赵固矿区薄基岩煤层顶板突水危险性分析
首发时间:2015-04-15
摘要:为解决厚松散层薄基岩煤层开采过程中顶板突水的问题,采用理论分析与工程测试相结合的方法,对赵固矿区薄基岩煤层顶板突水危险性进行了分析。结果表明:新近系砂砾含水层和第四系砂砾含水层是顶板主要含水层,新近系底部的黏土层为顶板主要隔水层,阻隔水性能较好,可以起到阻水作用。按传统估算方法和地面钻孔方法,得到导水裂隙带的发育高度,给出了基岩局部变薄和黏土层局部缺失是顶板发生突水溃砂的主要原因。最后,提出了防治水的技术措施。
关键词: 采矿工程 薄基岩 顶板突水 地面钻孔探测 导水裂隙带
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Analysis of the Water Inrush risk from coal seam roof with Thin Bedrock in the Zhaogu Mining Area
Abstract:To solve water inrush of bedrock overburden aquifer during thin seam mining of thick loose layer, the water inrush mechanism from coal seam roof in Zhaogu mining area is studied by adopting the method of theory analysis and engineering testing. The results indicate that the Neogene and the Quaternary granule gravel aquifers are the main roof aquifers and the clay layer is the main roof aquifuge. The clay is semi-consolidated at low liquid limits and possesses good impermeability and poor mobility, preventing water and sand in the upper sand gravel aquifers from collapsing. The height of water flowing fractured zone is obtained by traditional estimation method and the ground drilling tests. The main reason of roof water inrush and sand inrush is the partial thinner bedrock part and the loss of clay layer. At last, the technical measures to prevent and control water are proposed.
Keywords: mining engineering;thin bedrock;roof water inrush;ground drilling tests;water flowing fractured zone
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