Datong Coal Mine Group Co., Ltd.

针对整合矿井上覆不明采空区工作面易发生老空水害的工程难题,以重组整合矿井胜利煤矿太原组10号煤层开采为例,运用力学模型分析、经验公式计算以及数值模拟方法,综合分析研究了10号煤层及上覆6号、2号煤层开采后的导水裂隙带高度、底板破坏带深度情况。研究结果表明:10号煤层及上覆6、2号煤层开采后的最大导水裂隙带高度分别是54.94、30.49、33.67 m,最大底板破坏带深度分别是12.24、3.12、1.25 m,基于其相对空间位置,判断出2号煤层采空区积水不会影响10号煤层开采,而6号煤层采空区积水会直接进入10号煤层,对10号煤层安全生产造成重大影响;利用调查资料、地面物探、井下物探相结合的方法对6号煤层不明采空区积水范围进行了精准确定,为后续钻探放水提供了依据,为相似工程条件下上覆采空区突水危险性分析及积水范围探测提供借鉴。

Aimed at the engineering problems of goaf water disaster easy to happen in the goaf of the unknown goaf in the mine, taking No.11 coal seam of Taiyuan Formation of Shengli Coal Mine which belonged to reorganization and integration mine as an example, the mechanical model analysis, empirical formula calculation an d numerical simulation method were adopted, height of water flowing fractured zone and depth of failure zone of floor were analyzed and studied after the No.10 coal se am was mined and the overlying No.6 and No.2 coal seams were mined.Results showed that the maximum height of water flowing fractured zone was respectively 54.9 4, 30.49 and 33.67 m when No.10, No.2 and No.6 coal seams were mined, and the maximum floor failure zone depth was respectively 12.24, 2.55 and 1.25 m, based 0 n the relative spatial location of them, it was concluded that the water in the goaf of No.2 coal seam would not affect the mining of No.10 coal seam, and the water in th e goaf of the No.6 coal seam would come into No. 10 coal seam, and could bring great influences on the safety production of No. 10 coal seam. The scope of accumulate d water in unknown mined out area was accurately determined combine with several methods, including survey data, surface geophysical prospecting and underground geophysical prospecting, all this could provide references for risk analysis and range detection of water inrush in overlying unknown mined out area.