Self-centering double shear test device and type II fracture toughness test method

A technology of double-sided shearing and testing device, which is applied in the direction of applying stable shearing force to test the strength of materials, can solve the problems of continuous shearing of rock samples, large tonnage and limited strength parameters, and achieves wide applicability and easy manufacturing. , the effect of simple structure

Active Publication Date: 2016-07-20
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many equipment for uniaxial test and triaxial test, and the tonnage is generally relatively large. There are few equipment capable of performing shear test. Shear test is divided into single-sided shear test and double-sided shear test. Most of the equipment is used for single-sided shear tests, which are used to study the mechanical properties of rock joint surface slippage, concrete strength, etc. Such equipment generally has a small horizontal thrust loading tonnage and is used for tests on rock masses with low strength It is suitable, but for higher strength hard rock, especially for large-scale hard rock samples, the tonnage is often not enough, resulting in the continuous shearing of rock samples
A small number of equipment that can carry out double-sided shear tests often have a major defect: the test equipment does not have the fun

Method used

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  • Self-centering double shear test device and type II fracture toughness test method
  • Self-centering double shear test device and type II fracture toughness test method
  • Self-centering double shear test device and type II fracture toughness test method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Shear shear test of rock samples.

[0028] Depend on figure 1 , figure 2 It can be known that the rock sample shear resistance test uses a self-centering double-sided shear test device, which includes a shear fixture, a horizontal loading frame, and a normal force loading device. The shear fixture includes a sample Box 1, shear briquetting block 2, first normal briquetting block 301 and second normal briquetting block 302, sample box 1 is made of high-strength steel, and support ears 4 are arranged on the outer edges of both sides, sample box 1 There are horizontal through holes and vertical through holes inside, the horizontal through holes are perpendicular to the vertical through holes, there is an observation hole in the middle of one side of the sample box 1, the rock sample 9 is placed in the center of the horizontal through hole, and the two ends of the rock sample 9 Install the first normal pressure block 301 and the second normal pressure block 30...

Embodiment 2

[0032] Embodiment 2: Testing of rock sample shear strength parameters.

[0033] The same self-centering double-sided shear test device as in Example 1 was used.

[0034] The main process of testing the shear strength parameters of rock samples is as follows:

[0035] Step 1, the rock sample 9 is installed in the center of the horizontal through hole of the sample box 1, and the first normal briquetting block 301 and the second normal briquetting block 302 are respectively installed at both ends of the rock sample 9. surface position, after adjusting the positions of the normal force loading device 8, the first normal briquetting block 301, the second normal briquetting block 302 and the rock sample 9, fix the position adjustment rod 7, and the test piece above the rock sample 9 The vertical through hole of the sample box 1 is installed with a shearing block 2, and then the self-aligning double-sided shearing test device is installed in the loading frame of the rock mechanics ...

Embodiment 3

[0045] Example 3: Test of Rock Mode II Fracture Toughness.

[0046] The same self-centering double-sided shear test device as in Example 1 was used.

[0047] The main process of rock mode II fracture toughness testing is as follows:

[0048] Step 1, the main process of the rock mode II fracture toughness test is as follows: firstly, double-notch cracks are prefabricated on the rock sample 9, the rock-soil sample 9 is a cube, the interval between the double notches is d, and the incision depth of the double notches is c, the width of the double notch is the same as that of the rock sample 9, the width of the rock sample 9 is B, the height of the rock sample (9) is a, the length of the rock sample 9 is L, and the interval between the double notches is d and The length of the shear compact 2 is the same, 0.3 c a 0.7 ;

[0049] Step 2, the rock sample 9 is installed in the center of the h...

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Abstract

The invention discloses a self-centering double shear test device which comprises a sample box.A horizontal through hole and a vertical through hole are formed in the sample box and are orthogonal.A first normal pressing block and a second normal pressing block are arranged at the two ends of the horizontal through hole respectively.The first normal pressing block abuts against one end of a position adjusting rod, and the other end of the position adjusting rod is connected with a threaded hole in a first counter-force support through a thread.The second normal pressing block abuts against a normal force loading device which is arranged on a second counter-force support.The first counter-force support and the second counter-force support are connected through a horizontal dowel bar.The invention further discloses a rock sample shear strength parameter test method and a type II fracture toughness test method.The self-centering double shear test device is simple in structure, easy to manufacture and high in applicability, has a self-balancing function, can be easily combined with an existing rock mechanical test system, and can be used for carrying out a rock type II fracture toughness test.

Description

technical field [0001] The invention relates to the field of rock mechanics tests, in particular to a self-centering double-sided shear test device, and also to a type II fracture toughness test method, which is mainly used for indoor rock double-side shear and type II fracture toughness tests. Background technique [0002] In the field of geotechnical engineering, it is usually through rock mechanics experiments to understand the mechanical properties, deformation and failure laws of rocks and rock masses, as well as various physical and mechanical effects caused by various structures on rock masses. Construction provides the required parameters. At present, rock laboratory tests mainly include uniaxial test, triaxial test, shear resistance test, etc., and rock mechanical parameters and strength indexes are obtained through these tests. [0003] At present, there are many equipment for uniaxial test and triaxial test, and the tonnage is generally relatively large. There ar...

Claims

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Application Information

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IPC IPC(8): G01N3/24
CPCG01N3/24
Inventor 高红苏方声张华胡元育
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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