Test method for researching rock wedge instability failure under high stress

Abstract

The invention provides a test method for researching rock wedge instability failure under high stress. In the test, a uniaxial testing machine is adopted to load a Y-shaped cross combined structure surface test sample; before an experiment, speckle identification points are sprayed on the surface of the sample, point cloud data of two structure surfaces are obtained through scanning, and JRC values of the two structure surfaces are calculated; in a loading process, a surface displacement field and an acoustic emission signal of the Y-shaped cross combined structure surface test sample are monitored to obtain deformation and acoustic emission precursor characteristics of instability failure of the Y-shaped cross combined structure surface test sample; the sample is loaded until the sample is damaged to obtain peak normal stress of the sample; shear stress components of the two structure surfaces are calculated according to the peak normal stress, and comparative analysis is carried outon the shear stress components and the shear strength of the structure surfaces; and multiple groups of tests are repeatedly carried out under different structural surfaces JRC, included angles and loading modes, and the structural surface shear strength, the displacement field and the acoustic emission signal change rules before the rock sample is damaged are inspected, so that the comprehensivecriterion of rock wedge instability damage is established, and reference is provided for rockburst disaster early warning in rock engineering.

Description

Technical field: [0001] The invention belongs to the technical field of rock mechanics, in particular to a test method for studying the instability and failure of a rock wedge under high stress. Background technique: [0002] With the increasing scarcity of shallow energy and resources, deep mining has become an inevitable trend in the development of the world's mining industry. However, under the conditions of deep mining, the problem of rockburst disasters is prominent. Rockburst is a phenomenon of dynamic damage to surrounding rock caused by the excavation and unloading of underground engineering rock mass under the condition of high ground stress. Device security poses a huge threat. In the prior art, the schematic diagram of a rock burst occurring in a rock wedge under high stress extrusion is as follows: figure 1 shown. [0003] The repeatability of rockburst disasters is not strong. Physical experiments are used to study rockbursts in the laboratory, which has sig...

AI Technical Summary

Problems solved by technology

The commonly used compression or direct shear test schemes for rock samples with single or parallel structural planes cannot simulate the occurrence conditions of this type of rockburst, and cannot specifically study the interaction between cross-combined structural planes under different stress states. It may cause misunderstanding of the actual rockburst conditions and misjudgment of the danger level of rockbursts

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