综放工作面覆岩采动破坏规律与充水特征分析

沙曲煤矿山西组煤层开采过程中,煤层顶底板砂岩含水层构成煤层开采时的直接充水含水层.这是沙曲煤矿山西组煤炭资源综放开采必须关注的一个问题.并且煤层上覆岩层由裂隙砂岩、泥岩和煤系共同构成,此类复合结构覆岩的工程地质性质和覆岩破坏特性不同,可能成为煤矿开采水害预防和地表塌陷离层注浆治理的有利条件,也可能会对开采造成安全问题.综合分析了沙曲煤矿山西组煤层剖面、平面和水力内边界的水文地质特征,通过GIS多因素拟合建立了煤层开采覆岩破坏"两带"高度的预计模型,在对山西组4#、5#煤层开采矿井充水条件研究的基础上,分析了充水水源和充水通道,并对煤层安全开采影响程度进行了评价,并针对性地提出了相应的防治水措施.

Analysis of the Overburden Failure and Water-filling Characteristics on Mechanization Caving Mining Face

In the process of Shanxi formation seam mining in Shaqu Colliery, the seam roof and floor sandrock aquifers constitute the direct discharge aquifers. This paper analysed the hydrogeological features comprehensively as viewed from cross-sections, plans and inner hydraulic boundaries of the basin. Several major factors of geology and mining were selected and a GIS prediction model was established for overburden failure. On the basis of study on the coal mine water inrush conditions of Shanxi formation 4^# and 5^# seam mining, the source and passageway of water inrush were analysed, and the influence degree of coal layer safety mining was assessed. At last, the appropriate measures on prevention and cure of water were submitted purposefully.