松散弱含水层下开采防砂煤柱留设研究

Study on retention of sand proof coal pillars for mining under loose and weak aquifers

煤矿松散弱含水层下采煤,极易发生溃水溃砂事故。通过电法勘探、水文地质勘探、钻孔抽水试验等多种技术手段,查明工作面上覆岩层水文地质结构,确定防隔水煤柱类型、采动等级。采用经验公式、相似矿区工程类比法及实测数据分析,确定工作面回采期间垮落带、裂隙带“两带”参数值,为防砂煤柱合理留设提供依据。王行庄煤矿15021工作面的工程实践表明,防砂隔水煤柱留设研究结果合理可靠,能够实现工作面安全回采。

Coal mining under loose and weak aquifers is prone to water-burst and sand-burst accidents.The hydrogeological structure of the overlying strata must be found out,by using various technical methods such as electric exploration,hydrogeological exploration,drilling and pumping test,etc.The type of waterproof coal pillar and mining level requirements were determined.By using empirical formulas,similar mining area engineering analogy methods,and analysis of measured data,the parameter values of the"two zones"of collapse zone and fracture zone during the mining period of the working face were determined,providing a basis for the reasonable setting of sand control coal pillars.The engineering practice of the No.15021 working face in Wangxingzhuang Coal Mine showed that the research results on the retention of sand control and waterproof coal pillars were reasonable and reliable,and can achieve safe mining of the working face.