多煤层开采时岩层垮落过程的数值模拟

NUMERICAL SIMULATION OF STRATA FAILURE PROCESS WITH MULTI COAL STRATA MINED

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 。

The strata failure process is simulated with multi coal strata mined by Strata Failure Process Analysis System, which is developed by ourselves. The result of numerical simulation reveals that though the upper pillar changed the structure of overburden stratum, the stratum failure is of periodic law and surface subsidence of symmetry obviously with the advance of longwall face. Large scale failure may cause large sub weighting to affect the longwall face, when the height of failure arrives at upper pillar. Compared with similar material model test and theoretical analysis, the numerical simulation reflects the dynamic progress process of mining rock. It is pointed out that SFPA 2D is a new approach to research the rock stratum movement.