坚硬覆岩顶板条件下动力灾害危险性分析

Danger Analysis on Dynamic Disaster of Mining Face Under Hard Overburden Roof

宣东煤矿煤层上方存在一层厚达200m的坚硬覆岩,通过理论分析、现场实测等方法,认为坚硬覆岩是其动力灾害发生的主要动力源。坚硬覆岩的跨度随回采工作面的推进而不断增加,聚集大量弹性能,为下方工作面开采埋下很大的动力灾害隐患。在此基础上结合动力灾害的致因提出具有针对性的防冲防突措施。

Through theoretical analysis and field measurement, the hard overburden layer above the coal seam of Xuandong coal mine, with the thickness of 200m, was regarded as the main power source of underground dynamic disaster. The span length increased with the mining of the working face, gathering great elastic energy, which was a hidden dynamic danger for the mining face below. Considering the condition, combining the cause of underground dynamic disaster, specific methods to prevent the occurrence of rock burst and coal and gas burst were proposed.