蒙西深部复合水体下高强度安全疏控水开采技术

Technology of Dewatering and Controlling for High Strength of Mining under Deep Composite Water in Mengxi

针对蒙西矿区纳林河二号矿井开采深度大,主采煤层受多层含水层威胁、开采强度大的特点,在确定该矿区水害威胁类型的基础上,采用数值模拟、物理相似模拟和经验类比的方法研究了主采煤层覆岩破坏高度,分析了各含水层的充水规律,提出了复合水体下安全"疏控水"技术方案。研究结果表明:蒙西矿区开采主要防治水问题是复合水体威胁下安全采煤;预计得到纳林河二号矿井3-1煤开采垮落带高度按照垮采比4.5倍选取,裂采比按照15倍选取;提出的复合水体下"疏控水"采煤的总体方案为对于白垩系志丹群含水层采取"顶水开采"的方案,对于直罗组底部砂岩含水层采取"边回采边疏降"的控水方案,对于延安组含水层则采取"钻孔疏干或疏降与回采疏干或疏降相结合、先疏后采与边疏边采相结合"的疏水方案。

Aiming at characteristics of large mining depth,multilayer aquifer threatening the main coal seam,and high intensity of mining In Nalinhe No. 2 mine of Mengxi mining area,based on determination of the type of water disaster,the numerical simulation,physical simulation and experience similarity method were adopted to study the overburden failure height of main coal layer. The law of water aquifers was analyzed,and the ＂dewatering and control＂technology under composite water was proposed. The research results showed that： the water prevention in Mengxi mining mainly exists in coal mining under composite water. It is predicted that the height of failure zone during mining of 3-1 coal in Nalinhe No. 2 coal mine was selected as4. 5 times of the caving-height ratio and 15 times of the facture-height ratio. Based on The proposed＂dewatering and control＂technology,the Cretaceous Zhidan group aquifer chose the＂mining under water＂scheme,Zhiluo bottom sandstone aquifer took＂mining with dewatering＂,and Yanan group aquifer adopted the combined scheme of＂borehole dewatering or drainage,mining dewatering or drainage,mining after drainage and mining with drainage＂.