Seepage pressure head and pressure cell for rock physics and mechanics testing in deep earth, deep space and deep sea environments

Abstract

The present invention relates to a seepage pressure head and a pressure box for testing the physical mechanics of rocks in deep earth, deep space and deep sea environments, including a sealing pressure head, a front end of which is provided with an annular sealing groove and a plurality of evenly arranged penetration holes, wherein the plurality of penetration holes are located within the annular sealing groove; a sealing fluid injection channel and a seepage fluid channel are provided in the sealing pressure head, one end of the sealing fluid injection channel is connected with the annular sealing groove, and one end of the seepage fluid channel is connected with the plurality of penetration holes. During use, fluids of different temperatures and pressures can be injected through the seepage fluid channel according to experimental requirements, and the fluid can flow evenly to the sample through the plurality of penetration holes; and a sealing fluid can be injected into the annular sealing groove through the sealing fluid injection channel, so as to prevent the fluid from flowing out from the edge of the sample. The sealing pressure head of the present application can evenly transfer pressure to the sample, and can also realize even distribution of fluid on the surface of the sample; the seepage pressure box of the present application can realize three-way sealing of a cubic sample, and can be used for three-way permeability testing.

Description

Technical Field

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

[0002] There are a lot of resources and energy in the deep earth, deep sea and deep space, so they are gradually moving to the deep. However, deep rocks are in extremely complex seepage and temperature fields. Because deep rocks face complex mechanical environments, the implementation of related projects faces huge challenges, so it is of great significance to carry out physical and mechanical tests of deep rock masses.

[0003] The permeability test of gas or water in rocks is of great significance to engineering practice and industrial safety. Existing rock permeability test systems can only perform permeability test and are difficult to carry out stress test.

[0004] In addition, the existing rock permeability testing system can only test the permeability in a fixed direction (vertical direction), while the actual engineering reservoir rock mass is a three-way seepage field, and the existing rock permeability testing system needs to be improved. Summary of the invention

[0005] The present application provides a seepage pressure head and a pressure box for rock physical and mechanical testing in deep earth, deep space and deep sea environments. The first application solves the problem that existing rock permeability testing systems can often only perform seepage behavior tests and are difficult to carry out stress experiments. The second application solves the problem that existing rock permeability testing systems are difficult to implement three-way seepage testing.

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

[0007] The seepage pressure head for rock physics and mechanics testing in deep earth, deep space and deep sea environments provided by the present application includes a sealing pressure head, the front end of which has an annular sealing groove and a number of evenly arranged penetration holes, and the several penetration holes are located in the inner periphery of the annular sealing groove; a sealing fluid injection channel and a seepage fluid channel are provided in the sealing pressure head, one end of the sealing fluid injection channel is connected to the annular sealing groove, and one end of the seepage fluid channel is connected to the several penetration holes. During use, fluids of different temperatures and pressures can be injected through the seepage fluid channel according to experimental requirements, and the fluid can flow evenly to the sample through the several penetration holes; and the sealing fluid can be injected into the annular sealing groove through the sealing fluid injection channel to prevent the fluid from flowing out from the edge of the sample.

[0008] Optionally, the sealing 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, one end of the sealing fluid injection channel is connected to the annular sealing groove, and the other end is connected to the outer surface of the pressure head body;

[0009] The front end of the pressure head body is provided with an integrally manufactured embedding groove, which is located inside the annular sealing groove. One end of the seepage fluid channel passes through the embedding groove, and the other end passes through the outer surface of the pressure head body. The permeable pad is installed in the embedding groove, and the plurality of permeable holes are provided on the permeable pad, and the permeable holes pass through the permeable pad from front to back.

[0010] Optionally, the front end of the pressure head body is provided with an integrally manufactured rectangular protrusion, the rectangular protrusion is located inside the annular sealing groove, and the embedding groove is located on the front end surface of the rectangular protrusion.

[0011] In particular, the permeable pad is provided with multiple 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 of the circle, and each circle has multiple permeable holes arranged at equal intervals along the circumferential direction; the back of the permeable pad is provided with multiple circular grooves and multiple radial straight grooves, the multiple circles of permeable holes are respectively located on one of the circular grooves and connected with the corresponding circular grooves, the radial straight grooves connect multiple circular grooves, and the multiple 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.

[0012] The seepage pressure box for rock physics and mechanics testing in deep earth, deep space and deep sea environments provided in the present application includes the seepage pressure head for rock physics and mechanics testing in deep earth, deep space and deep sea environments, and there are 6 sealing pressure heads; the 6 sealing pressure heads are located in pairs in the X-axis direction, the Y-axis direction and the Z-axis direction.

[0013] Optionally, the six sealing pressure heads are connected together using at least eight elastic sheets.

[0014] Optionally, the seepage pressure box for rock physics and mechanics testing in deep earth, deep space and deep sea environments provided in the present application also includes a sample sealing fixture, which is used to fix the sample, and the sample sealing fixture has six directions with openings respectively reserved for matching with six sealing pressure heads.

[0015] In particular, the sample sealing fixture includes a rigid outer cube frame and a flexible inner cube frame, each of which has 12 frame edges, and the six faces of the rigid outer cube frame and the flexible inner cube frame are all rectangular frames; the cube sample can be loaded into the flexible inner cube frame, the flexible inner cube frame is manufactured as one piece, and the 12 outer edges of the flexible inner cube frame are tightly fitted with the 12 inner edges of the rigid outer cube frame; each face of the flexible inner cube frame has an integrally manufactured annular flange, and the annular flange is used to be inserted into the annular sealing groove of the sealing pressure head.

[0016] In particular, the 12 inner corner positions of the flexible inner cube frame have right-angle side structures adapted to the corners of the cube specimen.

[0017] Optionally, the front ends of the six sealing pressure heads extend from the frame openings in six directions of the sample sealing fixture to contact the surface of the cubic sample in the sample sealing fixture; the annular flange is inserted into the annular sealing groove of the sealing pressure head, and an annular sealing strip is provided between the two.

[0018] Compared with the prior art, this application has the following beneficial effects:

[0019] 1. The sealing pressure head of the present application can evenly transfer pressure to the sample and also achieve uniform distribution of fluid on the surface of the sample;

[0020] 2. Using this application, fluids of different temperatures and pressures can be injected through the seepage fluid channel according to experimental requirements, and the fluid can flow evenly to the sample through a number of permeable holes; and the sealing fluid can be injected into the annular sealing groove through the sealing fluid injection channel to prevent the fluid from flowing out of the edge of the sample, which can be used for rock mass seepage testing;

[0021] 3. The permeability pressure box of the present application can realize three-way sealing of the cubic sample and can be used for three-way permeability test. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 is a three-dimensional diagram of the sealing pressure head in the embodiment;

[0024] Figure 2 is a front view of the sealing pressure head in the embodiment;

[0025] Figure 3 yes Figure 2 Sectional view at AA in the middle;

[0026] Figure 4 yes Figure 2 Sectional view at the middle BB;

[0027] Figure 5 is a three-dimensional diagram of the indenter body in the embodiment;

[0028] Figure 6 is a three-dimensional image of the penetration pad in the first viewing angle in the embodiment;

[0029] Figure 7 is a three-dimensional image of the penetration pad in the second viewing angle of the embodiment;

[0030] Figure 8 is a three-dimensional diagram of a seepage pressure box for rock physics and mechanics testing in deep earth, deep space and deep sea environments in an embodiment;

[0031] Fig. 9is a three-dimensional diagram of the sample sealing fixture in the embodiment;

[0032] Fig.10 is a front view of the sample sealing fixture in the embodiment;

[0033] Fig.11 yes Fig.10 Sectional view at CC;

[0034] Fig.12 yes Fig.10 Sectional view at DD in the middle;

[0035] Fig.13 is a three-dimensional diagram of the flexible inner cube frame of an embodiment;

[0036] Fig.14 is a cross-sectional view of the flexible inner cubic frame of the embodiment;

[0037] Fig.15 is a three-dimensional diagram of the six indenter bodies and the sample sealing fixture assembled together in the embodiment;

[0038] Fig.16 This is a front view of the six indenter bodies and the sample sealing fixture assembled together in the embodiment;

[0039] Fig.17 yes Fig.16 Sectional view at EE;

[0040] Fig.18 yes Fig.16 Cross-sectional view at FF. DETAILED DESCRIPTION

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present invention and simplifying the description, and does 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. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0046] 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.

[0047] like Figure 1-Figure 4 As shown, the seepage pressure head for deep earth, deep space and deep sea environment rock physical and mechanical testing disclosed in this embodiment includes a sealing pressure head 100, and the front end of the sealing pressure head 100 is provided with an annular sealing groove 11 and a plurality of evenly arranged penetration holes 21, and the plurality of penetration holes 21 are located inside the annular sealing groove 11; a sealing fluid injection channel 13 and a seepage fluid channel 14 are provided inside the sealing pressure head 100, one end of the sealing fluid injection channel 13 is connected with the annular sealing groove 11, and one end of the seepage fluid channel 14 is connected with the plurality of penetration holes 21. Through the seepage fluid channel 14, fluids of different temperatures and pressures can be injected according to experimental requirements, and the fluids can flow evenly to the sample through the plurality of penetration holes 21; and through the sealing fluid injection channel 13, a sealing fluid can be injected into the annular sealing groove 11, which can prevent the fluid from flowing out from the edge of the sample, and can be used for rock mass seepage testing.

[0048] In a possible design, the sealing head 100 includes a head body 1 and a permeable pad 2 .

[0049] like Figure 5 As shown, the front end edge of the pressure head body 1 has an integrally manufactured annular sealing groove 11 and an integrally manufactured rectangular protrusion 12 , the rectangular protrusion 12 is located inside the annular sealing groove 11 , and the annular sealing strip 3 is embedded in the annular sealing groove 11 .

[0050] A sealing fluid injection channel 13 and a seepage fluid channel 14 are provided in the pressure head body 1 . One end of the sealing fluid injection channel 13 is connected to the annular sealing groove 11 , and the other end is connected to the outer surface of the pressure head body 1 .

[0051] The front end of the rectangular protrusion 12 has an integrally manufactured embedding groove 15, and one end of the seepage fluid channel 14 passes through the embedding groove 15, and the other end passes through the outer surface of the pressure head body 1. The permeable pad 2 is installed in the embedding groove 15 by screws, and a plurality of permeation holes 21 are evenly arranged on the permeable pad 2, and the permeation holes 21 pass through the permeable pad 2 from front to back. Through the permeation fluid channel 14, fluids of different temperatures and pressures can be injected according to experimental requirements, and the fluid flows into the embedding groove and then flows evenly to the sample through the plurality of permeation holes 21.

[0052] 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.

[0053] In particular, the back of the permeable pad 2 has a plurality of circular grooves 22 and a plurality of radial straight grooves 23, the plurality of circles of permeable holes 21 are respectively located on one of the circular grooves 22 and are connected with the corresponding circular grooves 22, the radial straight grooves 23 are connected with a plurality of circular grooves 22, and the plurality of radial straight grooves 23 are arranged at equal intervals along the circumferential direction. It is preferable that one end of the seepage fluid channel 14 is directly opposite to one of the circular grooves 22 and / or the radial straight grooves 23.

[0054] It is worth noting that the number of the circular grooves 22 and the radial straight grooves 23 is reasonably set according to the needs. In a possible design, there are 4 radial straight grooves 23 and 5-7 circular grooves 22.

[0055] In a possible design, the sealing fluid injection channel 13 and the seepage fluid channel 14 are both L-shaped, one end of the sealing fluid injection channel 13 is vertically connected to the annular sealing groove 11, and the other end is vertically connected to the side wall of the pressure head body 1. One end of the seepage fluid channel 14 is vertically connected to the embedded groove 15, and the other end is vertically connected to the side wall of the pressure head body 1.

[0056] In a possible design, two fluid pipeline connectors 16 are installed on the side wall of the pressure head body 1 , and the other ends of the sealing fluid injection channel 13 and the seepage fluid channel 14 are respectively connected to one of the fluid pipeline connectors 16 .

[0057] In order to facilitate docking with external components, a docking port is provided at the rear end of the pressure head body 1.

[0058] Optionally, the cross section of the annular sealing strip 3 is a U-shaped structure with the opening facing outward.

[0059] Optionally, the pressure head body 1 is made of a high-rigidity alloy material as a whole. The penetration pad 2 also has high rigidity.

[0060] Optionally, the annular sealing strip 3 is made of high-strength rubber.

[0061] like Figure 8 As shown, the seepage pressure box for deep earth, deep space and deep sea environment rock physics and mechanics testing disclosed in this embodiment includes 6 sealing pressure heads 100, such as Figure 15-18 As shown, the six sealing pressure heads 100 are respectively located on three axes, and the three axes in this article refer to the X axis, Y axis, and Z axis in the three-axis coordinate system. The six pressure heads are: two sealing pressure heads 100 symmetrically arranged in the X axis direction, two sealing pressure heads 100 symmetrically arranged in the Y axis direction, and two sealing pressure heads 100 symmetrically arranged in the Z axis direction.

[0062] In a possible design, the sealing head 100 is rectangular and the six sealing heads 100 are respectively matched with the six faces of the cubic sample 400 .

[0063] like Figure 8 As shown, six sealing pressure heads 100 are connected together by at least eight elastic sheets 300 so that the inner sides thereof form a sample space for placing a cubic sample 400 .

[0064] It is worth noting that the number of elastic sheets 300 is reasonably set according to needs. In this embodiment, 12 elastic sheets 300 are used to connect 6 sealing heads 100 together, and each sealing head 100 is connected to the surrounding 4 sealing heads 100 through an elastic sheet 300. Of course, in another possible design, more elastic sheets 300 can be used to connect the 6 sealing heads 100 together.

[0065] Optional, such as Figure 3 As shown, the outer end of the sealing press head 100 is provided with a spring slot 101 adapted to the elastic sheet 300, and a screw hole is provided in the spring slot 101. One end of the elastic sheet 300 is placed in the spring slot 101 and connected to the sealing press head 100 by screws.

[0066] In a possible design, the seepage pressure box for rock physics and mechanics testing in deep earth, deep space and deep sea environments also includes a sample sealing fixture 200. Figure 9-12 As shown, the sample sealing fixture 200 is used to fix the cubic sample 400, and at the same time, openings adapted to the six sealing pressure heads 100 need to be reserved in six directions. In a possible design, the sample sealing fixture 200 includes a rigid outer cubic frame 201 and a flexible inner cubic frame 202, wherein the rigid outer cubic frame 201 has 12 frame edges, and the six faces of the rigid outer cubic frame 201 are all rectangular frames.

[0067] The cube sample 400 can be loaded into the flexible inner cube frame 202. The flexible inner cube frame 202 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.

[0068] In one possible design, Fig.13 , Fig.14 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 .

[0069] The 12 outer corner positions 2023 of the flexible inner cubic frame 202 fit closely 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.

[0070] In a possible design, 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.

[0071] In a possible design, a cube sample 400 of 100*100*100 mm can be loaded into the flexible inner cube frame 202 .

[0072] In a possible design, the sealing head 100 is matched with the rectangular frame opening of the rigid outer cubic frame 201 , and the two can be relatively fixed by friction. The rectangular protrusion 12 is matched with the rectangular frame opening of the flexible inner cubic frame 202 .

[0073] The working principle of this embodiment:

[0074] The cubic sample 400 is placed in the flexible inner cubic frame 202 of the sample sealing fixture 200, and the front ends of the six sealing pressure heads 100 extend from the frame openings in six directions of the sample sealing 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 sealing pressure heads 100.

[0075] High-pressure sealing fluid is injected into the annular sealing groove 11 through the sealing fluid injection channels 13 inside the six pressure head bodies 1, so that the annular sealing strip 3 fits tightly with the flexible inner cube frame 202, and the 12 edges of the cube sample 400 fit tightly with the flexible inner cube frame 202, so as to achieve high-pressure sealing between the edge of the sealing pressure head 100 and the corners of the cube sample 400. Subsequently, the seepage fluid is injected through the seepage fluid channel 14 of one of the sealing pressure heads 100 on the same axis, and the seepage fluid flows evenly to the cube sample 400 through the permeable pad 2; the seepage fluid channel 14 of another sealing pressure head 100 on the same axis serves as the seepage fluid outlet. The 12 edges of the cube sample 400 are sealed to each other, which can prevent the fluids at the edge of the sample from circulating with each other; it is worth noting that the seepage pressure should be less than the sealing pressure.

[0076] In the stress loading experiment, six actuators are used to apply axial forces to six sealing pressure heads 100 respectively, so that a three-axis six-directional stress loading experiment can be carried out.

[0077] 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. Seepage pressure cell for rock physics and mechanics testing in deep earth, deep space and deep sea environments, characterized by: The invention comprises a seepage pressure head and a sample sealing fixture (200), wherein the seepage pressure head comprises a sealing pressure head (100), wherein the sealing pressure head (100) comprises a pressure head body (1), wherein the front end edge of the pressure head body (1) is provided with an integrally manufactured annular sealing groove (11), and the pressure head body (1) is provided with a sealing fluid injection channel (13), wherein one end of the sealing fluid injection channel (13) is connected to the annular sealing groove (11), and the other end of the sealing fluid injection channel (13) is connected to the outer surface of the pressure head body (1); The sample sealing fixture (200) is used to fix the sample, and the sample sealing fixture (200) is provided with a reserved opening adapted to the sealing pressure head (100); the sample sealing fixture (200) comprises a rigid outer cubic frame (201) and a flexible inner cubic frame (202), and the cubic sample (400) can be loaded into the flexible inner cubic frame (202), and the flexible inner cubic frame (202) is manufactured in one piece, and the outer corner positions (2023) of the flexible inner cubic frame (202) are closely fitted with the inner corners of the rigid outer cubic frame (201); Each surface of the flexible inner cubic frame (202) has an integrally manufactured annular flange (2022), which is inserted into the annular sealing groove (11) of the sealing pressure head (100), and an annular sealing strip (3) is provided between the two; 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). High-pressure sealing fluid is injected into the annular sealing groove (11) through the sealing fluid injection channel (13), so that the annular sealing strip (3) and the flexible inner cubic frame (202) can be tightly fitted.

2. The seepage pressure cell for rock physics and mechanics testing in deep earth, deep space and deep sea environments according to claim 1 is characterized by: There are six sealing pressure heads (100), and the six sealing pressure heads (100) are located in pairs in the X-axis direction, the Y-axis direction, and the Z-axis direction; The sample sealing fixture (200) has openings respectively reserved in six directions for matching with six sealing pressure heads (100); the rigid outer cube frame (201) and the flexible inner cube frame (202) both have 12 frame edges, and the six faces of the rigid outer cube frame (201) and the flexible inner cube frame (202) are all rectangular frames; and the 12 outer corner positions (2023) of the flexible inner cube frame (202) are tightly fitted with the 12 inner corner positions of the rigid outer cube frame (201).

3. The seepage pressure cell for rock physics and mechanics testing in deep earth, deep space and deep sea environments according to claim 1 or 2, characterized in that: The sealing ram (100) further comprises a permeable pad (2), the front end of the ram body (1) having an integrally manufactured embedding groove (15), the embedding groove (15) being located inside the annular sealing groove (11), the permeable pad (2) being mounted in the embedding groove (15), and the permeable pad (2) having a plurality of permeable holes (21) extending from front to back; A seepage fluid channel (14) is provided in the pressure head body (1), one end of the seepage fluid channel (14) passes through the embedded groove (15), and the other end passes through the outer surface of the pressure head body (1).

4. The seepage pressure cell for rock physics and mechanics testing in deep earth, deep space and deep sea environments according to claim 3 is characterized by: The front end of the pressure head body (1) is provided with an integrally manufactured rectangular convex block (12), the rectangular convex block (12) is located inside the annular sealing groove (11), and the embedding groove (15) is located on the front end surface of the rectangular convex block (12).

5. The seepage pressure cell for rock physics and mechanics testing in deep earth, deep space and deep sea environments according to claim 3 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 (22) and a plurality of radial straight grooves (23); the plurality of circles of permeable holes (21) are respectively located on one of the circular grooves (22) and are connected to the corresponding circular grooves (22); the radial straight grooves (23) are connected to the plurality of circular grooves (22); and the plurality of radial straight grooves (23) 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 (22) and / or the radial straight grooves (23).

6. The seepage pressure box for rock physics and mechanics testing in deep earth, deep space and deep sea environments according to claim 2: the six sealing pressure heads (100) are connected together by at least eight elastic sheets (300).

7. The seepage pressure cell for rock physics and mechanics testing in deep earth, deep space and deep sea environments according to claim 2 is characterized by: The 12 inner corner positions of the flexible inner cubic frame (202) have right-angle side structures (2024) adapted to the corners of the cubic sample (400).

8. The seepage pressure cell for rock physics and mechanics testing in deep earth, deep space and deep sea environments according to claim 2 or 7, characterized in that: The front ends of the six sealing pressure heads (100) extend from the frame openings in six directions of the sample sealing fixture (200) respectively to contact the surface of the cubic sample (400) in the sample sealing fixture (200).

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