峰峰矿区正断层活化造成地表异常沉陷影响因素研究

Analysis on Influencing Factors of Abnormal Surface Subsidence Induced by Fault Activation in Fengfeng Mining Area

为了研究断层活化造成地表异常沉陷影响因素,建立了断层活化力学模型,并根据峰峰矿区地质条件利用数值模拟研究了断层倾角、煤层厚度、工作面推进长度、断层保护煤柱宽度、断层带充填物强度对地表沉陷的影响。研究结果表明:断层倾角越大,断层露头处地表下沉台阶落差越大,地表最大下沉值越大;煤层厚度越大,地表下沉值越大,断层露头处地表下沉台阶落差越大;工作面推进长度越大,地表下沉值越大,断层露头处地表下沉台阶落差越大,当工作面推进长度使地表下沉达到充分采动时,断层露头处地表下沉台阶不再增大;断层带充填物强度对地表沉陷影响不大。研究结果对分析断层影响下的地表沉陷规律具有一定借鉴作用。

In order to study the influencing factors of surface subsidence caused by fault activation,a fault activation mechanics model was established.According to the geological conditions of Fengfeng Mining Area,the effect of different factors,such as fault dip angle,coal seam thickness,working face advancement length,fault protection coal pillar width and filling strength in fault zone,on surface subsidence were studied with numerical simulation.The results show that,the bench drop of surface subsidence at the fault outcrop and the maximum subsidence value are positively related to the fault dip angle;the surface subsidence value and the bench drop of surface subsidence at the fault outcrop are positively related to coal seam thickness as well as the length of the working face,and when the full mining influence appears as the working face advances,the surface subsidence bench at the fault outcrop stops increasing;the strength of fault zone filling material has little effect on the surface subsidence.The research results can provide references for analyzing the surface subsidence law under the influence of faults.