特厚煤层分层综放开采覆岩破坏规律数值模拟

 以华亭陈家沟煤矿综放采场实测导水裂隙带发育高度成果数据为基础，应用FLAC3D反演计算模拟分层综放开采引起的煤层覆岩破坏规律，并与实测数据进行了对比分析得出：分层综放开采后覆岩移动破坏形成“拱”式承载结构，拱脚压应力高度集中；导水裂隙带发育形态也近似为“拱形”，与实际探测高度拟合度较好；分析了开采过程中覆岩的位移场、应力场和塑性破坏区分布规律。研究结果可为深入研究分层综放开采覆岩破坏规律提供借鉴。

Numerical Simulation of Overburden Strata Failure Law in Fully Mechanized Top Coal Caving Mining in Slices of Ultra Thick Seam

Base on the development height data of the water flow fractured zone measured in the fully mechanized top coal caving mining face of Huating Chenjiagou Mine,the FLAC3D inverse calculation was applied to simulate the overburden strata failure law of the seam caused by the fully mechanized top coal caving mining in the slice of the seam.The simulation data and the measured data were compared and analyzed.After the fully mechanized top coal caving mining in the slice of the seam,the failure and deformation of the overburden strata would form "arch" type loading structure and the pressure stress of the arch legs would be highly concentrated.The development pattern of the water flow fractured zone would be also as "arch" and could be well fitted with the actual detected height.The displacement field and stress field of the overburden strata and the distribution law of the plastic failure zone during the mining process were analyzed.