结构异性煤层注水裂纹扩展机制研究

冉星仕

结构异性煤层注水裂纹扩展机制研究

冉星仕

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- 发布日期: 2020-08-19

Crack Propagation Mechanism of Water Injection in Anisotropic Coal Seam

RAN Xingshi

摘要

摘要: 基于煤体结构异性特征,从微观角度数值分析注水煤体裂纹起裂、扩展及停止过程。研究结果表明:注水时煤体节理端应力集中,然后沿节理面(弱面)扩展,当剪应力小于煤面剪切强度时,裂纹停止;注水压力较大时,煤体不仅沿节理面扩展,而且还在裂纹尖端处导致煤体损伤,衍生新的裂纹路径。
- 结构异性 /
- 注水致裂 /
- 微观机制 /
- 层理/割理 /
- 弱面 /
- 裂纹拓展
Abstract: In this paper, based on the structural anisotropy characteristics of coal body, crack development of crack initiation, propagation and stop by water injecting into coal body is numerically analyzed in microscopic model. The results show that the stress at the joint end of coal body is concentrated during water injection, and then propagates along the joint surface (weak surface). As the shear stress is less than the shear strength of coal surface, the crack stops. When the water injection pressure is higher, the coal body not only propagates along the joint surface, but also causes the coal body damage at the crack tip, which leads to a new crack path.
- structural anisotropy /
- water injection cracking /
- micro mechanism /
- bedding/cleat /
- weak surface /
- crack propagation

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参考文献(17)

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结构异性煤层注水裂纹扩展机制研究

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出版历程

Crack Propagation Mechanism of Water Injection in Anisotropic Coal Seam

期刊类型引用(3)

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