结构异性煤层注水裂纹扩展机制研究  

Crack Propagation Mechanism of Water Injection in Anisotropic Coal Seam

作　　者：冉星仕 RAN Xingshi(Shenmu Longde Mining Co.,Ltd.,Yulin 719300,China)

机构地区：[1]神木县隆德矿业有限责任公司,陕西榆林719300

出　　处：《煤矿安全》2020年第8期188-192,共5页Safety in Coal Mines

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。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.

关 键 词：结构异性 注水致裂 微观机制 层理/割理 弱面 裂纹拓展 

分 类 号：TD712[矿业工程—矿井通风与安全]