采煤过断层期间围岩变形破坏数值模拟研究

Numerical Simulation Study on Deformation and Failure of Surrounding Rock During Coal Mining Through Faults

为有效控制煤体掉落风险,降低采煤过断层期间的不良影响,通过理论分析结合数值模拟对工作面过断层围岩破坏情况进行分析,发现随着工作面的推进,工作面与断层之间的距离逐渐减小,断层对顶板岩层的影响逐渐增大。在底面通过顶板之前,无论是前方煤壁的应力减小区还是增大区都在持续向前推进,而应力集中区的范围呈现出先增大后减小的趋势,为后续过断层围岩支护提供一定的参考。

In order to effectively control the risk of coal falling and reduce the adverse effects during coal mining through faults,theoretical analysis combined with numerical simulation was used to analyze the damage of the surrounding rock of the working face passing through faults.It was found that as the working face advanced,the distance between the working face and the fault gradually decreased,and the impact of the fault on the roof rock layer gradually increased.Before the bottom passes through the roof,both the stress reducing and increasing areas of the front coal wall continue to advance,and the range of the stress concentration area shows a trend of first increasing and then decreasing,providing a certain reference for subsequent support of surrounding rock passing through faults.