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Shearing box for testing anisotropy of rock sample structural surface and using method thereof

A rock sample, anisotropic technology, applied in the direction of applying stable shear force to test material strength, measuring device, strength characteristics, etc., can solve the problem that the shear strength anisotropy characteristics of rock structural planes cannot be obtained, and cannot be obtained Problems such as rock mass and difficult operation, to achieve the effect of enriching the research of anisotropic shear test, enriching the anisotropy of shear strength, and facilitating the detection of data

Active Publication Date: 2020-04-21
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]1. The cutting head of the existing direct shearing instrument is mainly suitable for the sample whose planar shape is rectangular, but the structural surface has anisotropic characteristics, and most of them can only Test the shear strength of the sample parallel to or perpendicular to the rectangular rock structural plane, so the shear strength in all directions of the structural plane cannot be obtained, so the anisotropic characteristics of the shear strength of the rock structural plane cannot be obtained, and the weakest rock mass cannot be obtained. Swipe direction of
[0006]2. For anisotropic shearing experiments, a cutting machine is usually used to cut a square structural surface sample into a circular sample, and by rotating the circular sample or rotating Anisotropic shear test is carried out by fixing the mold of the circular sample, which not only costs a lot, but also has a long construction period and difficult operation
[0009]Because of the constraints of the existing direct shear instrument shear box, there are few studies on anisotropic shear directly without changing the shape of the structural surface of the original sample , there is a need for a shear box for anisotropic shearing of the structural surface of rock mass, to solve the problem that those skilled in the art need to solve the anisotropic shear experiment without changing the structural surface shape of the original sample

Method used

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  • Shearing box for testing anisotropy of rock sample structural surface and using method thereof
  • Shearing box for testing anisotropy of rock sample structural surface and using method thereof
  • Shearing box for testing anisotropy of rock sample structural surface and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] An anisotropic shear cell for testing specimens of rock discontinuities such as figure 1 , Fig. 2, Fig. 3, Fig. 4, shown in Fig. 5, shearing box comprises upper shearing box 1, lower shearing box 10 and rotating body. The upper shear box 1 is composed of a top plate 4, an upper fixed frame 2, and four first fastening bolts 3, as shown in Figures 2 and 3; the lower shear box 10 is composed of a bottom plate 16, a lower fixed frame 11, and four first fastening bolts 3 Composed of two fastening bolts 12, as shown in Figure 4 and Figure 5; the four first fastening bolts 3 of the top plate are connected with the upper fixing frame 2 through bolt holes, and the four second fastening bolts 12 of the bottom plate are passed through the bolt holes It is connected with the lower fixing frame 11 by bolts, as shown in Fig. 3 and Fig. 5 .

[0063] Such as figure 1 , FIG. 2 , FIG. 3 , FIG. 4 , and FIG. 5 , the rotating body includes an upper rotating body 8 and a lower rotating bod...

Embodiment 2

[0076] A shear cell for testing the anisotropy of the structural plane of a rock sample and a method for using the same.

[0077] In this embodiment, refer to figure 1 , Fig. 2, Fig. 3, Fig. 4, and Fig. 5, the test square sample a × b × h = 100mm × 100mm × 100mm, at this time, the upper half cavity 5 and the lower half cavity 17 are directly used as placing shear samples chamber, such as figure 1 As shown, the method of use includes the following steps:

[0078] (1) Use an Allen wrench to loosen the four second fastening bolts 12, insert the Allen wrench into the lower hexagon bolt hole 13, rotate the lower dial 23 to align with the lower scale pointer 22, and tighten the four second fastening bolts 12, Put the lower half of the rock sample into the lower half cavity 17;

[0079] (2) Loosen the first fastening bolt 3, turn the upper shear box 1 upside down and insert the upper hexagonal wrench into the upper hexagonal bolt hole 7, rotate the upper dial 21 to align with the ...

Embodiment 3

[0082] A shear cell for testing the anisotropy of the structural plane of a rock sample and a method for using the same.

[0083] Present embodiment, as Fig. 7, Fig. 8, Figure 9 As shown, to test a smaller square sample a×b×h=75mm×75mm×75mm, it is necessary to clamp the upper size adjustment frame 24 in the upper rotating body 8, and the lower rotating body 18 to clamp the lower size adjustment frame 28, wherein, The upper size adjustment frame 24 is made up of the first size rectangular gap 25, the upper boss 26 and the upper size adjustment frame groove, and the lower size adjustment frame 18 is composed of the second size rectangular gap 30, the lower boss 29 and the lower size adjustment frame groove Composition, use allen wrench to loosen four first fastening bolts 3, open top plate 4 and put the upper boss 26 of upper size adjustment frame 24 into the first rectangular gap 6, the first size rectangular gap 25 and the upper size adjustment frame concave The groove const...

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Abstract

The invention discloses a shearing box for testing anisotropy of a rock sample structural surface. The shearing box comprises an upper shearing box, a lower shearing box and rotating bodies, wherein the rotating bodies are arranged in the upper shearing box and the lower shearing box, and rock samples are arranged in the rotating bodies; the upper shearing box is provided with an upper fixing frame, and an upper inner ring notch is formed in the upper fixing frame; a lower fixing frame is arranged in the lower shearing box, and a lower inner ring notch is formed in the lower fixing frame; therotating bodies comprise an upper rotating body and a lower rotating body; an upper outer circular boss at the top part of the upper rotating body is arranged in the upper inner ring notch of the upper fixing frame; a lower outer circular boss at the bottom part of the lower rotating body is arranged in the lower inner ring notch of the lower fixing frame; the upper rotating body rotates relativeto the upper fixing frame; and the lower rotating body rotates relative to the lower fixing frame. According to the shearing box device and a using method thereof, an anisotropic shear experiment canbe conducted without changing the structural surface shape of an original sample, the measurement is precise, the cost is low, the speed is high, the application range is wide, and the shearing box device is convenient to disassemble.

Description

technical field [0001] The invention relates to the technical field of rock mechanics chambers, in particular to a shear cell for testing the anisotropy of the structural plane of a rock sample and a method for using the same. Background technique [0002] The deformation and strength of the rock mass depend on the mechanical properties of the rock blocks and structural surfaces that make up the rock mass. The structural plane in the rock mass weakens the mechanical properties of the rock mass, affects the normal deformation, shear deformation and shear strength, determines the stability of the rock mass engineering, and leads to anisotropy of the rock mass, ranging from earthquakes to landslides , as small as the roof fall of underground engineering, and the side, generally move and develop along the structural plane. Therefore, the shear strength of structural plane of rock mass is often used as an important index to evaluate the stability of engineering rock mass. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24G01N3/02
CPCG01N3/24G01N3/02
Inventor 王其虎王杰元宙昊叶义成胡南燕杨帆贺耀华黄畅畅
Owner WUHAN UNIV OF SCI & TECH
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