A high pressure true triaxial testing system

Abstract

The utility model discloses a high pressure true triaxial test system relates to rock indoor loading test field. The utility model discloses triaxial testing machine and rock sample, triaxial testing machine is provided with test cavity and triaxial pressurizing device of high pressure, and rock sample is placed in the preservation box, and the preservation box includes the box frame, the box wall, the box bottom and the box cover, and the box frame is the square frame, and the inside of box frame is equipped with the mounting groove for placing rock sample, and the box wall is slidably connected on the box frame, and the box bottom is slidably connected on the bottom of box frame, and the box wall and the box bottom all only slide to the center direction of box frame, and the box cover is fixedly connected on the box frame, and the bottom of box cover is provided with the first clamping block for preventing the box wall from sliding, and through the cooperation of the box frame, the box wall, the box bottom and the box cover, the structure of rock sample after destruction can be protected, and the test cavity pollution caused by rock sample fragment falling after testing rock sample is effectively improved, and the test cavity cleaning frequency of staff is reduced.

Description

Technical Field

[0001] This utility model relates to the field of indoor rock loading tests, specifically a high-pressure true triaxial testing system. Background Technology

[0002] In fields such as geotechnical engineering, geological exploration, and energy development, high-pressure true triaxial testing is widely used as a core testing method to conduct in-depth research on the mechanical properties of rocks under complex stress states, such as compressive strength, deformation patterns, and failure mechanisms. As engineering projects expand into deeper underground spaces, such as deep mineral mining, oil and gas well drilling, and underground tunnel excavation, the geological environment of rocks becomes increasingly complex, facing higher pressure levels and stress states closer to true triaxial conditions. This places higher demands on the accuracy, stability, and reliability of high-pressure true triaxial testing technology.

[0003] In existing technologies, high-pressure true triaxial testing usually relies on triaxial testing machines to simulate the actual stress environment by applying pressure in different directions to the rock sample. However, most systems lack a dedicated rock sample preservation structure. After the rock sample is subjected to a destructive test, it is not possible to remove the rock sample without damaging its post-test structure. It is also not possible to better observe the destructive structure of the rock sample under pressure. In addition, rock sample fragments will be generated after the rock sample is subjected to pressure during the test, which will contaminate the test chamber and is inconvenient to clean. Utility Model Content

[0004] Based on this, the purpose of this utility model is to provide a high-pressure true triaxial testing system to solve the technical problem of better preservation of rock samples after they are damaged.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-pressure true triaxial testing system, comprising a triaxial testing machine and a rock sample. The triaxial testing machine includes a test chamber and a triaxial pressurization device for providing high pressure. The rock sample is placed in a storage box, which includes a box frame, box walls, a box bottom, and a box cover. The box frame is a square frame, and an installation groove for placing the rock sample is provided on the inner side of the box frame. The box walls are slidably connected to the box frame, and the box bottom is slidably connected to the bottom of the box frame. Both the box walls and the box bottom slide only towards the center of the box frame. The box cover is fixedly connected to the box frame, and a first locking block is provided at the bottom of the box cover to prevent the box walls from sliding.

[0006] By adopting the above technical solution, placing the rock sample in a storage box consisting of a frame, walls, bottom, and lid can effectively protect the rock sample, preventing damage or contamination caused by the external environment before testing, and ensuring the original state of the rock sample. After the rock sample is pressurized and destroyed by the triaxial pressurization device, the storage box can easily remove the rock sample and rock sample fragments from the test chamber without contaminating the test chamber.

[0007] Furthermore, an L-shaped groove is provided on the surface of the box frame facing the box wall, and a first slider is fixedly connected to the side of the box wall facing the box frame, and the slider is slidably connected in the L-shaped groove.

[0008] By adopting the above technical solution, the sliding of the box wall has a precise guiding structure, which avoids the box wall from deviating or getting stuck during the sliding process, ensuring that the box wall can slide smoothly towards the center of the box frame, and at the same time ensuring that the box wall is convenient and quick to install on the box frame.

[0009] Furthermore, a second slider is fixedly connected to the outer wall of the box bottom, and a groove that cooperates with the second slider is opened on the side of the box frame facing the box bottom.

[0010] By adopting the above technical solution, the specific method of sliding connection between the two was clarified, providing a stable track for the sliding of the bottom of the box, making the bottom of the box slide more smoothly and steadily towards the center of the box frame, and avoiding tilting of the bottom of the box during sliding, which would cause uneven force applied to the rock sample.

[0011] Furthermore, a rotating block for fixing the box lid is rotatably connected to the top of the box frame, and a second locking block is fixedly connected to the side wall of the box lid.

[0012] By adopting the above technical solution, the problem of rock sample fragments spilling out and contaminating the test chamber environment can be avoided when the storage box is not properly sealed and is removed at the end of the test.

[0013] Furthermore, the triaxial pressurization device consists of 6 hydraulic units, each of which operates independently. Each hydraulic unit has a force transmission plate at its end, and the force transmission plate is connected to the hydraulic unit via a ball joint. The hydraulic units are respectively located on the X-axis, Y-axis, and Z-axis, and are symmetrically arranged on the same axis.

[0014] By adopting the above technical solution, rock samples can be pressurized independently and uniformly in three different directions, which meets the requirements of high-pressure true triaxial testing for multi-directional pressurization. This makes the pressure on the rock sample more consistent with the stress situation in actual engineering, thereby improving the authenticity and reference value of the test results and avoiding the problem of large deviations between the test results and the actual situation due to a single pressurization direction or uneven pressurization.

[0015] Furthermore, both the box walls and the box bottom are made of high-strength polytetrafluoroethylene (PTFE) sheets.

[0016] By adopting the above technical solution, and utilizing the excellent strength characteristics of high-strength polytetrafluoroethylene (PTFE) sheets, the walls and bottom of the storage box are less prone to damage when subjected to certain pressure and external forces, thus extending the service life of the storage box and preventing cracks before or during testing due to insufficient strength of the walls or bottom. This ensures the safety of rock samples and the smooth progress of testing, and reduces test interruptions or increased costs caused by equipment damage.

[0017] Furthermore, a handle is fixedly connected to the frame.

[0018] By adopting the above technical solution, operators can easily move the storage box by simply holding the handle, avoiding difficulties in moving the box due to its smooth surface or lack of leverage points. This reduces the risk of the storage box falling or colliding during the handling process, ensuring the safety of the rock sample and the storage box. At the same time, it also reduces the labor intensity of operators and improves the ease of operation.

[0019] In summary, the present invention has the following main advantages:

[0020] 1. This utility model, through the cooperation of the box frame, box wall, box bottom and box cover, can protect the structure of the rock sample after damage, and effectively improve the test chamber contamination caused by rock sample fragments falling off after the rock sample is tested, and reduce the frequency of cleaning the test chamber by the staff.

[0021] 2. This utility model ensures the integrity of the storage box through the cooperation of the rotating block, L-shaped groove, first locking block and second locking block, so as to better preserve rock samples and achieve better experimental observation results. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the storage box structure in this utility model;

[0024] Figure 3 This is a schematic diagram of the frame structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the middle box cover structure of this utility model;

[0026] Figure 5 This is a schematic diagram of the bottom structure of the box in this utility model;

[0027] Figure 6 This is a schematic diagram of the middle box wall structure of this utility model;

[0028] Figure 7 This is a schematic diagram of the cross-sectional structure of the triaxial testing machine in this utility model;

[0029] Figure 8This is a cross-sectional schematic diagram of the storage box and the triaxial testing machine in this utility model;

[0030] Figure 9 This utility model Figure 8 Enlarged diagram of point A in the middle.

[0031] In the diagram: 1. Triaxial testing machine; 2. Rock sample; 3. Test chamber; 4. Triaxial pressurization device; 5. Storage box; 6. Box frame; 8. Mounting slot; 9. Handle; 10. L-shaped groove; 11. Slide groove; 12. Rotating block; 13. Box wall; 14. First slider; 15. Box bottom; 16. Second slider; 17. Box cover; 18. First locking block; 19. Second locking block; 20. Hydraulic unit; 21. Force transmission plate; 22. Ball joint. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0033] In this example:

[0034] A high-pressure true triaxial testing system, such as Figure 1-9The diagram shows a triaxial testing machine 1 and a rock sample 2. The triaxial testing machine 1 includes a test chamber 3 and a triaxial pressurizing device 4 that provides high pressure. The triaxial pressurizing device 4 can apply stress in three different directions to the rock sample 2 to ensure a safe testing environment. The rock sample 2 is placed in a storage box 5. The storage box 5 ensures that the rock sample 2 can maintain its integrity to a certain extent after the destructive test, and also prevents rock sample fragments from contaminating the test chamber 3. The storage box 5 includes a frame 6, a wall 13, a bottom 15, and a lid 17. The frame 6 is a square frame, specifically a square frame at the bottom with columns at the four corners. The inner side of the frame 6 has a mounting groove 8 for placing the rock sample 2, making the placement of the rock sample 2 in the storage box 5 more fixed and preventing displacement. The wall 13 is slidably connected to... On the frame 6, the box wall 13 ensures complete force transmission to the rock sample 2. The box bottom 15 is slidably connected to the bottom of the frame 6, ensuring complete force transmission to the rock sample 2. Both the box wall 13 and the box bottom 15 slide only towards the center of the frame 6, ensuring that the force transmission is not incomplete due to angle issues. The box cover 17 is fixedly connected to the frame 6. The top of the box cover 17 is in the same plane as the top of the frame 6, and the bottom of the box cover 17 fits against the top of the rock sample 2, thus ensuring that the box cover 17, the frame 6, the box wall 13, and the box bottom 15 can form a sealed box structure. The bottom of the box cover 17 is provided with a first locking block 18 to prevent the box wall 13 from sliding. When the box cover 17 is closed, it ensures the stability of the overall structure of the box 5 and provides a stable storage environment for the rock sample 2.

[0035] See Figure 2 The box frame 6 has an L-shaped groove 10 on the surface facing the box wall 13. The bottom end of the L-shaped groove 10 is parallel to the horizontal plane, and the top end of the longitudinal groove of the L-shaped groove 10 and the top end of the box frame 6 form an opening in the same plane. A first slider 14 is fixedly connected to the side of the box wall 13 facing the box frame 6. When installing the box wall 13, the first slider 14 enters the L-shaped groove 10 through the opening for sliding installation. The first slider 14 is slidably connected in the L-shaped groove 10.

[0036] See Figure 2 , Figure 4 A second slider 16 is fixedly connected to the outer wall of the box bottom 15. The box frame 6 has a groove 11 on the side facing the box bottom 15 that cooperates with the second slider 16. The top of the groove 11 has an opening to facilitate the installation of the second slider 16. The cooperation between the second slider 16 and the groove 11 restricts the sliding direction of the box bottom 15 and prevents the box bottom 15 from falling off the bottom of the box frame 6 after installation.

[0037] See Figure 1The top of the box frame 6 is rotatably connected to a rotating block 12 for fixing the box cover 17. As shown in the figure, when the rotating block 12 is at the angle shown in the figure, the box cover 17 can be detached. When the rotating block 12 is rotated 45°, the box cover 17 is in a fixed state. A second locking block 19 is fixedly connected to the side wall of the box cover 17. The second locking block 19 restricts the box wall 13 from sliding upward and prevents the box wall 13 from sliding off the box frame 6.

[0038] See Figure 1 , Figure 7 and Figure 8 The triaxial pressurization device 4 consists of six hydraulic actuators 20, each of which operates independently. Each hydraulic actuator 20 has a force transmission plate 21 at its end, and the force transmission plate 21 is connected to the hydraulic actuator 20 via a ball joint 22. The hydraulic actuators 20 are respectively arranged on the X-axis, Y-axis, and Z-axis, and are symmetrically arranged on the same axis. This enables independent and uniform pressurization of the rock sample 2 in three different directions, meeting the requirements of high-pressure true triaxial testing for multi-directional pressurization.

[0039] See Figure 2 The box wall 13 and the box bottom 15 are both made of high-strength polytetrafluoroethylene (PTFE) sheet. The high-strength PTFE sheet has good strength characteristics, which makes the box wall 13 and the box bottom 15 less prone to damage when subjected to certain pressure and external forces.

[0040] See Figure 2 The box frame 6 is fixedly connected to a handle 9, which provides a convenient force point for the handling and movement of the storage box 5. The operator can easily move the storage box 5 by simply holding the handle 9.

[0041] The implementation principle of this embodiment is as follows: Before the test, the rock sample 2 is first cut into a cube and the outer wall of the rock sample 2 is polished. Then, the bottom of the box 15 is installed on the box frame 6. When installing the bottom of the box 15, the second slider 16 is aligned with the slide groove 11 and installed. After the bottom of the box 15 is installed, the bottom surface of the bottom of the box 15 and the bottom surface of the box frame 6 are on the same horizontal plane. Then, the rock sample 2 is placed in the mounting groove 8 of the box frame 6. Then, the box wall 13 is installed and the first slider 14 is aligned with the top port of the L-shaped groove 10 and installed. After the box wall 13 and the bottom of the box 15 are installed on the box frame 6, a box with an open top is formed. Finally, it is placed in the test chamber 3 to start the test.

[0042] In the experiment, the storage box 5 was first placed on the force transmission plate 21 below the Z-axis. The hydraulic device 20 above the Z-axis was controlled to work, and the force transmission plate 21 was controlled to press down to apply prestress to fix the rock sample 2. Then, the hydraulic devices 20 of the X-axis and Y-axis were controlled to work. The operation of the hydraulic devices 20 of the X-axis and Y-axis controlled the force transmission plate 21 to push towards the box wall 13. The box wall 13 could slide towards the center of the box frame 6 to apply force to the rock sample 2 and perform stress testing on the rock sample 2.

[0043] After the test, first control the hydraulic device 20 to move the force transmission plate 21 away from the rock sample 2. Then, place the cover 17 on the storage box 5. The first locking block 18 prevents the box wall 13 from sliding. The bottom of the cover 17 fits against the top of the rock sample 2. Then, rotate the rotating block 12 to fix the cover 17 in place to prevent it from falling off. Finally, remove the storage box 5 using the handle 9. (See reference) Figure 1 , Figure 7 and Figure 8 The triaxial pressurization device consists of six hydraulic units, each of which operates independently. Each hydraulic unit has a force transmission plate at its end, and the force transmission plate is connected to the hydraulic unit via a ball joint. The hydraulic units are respectively positioned on the X-axis, Y-axis, and Z-axis, and are symmetrically arranged on the same axis. This allows for independent and uniform pressurization of the rock sample in three different directions, meeting the requirements of high-pressure true triaxial testing for multi-directional pressurization.

[0044] See Figure 2 The box walls and bottom are made of high-strength polytetrafluoroethylene (PTFE) sheets. The high-strength PTFE sheets have good strength properties, which makes the box walls and bottom less prone to damage when subjected to certain pressure and external forces.

[0045] See Figure 2 The box frame is fixedly connected to a handle, which provides a convenient point of force for handling and moving the storage box. Operators can easily move the storage box by simply holding the handle.

[0046] The implementation principle of this embodiment is as follows: Before the test, the rock sample is first cut into cubes and the outer wall of the rock sample is polished. Then, the bottom of the box is installed on the box frame. When installing the bottom of the box, the second slider is aligned with the groove. After the bottom of the box is installed, the ground of the bottom of the box and the ground of the box frame are on the same horizontal plane. Then, the rock sample is placed in the box frame mounting groove. Then, the box wall is installed. The first slider is aligned with the top port of the L-shaped groove. After the box wall and the bottom of the box are installed on the box frame, a box with an open top is formed. Finally, it is placed in the test chamber to start the test.

[0047] In the experiment, the storage box was first placed on the force transmission plate below the Z-axis. The hydraulic device above the Z-axis was controlled to work, and the force transmission plate was pressed down to apply prestress to fix the rock sample. Then, the hydraulic devices of the X-axis and Y-axis were controlled to work. The operation of the hydraulic devices of the X-axis and Y-axis controlled the force transmission plate to press against the box wall. The box wall could slide towards the center of the box frame to apply force to the rock sample and perform stress testing on the rock sample.

[0048] After the test, first control the hydraulic device to move the force transmission plate away from the rock sample, then put the box cover on the storage box. The first locking block can prevent the box wall from sliding. The bottom of the box cover and the top of the rock sample are in contact. Then rotate the rotating block to fix the box cover to prevent it from falling off. Then take out the storage box by the handle.

[0049] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A high-pressure true triaxial testing system, characterized in that: It includes a triaxial testing machine (1) and a rock sample (2). The triaxial testing machine (1) includes a test chamber (3) and a triaxial pressurizing device (4) for providing high pressure. The rock sample (2) is placed in a storage box (5). The storage box (5) includes a box frame (6), box walls (13), a box bottom (15) and a box cover (17). The box frame (6) is a square frame. An installation groove (8) for placing the rock sample (2) is provided inside the box frame (6). The box walls (13) are slidably connected to the box frame (6). The box bottom (15) is slidably connected to the bottom of the box frame (6). Both the box walls (13) and the box bottom (15) only slide towards the center of the box frame (6). The box cover (17) is fixedly connected to the box frame (6). A first clamping block (18) for preventing the box walls (13) from sliding is provided at the bottom end of the box cover (17).

2. The high-pressure true triaxial testing system according to claim 1, wherein: An L-shaped groove (10) is provided on the surface of the box frame (6) facing the box walls (13). A first slider (14) is fixedly connected to one side of the box walls (13) facing the box frame (6). The first slider (14) is slidably connected in the L-shaped groove (10).

3. The high-pressure true triaxial test system according to claim 1, wherein: A second slider (16) is fixedly connected to the outer wall of the box bottom (15). A chute (11) matching the second slider (16) is provided on one side of the box frame (6) facing the box bottom (15).

4. The high-pressure true triaxial test system according to claim 1, wherein: A rotating block (12) for fixing the box cover (17) is rotatably connected to the top end of the box frame (6). Second clamping blocks (19) are fixedly connected to the side walls of the box cover (17).

5. The high-pressure true triaxial test system according to claim 1, characterized in that: The triaxial pressurizing device (4) is composed of 6 hydraulic cylinders (20). The hydraulic cylinders (20) work independently of each other. A force transmission plate (21) is provided at the end of the hydraulic cylinder (20). The force transmission plate (21) is connected to the hydraulic cylinder (20) through a spherical hinge joint (22). The hydraulic cylinders (20) are respectively arranged on the X-axis, Y-axis and Z-axis. The hydraulic cylinders (20) are symmetrically arranged on the same axis.

6. The high-pressure true triaxial testing system according to claim 1, wherein: Both the box walls (13) and the box bottom (15) are made of high-strength polytetrafluoroethylene plates.

7. The high-pressure true triaxial testing system according to claim 1, wherein: A handle (9) is fixedly connected to the box frame (6).

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