Investigation of the crack evolution characteristics of coal and rock bodies around boreholes during progressive damage based on stress threshold values

Tianjun Zhang,Xiang Ji,Mingkun Pang,Lei Zhang,Bing Ji,Wen Yang,Hongyu Pan

Theoretical and Applied Fracture Mechanics（2023）

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摘要

•Refined analysis of the deformation and damage processes of coal and rock bodies around boreholes using stress threshold.•The grouting material can better inhibit the propagation of the perimeter cracks.•The surface deformation localization zone of SH-CF is similar to that of “SH-complete + SH-hole”.•The strain energy density under load shows a clear localization pattern.

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关键词

Gas extraction, Crack evolution, Progressive damage, Stress threshold, Strain energy density

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