Rock tension test unit under confining pressure environment

Abstract

The utility model discloses a rock tension test unit under confining pressure environment, which comprises a first base and a second base, a first support column and a second support column are arranged between the first base and the second base, the first end of the first support column is fixedly connected with the first base, and the second end of the first support column is slidably connected with the second base. The first end of the second supporting column is fixedly connected with the second base, the second end of the second supporting column is slidably connected with the first base, and the first base and the second base can be adjusted in a sliding mode. The device further comprises a first supporting beam and a second supporting beam, the first supporting beam is fixedly connected to the first supporting column, the second supporting beam is fixedly connected to the second supporting column, the first supporting beam is located between the second base and the second supporting beam, the side, facing the second supporting beam, of the first supporting beam is fixedly connected with a first connecting base, and the side, facing the first supporting beam, of the second supporting beam is fixedly connected with a second connecting base. A sample is mounted between the connecting seat I and the connecting seat II. The rock sample pressure testing device can convert pressure into pulling force and is suitable for rock sample pressure testing in a confining pressure environment.

Description

Technical Field

[0001] The utility model relates to rock testing equipment, and more particularly to a rock tensile testing unit under a confining pressure environment. Background Art

[0002] Rock tensile testing can help us understand the deformation and failure characteristics of rocks under tensile stress and is an important method for studying rock mechanical properties. During the test, tensile loads are applied to observe the rock's deformation behavior and measure the strain and stress under different tensile stresses. By analyzing the test data, we can determine the rock's tensile strength, among other parameters.

[0003] Natural rocks often exist in complex geostress environments. Confining pressure conditions simulate the geostress conditions experienced by actual rock masses deep underground. Rock tensile testing under confining pressure can more accurately simulate the actual stress conditions experienced by rocks deep underground, effectively assessing their strength and deformation properties. Therefore, studying the mechanical properties of rocks under varying geostress conditions is of great significance.

[0004] Current rock mechanics testing machines are typically only capable of applying pressure. During testing, rock mechanics tests often focus solely on compressive parameters, making it difficult to apply tension to the rock, and thus impossible to perform tension tests on the rock. Therefore, a new solution is needed to address this issue. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and provide a rock tensile test unit under a confined pressure environment, which can convert pressure into tension and is suitable for pressure testing of rock samples.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solution: a rock tensile test unit under a confined pressure environment, comprising a base one and a base two, wherein a support column one and a support column two are provided between the base one and the base two, wherein a first end of the support column one is fixedly connected to the base one, and a second end of the support column one is slidably connected to the base two, a first end of the support column two is fixedly connected to the base two, and a second end of the support column two is slidably connected to the base one, and the base one and the base two can slide and adjust with each other;

[0007] It also includes support beam 1 and support beam 2, wherein support beam 1 is fixedly connected to support column 1, and support beam 2 is fixedly connected to support column 2. Support beam 1 is located between base 2 and support beam 2, and support beam 1 and support beam 2 are arranged opposite to each other in an upper and lower direction. Support beam 1 is fixedly connected to connecting seat 1 on the side facing support beam 2, and support beam 2 is fixedly connected to connecting seat 2 on the side facing support beam 1, and connecting seat 1 and connecting seat 2 are used to install samples.

[0008] The present invention is further configured such that the two ends of the sample are respectively bonded to the first connecting seat and the second connecting seat, and the first connecting seat and the second connecting seat are provided with grooves for the ends of the sample to be embedded.

[0009] The present invention is further configured such that a connecting portion 1 is fixedly connected to a side of the connecting seat 1 facing away from the sample, and the connecting portion 1 passes through a supporting beam 1 and is fixed by a nut 1.

[0010] The present invention is further configured such that a second receiving hole is provided at a position of the second base corresponding to the first connecting portion, and at least a portion of the first connecting portion and the first nut is located in the second receiving hole;

[0011] The present invention is further configured such that the second accommodating hole passes through the second base, and a second cover plate is provided on a side of the second base facing away from the first base, and the second cover plate can cover the second accommodating hole.

[0012] The present invention is further configured such that a second connecting portion is fixedly connected to a side of the second connecting seat facing away from the sample, and the second connecting portion passes through a second supporting beam and is fixed by a second nut.

[0013] The present invention is further configured such that a first receiving hole is provided at a position of the base corresponding to the second connecting portion, and at least a portion of the second connecting portion and the second nut is located in the first receiving hole;

[0014] The present invention is further configured such that the accommodating hole 1 passes through the base 1, and a cover plate 1 is provided on a side of the base 1 facing away from the base 2, and the cover plate 1 can cover the accommodating hole 1.

[0015] The present invention is further configured such that the first support beam is threadedly connected to the first support column, and the pressing and limiting is achieved through a stepped surface; the second support beam is threadedly connected to the second support column, and the pressing and limiting is achieved through a stepped surface.

[0016] The present invention is further configured such that the base 1 is provided with a guide sliding hole 1, and the guide sliding hole 1 is slidably adapted to the second end of the support column 2; the base 2 is provided with a guide sliding hole 2, and the guide sliding hole 2 is slidably adapted to the second end of the support column 1.

[0017] The present invention is further configured such that the sample is in a rotating body structure, and the outer diameter of the sample gradually decreases from both ends to the middle.

[0018] The utility model is further configured such that an isolation sleeve is sleeved on the periphery of the sample, and both ends of the sample are respectively bonded to the first connecting seat and the second connecting seat by epoxy resin glue.

[0019] In summary, the present invention has the following beneficial effects:

[0020] By adopting two sets of support structures and installing them in an inverted structure, force conversion can be achieved, and pressure can be converted into tension, thereby realizing pressure testing of rock tests. Among them, when base one and base two apply relative pressure, base one and base two approach each other, and the force of base one is transmitted to support beam one through support column one, and the force of base two is transmitted to support beam two through support column two, so that support beam one and support beam two can form a movement trend toward each other. Connecting seat one and connecting seat two will follow support beam one and support beam two, and produce a movement trend away from each other, which can apply tension to both ends of the sample, thereby realizing pressure testing of rock samples. During the test, the test unit can convert pressure into tension, and thus can be suitable for use with traditional confining pressure test equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of a rock tensile test unit under confined pressure in this embodiment;

[0022] Figure 2 This is a cross-sectional view of a rock tensile test unit under confined pressure in this embodiment. Figure 1 ;

[0023] Figure 3 This is a cross-sectional view of a rock tensile test unit under confined pressure in this embodiment. Figure 2 ;

[0024] Figure 4 Schematic diagram of the explosion of a rock tensile test unit under a confined pressure environment in this embodiment.

[0025] Figure markings: 1. Base one; 101. Cover plate one; 11. Guide slide hole one; 12. Accommodating hole one; 2. Support beam one; 3. Support column one; 31. First end; 32. Second end; 4. Connecting seat one; 41. Connecting part one; 42. Nut one; 5. Specimen; 6. Base two; 601. Cover plate two; 61. Guide slide hole two; 62. Accommodating hole two; 7. Support beam two; 8. Support column two; 81. First end; 82. Second end; 9. Connecting seat two; 91. Connecting part two; 92. Nut two. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] This embodiment discloses a rock tensile test unit under confined pressure environment, referring to Figure 1-Figure 4 As shown, it includes base 1 and base 2 6, and base 1 1 and base 2 6 are respectively distributed in an upper and lower structure. Support column 1 3 and support column 2 8 are arranged between base 1 and base 2 6. There are two support columns 1 3 and two support columns 2 8, and the four columns are evenly distributed in parallel.

[0028] The first end of support column 1 (3) is fixedly connected to base 1 (1). First end 31 of support column 1 (3) fits snugly into a groove in base 1 and is secured with bolts, stably connecting the two. Second end 32 of support column 1 (3) is slidably connected to guide hole 2 (61) of base 2 (6).

[0029] Support column 2 8 is fixedly connected to base 2 6 , using a similar connection structure to support column 1 3 , secured by bolts. The second end 82 of support column 2 8 is slidably connected to guide hole 11 of base 1 1 . Guided by support columns 1 3 and 2 8 , base 1 1 and base 2 6 can slide relative to each other.

[0030] Support beam 1 2 and support beam 2 7 are also provided between base 1 1 and base 2 6. Support beam 1 2 is located between base 2 6 and support beam 2 7, and support beam 2 7 is located between base 1 1 and support beam 1 2. Generally, base 1 1, support beam 2 7, support beam 1 2, and base 2 6 are arranged in order from bottom to top.

[0031] Support beam 1 2 is fixedly connected to support column 1 3, and support beam 1 2, base 1 and support column 1 3 can move synchronously; and support beam 2 7 is fixedly connected to support column 2 8, and support beam 2 7, base 2 6 and support column 2 8 can move synchronously.

[0032] Support beam 1 2 and support beam 2 7 are arranged opposite each other in an upper and lower direction. The side of support beam 1 2 facing support beam 2 7 is fixedly connected to connection seat 1 4, and the side of support beam 2 7 facing support beam 1 2 is fixedly connected to connection seat 2 9. The rock sample 5 to be tested is installed between connection seat 1 4 and connection seat 2 9 and bonded by an adhesive. When base 1 1 and base 2 6 apply relative pressure, base 1 1 and base 2 6 approach each other, and the force applied to base 1 1 is transmitted to support beam 1 2 through support column 1 3, and the force applied to base 2 6 is transmitted to support beam 2 7 through support column 2 8, so that support beam 1 2 and support beam 2 7 can form a movement trend toward each other. Connection seat 1 4 and connection seat 2 9 will follow support beam 1 2 and support beam 2 7, generating a movement trend away from each other, which can apply tension to both ends of sample 5, thereby realizing a pressure test of rock sample 5. During the test, the test unit can convert pressure into tension, and can be used with traditional confining pressure test equipment.

[0033] Specifically, refer to Figure 2 As shown, the outer diameter of the second end of the support column 3 is reduced to form a stepped structure. The second end of the support column 3 is threadedly connected to the support beam 2, and the stepped structure is used to achieve pressure limiting, which can stably transmit the force between the support column 3 and the support beam. In addition, the connection structure between the support column 2 8 and the support beam 2 7 is similar to the above connection structure, and can also use a threaded connection combined with a stepped structure for limiting. For details, refer to Figure 3 shown.

[0034] In addition, the end position of the second end of the support column 3 is a cylindrical structure with a smooth outer periphery, and the base 6 is provided with a guide sliding hole 2 61, and the second end of the support column 3 can be inserted into the guide sliding hole 2 61 to form a stable and smooth sliding connection structure; the end position of the second end of the support column 2 8 is also a cylindrical structure with a smooth outer periphery, and the base 1 is provided with a guide sliding hole 11, and the second end of the support column 2 8 can be inserted into the guide sliding hole 11 to form a stable and smooth sliding connection structure.

[0035] Specimen 5 is a body of rotation, and its outer diameter gradually decreases from its ends toward the center, forming a columnar structure that is thicker at both ends and thinner in the middle. To ensure the bond strength between specimen 5 and connectors 1 and 2, grooves slightly larger than the ends of specimen 5 can be provided on connectors 1 and 2, respectively. Epoxy resin is then used to fill the gaps and achieve bonding. This ensures the bond strength between specimen 5 and connectors 1 and 2, 9, preventing them from falling off during the tensile test.

[0036] In addition, an isolation sleeve is installed on the outer periphery of the sample 5. The isolation sleeve can block the sample 5 from the confining pressure liquid, preventing the liquid in the confining pressure environment from entering the gap in the middle of the sample 5, causing the internal structure of the sample 5 to be destroyed, and affecting the accuracy of the test.

[0037] A connecting portion 41 is fixedly connected to the side of the connecting base 4 facing away from the specimen 5. This portion 41 passes through the support beam 2 and is secured by a nut 42. Furthermore, a receiving hole 62 is defined in the base 6 corresponding to the connecting portion 41. At least portions of the connecting portion 41 and the nut 42 are located within the receiving hole 62, providing a clearing position and preventing direct pressure between the connecting portion 41 and the base 6, which could interfere with the connection.

[0038] In addition, the second accommodating hole 62 passes through the second base 6 , and a second cover plate 601 is installed on the side of the second base 6 away from the first base 1 . The second cover plate 601 adopts a detachable structure and can cover the second accommodating hole 62 .

[0039] Similarly, a second connection portion 91 is fixedly connected to the side of the second connection base 9 facing away from the specimen 5. The second connection portion 91 passes through the second support beam 7 and is secured by a second nut 92. Furthermore, a first receiving hole 12 is provided in the base 1 at a position corresponding to the second connection portion 91. At least a portion of the second connection portion 91 and the second nut 92 are located within the first receiving hole 12, providing a clearing position and preventing direct pressure from the second connection portion 91 and the base 1, which could cause interference.

[0040] In addition, the receiving hole 12 passes through the base 1, and a cover plate 101 is installed on the side of the base 1 facing away from the base 2 6. The cover plate 101 adopts a detachable structure and can cover the receiving hole 12.

[0041] Furthermore, the cross-section of connection part 1 41 can adopt a quadrilateral or hexagonal structure, and the hole in support beam 1 2 can also adopt a shape-matching structure. The connection part is inserted into the hole of support beam 1 2, which can limit the rotation of connection part 1 41 and maintain the stability of the position. It can then be locked and fixed with a nut to improve the stability of the installation structure. The shape of connection part 2 91 and the shape of the connection hole of support beam 2 7 can also adopt a similar structure, similarly maintaining the installation stability of connection part 2 91.

[0042] When the rock tensile test unit in this embodiment is used, epoxy resin glue is first applied to both ends of the sample 5, and then the two ends of the sample 5 are connected to the connecting seat 1 4 and the connecting seat 2 9 respectively and cured.

[0043] Then, an isolation sleeve is put on the outer periphery of sample 5. The isolation sleeve can be a heat shrink tube sleeve, which is put on the outer periphery of the test, and the two ends are put on the outside of connecting sleeve 1 and connecting sleeve 2. The heat shrink tube sleeve is heat-shrunk by a hot hair dryer, and the outer periphery of the connection between the heat shrink tube sleeve and connecting sleeve 1 and connecting sleeve 2 is tightened with wire. Sample 5 will be completely contained in the isolation sleeve.

[0044] Then, refer to Figure 4 In the structure, the various components are installed in sequence from bottom to top, and the connecting sleeve 1 and the connecting sleeve 2 are respectively installed on the support beam 1 2 and the support beam 2 7, which can support and fix the sample 5.

[0045] Then, the second end of the support column 3 is threadedly connected and fixed to the support beam 2, the first end 31 of the support column 3 is connected and fixed to the base 1, and the second end 32 of the support column 3 is inserted into the guide hole 61 of the base 6; the second end 82 of the support column 2 8 is threadedly connected and fixed to the support beam 2 7, the first end 81 of the support column 2 8 is connected and fixed to the base 6, and the second end 82 of the support column 2 8 is inserted into the guide hole 11 of the base 1.

[0046] Then, the entire rock tensile test unit was placed into the MTS triaxial pressure system, and the press head was adjusted to compact the test unit to complete the test preparation.

[0047] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A rock tensile test unit under confining pressure environment, characterized in that: The invention comprises a base 1 (1) and a base 2 (6), wherein a support column 1 (3) and a support column 2 (8) are provided between the base 1 (1) and the base 2 (6), wherein the first end (31) of the support column 1 (3) is fixedly connected to the base 1 (1), and the second end (32) of the support column 1 (3) is slidably connected to the base 2 (6), the first end (81) of the support column 2 (8) is fixedly connected to the base 2 (6), and the second end (82) of the support column 2 (8) is slidably connected to the base 1 (1), and the base 1 (1) and the base 2 (6) can slide and adjust with each other; The invention also includes a support beam 1 (2) and a support beam 2 (7), wherein the support beam 1 (2) is fixedly connected to the support column 1 (3), and the support beam 2 (7) is fixedly connected to the support column 2 (8). The support beam 1 (2) is located between the base 2 (6) and the support beam 2 (7), and the support beam 1 (2) and the support beam 2 (7) are arranged in an upper and lower relative manner. The support beam 1 (2) is fixedly connected to a connecting seat 1 (4) on the side facing the support beam 2 (7), and the support beam 2 (7) is fixedly connected to a connecting seat 2 (9) on the side facing the support beam 1 (2). The connection seat 1 (4) and the connection seat 2 (9) are used to install the sample (5).

2. A rock tensile test unit under confined pressure environment according to claim 1, characterized in that: The two ends of the sample (5) are respectively bonded to the connecting seat 1 (4) and the connecting seat 2 (9), and the connecting seat 1 (4) and the connecting seat 2 (9) are provided with grooves capable of being embedded in the ends of the sample (5).

3. The rock tensile test unit under confined pressure environment according to claim 1, characterized in that: The side of the connecting seat 1 (4) facing away from the sample (5) is fixedly connected with a connecting portion 1 (41), and the connecting portion 1 (41) passes through the supporting beam 1 (2) and is fixed by a nut 1 (42).

4. A rock tensile test unit under confined pressure environment according to claim 3, characterized in that: The second base (6) is provided with a second receiving hole (62) at a position corresponding to the first connecting portion (41), and at least a portion of the first connecting portion (41) and the first nut (42) is located in the second receiving hole (62); The second receiving hole (62) passes through the second base (6), and a second cover plate (601) is provided on the side of the second base (6) away from the first base (1), and the second cover plate (601) can cover the second receiving hole (62).

5. The rock tensile test unit under confined pressure environment according to claim 1, characterized in that: The second connecting seat (9) is fixedly connected to a second connecting portion (91) on a side facing away from the sample (5), and the second connecting portion (91) passes through the second supporting beam (7) and is fixed by a second nut (92).

6. A rock tensile test unit under confined pressure environment according to claim 5, characterized in that: The base 1 (1) is provided with a receiving hole 1 (12) at a position corresponding to the connecting portion 2 (91), and at least a portion of the connecting portion 2 (91) and the nut 2 (92) is located in the receiving hole 1 (12); The receiving hole 1 (12) passes through the base 1 (1), and a cover plate 1 (101) is provided on the side of the base 1 (1) facing away from the base 2 (6), and the cover plate 1 (101) can cover the receiving hole 1 (12).

7. The rock tensile test unit under confined pressure environment according to claim 1, characterized in that: The support beam 1 (2) is connected to the support column 1 (3) by threaded connection, and the pressure limiting is achieved through the stepped surface; the support beam 2 (7) is connected to the support column 2 (8) by threaded connection, and the pressure limiting is achieved through the stepped surface.

8. The rock tensile test unit under confined pressure environment according to claim 1, characterized in that: The base 1 (1) is provided with a guide slide hole 1 (11), and the guide slide hole 1 (11) is slidably adapted to the second end of the support column 2 (8); the base 2 (6) is provided with a guide slide hole 2 (61), and the guide slide hole 2 (61) is slidably adapted to the second end of the support column 1 (3).

9. The rock tensile test unit under confined pressure environment according to claim 1, characterized in that: The sample (5) has a rotating body structure, and the outer diameter of the sample (5) gradually decreases from both ends to the middle.

10. The rock tensile test unit under confined pressure environment according to claim 1, characterized in that: An isolation sleeve is provided on the outer periphery of the sample (5), and both ends of the sample (5) are respectively bonded to the first connecting seat (4) and the second connecting seat (9) by epoxy resin glue.

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