恒昇9301工作面覆岩导水裂隙带高度及突水危险性

Height of Overburden Water-conducting Zone and Water Inrush Risk of Fully Mechanized Top-coal Caving Mining Workface 9301 at Hengsheng Coal Mine

以恒昇煤矿9301工作面开采为工程背景,采用理论分析和数值模拟相结合的方法,在确定9301综放工作面冒落带和导水裂隙带高度的前提下,分析了9301综放工作面回采过程覆岩破坏对上覆含水层和老空区积水的影响及其突水危险性。结果表明,9301综放工作面冒落带高度在15.97-25.39m之间,导水裂隙带发育高度在43.345-66.325m之间。9301工作面开采后所形成的最大导水裂隙带高度小于9+10号煤层与2号煤层之间的平均间距,9301工作面开采后上覆2号煤层整体处于弯曲下沉带范围内,基本不会受到2号煤层老空区积水的威胁,其防治水的重点为上覆K2灰岩和K5砂岩富水异常区。研究成果对保证9301工作面安全高效开采具有重要的工程指导意义。

Based on the engineering background of 9301 workface in Hengsheng Coal Mine,with the combination of theoretical analysis and numerical simulation,and on the premise of determining the height of caving zone and water-conducting zone of the fully-mechanized top-coal caving mining workface 9301,the influence of overburden destruction on the overlying aquifer and water accumulation of goaf during mining process and its risk of water inrush were analyzed.The results showed that the height of the caving zone is 15.97-25.39m and the water-conducting zone is 43.345-66.325m in the fully mechanized top-coal caving mining workface 9301.The maximum height of the water-conducting zone formed after mining in workface 9301 is less than the average distance between No.9+10 coal seam and No.2 coal seam.The No.2 coal seam in overburden is in the range of bending subsidence zone as a whole after mining of 9301 workface and will not be threatened by the water accumulation of goaf of No.2 coal seam basically.The key point of water control is the abnormal water-rich area of K2 overlying limestone and K5 sandstone.The research results have the important engineering application value to ensure the safe and efficient mining of 9301 workface.