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Rock type-I crack expansion whole process detection method based on three-point bending test

A technology of three-point bending and crack propagation, which is applied in the direction of applying a stable bending force to test the strength of materials, measuring devices, instruments, etc. It can solve the problems of inability to quantitatively determine cracks, macroscopic cracks, etc., and achieve accurate test results and easy operation Effect

Active Publication Date: 2017-01-04
CHINA UNIV OF MINING & TECH
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Problems solved by technology

This method can realize dynamic and high-speed acquisition, but due to the complexity of the crack growth process, the digital photography measurement method can only obtain the evolution characteristics of the strain field near the crack, but cannot quantitatively judge the macroscopic crack initiation of the crack and obtain the whole process of crack growth Information

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  • Rock type-I crack expansion whole process detection method based on three-point bending test
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  • Rock type-I crack expansion whole process detection method based on three-point bending test

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and examples.

[0021] The present invention is based on the three-point bending test method for detecting the whole process of rock type I crack propagation, specifically as follows:

[0022] Firstly, the rock mass of the test project is sampled and made into a flat cuboid specimen 1 (three-point bending specimen), and a type I crack 2 is prefabricated in the middle. The crack surface of the type I crack is perpendicular to the long side of the test piece and located in the middle of the long side. Generally, the depth h of the type I crack of the three-point bending specimen is 0.35-0.50 times the height H of the specimen.

[0023] A three-point bending test was performed on the specimen (see figure 1 ). First follow figure 1 Place the three-point bending specimen in the manner shown. Place the three-point bending test piece flat on the three-point bending testin...

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Abstract

The invention discloses a rock type-I crack expansion whole process detection method based on three-point bending tests. The rock type-I crack expansion whole process detection method comprises the following steps: prefabricating a type-I crack in the middle part of a three-point bending test piece, performing jetting speckling treatment in an appointed analysis area of the test piece, and performing three-point bending tests on the appointed analysis area; meanwhile, performing whole process continuous imaging on the appointed analysis area, acquiring digital images, and analyzing, so as to obtain horizontal tension strain epsilon h of the whole test process of the appointed analysis area of the three-point bending test piece; coring the three-point bending test piece after the tests, manufacturing a Brazilian split disc test sample, performing sharp Brazilian split disc tests on the Brazilian split disc test sample so as to obtain ultimate tensile strain epsilon T, and comparing different values of epsilon h so as to obtain time nodes that horizontal tensile strain in different positions meets the ultimate tensile strain epsilon T in the whole type-I crack expansion process of the three-point bending test piece; according to second strength principles, acquiring crack expansion whole process information of type-I cracks of rock under the action of three-point bending. The rock type-I crack expansion whole process detection method disclosed by the invention is simple and easy to operate and precise in test result.

Description

technical field [0001] The invention relates to a rock fracture mechanics test method, in particular to a method for detecting the whole process of rock type I crack propagation based on a three-point bending test. Background technique [0002] Regarding the research on the expansion process of rock cracks, it is more common at present to use high-speed cameras for continuous shooting, and then obtain relatively qualitative results. With the development of computer software, non-contact measurement has gradually become popular, and the most effective one should be the digital photographic strain field measurement technology based on the principle of digital speckle correlation method (DSCM). Digital photography deformation field measurement can be understood as a modern measurement technology that uses image acquisition equipment such as high-definition digital cameras to first take pictures of the observation target, and then uses digital image analysis software to perform ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/20G01N3/06
CPCG01N3/068G01N3/20G01N2203/0066G01N2203/0647
Inventor 苏海健韩观胜靖洪文蔚立元杜明瑞
Owner CHINA UNIV OF MINING & TECH
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