不同开采条件下断层滑移危险性的研究

Study on the risk of fault slip under different mining conditions

断层活化易引发井下的冲击地压事故,对煤矿的安全生产造成严重威胁。采用摩尔库仑破坏准则,建立了工作面分别沿断层上盘和下盘回采的数值计算模型。研究了工作面回采过程中,工作面和断层附近围岩的应力演化与应力分布特征,探讨了断层面上的正应力和切应力随工作面与断层距离变化的关系。认为采动应力引起的断层面的应力状态的突然改变是断层活化的主要原因,该研究成果为断层活化型冲击地压的治理提供可靠参考。

Fault activation is easy to cause underground rock burst accident, which poses a serious threat to the safety production of coal mine. In this paper, the Coulomb mole failure criterion is used to establish the numerical calculation model of mining along the fault hanging wall and footwall respectively. The stress evolution and distribution characteristics of the surrounding rock around the working face and fault during the mining process are studied. The relationship between normal stress and shear stress on the fault surface and the variation of the distance between the working face and the fault is studied. It is considered that the main cause of fault activation is the sudden change of stress state of fault surface caused by mining stress. The research results provide a reliable reference for the treatment of fault activated rock burst.