运用自行开发的岩层破断过程分析 (SFPA2D)系统模拟了多煤层开采时岩层的垮落过程。数值模拟结果表明 ,虽然上部煤柱的存在改变了上覆岩层结构 ,但岩层的垮落仍具有明显的周期性 ,地表的水平移动和垂直下沉仍具有明显的对称性 ;当垮落带高度达到上部煤柱后 ,可能出现大面积的垮落 ,产生较大的次生来压现象 ,从而影响下部长壁工作面的安全。通过和相似材料模拟以及理论分析结果的对比 ,本次数值模拟基本上反映了多煤层开采时采动岩体的动态发展过程 ,SFPA2D系统可以作为模拟采动覆岩破坏过程的一种新方法 The self-developed rock burst analysis (SFPA2D) system is used to simulate the caving process of the coal seam during the mining of multiple coal seams. The numerical simulation results show that although the existence of the upper coal pillar changes the overburden structure, the collapse of the rock formation still has obvious periodicity, and the horizontal movement and vertical subsidence of the earth surface still have obvious symmetry. When the height of the caving zone After reaching the upper coal pillar, there may be a large area of ​​collapse, resulting in a greater secondary pressure, thus affecting the safety of the lower part of the longwall face. By comparing with similar material simulation and theoretical analysis, this numerical simulation basically reflects the dynamic development process of the mining rock mass in the mining of multiple coal seams. The SFPA2D system can be used as a new method to simulate the failure process of mining overburden rock