Experiment method for observing three-dimensional square crack damage and strain field as well as experiment apparatus thereof

An experimental method and strain field technology, applied in the fields of surveying and geotechnical engineering, can solve the problems that the strain field cannot be tested, the problem of three-dimensional crack expansion has not been well solved, and the development cannot accurately observe the three-dimensional crack failure mode, etc., to achieve The effect of the production process is fast

Inactive Publication Date: 2018-08-14
HEBEI UNIV OF TECH
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Problems solved by technology

Nevertheless, the problem of 3D crack propagation has not been well resolved
Lin Peng, Zhou Yaneng, Li Zichang, et al. from the Department of Water Conservancy, Tsinghua University (Lin Peng, Zhou Yaneng, Li Zichang, et al. Experimental research on rock failure with three-dimensional preset single crack defects[J]. Journal of Rock Mechanics and Engineering, 2008, 27( s2): 3882-3887.) Use the developed electro-hydraulic servo dynamic and static triaxial testing machine to carry out the rock failure test research under the triaxial condition with thr...

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  • Experiment method for observing three-dimensional square crack damage and strain field as well as experiment apparatus thereof
  • Experiment method for observing three-dimensional square crack damage and strain field as well as experiment apparatus thereof

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Embodiment 1

[0033] In this embodiment, the experimental method for observing three-dimensional crack damage and strain field, the specific steps are as follows:

[0034] 1. The production of the mold and the crack: the mold is made of unsaturated resin, and the length, width and thickness of the mold are 100, 100 and 50mm respectively. The upper mouth of the mold is open and the lower end is closed, and small holes are drilled on both sides of the mold. Using a thin aluminum sheet to simulate primary cracks, the propagation and penetration process of parallel three-dimensional crack groups under uniaxial compression was studied. According to the needs of the experiment, the length, width and thickness of the thin aluminum sheet are cut to 30, 25 and 8mm respectively. The inclination angle of the fracture surface (the angle with the loading direction) is 45°. Fix the prefabricated rectangular slit inside the mold by passing a thin cotton thread through the small hole, and seal the small ...

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Abstract

The invention relates to an experiment method for observing three-dimensional square crack damage and a strain field as well as an experiment apparatus thereof. The method combines a particle image velocity measurement method and a compression test, employs artificial injection mold to produce a three-dimensional built-in square crack test piece, uniform tracer particles can be subjected to layered incorporation, the damage characteristic of the three-dimensional built-in square crack under single-shaft compression can be observed and the strain field visualization is realized, the understanding on the three-dimensional built-in crack fracture damage is increased, and the method is simple and easy to carry out, and cost is low. The experiment apparatus employs a brittle and transparent resin material to simulate the practical condition of the practical rock crack, and can determine the strain field by aiming at the three-dimensional built-in square crack test piece.

Description

technical field [0001] The invention relates to the technical fields of surveying and mapping and geotechnical engineering, in particular to an experimental method and an experimental device for observing three-dimensional square crack damage and strain field. Background technique [0002] From the rock fracture mechanism of the earthquake source, the destruction of civil engineering and nuclear mine engineering, the exploitation of oil and gas, and the storage and isolation of nuclear waste, all of them are closely related to the law of crack expansion in rocks. During the construction process of large-scale rock mass engineering or when the external load changes, new cracks often initiate from the tip of the original crack, expand and even penetrate with adjacent cracks, and finally lead to the destruction of the entire rock mass. The strength reduction of rock mass caused by crack expansion not only affects the stability of rock mass, but also can lead to many engineering...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N21/84G01N1/38G01N1/44
CPCG01N1/38G01N1/44G01N3/08G01N21/84G01N2203/0019
Inventor 熊骋望马国伟董茜茜
Owner HEBEI UNIV OF TECH
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