Brazilian splitting test clamp with lateral force

Abstract

The utility model provides a Brazilian splitting test clamp with lateral force. Comprising an upper loading plate and a lower loading plate which are oppositely arranged, a front loading plate and a rear loading plate which are in sliding connection with the lower loading plate, a guide column which is connected with the upper loading plate and the lower loading plate, a deformation measuring device which is arranged on one side of the upper loading plate, and a fixing block which is used for fixing the deformation measuring device. The front loading plate and the rear loading plate are oppositely arranged between the upper loading plate and the lower loading plate, and the oppositely arranged wall surfaces of the upper loading plate and the lower loading plate are arranged in an inward concave arc shape. According to the utility model, the front loading plate and the rear loading plate are arranged to apply load in the horizontal front-back direction, and the fixing blocks are arranged on the same side surfaces of the upper loading plate and the lower loading plate to fix the longitudinal strain measuring device to measure the deformation of the sample in the vertical direction; the purposes of applying lateral constraint to the rock material and measuring the deformation in the vertical direction are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of rock mechanics tests, in particular to a Brazilian splitting test fixture containing lateral force. Background Art

[0002] Rock materials are resistant to compression but not to tension. Rocks often fail in tension and shear under high stress. Many scholars at home and abroad have conducted shear strength test studies under different phases and lateral constraints on their shear strength, but there are few studies on tensile strength under lateral constraints. At present, the tensile strength test of rocks mainly adopts direct tensile method and Brazilian splitting indirect tensile method. Among them, the direct tensile method has significant limitations because it cannot guarantee the coincidence of the specimen axis and the stress axis. The Brazilian splitting indirect method has been widely used. The traditional Brazilian splitting indirect method is carried out under the condition of no lateral confinement of the specimen. The actual destruction process of deep rock mass is under a triaxial stress state, and the lateral constraint has a significant effect on the tensile failure of rock.

[0003] In view of this, it is necessary to design a Brazilian splitting test fixture with lateral force to study the failure mechanism of rock materials under lateral confinement conditions. Utility Model Content

[0004] The utility model aims to provide a fixture capable of applying lateral force and accurately measuring the longitudinal deformation of a Brazilian splitting sample, so as to achieve the purpose of applying lateral constraints to rock materials and measuring the vertical deformation.

[0005] To achieve the above-mentioned purpose of the utility model, the utility model provides a Brazilian splitting test fixture containing lateral force, including an upper loading plate and a lower loading plate arranged opposite to each other, a front loading plate and a rear loading plate slidably connected to the lower loading plate, a guide column connecting the upper loading plate and the lower loading plate, a deformation measuring device arranged on one side of the upper loading plate, and a fixing block for fixing the deformation measuring device; the front loading plate and the rear loading plate are arranged opposite to each other between the upper loading plate and the lower loading plate, and the wall surfaces of the upper loading plate and the lower loading plate arranged opposite to each other are arranged in an inwardly concave arc shape.

[0006] As a further improvement of the present utility model, the front loading plate includes a first main body portion with a circular cross-section and a first base arranged below the first main body portion; the first main body portion includes a cylindrical portion and two protruding portions arranged on both sides of the cylindrical portion; the longitudinal section of the first base is an inverted T-shape; and a first slide rail for the first base to slide is arranged on the lower loading plate.

[0007] As a further improvement of the utility model, the rear loading plate includes a cylindrical second main body and a second base arranged below the second main body; the longitudinal section of the second base is an inverted T-shape; and a second slideway for the second base to slide is arranged on the lower loading plate.

[0008] As a further improvement of the present invention, the cross-sections of the first slide and the second slide are both in an inverted T-shape; the first slide and the second slide are respectively arranged on both sides of the lower loading plate; the lengths of the first slide and the second slide are both less than 1 / 2 of the width of the lower loading plate, and the distance between the first slide and the second slide is greater than 20 mm.

[0009] As a further improvement of the utility model, the deformation measuring device is a magnetostrictive sensor; the front loading plate is provided with a groove for the telescopic rod of the magnetostrictive sensor to pass through.

[0010] As a further improvement of the present invention, the diameters of the front loading plate and the rear loading plate are 2 to 3 mm smaller than the diameter of the Brazilian splitting specimen.

[0011] As a further improvement of the present invention, the length of the first slideway is equal to that of the second slideway.

[0012] As a further improvement of the present invention, the second base is arranged in the middle position of the second main body, and the horizontal distance from the outermost side of the second base to the outermost side of the rear loading plate is greater than or equal to 5 mm.

[0013] As a further improvement of the present invention, the first slideway and the second slideway are arranged at a middle position of the lower loading plate.

[0014] As a further improvement of the present invention, the fixing block is arranged in a T-shape, the number of the fixing blocks is two, and the two fixing blocks are arranged at the middle position of the same side of the upper loading plate and the lower loading plate.

[0015] The beneficial effects of the utility model are:

[0016] The Brazilian splitting test fixture with lateral force provided by the utility model applies horizontal front-to-back direction loads by arranging a front loading plate and a rear loading plate which are slidably connected with a lower loading plate, and fixes a longitudinal strain measuring device by arranging a fixing block on the same side of the upper loading plate and the lower loading plate to measure the deformation of the sample in the vertical direction, thereby achieving the purpose of both applying lateral constraints to rock materials and measuring the deformation in the vertical direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a stereoscopic diagram of the Brazilian splitting test fixture containing lateral force of the utility model.

[0018] Figure 2 It is a front structural schematic diagram of the Brazilian splitting test fixture containing lateral force of the utility model.

[0019] Figure 3 for Figure 1 Schematic diagram of the structure of the front loading board in.

[0020] Figure 4 for Figure 1 Schematic diagram of the front structure of the front loading plate.

[0021] Figure 5 for Figure 1 Schematic diagram of the structure of the rear loading plate.

[0022] Figure 6 Schematic diagram of the side structure of the rear loading plate.

[0023] Figure 7 for Figure 1 Schematic diagram of the structure of the lower loading plate. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0026] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0027] See also Figures 1 to 7 As shown, the utility model provides a Brazilian splitting test fixture 100 with lateral force, including an upper loading plate 1 and a lower loading plate 2 arranged relatively, a front loading plate 3 and a rear loading plate 4 slidably connected to the lower loading plate 2, a guide column 5 connecting the upper loading plate 1 and the lower loading plate 2, a deformation measuring device 7 arranged on one side of the upper loading plate 1, and a fixing block 6 for fixing the deformation measuring device 7. The front loading plate 3 and the rear loading plate 4 are arranged relatively between the upper loading plate 1 and the lower loading plate 2, and the wall surface of the upper loading plate 1 and the lower loading plate 2 arranged relatively is arranged in an arc shape concave inward.

[0028] Specifically, the front loading plate 3 includes a first main body portion with a circular cross section and a first base 31 disposed below the first main body portion. The first main body portion includes a cylindrical portion 321 and two protruding portions 322 disposed on both sides of the cylindrical portion 321. A groove 323 is formed between the two protruding portions 322 and the cylindrical portion 321. In this embodiment, the groove 323 has a width of 10 mm and a depth of 15 mm, and is used for the deformation sensor in the deformation measuring device 7 to pass through.

[0029] The longitudinal section of the first base 31 is in an inverted T-shaped configuration. The first base 31 is disposed in the middle of the cylindrical portion 321, corresponding to the region where the groove 323 is located. From the longitudinal section, the width of the first base 31 is smaller than the width of the groove 323.

[0030] The rear loading plate 4 includes a cylindrical second main body 41 and a second base 42 disposed below the second main body 41. The longitudinal section of the second base 42 is in an inverted T-shape. The second base 42 is disposed in the middle of the second main body 41, and the horizontal distance from the outermost side of the second base 42 to the outermost side of the second main body 41 is greater than or equal to 5 mm when viewed from the side.

[0031] The lower loading plate 2 is provided with a first slide 22 and a second slide 21 for the first base 31 and the second base 42 to slide. The cross-sections of the first slide 22 and the second slide 21 are both inverted T-shaped, and the sizes are adapted to the first base 31 and the second base 42. In the present embodiment, the first slide 22 and the second slide 21 are arranged in the middle position of the lower loading plate. The lengths of the first slide 22 and the second slide 21 are equal, and the first slide 22 and the second slide 21 are arranged on both sides of the lower loading plate 2, and the lengths of the first slide 22 and the second slide 21 are both less than 1 / 2 of the width of the lower loading plate 2, and the distance between the first slide 22 and the second slide 21 is greater than 20 mm. In the present embodiment, 25 mm is reserved between the first slide 22 and the second slide 21 without a slide, which is used to place the Brazilian splitting specimen 8.

[0032] In particular, the diameters of the front loading plate 3 and the rear loading plate 4 are 2-3 mm smaller than the diameter of the Brazilian splitting specimen. This arrangement ensures that the upper loading plate 1, the lower loading plate 2, the front loading plate 3, and the rear loading plate 4 do not interfere with each other during the vertical loading process.

[0033] In this embodiment, the fixing block 6 is arranged in a T-shape, that is, a T-block. There are two fixing blocks 6, and the two fixing blocks 6 are arranged at the middle position of the same side of the upper loading plate 1 and the lower loading plate 2.

[0034] The deformation measuring device 7 is a magnetostrictive sensor. Two T-blocks connect the magnetostrictive sensor to the upper loading plate 1 and the lower loading plate 2 respectively. The telescopic rod 71 of the magnetostrictive sensor passes through the groove 323. The diameter of the telescopic rod is 5 mm.

[0035] When in use, the front loading plate 3 and the rear loading plate 4, under the action of the actuator pressure head, move along the first slide 22 and the second slide 21 on the lower loading plate 2 toward the Brazilian splitting specimen 8 respectively and apply horizontal pressure to the specimen; the upper loading plate 1, under the action of the actuator pressure head, moves along the guide column 5 toward the lower loading plate 2 and applies vertical pressure to the specimen, and at the same time, the deformation measuring device 7 measures the vertical deformation data of the specimen.

[0036] In summary, the Brazilian splitting test fixture 100 with lateral force provided by the utility model applies horizontal front-to-back loads by setting the front loading plate 3 and the rear loading plate 4, and measures the vertical deformation of the sample by setting a T-block to fix the longitudinal strain measuring device (deformation measuring device 7) on the same side of the upper loading plate 1 and the lower loading plate 2, thereby achieving the purpose of applying lateral constraints to rock materials and measuring vertical deformation.

[0037] The above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model.

Claims

1. A Brazilian splitting test fixture with lateral force, characterized in that: It includes an upper loading plate and a lower loading plate arranged opposite to each other, a front loading plate and a rear loading plate slidably connected to the lower loading plate, a guide column connecting the upper loading plate and the lower loading plate, a deformation measuring device arranged on one side of the upper loading plate, and a fixing block for fixing the deformation measuring device; the front loading plate and the rear loading plate are arranged opposite to each other between the upper loading plate and the lower loading plate, and the wall surfaces of the upper loading plate and the lower loading plate arranged opposite to each other are arranged in an inwardly concave arc shape.

2. The Brazilian splitting test fixture with lateral force according to claim 1, characterized in that: The front loading plate includes a first main body portion with a circular cross-section and a first base arranged below the first main body portion; the first main body portion includes a cylindrical portion and two protruding portions arranged on both sides of the cylindrical portion; the longitudinal section of the first base is an inverted T-shape; and a first slide rail for the first base to slide is provided on the lower loading plate.

3. The Brazilian splitting test fixture with lateral force according to claim 2, characterized in that: The rear loading plate includes a cylindrical second main body and a second base arranged below the second main body; the longitudinal section of the second base is in an inverted T-shape; and a second slideway for the second base to slide is arranged on the lower loading plate.

4. The Brazilian splitting test fixture with lateral force according to claim 3, characterized in that: The cross-sections of the first slide and the second slide are both in an inverted T shape; the first slide and the second slide are respectively arranged on both sides of the lower loading plate; the lengths of the first slide and the second slide are both less than 1 / 2 of the width of the lower loading plate, and the distance between the first slide and the second slide is greater than 20 mm.

5. The Brazilian splitting test fixture with lateral force according to claim 1, characterized in that: The deformation measuring device is a magnetostrictive sensor; the front loading plate is provided with a groove for the telescopic rod of the magnetostrictive sensor to pass through.

6. The Brazilian splitting test fixture with lateral force according to claim 1, characterized in that: The diameters of the front loading plate and the rear loading plate are 2-3 mm smaller than the diameter of the Brazilian splitting specimen.

7. The Brazilian splitting test fixture with lateral force according to claim 3, characterized in that: The first slideway and the second slideway have the same length.

8. The Brazilian splitting test fixture with lateral force according to claim 3, characterized in that: The second base is disposed in the middle of the second main body, and a horizontal distance from the outermost side of the second base to the outermost side of the second main body is greater than or equal to 5 mm.

9. The Brazilian splitting test fixture with lateral force according to claim 3, characterized in that: The first slideway and the second slideway are arranged at a middle position of the lower loading plate.

10. The Brazilian splitting test fixture with lateral force according to claim 1, characterized in that: The fixing block is arranged in a T-shape, and the number of the fixing blocks is two, and the two fixing blocks are arranged at the middle position of the same side of the upper loading plate and the lower loading plate.

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