采动覆岩应力变化规律分析

Analysis of stress change law of overlying strata caused by mining

为了研究采动覆岩应力变化规律,采用理论研究和数值模拟,理论分析了采场底板岩体支承压力分布、采动裂隙场的空间形态;采用FLAC3D数值模拟了不同推进距离下水平剖面的应力分布和塑性破坏分布。研究得出,采动覆岩裂隙圈呈现典型的直接顶破断“O-X”型特征,采动塑性破坏区呈中间低和两端高的马鞍分布状态;底板和上覆岩层应力呈3个不同应力区域。

In order to study the stress variation law of mining overburden,theoretical research and numerical simulation were used to analyze the distribution of abutment pressure of rock mass of stope floor and the spatial form of mining fissure field,and FLAC 3D was used to simulate the stress distribution and plastic failure distribution of horizontal section under different advancing distances.It is concluded that the fracture zone of mining overburden presents typical "O-X" type characteristics of direct roof fracture,and the plastic failure zone of mining overburden presents saddle distribution with low middle and high ends;the stress of floor and overburden strata presents three different stress regions.