急倾斜多煤层开采地表移动规律与岩层破坏特征

急倾斜多煤层开采覆岩破坏和地表移动规律不同于缓倾斜煤层开采。采用相似材料模型实验对赵各庄矿急倾斜多煤层开采进行了模拟研究。通过对7次观测数据分析,得出了不同开采阶段地表移动变形规律及岩层破坏特征。实验结果表明:地表下沉盆地具有分区沉降突变性和沉陷分布格局控制性特点,岩层的空间破坏范围随着煤层开采层数的增加和开采深度的加大而扩大,其破坏特征主要表现为累积性和突变性。

Surface Movement Law and Rock Strata Failure in Mining of Steeply Inclined Multiple Coal Seams

The overburden failure and surface movement law during mining of the steeply inclined multiple coal seams are different from the gently inclined one.With the similar material simulation，the mining process of steep inclined multiple coal seams in Zhaogezhuang mine is simulated.Through analyzing 7 groups of observed data，the surface movement deformation law and overburden failure at different mining stages were obtained.The simulation results show that the surface subsidence basin has the features of paroxysmal partition subsidence and controlled subsidence distribution pattern.With the increase of the numbers of coal seam mining layer and the expansion of mining depth，the space of rock strata failure is enlarged.The main performance of rock failure is cumulative and paroxysmal.