厚松散浅埋煤层重复采动覆岩运移及地表沉陷规律研究

Overburden migration and surface subsidence law of repeated mining in thick loose and shallow buried coal seams

摘要: 【目的】为研究厚松散浅埋煤层重复采动条件下覆岩及地表移动规律，以内蒙古鄂尔多斯市某煤矿为研究背景。【方法】通过采用相似模拟对覆岩运移规律进行研究，以此对重复采动条件下地表的下沉特征进行总结。【结果及结论】研究结果表明，重复采动条件下覆岩的移动具有规律性，且表现为“弯曲—离层失稳—拉伸破坏—剪切破坏”;重复采动下地表最大下沉值偏向于开切眼侧，下沉曲线呈非对称性发展；该研究结论可为相似工程及地表沉陷治理工作提供借鉴。

Abstract: In order to study the law of overburden and surface movement under the conditions of repeated mining of thick loose and shallow buried coal seams, a coal mine in Ordos City, Inner Mongolia was taken as the research background.By using similar simulations to study the migration law of overburden rock, the subsidence characteristics of the surface under repeated mining conditions are summarized.The results show that the movement of overburden under repeated mining conditions is regular, and the performance is “bending-separation layer instability-tensile failure-shear failure”,and the maximum surface subsidence value is at the cutting hole side under repeated mining, and the subsidence curve is asymmetrically developed.