An improved axial compression, confining pressure and water permeability testing device

Abstract

The application discloses an improved shaft pressure, confining pressure and water permeation test device, which comprises a piston, the inside of the piston is provided with a first solution channel, the bottom of the piston is movably hinged with a leveling piece, the inside of the leveling piece is provided with a second solution channel which is communicated with the first solution channel, the bottom of the leveling piece is provided with an upper pressure head, the inside of the upper pressure head is provided with a third solution channel which is communicated with the second solution channel, the bottom of the upper pressure head is provided with a water permeation plate, the bottom of the water permeation plate is provided with a test sample, and the outside of the upper pressure head, the water permeation plate and the test sample is sleeved with an isolation film. The leveling piece is used for leveling, which can effectively prevent the vertical eccentric pressure or the shear and torsion damage of the test sample caused by the uneven surface of the device parts and the test sample, ensures the normal test, and optimizes the force transmission performance of the device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geotechnical mechanics test equipment, more particularly to an improved axial compression, confining pressure and water permeation test device. BACKGROUND

[0002] Currently, in the existing test device for performing tests under the condition of axial compression-confining pressure-water permeation triaxial stress, adjacent device components and components and samples are in direct contact, and a straight-up straight-down cylindrical component design is adopted, which does not take into account that when the sample surface is uneven or the component processing surface is uneven, the sample will be eccentrically compressed, sheared and the force state will not be in the vertical force vertical transmission problem.

[0003] Therefore, how to provide an improved axial compression, confining pressure and water permeation test device capable of effectively preventing unevenness of the device or sample surface from causing vertical eccentric compression of the device and shearing and torsional damage of the sample is one of the technical problems urgently to be solved in the field. SUMMARY

[0004] Therefore, the present application provides an improved axial compression, confining pressure and water permeation test device, which aims to solve the above problems.

[0005] To solve the above technical problems, the present application adopts the following technical solutions:

[0006] An improved axial compression, confining pressure and water permeation test device, comprising: a piston; the inside of the piston is provided with a first solution channel, and the bottom of the piston is movably hinged with a leveling piece; the inside of the leveling piece is provided with a second solution channel in communication with the first solution channel, and the bottom of the leveling piece is provided with an upper pressure head; the inside of the upper pressure head is provided with a third solution channel in communication with the second solution channel; the bottom of the upper pressure head is provided with a water permeable plate; the bottom of the water permeable plate is provided with a sample; the upper pressure head, the water permeable plate and the sample outside are provided with an isolation film.

[0007] Preferably, the bottom of the piston is provided with an arc-shaped groove; correspondingly, the upper part of the leveling piece is provided with an arc-shaped boss structure matched with the arc-shaped groove; the inside of the arc-shaped groove is provided with a connecting assembly for movably connecting with the leveling piece.

[0008] Preferably, the connecting assembly comprises a fixed part and a movable part; the fixed part is connected to the top of the arc-shaped groove; the top of the movable part is hinged to the inside of the fixed part, and the lower part of the movable part is provided in the inside of the leveling piece; the inside of the movable part is provided with the second solution channel penetrating through the movable part.

[0009] Preferably, the middle part of the fixing member is provided with a mounting groove penetrating through the fixing member; the lower inner surface of the mounting groove is provided as an arc surface which is wide at the top and narrow at the bottom; the top part of the movable member is provided with a spherical hinge joint which is matched with the arc surface; and the spherical hinge joint is arranged in the mounting groove.

[0010] The top part of the leveling member is provided with a first counterbore groove.

[0011] Preferably, the top part of the upper pressing head is provided with a second counterbore groove.

[0012] Preferably, the water-permeable plate is uniformly provided with a plurality of water-permeable holes penetrating through the water-permeable plate; and the top part of the water-permeable plate is provided with a petal-shaped drainage groove.

[0013] Preferably, the outer side of the water-permeable stone is arranged on the outer side of the sample; and the outer side of the water-permeable stone is attached to the inner side of the isolation film.

[0014] Preferably, a sealing ring is arranged between the upper pressing head and the isolation film.

[0015] The present application has the following technical effects relative to the prior art:

[0016] 1) The leveling member is used for leveling in the present application, which can effectively prevent the vertical eccentric pressing or the shear and torsion damage of the sample caused by the unevenness of the machining surface of the device parts and the sample surface, so as to ensure that the test can be normally carried out and optimize the force transmission performance of the device.

[0017] 2) The fixing member and the movable member are arranged in the present application, which not only achieves the purpose of connecting the piston and the leveling member, but also ensures that the leveling member can be flexibly rotated, so that the leveling member can be used for leveling, thereby preventing the vertical eccentric pressing or the shear and torsion damage of the sample caused by the unevenness of the machining surface of the device parts and the sample surface.

[0018] 3) The petal-shaped drainage groove is arranged on the top part of the water-permeable plate in the present application, and the water-permeable hole is arranged inside, which not only facilitates the flow of the solution, but also avoids the problem that the contact surface of the upper pressing head and the water-permeable plate is damaged due to stress concentration under vertical stress.

[0019] 4) The water-permeable stone is arranged in the present application, which not only achieves the purpose of making the solution flow up and down, but also adds constraints to the side of the sample, so as to simulate the lateral constraint force of the actual stratum on the underground structure, and make the test results more in line with the actual situation.

[0020] 5) The sealing ring is arranged between the isolation film and the upper pressing head in the present application, which can better isolate the hydraulic oil outside the isolation film from the solution flowing inside the isolation film, and enhance the sealing performance of the device. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1Structure diagram of an improved axial pressure, confining pressure and water permeability test device of the present application;

[0022] Figure 2 Structure diagram of a piston;

[0023] Figure 3 Structure diagram of a leveling piece;

[0024] Figure 4 Structure diagram of an upper pressure head;

[0025] Figure 5 Structure diagram of a water permeable plate;

[0026] Figure 6 Structure diagram of a connecting assembly from one perspective;

[0027] Figure 7 Structure diagram of a connecting assembly from another perspective;

[0028] Figure 8 Structure diagram of a connecting assembly from another perspective;

[0029] In the figure: 1, piston; 2, first solution channel; 3, leveling piece; 4, connecting assembly; 401, fixed piece; 402, movable piece; 5, second solution channel; 6, upper pressure head; 7, third solution channel; 8, water permeable plate; 9, test sample; 10, isolation membrane; 11, arc-shaped recess; 12, mounting groove; 13, spherical hinge; 14, first counterbore recess; 15, second counterbore recess; 16, water permeable hole; 17, drainage groove; 18, water permeable stone; 19, sealing ring; 20, first inner hexagonal hole; 21, second inner hexagonal hole; 22, threaded groove; 23, threaded hole. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0031] EMBODIMENT

[0032] REFERENCE Figures 1-8As shown, the improved shaft pressure, confining pressure and water permeability test device is disclosed, which comprises a piston 1; a first solution channel 2 is arranged in the piston 1, and a leveling piece 3 is movably connected to the bottom of the first solution channel 2; the leveling piece 3 is rotated to change the angle, so that the test device can be leveled; a second solution channel 5 is arranged in the leveling piece 3 and is communicated with the first solution channel 2, and an upper pressure head 6 is arranged at the bottom of the leveling piece 3; a third solution channel 7 is arranged in the upper pressure head 6 and is communicated with the second solution channel 5; a water permeable plate 8 is arranged at the bottom of the upper pressure head 6; a sample 9 is arranged at the bottom of the water permeable plate 8; the first solution channel 2, the second solution channel 5 and the third solution channel 7 are communicated with each other, so that the solution can flow through the first solution channel 2, the second solution channel 5 and the third solution channel 7 and then flow into the upper part of the water permeable plate 8 and permeate downward through the water permeable plate 8; an isolation film 10 is arranged outside the upper pressure head 6, the water permeable plate 8 and the sample 9, which is used to isolate the solution flowing in the upper pressure head 6 and the water permeable plate 8 from the hydraulic oil outside the isolation film 10, so as to prevent the solution from flowing and affecting the test results.

[0033] In the embodiment, an arc-shaped groove 11 is arranged at the bottom of the piston 1; correspondingly, the upper part of the leveling piece 3 is provided with an arc-shaped convex structure matched with the arc-shaped groove 11; the arc-shaped groove 11 is provided with a connecting assembly 4 movably connected with the leveling piece 3; by arranging the arc-shaped groove 11 and the arc-shaped convex structure matched with each other, the flexible rotation of the leveling piece 3 relative to the piston 1 is facilitated.

[0034] In the embodiment, the connecting assembly 4 comprises a fixed part 401 and a movable part 402; the fixed part 401 is connected to the top of the arc-shaped groove 11; the movable part 402 is hingedly connected to the inside of the fixed part 401, and the lower part of the movable part 402 is arranged in the inside of the leveling piece 3; the inside of the movable part 402 is provided with the second solution channel 5 penetrating through the movable part 402.

[0035] In the embodiment, the middle part of the fixed part 401 is provided with a mounting groove 12 penetrating through the fixed part 401; the lower inner surface of the mounting groove 12 is provided with an arc surface with a wide upper part and a narrow lower part; the top of the movable part 402 is provided with a spherical hinge joint 13 matched with the arc surface; the spherical hinge joint 13 is arranged in the mounting groove 12, which is used to realize the movable connection between the fixed part 401 and the movable part 402.

[0036] In the embodiment, the movable part 402 and the spherical hinge joint 13 are integrated.

[0037] In the embodiment, the top of the arc-shaped groove 11 is provided with a threaded groove 22; the fixed part 401 is threadedly connected in the threaded groove 22; the inside of the leveling piece 3 is provided with a threaded hole 23 penetrating through the leveling piece 3; the movable part 402 is threadedly connected in the threaded hole 23.

[0038] In this embodiment, two symmetrically arranged first hexagonal holes 20 are provided at the bottom of the fixing member 401, so that when the fixing frame 401 and the piston 1 are assembled, a hexagonal wrench can be used for installation, which is convenient and quick.

[0039] In this embodiment, a second hexagonal hole 21 is provided at the bottom of the second solution channel 5 of the movable part 402. The second hexagonal hole 21 is coaxially arranged with the second solution channel 5, so that when the movable part 402 and the leveling part 3 are assembled, a hexagonal wrench can be used for installation, which is convenient and quick.

[0040] In this embodiment, a first reaming groove 14 is provided on the top of the leveling member 3. The first reaming groove 14 is coaxially arranged with the threaded hole 23, and its inner diameter is larger than the inner diameter of the threaded hole 23, which is used to prevent the leveling member 3 from being blocked by the fixing member 401 during leveling.

[0041] In this embodiment, a second reaming groove 15 is provided on the top of the upper pressure head 6. The second reaming groove 15 is coaxially arranged with the third solution channel 7, and its internal diameter is larger than the internal diameter of the third solution channel 7. It is used to prevent the leveling member 3 and the upper pressure head 6 from being misaligned, resulting in the internal solution flow channel being blocked, causing the solution flow to be obstructed.

[0042] In this embodiment, the water-permeable plate 8 is evenly distributed with a plurality of water-permeable holes 16 penetrating the water-permeable plate 8; the top of the water-permeable plate 8 is provided with a drainage groove 17 with a petal-shaped structure, which not only facilitates the flow of the solution, but also avoids the problem of stress concentration and damage to parts caused by the contact surface between the upper pressure head 6 and the water-permeable plate 8 when vertical force is applied.

[0043] In this embodiment, a permeable stone 18 is provided on the outside of the sample 9; the outside of the permeable stone 18 is in contact with the inside of the isolation membrane 10; by providing the permeable stone 18, the purpose of allowing the solution to flow up and down is achieved, and constraints are added to the side of the sample 9, which can simulate the lateral constraints of the actual stratum on the underground structure, making the test results more in line with reality. At the same time, the isolation membrane 10 isolates the permeable stone 18 from the hydraulic oil used to apply confining pressure, avoiding the solution circulating inside the device from flowing with the hydraulic oil when flowing in the device, making the pressurization unstable and thus affecting the test results.

[0044] In this embodiment, sealing rings 19 are provided between the upper pressure head 6 and the isolation membrane 10, between the leveling member 3 and the upper pressure head 6, and between the piston 1 and the leveling member 3 to prevent side leakage of the device and ensure the sealing of the device.

[0045] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An improved axial pressure, confining pressure and water seepage pressure test device, characterized in that: include: A piston (1); a first solution channel (2) is provided inside the piston (1), and a leveling member (3) is movably hinged at its bottom; a second solution channel (5) communicating with the first solution channel (2) is provided inside the leveling member (3), and an upper pressure head (6) is provided at its bottom; a third solution channel (7) communicating with the second solution channel (5) is provided inside the upper pressure head (6); a water-permeable plate (8) is provided at the bottom of the upper pressure head (6); a sample (9) is provided at the bottom of the water-permeable plate (8); an isolation membrane (10) is provided on the outer sides of the upper pressure head (6), the water-permeable plate (8), and the sample (9); The bottom of the piston (1) is provided with an arc-shaped groove (11); accordingly, the upper portion of the leveling member (3) is provided with an arc-shaped boss structure adapted to the arc-shaped groove (11); and a connecting assembly (4) for movably connecting to the leveling member (3) is provided inside the arc-shaped groove (11); The connecting assembly (4) includes a fixed part (401) and a movable part (402); the fixed part (401) is connected to the top of the arc-shaped groove (11); the top of the movable part (402) is hinged to the inside of the fixed part (401), and the lower part thereof is passed through the inside of the leveling part (3); the inside of the movable part (402) is provided with the second solution channel (5) passing through the movable part (402); The middle portion of the fixing member (401) is provided with a mounting groove (12) that passes through the fixing member (401); the lower inner surface of the mounting groove (12) is configured as an arc surface that is wider at the top and narrower at the bottom; the top of the movable member (402) is provided with a spherical hinge joint (13) that matches the arc surface; the spherical hinge joint (13) is disposed in the mounting groove (12); A threaded groove (22) is provided at the top of the arc-shaped groove (11); the fixing member (401) is threadedly connected to the threaded groove (22); a threaded hole (23) penetrating the leveling member (3) is provided inside the leveling member (3); the movable member (402) is threadedly connected to the threaded hole (23); The water-permeable plate (8) is evenly distributed with a plurality of water-permeable holes (16) penetrating the water-permeable plate (8); a drainage groove (17) having a petal-shaped structure is provided on the top of the water-permeable plate (8); A first reaming groove (14) is provided on the top of the leveling member (3).

2. An improved axial pressure, confining pressure and water seepage pressure test device according to claim 1, characterized in that: A second hole-expanding groove (15) is provided on the top of the upper pressing head (6).

3. The improved axial pressure, confining pressure and water seepage pressure test device according to claim 1, characterized in that: The outer side of the sample (9) is covered with a permeable stone (18); the outer side of the permeable stone (18) is in contact with the inner side of the isolation membrane (10).

4. The improved axial pressure, confining pressure and water seepage pressure test device according to claim 1, characterized in that: A sealing ring (19) is provided between the upper pressure head (6) and the isolation membrane (10).

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