Multifunctional pressure head and pressure box for rock physics and mechanics testing in deep earth, deep space and deep sea environments

Abstract

The present invention relates to a multifunctional pressure head and a pressure box for testing the physics and mechanics of rocks in deep earth, deep space and deep sea environments. The front end of the multifunctional pressure head is provided with a plurality of evenly arranged permeable holes, and a seepage fluid channel is provided inside the multifunctional pressure head, one end of the seepage fluid channel is connected with the plurality of permeable holes; the front end of the multifunctional pressure head is provided with an acoustic emission probe and / or an ultrasonic probe; the front end of the multifunctional pressure head is provided with a temperature sensor and / or a heat flow sensor. The multifunctional pressure head of the present application integrates an acoustic emission probe, a temperature sensing function, a heat flow sensing function and a seepage function, and can realize real-time monitoring of microseismic signals during rock mass fracture, real-time monitoring of the surface temperature of the sample during the experiment and measurement of heat flow, and it integrates multiple functions in one, and is powerful; the present application can monitor the three-way deformation of the sample in real time; the unique three-way sealing structure of the present application can effectively seal the test sample, prevent the seepage fluids of adjacent surfaces from communicating with each other, and improve the accuracy of the experiment.

Description

Technical Field

[0001] The present invention relates to the field of rock mechanics experimental technology, and in particular to a multifunctional pressure head and a pressure box for rock physics and mechanics testing in deep earth, deep space and deep sea environments. Background Art

[0002] As the demand for resources increases, shallow resources on Earth have gradually dried up. However, the deep earth, deep space, and deep sea contain a large amount of resources and energy. Due to the unknowns and lack of scientific theories in the deep earth, deep space, and deep sea, related engineering practices and industrial safety face huge challenges.

[0003] The deep rock mass physical and mechanical test is carried out on rocks with geological structures. The purpose is to analyze the geological structure, rock strength and stress of different types of rock masses in order to formulate mining methods, which is of great significance to the safety of mining projects.

[0004] For deep mineral resource mining, carbon dioxide geological storage, underground space development, geothermal development projects, the stress environment is a true triaxial stress state due to the effects of tectonic stress, mining disturbance, storage environment, formation stress, reservoir water environment, etc. At present, the main monitoring parameter under true triaxial stress is the deformation of the sample, and it is difficult to achieve simultaneous monitoring of sound and temperature, and it is difficult to meet the seepage test. Summary of the invention

[0005] In order to solve the above technical problems, the present application provides a multifunctional pressure head and pressure box for rock physics and mechanics testing in deep earth, deep space and deep sea environments.

[0006] This application is implemented through the following technical solutions:

[0007] The multifunctional pressure head for rock physics and mechanics testing in deep earth, deep space and deep sea environments provided in the present application has a plurality of evenly arranged permeability holes at the front end thereof, a seepage fluid channel is provided inside the multifunctional pressure head, one end of the seepage fluid channel is connected to the plurality of permeability holes; an acoustic emission probe and / or an ultrasonic probe is provided at the front end thereof; a temperature sensor and / or a heat flow sensor is provided at the front end thereof.

[0008] Optionally, the multifunctional pressure head has a through hole in the center that passes through the front end surface, a thermal pad is installed at the front end of the through hole, and a temperature and heat flow integrated probe is installed at the rear end of the through hole, and the temperature is transferred to the temperature and heat flow integrated probe through the thermal pad; a sealing ring is provided between the thermal pad and the hole wall of the multifunctional pressure head.

[0009] Optionally, the front end of the multifunctional pressure head is provided with an acoustic emission probe mounting hole and an ultrasonic probe mounting hole; the acoustic emission probe and the ultrasonic probe are correspondingly installed in the acoustic emission probe mounting hole and the ultrasonic probe mounting hole, and there is a sealing ring between the acoustic emission probe and the ultrasonic probe and the hole wall of the pressure head body.

[0010] In particular, the front end of the multifunctional pressure head is provided with an annular sealing groove, and the plurality of penetration holes are located inside the annular sealing groove; a sealing fluid injection channel is provided inside the multifunctional pressure head, and one end of the sealing fluid injection channel is connected with the annular sealing groove; an annular sealing strip is installed or not installed in the annular sealing groove, and the annular sealing strip has an annular groove.

[0011] In particular, the multifunctional pressure head comprises a pressure head body and a permeable pad, the annular sealing groove is integrally manufactured at the front end edge of the pressure head body, the sealing fluid injection channel and the seepage fluid channel are arranged in the pressure head body, and the other ends of the sealing fluid injection channel and the seepage fluid channel pass through the outer side surface of the pressure head body;

[0012] The front end of the pressure head body is provided with an integrally manufactured rectangular convex portion, the rectangular convex portion is located within the inner periphery of the annular sealing groove, the front end surface of the rectangular convex portion is provided with an integrally manufactured embedded groove, one end of the seepage fluid channel passes through the embedded groove; the permeable pad is embedded in the embedded groove, the plurality of permeable holes are provided on the permeable pad, and the permeable holes pass through the permeable pad from front to back.

[0013] Optionally, the permeable pad is provided with a plurality of circles of permeable holes at equal intervals from the inside to the outside, each circle is concentrically arranged with the center of the permeable pad as the center, and each circle has a plurality of permeable holes arranged at equal intervals along the circumferential direction; the back of the permeable pad has a plurality of circular grooves and a plurality of radial straight grooves, the plurality of circles of permeable holes are respectively located on one of the circular grooves and are connected with the corresponding circular grooves, the radial straight grooves are connected with the plurality of circular grooves, and the plurality of radial straight grooves are arranged at equal intervals along the circumferential direction; one end of the seepage fluid channel is opposite to one of the circular grooves and / or the radial straight grooves.

[0014] The multifunctional pressure box for rock physics and mechanics testing in deep earth, deep space and deep sea environments provided in the present application includes 6 multifunctional pressure heads, and the 6 multifunctional pressure heads are located in pairs in the X-axis direction, the Y-axis direction and the Z-axis direction;

[0015] When an ultrasonic probe is provided at the front end of the multifunctional pressure head, the ultrasonic probe on one of the multifunctional pressure heads in the same axial direction is an ultrasonic transmitting probe, and the ultrasonic probe on the other multifunctional pressure head opposite thereto is an ultrasonic receiving probe;

[0016] The six multifunctional pressing heads are connected together with or without an elastic sheet. When the six multifunctional pressing heads are connected together with an elastic sheet, each multifunctional pressing head is connected to four multifunctional pressing heads on its four sides through an elastic sheet respectively.

[0017] Optionally, the multifunctional pressure box for rock physics and mechanics testing in deep earth, deep space and deep sea environments further comprises a sample fixture, wherein the sample fixture comprises a rigid outer cubic frame and a flexible inner cubic frame, wherein the rigid outer cubic frame and the flexible inner cubic frame both have 12 frame edges, and the six faces of the rigid outer cubic frame and the flexible inner cubic frame are all rectangular frames;

[0018] The flexible inner cubic frame can be loaded with a cubic sample, each face of the flexible inner cubic frame has an integrally manufactured annular flange, and the 12 outer corners of the flexible inner cubic frame are aligned with the 12 inner corners of the rigid outer cubic frame;

[0019] The front ends of the six multifunctional pressing heads can be operably extended into the sample clamp from the frame openings in six directions of the sample clamp, and the annular flange is correspondingly inserted into the annular sealing groove of the multifunctional pressing head. An annular sealing strip is provided between the two, and the annular flange is inserted into the annular groove of the annular sealing strip.

[0020] In particular, at least one displacement detection device is provided between the two multifunctional pressing heads in the X-axis direction; at least one displacement detection device is provided between the two multifunctional pressing heads in the Y-axis direction; and at least one displacement detection device is provided between the two multifunctional pressing heads in the Z-axis direction.

[0021] Optionally, the displacement detection device includes a displacement sensor, an extensometer rod and two sensor connecting arms, the sensor connecting arms are respectively fixed on two multifunctional pressure heads in the same axial direction, one end of the displacement sensor is connected to one of the sensor connecting arms, one end of the extensometer rod is connected to the other sensor connecting arm, and the other end of the displacement sensor is connected to or in contact with the other end of the extensometer rod.

[0022] Compared with the prior art, this application has the following beneficial effects:

[0023] 1. The multifunctional pressure head of the present application integrates an acoustic emission probe, a temperature sensing function, a heat flow sensing function, and a seepage function, and can be used for seepage testing, can realize real-time monitoring of microseismic signals during rock mass fracture, can realize real-time monitoring of the sample surface temperature during the experiment, and can measure heat flow. It integrates multiple functions in one and can be used for multi-parameter measurement;

[0024] 2. The three-dimensional deformation of the sample can be monitored in real time through the displacement detection device;

[0025] 3. The unique three-way sealing structure of the present application can effectively seal the test sample, prevent the seepage fluid from adjacent surfaces from communicating with each other, and improve the accuracy of the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the embodiments of the present application, constitute a part of the present application, and do not constitute a limitation on the embodiments of the present invention.

[0027] Figure 1 is a three-dimensional diagram of the multifunctional pressing head in the embodiment;

[0028] Figure 2 is a front view of the multifunctional pressing head in the embodiment;

[0029] Figure 3 yes Figure 2 Sectional view at AA in the middle;

[0030] Figure 4 yes Figure 2 Sectional view at the middle BB;

[0031] Figure 5 is a three-dimensional diagram of the indenter body in the embodiment;

[0032] Figure 6 is a three-dimensional image of the penetration pad in the first viewing angle in the embodiment;

[0033] Figure 7 is a three-dimensional image of the penetration pad in the second viewing angle of the embodiment;

[0034] Figure 8 is a three-dimensional diagram of the multifunctional pressure box in the embodiment;

[0035] Fig. 9 is a front view of the multifunctional pressure box in the embodiment;

[0036] Fig.10 yes Fig. 9 Sectional view at EE;

[0037] Fig.11 yes Fig. 9 Cross-sectional view at FF;

[0038] Fig.12 is a three-dimensional diagram of the sample fixture in the embodiment;

[0039] Fig.13 is a cross-sectional view of a sample fixture in an embodiment;

[0040] Fig.14 is a three-dimensional diagram of the flexible inner cube frame of an embodiment;

[0041] Fig.15 is a cross-sectional view of the flexible inner cubic frame of the embodiment;

[0042] Fig.16 It is a three-dimensional diagram of the multifunctional pressure box when the displacement detection device is installed in the embodiment. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0045] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

[0046] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0047] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, 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 cannot be understood as a limitation on the present invention.

[0048] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] like Figure 1-Figure 4As shown, the multifunctional pressure head 100 for rock physical and mechanical testing in deep earth, deep space and deep sea environments disclosed in this embodiment has a front end of the multifunctional pressure head 100 with a plurality of evenly arranged permeability holes 21, and a seepage fluid channel 14 is provided inside the multifunctional pressure head 100, and one end of the seepage fluid channel 14 is connected to the plurality of permeability holes 21.

[0050] The front end of the multifunctional pressing head 100 is provided with an acoustic emission probe 41 and / or an ultrasonic probe 42, and the front end of the multifunctional pressing head 100 is provided with a high temperature and high pressure resistant temperature sensor and / or a heat flow sensor (not shown in the figure), which can monitor the temperature and heat flow of the sample surface in real time.

[0051] In a possible design, the temperature sensor and the heat flow sensor are integrated in one probe row, and a temperature and heat flow integrated probe (not shown) is installed at the front end of the multifunctional press head 100 to monitor the temperature and heat flow of the sample surface in real time.

[0052] In a possible design, the multifunctional pressure head 100 has a through hole in the center that passes through the front end surface, a thermal pad 43 is installed at the front end of the through hole, and a temperature and heat flow integrated probe is installed at the rear end of the through hole, and the temperature is transferred to the temperature and heat flow integrated probe through the thermal pad 43.

[0053] In a possible design, the front end of the multifunctional pressure head 100 is provided with an annular sealing groove 11, and the plurality of penetration holes 21 are located inside the annular sealing groove 11; a sealing fluid injection channel 13 is provided inside the multifunctional pressure head 100, and one end of the sealing fluid injection channel 13 is connected with the annular sealing groove 11; an annular sealing strip 3 may or may not be installed inside the annular sealing groove 11, and the annular sealing strip 3 has an annular groove.

[0054] In a possible design, the multifunctional pressure head 100 includes a pressure head body 1 and a permeable pad 2. Figure 5 As shown, the annular groove 11 is integrally manufactured at the front end of the pressure head body 1, and the front end of the pressure head body 1 has an integrally manufactured rectangular convex portion 12, which is located inside the annular groove 11. The sealing fluid injection channel 13 and the seepage fluid injection channel 14 are arranged in the pressure head body 1, and one end of the sealing fluid injection channel 13 is connected to the annular groove 11, and the other end passes through the outer side of the pressure head body 1. The front end surface of the rectangular convex portion 12 has an integrally manufactured embedded groove 15, and one end of the seepage fluid injection channel 14 passes through the embedded groove 15, and the other end passes through the outer side of the pressure head body 1, and the permeable pad 2 is embedded in the embedded groove 15 by screws.

[0055] like Figure 3 , Figure 4 As shown, a plurality of penetration holes 21 are provided on the penetration pad 2, and the penetration holes 21 penetrate the penetration pad 2 from front to back. The external seepage fluid flows into the embedded groove 15 through the seepage fluid injection channel 14 and then flows evenly toward the sample through the plurality of penetration holes 21.

[0056] In one possible design, Figure 6 , Figure 7 As shown, a plurality of circles of penetration holes 21 are evenly spaced from the inside to the outside of the penetration pad 2, and each circle is concentrically arranged with the center of the penetration pad 2 as the center of the circle. Each circle has a plurality of penetration holes 21 evenly spaced along the circumferential direction.

[0057] In particular, there are multiple circular grooves 23 and multiple radial straight grooves 24 on the back of the penetration pad 2, and the multiple circles of penetration holes 21 are respectively located on one of the circular grooves 23 and penetrate the corresponding circular grooves 23. The radial straight grooves 24 penetrate multiple circular grooves 23, and the multiple radial straight grooves 24 are arranged at equal intervals along the circumferential direction.

[0058] It is worth noting that the diameter and number of the penetration holes 21, as well as the number of the circular grooves 23 and the radial straight grooves 24 are reasonably set as needed. In a possible design, there are 4 radial straight grooves 24 and 5-7 circular grooves 23.

[0059] In one possible design, Figure 3-Figure 5 As shown, the front end of the pressure head body 1 is provided with an acoustic emission probe mounting hole 16, and the penetration pad 2 also has an adapted hole at the position corresponding to the acoustic emission probe. The acoustic emission probe 41 is installed in the acoustic emission probe mounting hole 16, and a sealing ring 45 is provided between the acoustic emission probe 41 and the hole wall of the pressure head body 1. In particular, three acoustic emission probes 41 are provided at the front end of the multifunctional pressure head 100, and the three acoustic emission probes 41 are arranged at equal intervals in the circumferential direction with the center of the multifunctional pressure head 100 as the center of the circle.

[0060] In a possible design, two high temperature and high pressure resistant ultrasonic probes 42 are mounted on the multifunctional pressure head 100, one of which is a P wave and the other is an S wave. An ultrasonic probe mounting hole 17 is provided at the front end of the pressure head body 1, and the ultrasonic probe 42 is mounted in the ultrasonic probe mounting hole 17, and a sealing ring 45 is provided between the ultrasonic probe 42 and the hole wall of the pressure head body 1.

[0061] In a possible design, a hole 22 adapted to the thermal pad 43 is provided at the front end of the pressure head body 1 and the center of the penetration pad 2, and the thermal pad 43 is installed in the hole. In particular, a sealing ring 45 is provided between the thermal pad 43 and the hole wall of the pressure head body 1.

[0062] To facilitate wiring, a through hole 10 is provided in the center of the pressure head body 1. The acoustic emission probe mounting hole 16 and the ultrasonic probe mounting hole 17 are both connected to the through hole 10. A wiring hole 18 is provided on the side wall of the pressure head body 1. The wiring hole 18 is connected to the through hole 10. The cables of components such as the temperature and heat flow integrated probe, the acoustic emission probe 41 and the ultrasonic probe 42 are led out through the wiring hole 18 and connected to the external data monitoring system.

[0063] In a possible design, the sealing fluid injection channel 13 and the seepage fluid injection channel 14 are both L-shaped.

[0064] In order to facilitate docking with external components, a docking port 19 is provided at the center of the rear end of the pressure head body 1.

[0065] In one possible design, the multifunctional pressing head 100 is rectangular.

[0066] like Figure 8-Figure 11 As shown, the multifunctional pressure box for deep earth, deep space and deep sea environment rock physics and mechanics testing disclosed in this embodiment includes a sample fixture 200 and 6 multifunctional pressure heads 100, and the 6 multifunctional pressure heads 100 are arranged in pairs in the X-axis, Y-axis and Z-axis directions of the three-axis coordinate system. The 6 multifunctional pressure heads 100 can contact the 6 surfaces of the cubic sample 400 respectively, which is conducive to uniformly transmitting the pressure to the sample.

[0067] The ultrasonic probe 42 on one of the multifunctional pressing heads 100 in the same axial direction of the multifunctional pressure box 100 is an ultrasonic transmitting probe, and the ultrasonic probe 42 on the other opposite multifunctional pressing head 100 is an ultrasonic receiving probe.

[0068] like Fig.12 , 13 As shown, the sample fixture 200 is used to fix the cubic sample 400, and at the same time, openings adapted to the six multifunctional pressing heads 100 need to be reserved in six directions.

[0069] In a possible design, the sample holder 200 includes a rigid outer cubic frame 201 and a flexible inner cubic frame 202 . The rigid outer cubic frame 201 has 12 rigid frame edges, and the six faces of the rigid outer cubic frame 201 are all rectangular frames.

[0070] The cube sample 400 can be loaded into the flexible inner cube frame 202. The flexible inner cube frame 202 also has 12 frame edges 2021, and the six faces of the flexible inner cube frame 202 are all rectangular frames. The flexible inner cube frame 202 is manufactured in one piece.

[0071] In one possible design, Fig.14 , Fig.15 As shown, each face of the flexible inner cubic frame 202 has an integrally manufactured annular flange 2022, and the annular flange 2022 is adapted to the annular sealing groove 11 of the press head body 1, and is used to fit tightly with the press head body 1. Figure 3 , Figure 4 As shown, the annular sealing strip 3 has an inner groove adapted to the annular flange 2022 , and the annular flange 2022 is installed in the inner groove of the annular sealing strip 3 .

[0072] The 12 outer corner positions 2023 of the flexible inner cubic frame 202 fit with the 12 inner corner positions of the rigid outer cubic frame 201. In a possible design, the 12 inner corner positions of the flexible inner cubic frame 202 have right-angle side structures 2024 that match the corners of the cubic sample 400.

[0073] In a possible design, the multifunctional pressing head 100 is matched with the rectangular frame opening of the rigid outer cubic frame 201 , and the two can be kept relatively fixed by friction. The rectangular protrusion 12 is matched with the rectangular frame opening of the flexible inner cubic frame 202 .

[0074] In one possible design, Fig.16 As shown, 6 multifunctional pressing heads 100 are connected together by 12 elastic sheets 300, and each multifunctional pressing head 100 is connected to 4 multifunctional pressing heads 100 around it by an elastic sheet 300. Of course, in another possible design, more elastic sheets 300 can be used to connect the 6 multifunctional pressing heads 100 together.

[0075] Optional, such as Figure 3 As shown, the rear end of the multifunctional pressing head 100 is surrounded by screw holes adapted to the elastic sheet 300, and the two ends of the elastic sheet 300 are respectively connected to the two multifunctional pressing heads 100 by screws. When assembled with the sample fixture 200, the elastic sheet 300 is located outside the sample fixture 200.

[0076] In a possible design, the multifunctional pressing head 100 is made of a high-rigidity alloy material and has sufficient rigidity; the flexible inner cubic frame 202 is a wear-resistant, pressure-resistant and high-strength rubber frame, and the rigid outer cubic frame 201 is a metal frame; the elastic sheet 300 is a highly elastic metal sheet.

[0077] In a possible design, a cube sample 400 of 100*100*100 mm can be loaded into the flexible inner cube frame 202 .

[0078] In one possible design, Fig.16 As shown, at least one displacement detection device 500 is provided between the two multifunctional pressing heads 100 in the X-axis direction; at least one displacement detection device 500 is provided between the two multifunctional pressing heads 100 in the Y-axis direction; and at least one displacement detection device 500 is provided between the two multifunctional pressing heads 100 in the Z-axis direction, so that deformation monitoring of the sample in the three directions of X, Y and Z can be performed.

[0079] Optionally, two displacement detection devices 500 are provided between each pair of multifunctional pressing heads 100 in the X-axis direction and the Y-axis direction, and the two displacement detection devices 500 are respectively installed at the diagonal positions of each pair of multifunctional pressing heads 100, so as to realize the accurate measurement of the deformation of the sample in the X-axis and Y-axis directions, with a maximum deformation of ±5 mm and an accuracy of ±0.5%FS. Three displacement detection devices 500 are provided between each pair of multifunctional pressing heads 100 in the Z-axis direction, respectively at the three angular positions of each pair of multifunctional pressing heads 100, so as to realize the accurate measurement of the deformation of the sample in the Z-axis direction, with a maximum deformation of ±5 mm and an accuracy of ±0.5%FS. The displacement detection device 500 fixed to the side of the multifunctional pressing head 100 can monitor the three-dimensional deformation of the sample in real time.

[0080] In a possible design, the displacement detection device 500 includes a displacement sensor 501, an extensometer rod 502 and two sensor connecting arms 503, the sensor connecting arms 503 are respectively fixed on two multifunctional pressure heads 100 in the same axial direction, one end of the displacement sensor 501 is connected to one of the sensor connecting arms 503, one end of the extensometer rod 502 is connected to the other sensor connecting arm 503, and the other end of the displacement sensor 501 is connected to or in contact with the other end of the extensometer rod 502.

[0081] In a possible design, the displacement sensor 501 is an LVDT sensor. When the sample is deformed, the two multifunctional pressure heads 100 move toward each other, and the extensometer rod 502 pushes the displacement sensor 501 to retract it, so that the deformation of the sample is detected by the displacement sensor 501.

[0082] In a possible design, three sets of high-temperature and high-pressure acoustic emission probes are preset at the front end of each multifunctional pressure head 100, with a sampling frequency of 20-1200kHz and 10Hz, so as to realize real-time monitoring of microseismic signals during rock mass fracture. Optionally, two sets of high-temperature and high-pressure acoustic emission probes are integrated with ultrasonic detection functions, one for each P wave and one for each S wave, so as to realize real-time monitoring of ultrasonic waves during the experiment.

[0083] The working principle of the multifunctional pressure box in this embodiment:

[0084] Install the sample: place the cubic sample 400 in the flexible inner cubic frame 202 of the sample fixture 200, and the front ends of the six multifunctional pressing heads 100 extend from the frame openings in six directions of the sample fixture 200 to contact the surface of the cubic sample 400; the annular flanges 2022 in six directions of the flexible inner cubic frame 202 are correspondingly inserted into the annular sealing grooves 11 of the six multifunctional pressing heads 100.

[0085] Three-way sealing: high-pressure sealing fluid is injected into the annular sealing groove 11 through the sealing fluid injection channels 13 inside the six multifunctional pressure heads 100, so that the annular sealing strip 3 and the flexible inner cubic frame 202 are closely fitted, and the 12 edges of the cubic sample 400 are closely fitted with the flexible inner cubic frame 202, so that the 12 edges of the cubic sample 400 can be sealed to each other;

[0086] True triaxial stress loading: 6 actuators are used to apply axial forces to 6 multifunctional pressing heads 100 respectively, and the deformation of the sample is monitored by the displacement detection device 500 during the loading process;

[0087] Seepage: connect the seepage system, inject the seepage fluid through the seepage fluid channel 14 of one of the multifunctional pressure heads 100 on the same axis, and the seepage fluid flows evenly to the cubic sample 400 through the penetration pad 2; the seepage fluid channel 14 of another multifunctional pressure head 100 on the same axis serves as the seepage fluid outlet, and a flow meter can be provided at the seepage fluid outlet; the 12 edges of the cubic sample 400 are sealed to each other, which can prevent the fluids at the edges of the cubic sample 400 from circulating with each other; it is worth noting that the seepage pressure should be less than the sealing pressure.

[0088] During this process, the acoustic emission, sound wave, temperature, displacement and other monitoring systems are turned on to monitor and record the acoustic emission, ultrasonic wave, temperature, deformation and other data of the sample in real time.

[0089] It is worth noting that when measuring the permeability in a single Z direction, the seepage fluid channels in the X and Y directions are closed to allow the fluid to enter from the Z direction and flow out from the Z direction; when measuring the X and Y directions, the same operation can be performed to complete the real-time monitoring of the three-way permeability.

[0090] The above specific implementation methods further illustrate the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above are only specific implementation methods of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Multifunctional pressure box for rock physics and mechanics testing in deep earth, deep space and deep sea environments, characterized by: It includes a multifunctional pressing head (100) and a sample fixture (200); The front end of the multifunctional pressure head (100) is provided with a plurality of evenly arranged permeation holes (21), and a permeation fluid channel (14) is provided inside the multifunctional pressure head (100), wherein one end of the permeation fluid channel (14) is in communication with the plurality of permeation holes (21); The front end of the multifunctional pressure head (100) is provided with an acoustic emission probe (41) and / or an ultrasonic probe (42); The front end of the multifunctional pressure head (100) is provided with a temperature sensor and / or a heat flow sensor; There are six multifunctional pressing heads (100), and the six multifunctional pressing heads (100) are located in pairs in the X-axis direction, the Y-axis direction, and the Z-axis direction; when an ultrasonic probe (42) is provided at the front end of the multifunctional pressing head (100), the ultrasonic probe (42) on one of the multifunctional pressing heads (100) in the same axial direction is an ultrasonic transmitting probe, and the ultrasonic probe (42) on the other multifunctional pressing head (100) opposite thereto is an ultrasonic receiving probe; The six multifunctional pressing heads (100) are connected together with or without an elastic sheet (300); when the six multifunctional pressing heads (100) are connected together with an elastic sheet (300), the four sides of each multifunctional pressing head (100) are connected to the four multifunctional pressing heads (100) on the four sides respectively through an elastic sheet (300); The sample fixture (200) comprises a rigid outer cubic frame (201) and a flexible inner cubic frame (202), wherein the rigid outer cubic frame (201) and the flexible inner cubic frame (202) each have 12 frame edges, and the six faces of the rigid outer cubic frame (201) and the flexible inner cubic frame (202) are all rectangular frames; The cube sample (400) can be placed in the flexible inner cube frame (202), and the 12 outer corner positions (2023) of the flexible inner cube frame (202) fit with the 12 inner corner positions of the rigid outer cube frame (201); Each face of the flexible inner cubic frame (202) has an integrally manufactured annular flange (2022); The front ends of the six multifunctional pressing heads (100) can be operably extended into the sample clamp (200) from the frame openings in six directions of the sample clamp (200), and the annular flanges (2022) are correspondingly inserted into the annular sealing grooves (11) of the multifunctional pressing heads (100), an annular sealing strip (3) is provided between the two, and the annular flanges (2022) are inserted into the annular grooves of the annular sealing strips (3).

2. The multifunctional pressure box for rock physics and mechanics testing in deep earth, deep space and deep sea environments according to claim 1 is characterized by: The multifunctional pressure head (100) has a through hole in the center that passes through the front end surface, a thermal pad (43) is installed at the front end of the through hole, and a temperature and heat flow integrated probe is installed at the rear end of the through hole, and the temperature is transmitted to the temperature and heat flow integrated probe through the thermal pad (43); A sealing ring (45) is provided between the thermally conductive pad (43) and the hole wall of the multifunctional pressing head (100).

3. The multifunctional pressure box for rock physics and mechanics testing in deep earth, deep space and deep sea environments according to claim 1 is characterized by: The front end of the multifunctional pressure head (100) is provided with an acoustic emission probe mounting hole (16) and an ultrasonic probe mounting hole (17); The acoustic emission probe (41) and the ultrasonic probe (42) are mounted in the acoustic emission probe mounting hole (16) and the ultrasonic probe mounting hole (17) respectively, and a sealing ring (45) is provided between the acoustic emission probe (41) and the ultrasonic probe (42) and the hole wall of the pressure head body (1).

4. The multifunctional pressure box for rock physics and mechanics testing in deep earth, deep space and deep sea environments according to any one of claims 1 to 3, characterized in that: The front end of the multifunctional pressure head (100) is provided with an annular sealing groove (11), and the plurality of penetration holes (21) are located inside the annular sealing groove (11); a sealing fluid injection channel (13) is provided inside the multifunctional pressure head (100), and one end of the sealing fluid injection channel (13) is connected to the annular sealing groove (11); An annular sealing strip (3) is arranged in the annular sealing groove (11), and the annular sealing strip (3) has an annular groove.

5. The multifunctional pressure box for rock physics and mechanics testing in deep earth, deep space and deep sea environments according to claim 4 is characterized by: The multifunctional pressure head (100) comprises a pressure head body (1) and a permeable pad (2); the annular sealing groove (11) is integrally manufactured at the front end edge of the pressure head body (1); the sealing fluid injection channel (13) and the seepage fluid channel (14) are arranged in the pressure head body (1); and the other ends of the sealing fluid injection channel (13) and the seepage fluid channel (14) pass through the outer side surface of the pressure head body (1); The front end of the pressure head body (1) has an integrally manufactured rectangular convex portion (12), the rectangular convex portion (12) is located within the inner periphery of the annular sealing groove (11), the front end surface of the rectangular convex portion (12) has an integrally manufactured embedded groove (15), one end of the seepage fluid channel (14) passes through the embedded groove (15); the permeable pad (2) is embedded in the embedded groove (15), the plurality of permeable holes (21) are provided on the permeable pad (2), and the permeable holes (21) pass through the permeable pad (2) from front to back.

6. The multifunctional pressure box for rock physics and mechanics testing in deep earth, deep space and deep sea environments according to claim 5 is characterized by: The permeable pad (2) is provided with a plurality of circles of permeable holes (21) at equal intervals from the inside to the outside, each circle is arranged concentrically with the center of the permeable pad (2) as the center of the circle, and each circle has a plurality of permeable holes (21) arranged at equal intervals along the circumferential direction; The back of the permeable pad (2) is provided with a plurality of circular grooves (23) and a plurality of radial straight grooves (24); the plurality of circles of permeable holes (21) are respectively located on one of the circular grooves (23) and are connected to the corresponding circular grooves (23); the radial straight grooves (24) are connected to the plurality of circular grooves (23); the plurality of radial straight grooves (24) are arranged at equal intervals along the circumferential direction; one end of the seepage fluid channel (14) is directly opposite to one of the circular grooves (23) and / or the radial straight grooves (24).

7. The multifunctional pressure box for rock physics and mechanics testing in deep earth, deep space and deep sea environments according to claim 1 is characterized by: At least one displacement detection device (500) is provided between two multifunctional pressing heads (100) in the X-axis direction; at least one displacement detection device (500) is provided between two multifunctional pressing heads (100) in the Y-axis direction; and at least one displacement detection device (500) is provided between two multifunctional pressing heads (100) in the Z-axis direction.

8. The multifunctional pressure box for rock physics and mechanics testing in deep earth, deep space and deep sea environments according to claim 7 is characterized by: The displacement detection device (500) comprises a displacement sensor (501), an extensometer rod (502) and two sensor connecting arms (503); the sensor connecting arms (503) are respectively fixed to two multifunctional pressure heads (100) in the same axial direction; one end of the displacement sensor (501) is connected to one of the sensor connecting arms (503); one end of the extensometer rod (502) is connected to the other sensor connecting arm (503); and the other end of the displacement sensor (501) is connected to or in contact with the other end of the extensometer rod (502).

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