In order to deeply and systematically study the failure mechanism and water inrush conditions of floor strata in working face mining under complex conditions,according to the engineering geological,hydrogeological conditions and rock physical and mechanical test reports of No.31040 lower protective layer working face in No.12 Coal Mine of Pingdingshan mining area,FLAC3D finite difference program was used to numerically calculate and analyze the floor disturbance failure depth and its evolution law under different condi-tions,and the calculation formula of floor rock mass disturbance failure depth was obtained,and the influence of No.31040 lower protec-tive layer working face mining on the development form of floor disturbance failure depth was analyzed and studied,and the scientific practicability of the fitting formula was verified which provides technical support and guidance for the safe mining under pressure in Pingdingshan mining area in the future.
维普
万方数据