矿井采空区地表塌陷的机理探究

Study on the mechanism of surface subsidence in mine goaf

文章以数值模拟的形式,指出采动诱发的水平应力与剪应力整体作用下,采场区岩层层面拉断的风险相应增加,施有应力的采场基本顶地表可能形成塌陷坑;基于格里菲斯强度能精确判别出历经第三水平开采活动后,地表岩层塌陷率偏低的结论,这提示采场内采动行为对地表沉降、凹陷过程形成的影响偏低。

In the form of numerical simulation,the paper points out that under the overall action of horizontal stress and shear stress induced by mining,the risk of rock layer fracture in stope area increases correspondingly,and collapse pit may be formed on the basic roof surface of stope with stress;based on Griffith strength,the conclusion that the surface strata collapse rate is low after the third level mining activities can be accurately identified,which indicates the stope The influence of mining behavior on the surface subsidence and the formation of depression is low.