采动影响下陡倾断层面对岩移的屏障效应及其发生机制

为研究采动影响下陡倾断层面对岩体移动的屏障效应及其发生机制,基于数值模拟方法,分析了采空区分别位于断层面上盘和下盘时,断层面对围岩位移场和应力场的影响。结果表明:假定条件下,采动影响范围内的断层面破坏了岩体移动和变形的连续性和协调性,影响了围岩应力的传播,具有一定的屏障效应;断层面上盘开采比在下盘开采引起的断层面两侧围岩位移差和应力差更大,采动产生的卸围压效应更强,并揭示了陡倾断层面对岩移屏障效应的发生机制。研究成果对于断层影响下岩体移动范围的确定具有重要的意义。

BARRIER EFFECT AND OCCURRENCE MECHANISM OF STEEP FAULTS ON ROCK MOVEMENT UNDER THE INFLUENCE OF MINING

In order to study the barrier effect and its mechanism of rock mass movement caused by mining, based on the numerical simulation method, the influence of fault on displacement field and stress field of surrounding rock is analyzed when the goaf is located in the hanging wall and footwall respectively. The results show that the fault plane within the influence range of mining destroys the continuity and coordination of rock mass movement and deformation, affects the propagation of surrounding rock stress, and has obvious barrier effect; the displacement difference and stress difference of the surrounding rock on both sides of the fault plane caused by the hanging wall mining on the fault plane are larger than those caused by the footwall mining, the unloading confining pressure effect caused by the mining is stronger, the barrier effect of the rock movement caused by the hanging wall mining on the fault plane is stronger. The research results are of great significance to the determination of rock mass movement range under the influence of faults.