The fault is one important factor for the stability of overburden strata caused by steeply inclined coal seam. The stress and displacement change of overburden strata caused by steeply-inclined coal seam mining activi...The fault is one important factor for the stability of overburden strata caused by steeply inclined coal seam. The stress and displacement change of overburden strata caused by steeply-inclined coal seam mining activity under faulting was simulated by FLAC2D finite differential program on the basis of Zhaogezhuang mining example belonging to Kailuan Mining Group. From the results, the stress and displacement clouding image after mining became complex because of the fault, that is, a kind of weak structural plane. The stress concentration region concentrated around the goaf, and also around the fault plane. As the mining depth increases, the stress and displacement within the fault zone change significantly. This movement and deformation characteristic of overburden strata can provide theoretical basis for the similar mining condition.展开更多
基金Project(20092142)supported by the Natural Science Foundation of Liaoning Province,China
文摘The fault is one important factor for the stability of overburden strata caused by steeply inclined coal seam. The stress and displacement change of overburden strata caused by steeply-inclined coal seam mining activity under faulting was simulated by FLAC2D finite differential program on the basis of Zhaogezhuang mining example belonging to Kailuan Mining Group. From the results, the stress and displacement clouding image after mining became complex because of the fault, that is, a kind of weak structural plane. The stress concentration region concentrated around the goaf, and also around the fault plane. As the mining depth increases, the stress and displacement within the fault zone change significantly. This movement and deformation characteristic of overburden strata can provide theoretical basis for the similar mining condition.
文摘分析了碎屑结构煤系地层岩体变形破坏的岩体力学特征及断裂带导水机理,认为岩体体积扩容是工作面顶板破坏内导水性增强、形成导水断裂带的根本原因.应用FLAC3D模拟分析了连续介质、大变形条件下急倾斜特厚煤层开采引起的覆岩体积应变分区特征,分为连续介质条件下的内部塑性破坏-压缩区、扩容区及外部弹性压缩区.依据垮落带形成过程中的体积变化特征,将连续介质条件下获得的内部塑性破坏-压缩区划为垮落带;扩容区划为断裂带;以分隔扩容区与外部弹性压缩区的体积应变0等值线最大高度确定防水煤柱高度.此方法应用于开滦赵各庄2137急倾斜特厚煤层开采工作面,确定上部防水煤柱高度为63.8 m.
