pressure chamber 38 as a whole or send it into the integral frame 1 through a translation conveyor, and use the positioning structure on the top surface of the telescopic end of the loading hydraulic cylinder 3 and the pressure chamber base positioning and mounting components to coaxially position the pressure chamber base 4 on the top of the telescopic end of the loading hydraulic cylinder 3, adjust the lifting structure on the positioning pressure head 21 again to make the positioning pressure head 21 descend and close to the pressure chamber top pressure head 14, then connect the water pipeline and the electrical pipeline, and start the centralized electronic control part.

[0044] The computer 36 first energizes the magnetic field positioning component 42 to generate a magnetic field. Through the real-time feedback of the spatial electromagnetic positioning sensor 27-6 and the electronic gyroscope 27-3, the computer 36 obtains the specific three-dimensional coordinate position data and spatial angle posture data of each non-contact dynamic solid-liquid separation sensor device 27 located in the pressure chamber 38, and on the other hand, realizes the time synchronization of the initial state of each non-contact dynamic solid-liquid separation sensor device 27; the computer 36 can realize the heating of the annular rock tube sample 9-5 by controlling the electric heating wire of the annular heating interlayer 9-4, and then realize the heat exchange between the annular rock tube sample 9-5 and the broken rock sample, and the temperature feedback of the inner tube wall temperature sensor and the non-contact dynamic solid-liquid separation sensor device 27 facilitates the study of the heat exchange law between rocks; the computer 36 controls the inlet liquid temperature control device 41 The inlet temperature and the temperature difference limit value are set, and the temperature control device 41 controls the inlet liquid heating device 40 to heat the seepage liquid. After the seepage liquid is heated to the set inlet temperature, the seepage liquid flows into the liquid inlet 15. At the same time, the orifice injection temperature pressure flow sensor 25 measures the instantaneous temperature of the seepage liquid at the liquid inlet and feeds it back to the temperature control device 41. The temperature control device 41 calculates the temperature difference between the instantaneous inlet temperature and the set temperature. If the temperature difference is less than the set temperature difference limit, the liquid supply continues; if the temperature difference is greater than the set temperature difference limit, the temperature control device 41 controls the inlet liquid heating device 40 to fine-tune the temperature and accurately control the constant temperature conditions, which is convenient for studying the water-rock heat exchange law, the distribution law of the seepage field of the broken rock mass, the evolution law of the internal stress field of the broken rock mass, and the coupling mechanism of multiple fields such as the stress field, deformation field, seepage field, and temperature field.

[0045] During the test, the computer 36 controls the hydraulic pump station 2 to work through the pressure loading control circuit so that the loading hydraulic cylinder 3 is lifted to input the pressure load to the broken rock sample in the pressure chamber 38. At the same time, the computer 36 controls the seepage pumping electronic control device 32 to work through the injection control circuit so that the seepage liquid is heated by the inlet liquid heating device 40 and the inlet liquid temperature control device 41 and then enters the liquid inlet hole 15. The computer 36 controls each non-contact dynamic solid-liquid separation sensor device 27 to work simultaneously through the sample internal detection control circuit; each data synchronization integration processing electronic control mechanism 27-7 synchronously feeds back the specific three-dimensional coordinate position data and spatial angle posture data of each non-contact dynamic solid-liquid separation sensor device 27 in the pressure chamber 38 to the data acquisition module 28 through the space electromagnetic positioning sensor 27-6 and the electronic gyroscope 27-3 according to the same set time period. The computer 36 calculates and establishes the sample internal test point motion according to the specific three-dimensional coordinate position data and spatial angle posture data of each non-contact dynamic solid-liquid separation sensor device 27 collected by the data acquisition module 28 and the built-in program. dynamic distribution model; each data synchronous integration processing electronic control mechanism 27-7 feeds back the three-dimensional earth pressure data from the broken rock sample borne by the non-contact dynamic solid-liquid separation sensor device 27, the water temperature data and water pressure data from the seepage fluid in the pressure chamber 38 to the data acquisition module 28 according to the same set time period; the computer 36 obtains the specific spatial direction and corresponding stress data of the three-dimensional earth pressure data according to the three-dimensional earth pressure data collected by the data acquisition module 28 and the spatial angle posture data fed back by the electronic gyroscope 27-3, and the stress data fed back by the stress test demodulator 27-9, and calculates the stress field data in any direction by the difference method, and then constructs the internal stress model of the broken rock sample on the basis of the dynamic distribution model of the internal test point of the sample; the computer 36 obtains the temperature field data and the water pressure gradient distribution data according to the water temperature data and water pressure data of the seepage fluid collected by the data acquisition module 28 and the built-in program, and constructs the internal temperature model of the broken rock sample and the water pressure gradient distribution model of the seepage water in the broken rock sample on the basis of the dynamic distribution model of the internal test point of the sample;The in-situ disturbance dynamic pressure sensor 19 feeds back the pressure data of the pressure chamber top pressure head 14 to the data acquisition module 28 in real time, the orifice injection temperature pressure flow sensor 25 feeds back the initial pressure data of the injected seepage fluid to the data acquisition module 28 in real time, the outlet seepage flow sensor feeds back the pressure data of the discharged seepage fluid to the data acquisition module 28 in real time, the cylinder wall side pressure dynamic sensor feeds back the confining pressure data of the rigid heat-conducting inner cylinder wall 9-1 on the broken rock sample to the data acquisition module 28 in real time, the inner cylinder wall temperature sensor feeds back the temperature data of the rigid heat-conducting inner cylinder wall 9-1 to the data acquisition module 28 in real time, the electronic scale of the seepage treatment device 6 feeds back the mass data of the leaked rock particles to the data acquisition module 28, and the computer 36 respectively performs error analysis calculation and average output on the pressure data of the pressure chamber top pressure head 14, the initial pressure data of the injected seepage fluid, the pressure data of the discharged seepage fluid, the confining pressure data of the rigid heat-conducting inner cylinder wall 9-1, the temperature data of the rigid heat-conducting inner cylinder wall 9-1, and the mass data of the discharged rock particles collected by the data acquisition module 28;

[0046] When performing a static load test, the computer 36 controls the loading hydraulic cylinder 3 to output a stable rated static load, which can simulate the situation where the broken rock mass is subjected to a long-term stable load;

[0047] When conducting a static load + preset dynamic load test, the static load size, loading speed, dynamic load form, period, amplitude, peak value, number of cycles, superposition method and other characteristic data are set in the computer 36. Then, while the computer 36 controls the loading hydraulic cylinder 3 to output a stable rated static load, the computer 36 controls the disturbance signal through the in-situ disturbance excitation control loop to excite the electronic control device 35 to make the DC excitation coil 17 and the AC excitation coil 20 generate magnetic flux, and an electromagnetic force is generated between the positioning pressure head 21 and the pressure chamber top pressure head 14. The positioning pressure head 21 and the pressure chamber top pressure head 14 are relatively excited to realize static load disturbance, which can simulate the situation where the broken rock mass is subjected to the superposition of periodic disturbance loads, impact loads and other loads in a preset form while being subjected to a long-term stable load;

[0048] When performing a static load + in-situ disturbance load or a modified in-situ disturbance load test, the static load size and loading speed are set in the computer 36, and then the in-situ disturbance signal measured on site is imported into the computer 36, and then the intervention conditions of the in-situ disturbance are set in the computer 36, or the in-situ disturbance signal is artificially modified first (such as adjusting the peak value of the in-situ disturbance signal to simulate extreme conditions, superimposing periodic loads or impact loads to simulate the superposition of multiple disturbance factors, etc.) and then the modified in-situ disturbance intervention conditions are set; then the computer 36 controls the loading hydraulic cylinder 3 to output a stable rated static load At the same time, the computer 36 monitors the static load loading state. When the static load loading condition reaches the set in-situ disturbance intervention condition, the computer 36 controls the disturbance signal through the in-situ disturbance excitation control loop to excite the electronic control device 35 to make the DC excitation coil 17 and the AC excitation coil 20 generate magnetic flux, and an electromagnetic force is generated between the positioning pressure head 21 and the pressure chamber top pressure head 14. The positioning pressure head 21 and the pressure chamber top pressure head 14 are relatively excited to realize in-situ disturbance or modified in-situ disturbance, which can simulate the situation where the broken rock mass is subjected to the in-situ disturbance load or the modified in-situ disturbance load while bearing the static load.

[0049] Since the broken rock sample is compacted into a dense integrated structure during the test loading process, and the injection process causes the cracks inside the broken rock sample to be filled with infiltrated liquid, the inside of the dense integrated structure broken rock sample is in an almost vacuum state, which causes the pressure chamber top pressure head 14 to be compacted and adhered to the dense integrated structure broken rock sample after the test is completed, making it difficult to separate, and thus making it difficult to remove the sample. In order to facilitate the removal of the sample, as a further improvement of the present invention, the bottom of the interlayer cylinder wall 9 is coaxially and tightly fixed on the pressure chamber base 4 by fastening bolts 13; the broken rock multi-field coupling test and monitoring system also includes a pressure chamber top pressure head disassembly part, the pressure chamber top pressure head disassembly part includes a pressure chamber top pressure head lifting control mechanism arranged on the integral frame 1 and a positioning pressure seat clamping mechanism installed on the pressure chamber top pressure head lifting control mechanism, the positioning pressure seat clamping mechanism is used to clamp and position the pressure chamber top pressure head 14 when the pressure chamber top pressure head 14 is removed after the test is completed, and the pressure chamber top pressure head lifting control mechanism is used to remove the pressure chamber top pressure head after the test is completed At 14, the pressure chamber top pressure head 14 is lifted and lowered, and the pressure chamber top pressure head lifting control mechanism and the positioning pressure seat clamping mechanism are electrically connected to the computer 36 respectively. When the pressure chamber top pressure head 14 is removed after the test is completed, the pressure chamber top pressure head 14 can be lifted by controlling the actions of the pressure chamber top pressure head lifting control mechanism and the positioning pressure seat clamping mechanism, thereby realizing the separation and removal of the pressure chamber top pressure head 14 from the dense integrated structure broken rock sample. After the pressure chamber top pressure head 14 is removed and the pressure chamber 38 is moved out of the integral frame 1, the interlayer tube wall 9 and the sample can be separated and removed by injecting water into the pressure chamber 38 and removing the fastening bolts 13.

[0050] As an embodiment of the pressure chamber top pressure head disassembly part of the present invention, the pressure chamber top pressure head lifting control mechanism is as follows Figure 1 The gear rack structure shown is symmetrically arranged relative to the center of the pressure head 14 of the pressure chamber, including a rack guide rail 24 and a driving gear 22. The rack guide rail 24 is vertically fixedly installed on the integral frame 1. The driving gear 22 with a driving motor is meshingly arranged on the rack guide rail 24, and the driving gear 22 is installed on the integral frame 1 through a driving gear support frame in a vertical sliding direction. A horizontal limiting structure such as a T-slot structure and a dovetail groove structure is provided between the driving gear support frame and the integral frame 1. The horizontal limiting structure can limit the driving gear support frame from being separated from the integral frame 1; the positioning pressure seat clamping mechanism is as follows Figure 1 The horizontal telescopic clamping structure shown includes a telescopic loading and unloading arm 23 horizontally mounted on a driving gear support frame, and a top cover loading and unloading hole 16 is also provided on the pressure chamber top pressure head 14 at a position corresponding to the telescopic loading and unloading arm 23. When disassembling the pressure chamber top pressure head 14, firstly control the driving gear 22 to move so that the telescopic loading and unloading arm 23 is aligned with the top cover loading and unloading hole 16, then control the telescopic loading and unloading arm 23 to extend and penetrate into the top cover loading and unloading hole 16, and then control the driving gear 22 to move so that the driving gear support frame is lifted as a whole, so that the pressure chamber top pressure head 14 can be disassembled.

[0051] As another embodiment of the pressure chamber top pressure head disassembly part of the present invention, the pressure chamber top pressure head lifting control mechanism is as follows Figure 2 The hydraulic cylinder structure shown in the figure is arranged symmetrically with respect to the center of the pressure head 14 at the top of the pressure chamber, including a positioning pressure seat lifting hydraulic cylinder, the positioning pressure seat lifting hydraulic cylinder is arranged with a low cylinder bottom end and a high telescopic end, and the cylinder bottom end of the positioning pressure seat lifting hydraulic cylinder is hingedly mounted on the integral frame 1, and the positioning pressure seat lifting hydraulic cylinder is connected to the hydraulic pump station 2 through a hydraulic pipeline and a control valve group; the positioning pressure seat clamping mechanism is as shown in Figure 2 The bayonet clamping structure shown includes a clamping block hingedly mounted on the telescopic end of the positioning pressure seat lifting hydraulic cylinder, and a limit clamping ring structure is also provided at the position corresponding to the clamping block on the pressure chamber top pressure head 14. When disassembling the pressure chamber top pressure head 14, the positioning pressure seat lifting hydraulic cylinder is controlled to extend so that the clamping block is clamped on the limit clamping ring structure of the pressure chamber top pressure head 14, and then the positioning pressure seat lifting hydraulic cylinder is continued to be controlled to extend. Since the positioning pressure seat lifting hydraulic cylinder is tilted, the force on the clamping block when the positioning pressure seat lifting hydraulic cylinder continues to extend is decomposed into two parts, one part is the clamping force along the radial direction of the pressure chamber top pressure head 14, and the other part is the lifting force along the axial direction of the pressure chamber top pressure head 14, so that the pressure chamber top pressure head 14 can be disassembled.

[0052] In order to avoid the influence of the dynamic load control accuracy when the in-situ disturbance excitation control part is loaded, and to improve the electromagnetic positioning accuracy of the non-contact dynamic solid-liquid separation sensor device 27, as a further improvement scheme of the present invention, a magnetic shielding wrapping layer is provided on the surface of the integral frame 1. The setting of the magnetic shielding wrapping layer can avoid the phenomenon of reduced dynamic load control accuracy caused by the magnetization effect of the electromagnetic field on the integral frame 1 when the in-situ disturbance excitation control part is loaded, and can avoid the phenomenon of reduced positioning accuracy of the non-contact dynamic solid-liquid separation sensor device 27 caused by the magnetization effect of the electromagnetic field on the integral frame 1 when the non-contact dynamic solid-liquid separation sensor device 27 is positioned by the magnetic field positioning component 42.

[0053] In order to accurately obtain the mass data of the leaked rock particles, as a further improvement of the present invention, a drying mechanism is also provided on the solid-liquid separation mechanism of the seepage treatment device 6, that is, the leaked rock particles are dried by the drying mechanism and then weighed by an electronic scale, so that the mass data of the leaked rock particles can be accurately obtained.

[0054] In order to monitor and control the particle loss quality under the condition of maximum particle size and achieve the anti-blocking effect, as a further improvement scheme of the present invention, Fig.10 As shown, a replaceable lost particle size control net 39 is also provided above the lower water permeable plate 11, and the aperture of the lost particle size control net 39 is smaller than the aperture of the water permeable through hole of the lower water permeable plate 11. By replacing the lost particle size control net 39 with different apertures, the maximum particle size of the lost particles can be controlled, and the anti-blocking effect of the lower water permeable plate 11 can be achieved, thereby improving the service life of the lower water permeable plate 11.

[0055] Since the broken rock mass has significant heterogeneity, and the mixed layered arrangement of multiple rock samples underground further exacerbates the heterogeneity of the broken rock mass, in order to facilitate the study of different types of rock samples and the distribution thickness of different types of rock samples under the mixed layered arrangement of multiple rock samples, the relationship between different loading pressures and seepage forms, as a further improvement of the present invention, a main oil cylinder state monitoring sensor 26 electrically connected to the data acquisition module 28 is provided on the loading hydraulic cylinder 3. During the test, the main oil cylinder state monitoring sensor 26 feeds back the output pressure data of the loading hydraulic cylinder 3 to the data acquisition module 28 in real time, and the computer 36 performs error analysis calculation and mean value output on the output pressure data of the loading hydraulic cylinder 3 collected by the data acquisition module 28.

[0056] In order to ensure the stability of the initial pressure of the injected seepage fluid and thereby obtain more accurate test data, as a further improvement scheme of the present invention, the seepage liquid supply control part also includes a seepage pressure stabilizing device 31, and the output end of the seepage fluid pumping device 30 is connected to the liquid inlet 15 through the seepage pressure stabilizing device 31 and the pipeline.

[0057] In order to prevent the obstruction of the flow of the seepage liquid caused by the upper permeable plate 10 and the lower permeable plate 11, as a further improvement scheme of the present invention, Fig.10 As shown, the upper surface and the lower surface of the upper water-permeable plate 10 and the upper surface and the lower surface of the lower water-permeable plate 11 are provided with a plurality of annular grooves and radial grooves connected to the water-permeable through holes, the plurality of annular grooves are concentrically arranged, and the annular grooves are connected by radial grooves arranged along the radial direction; the bottom end of the liquid inlet hole 15 is arranged to be a tapered hole structure with a small top and a large bottom; the inlet end of the seepage outlet channel 5 is provided with a large-diameter port structure.

[0058] In order to make the temperature distribution of the annular rock tube sample 9-5 more uniform, as a further improvement of the present invention, a middle isolation layer 9-3 is provided between the annular rock tube interlayer 9-2 and the annular heating interlayer 9-4. The setting of the middle isolation layer 9-3 can avoid direct contact between the electric heating wire and the annular rock tube sample 9-5, thereby making the temperature distribution of the annular rock tube sample 9-5 more uniform.

[0059] In order to improve the security of the feedback data of the non-contact dynamic solid-liquid separation sensor device 27 and prevent data loss, as a further improvement of the present invention, the data synchronization integrated processing electronic control mechanism 27-7 also includes a sensor data storage device electrically connected to the sensor controller. During the test, each data synchronization integrated processing electronic control mechanism 27-7 feeds back data to the data acquisition module 28 according to the same set time period, and stores the data in the sensor data storage device respectively. After the test is completed, the non-contact dynamic solid-liquid separation sensor device 27 can be taken out to export data, thereby improving the security of the data.

[0060] In order to avoid the influence of the setting of the wires on the data measurement accuracy during the loading test when the non-contact dynamic solid-liquid separation sensor device 27 adopts a wired arrangement, as a further improvement scheme of the present invention, the data synchronization integrated processing electronic control mechanism 27-7 and the data acquisition module 28 are both provided with a wireless transceiver module, and the data synchronization integrated processing electronic control mechanism 27-7 and the data acquisition module 28 are radio connected.

[0061] This broken rock multi-field coupling test and monitoring system can restore the in-situ disturbance load obtained by field testing of geothermal wells, and can accurately obtain the seepage field, temperature field, stress field, strain field and other multi-field coupling test data of collapsed broken rock mass under complex disturbance conditions such as static load, impact load, long-term stable load, periodic pulse and vibration load, and measured disturbance load. It is convenient to study the rock-rock and water-rock heat exchange laws, seepage field distribution laws of broken rock mass, evolution laws of internal stress field of broken rock mass, and multi-field coupling mechanism such as stress field, deformation field, seepage field, temperature field, etc. of complete rock mass lithology, complete rock mass heat source temperature, broken rock mass lithology, particle size, gradation, combined distribution form, etc. under different applied loads, disturbance conditions, initial temperature of seepage fluid, initial pressure of seepage fluid, etc., to provide more accurate test data for the research of deep geothermal mining technology under complex load conditions.

Claims

1. A broken rock mass multi-field coupling test and monitoring system, comprising an integral frame (1), a pressure chamber part, a pressure loading control part, a permeable liquid supply control part and a centralized electrical control part; characterized in that: It also includes an in-situ disturbance excitation control part and a sample internal detection part; The pressure loading control part is fixedly arranged at the inner bottom of the integral frame (1), and comprises a hydraulic pump station (2) and a loading hydraulic cylinder (3); the loading hydraulic cylinder (3) is vertically fixedly arranged on the integral frame (1), and the telescopic end of the loading hydraulic cylinder (3) is vertically protruded upward; the loading hydraulic cylinder (3) is connected to the hydraulic pump station (2) via a hydraulic pipeline and a control valve group; The pressure chamber part comprises a pressure chamber (38) arranged inside the integral frame (1), the pressure chamber (38) comprising a pressure chamber base (4), an interlayer tube wall (9) and a pressure chamber top pressure head (14); the pressure chamber base (4) is coaxially detachably positioned and installed at the top end of the telescopic end of the loading hydraulic cylinder (3) through a pressure chamber base positioning and mounting component, a seepage outlet channel (5) is provided inside the pressure chamber base (4) and is arranged through the pressure chamber base (4), the inlet end of the seepage outlet channel (5) is connected to the top plane of the pressure chamber base (4), the outlet end of the seepage outlet channel (5) is connected to the seepage treatment device (6) through an outlet seepage flow sensor, and the interlayer tube wall (9) is connected to the pressure chamber base (14). ) is coaxially and hermetically fixed on the pressure chamber base (4); the interlayer cylinder wall (9) and the pressure chamber base (4) together form a barrel-shaped structure; the inner part of the interlayer cylinder wall (9) is provided with a rigid heat-conducting inner cylinder wall (9-1), an annular rock cylinder interlayer (9-2), an annular heat-supplying interlayer (9-4) and a rigid heat-insulating outer cylinder wall in sequence from the inside to the outside along its radial direction; a cylinder wall side pressure dynamic sensor is provided on the rigid heat-conducting inner cylinder wall (9-1); the annular rock cylinder sample (9-5) is installed in the annular rock cylinder interlayer (9-2) through an annular rock cylinder interlayer cover (9-6); and the upper and lower ends of the annular rock cylinder sample (9-5) are provided with heat-insulating gaskets (9-7); the annular heat-supplying interlayer (9-4) is provided with a heating interlayer temperature sensor (12) and electric heating wires evenly arranged from bottom to top; the bottom of the inner cavity of the rigid heat-conducting inner tube wall (9-1) is provided with a lower water-permeable plate (11) whose outer diameter size matches the inner diameter size of the rigid heat-conducting inner tube wall (9-1), and the lower water-permeable plate (11) is evenly provided with a plurality of water-permeable through holes connected to the seepage outlet channel (5); the pressure chamber top pressure head (14) is coaxially arranged at the top of the interlayer tube wall (9), and the outer diameter size of the bottom of the pressure chamber top pressure head (14) matches the inner diameter size of the rigid heat-conducting inner tube wall (9-1), and the pressure chamber top pressure head (14) is provided with a liquid inlet hole penetrating the pressure chamber top pressure head (14) (15), and an orifice injection temperature pressure flow sensor (25) is provided at the orifice position of the liquid inlet hole (15), an upper water-permeable plate (10) whose outer diameter size matches the inner diameter size of the rigid heat-conducting inner cylinder wall (9-1) is provided at the bottom end of the pressure chamber top pressure head (14), and a plurality of water-permeable through holes connected to the liquid inlet hole (15) are evenly distributed on the upper water-permeable plate (10), a concave spherical structure is provided at the symmetrical center position of the top of the pressure chamber top pressure head (14), and a DC excitation coil (17) is provided at the top of the pressure chamber top pressure head (14); the seepage treatment device (6) includes a solid-liquid separation mechanism, and an electronic scale for weighing the discharged sample rock particles is provided on the solid-liquid separation mechanism; The permeate liquid supply control part comprises a permeate liquid pumping device (30) and a permeate liquid pumping electric control device (32) electrically connected to the permeate liquid pumping device (30); the input end of the permeate liquid pumping device (30) is connected to the permeate liquid supply box (29) through a pipeline; the output end of the permeate liquid pumping device (30) is connected to the input end of the inlet liquid heating device (40) through a pipeline; the output end of the inlet liquid heating device (40) is connected to the liquid inlet hole (15) through the inlet liquid temperature control device (41) and the pipeline; The in-situ disturbance excitation control part comprises a disturbance signal execution device and a disturbance signal excitation electric control device (35); the disturbance signal execution device comprises a positioning pressure head (21), the positioning pressure head (21) is vertically installed on the integral frame (1) at a position corresponding to the pressure head (14) on the top of the pressure chamber, and a positioning pressure head lifting structure is provided on the positioning pressure head (21), the bottom end of the positioning pressure head (21) is a convex spherical structure arranged to match the concave spherical structure on the top of the pressure head (14) on the top of the pressure chamber, an AC excitation coil (20) is provided on the positioning pressure head (21), and an in-situ disturbance dynamic pressure sensor (19) is also provided on the positioning pressure head (21) or the pressure head (14) on the top of the pressure chamber; the disturbance signal excitation electric control device (35) comprises a controllable AC excitation module (34) and a DC power supply module (33), the controllable AC excitation module (34) is electrically connected to the AC excitation coil (20), and the DC power supply module (33) is electrically connected to the DC excitation coil (17); The sample internal detection part comprises a plurality of non-contact dynamic solid-liquid separation sensing devices (27) arranged in the barrel-shaped structure of the pressure chamber part and a magnetic field positioning component (42) arranged on the rigid heat-conducting inner barrel wall (9-1); the non-contact dynamic solid-liquid separation sensing device (27) comprises a supporting fixed skeleton (27-1) forming a square three-dimensional frame structure and a solid-liquid separation rigid isolation net (27-2) wrapped around the supporting fixed skeleton (27-1), and the square three-dimensional frame structure is divided into a first part and a second part respectively centered on the vertices and having three spatially adjacent faces, with two vertices of the square three-dimensional frame structure being used as reference points. The invention relates to a method for manufacturing a square stereoscopic frame structure having two parts, wherein the supporting and fixing frame (27-1) of the first part is a rigid supporting and fixing frame, and an electronic gyroscope (27-3), a sample water pressure sensor (27-4), a sample temperature sensor (27-5), a space electromagnetic positioning sensor (27-6), and a data synchronization integrated processing electric control mechanism (27-7) are fixedly arranged on the inner surface of the rigid supporting and fixing frame, and the space electromagnetic positioning sensor (27-6) is positioned at the spatial geometric center of the square stereoscopic frame structure, and the data synchronization integrated processing electric control mechanism (27-7) includes a sensor controller, a sensor data storage device, and a power supply circuit, and the sensor controller is respectively connected to the sensor data storage device, the electric control device, and the sensor data storage device. The sub-gyroscope (27-3), the sample water pressure sensor (27-4), the sample temperature sensor (27-5), and the space electromagnetic positioning sensor (27-6) are electrically connected, and the data synchronization integrated processing electronic control mechanism (27-7) is also provided with a wireless transceiver module. The second part of the support and fixed frame (27-1) is an elastic support and fixed frame. The outer surfaces of the three adjacent surfaces of the elastic support and fixed frame are respectively provided with space three-dimensional stress sensors (27-8), and the inner surface of the elastic support and fixed frame is fixed with stress test demodulators (27-9) electrically connected to the three-dimensional stress sensors (27-8). The stress test demodulator (27-9) is fixed with the inner surface of the elastic support and fixed frame. 9) is electrically connected to the sensor controller of the data synchronous integrated processing electric control mechanism (27-7), and the adjacent rigid support fixed frame and the elastic support fixed frame are fixedly installed and connected to form an overall square three-dimensional frame structure; the magnetic field positioning component (42) includes an upper magnetic field positioning component fixedly arranged in the top plane of the rigid heat-conducting inner cylinder wall (9-1) and a lower magnetic field positioning component fixedly arranged in the bottom plane of the rigid heat-conducting inner cylinder wall (9-1), the upper magnetic field positioning component and the lower magnetic field positioning component are respectively arranged as two pieces arranged along the radial direction of the rigid heat-conducting inner cylinder wall (9-1), and the connection line of the two upper magnetic field positioning components is vertically arranged in space with the connection line of the two lower magnetic field positioning components; The centralized electric control part comprises a computer (36), a data acquisition module (28), a pressure loading control circuit, a temperature control circuit, a liquid injection control circuit, an in-situ disturbance excitation control circuit, a sample internal detection control circuit, and a data analysis and calculation circuit. The computer (36) is electrically connected to the hydraulic pump station (2), the seepage pumping electric control device (32), the inlet liquid temperature control device (41), the disturbance signal excitation electric control device (35), the data acquisition module (28), the magnetic field positioning component (42), and the electric heating wire of the annular heating interlayer (9-4). The data acquisition module (28) is electrically connected to the orifice injection temperature pressure flow sensor (25), the outlet seepage flow sensor, the cylinder wall side pressure dynamic sensor, the heating interlayer temperature sensor (12), the in-situ disturbance dynamic pressure sensor (19), and the electronic scale of the seepage treatment device (6). The data acquisition module (28) is also provided with a wireless transceiver module. The data acquisition module (28) is wirelessly connected to the data synchronization integrated processing electric control mechanism (27-7).

2. The broken rock mass multi-field coupling test and monitoring system according to claim 1 is characterized in that: The bottom of the sandwich tube wall (9) is detachably fixedly mounted on the pressure chamber base (4); the broken rock mass multi-field coupling test and monitoring system also includes a pressure chamber top pressure head disassembly part, which includes a pressure chamber top pressure head lifting control mechanism arranged on the integral frame (1) and a positioning pressure seat clamping mechanism installed on the pressure chamber top pressure head lifting control mechanism, the positioning pressure seat clamping mechanism is used to clamp and position the pressure chamber top pressure head (14) when the pressure chamber top pressure head (14) is removed after the test is completed, the pressure chamber top pressure head lifting control mechanism is used to lift the pressure chamber top pressure head (14) when the pressure chamber top pressure head (14) is removed after the test is completed, and the pressure chamber top pressure head lifting control mechanism and the positioning pressure seat clamping mechanism are respectively electrically connected to the computer (36).

3. The broken rock mass multi-field coupling test and monitoring system according to claim 2 is characterized in that: The pressure chamber top pressure head lifting control mechanism is a gear rack structure symmetrically arranged relative to the center of the pressure chamber top pressure head (14), comprising a rack guide rail (24) and a driving gear (22), wherein the rack guide rail (24) is vertically fixedly mounted on the integral frame (1), a driving gear (22) having a driving motor is meshingly arranged on the rack guide rail (24), and the driving gear (22) is mounted on the integral frame (1) through a driving gear support frame in a vertical sliding direction, and a horizontal limit structure is provided between the driving gear support frame and the integral frame (1) to limit the driving gear support frame from separating from the integral frame (1); the positioning pressure seat clamping mechanism is a horizontal telescopic clamping structure, comprising a telescopic loading and unloading arm (23) horizontally mounted on the driving gear support frame, and a top cover loading and unloading hole (16) is also provided at a position on the pressure chamber top pressure head (14) corresponding to the telescopic loading and unloading arm (23).

4. The broken rock mass multi-field coupling test and monitoring system according to claim 2 is characterized in that: The pressure chamber top pressure head lifting control mechanism is a hydraulic cylinder structure symmetrically arranged relative to the center of the pressure chamber top pressure head (14), including a positioning pressure seat lifting hydraulic cylinder, the positioning pressure seat lifting hydraulic cylinder is tilted with a low cylinder bottom end and a high telescopic end, the cylinder bottom end of the positioning pressure seat lifting hydraulic cylinder is hingedly mounted on the integral frame (1), and the positioning pressure seat lifting hydraulic cylinder is connected to the hydraulic pump station (2) through a hydraulic pipeline and a control valve group; the positioning pressure seat clamping mechanism is a bayonet clamping structure, including a clamping block hingedly mounted on the telescopic end of the positioning pressure seat lifting hydraulic cylinder, and a limit clamping ring structure is also provided at the position of the pressure chamber top pressure head (14) corresponding to the clamping block.

5. The broken rock mass multi-field coupling test and monitoring system according to any one of claims 1 to 4, characterized in that: A magnetic shielding wrapping layer is provided on the surface of the integral frame (1).

6. The broken rock mass multi-field coupling test and monitoring system according to any one of claims 1 to 4, characterized in that: The solid-liquid separation mechanism of the seepage treatment device (6) is also provided with a drying mechanism.

7. The broken rock mass multi-field coupling test and monitoring system according to any one of claims 1 to 4, characterized in that: A replaceable lost particle size control net (39) is also provided above the lower water permeable plate (11), and the aperture of the lost particle size control net (39) is smaller than the aperture of the water permeable through hole of the lower water permeable plate (11).

8. The broken rock mass multi-field coupling test and monitoring system according to any one of claims 1 to 4, characterized in that: A middle isolation layer (9-3) is also provided between the annular rock tube interlayer (9-2) and the annular heating interlayer (9-4).

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