力拓煤矿下组10、11号煤层带压开采安全性评价

Safety Assessment for Lower Coal Group Nos.10,11 Coal Seams Mining under Safe Water Pressure of Aquifer in Lituo Coalmine

目前,力拓煤矿二叠系下统山西组1、2号煤层已采完,石炭系上统太原组10、11号煤层底板标高523m以下,已全面进入奥灰水带压开采区域,承压水对矿井安全生产的影响日益突出,因此,需对矿井10、11号煤层带压开采进行安全性评价。在分析了矿井水文地质条件的基础上,对矿井构造的导水性和煤层底板岩体的隔水性进行了评价,并采用突水系数法对10、11号煤进行了带压开采分区。认为Ⅰ区为相对安全区,但也存在发生突水的可能,须严格执行《防治水规定》以保障安全开采;Ⅱ区为相对危险区,必须在制定专门带压开采设计,进行必要的防治水工程,作好处置应对预案的情况下进行开采。

At present, the mining of Lower Permian Shanxi Formation coal seams Nos.1 and 2 is finished. While the Upper Carboniferous Taiyuan Formation coat seams Nos.10 and 11 below the elevation 523m are all within the scope of mining under safe water pressure of Ordovieian limestone aquifer, the confined groundwater impact on coalmine safety mining is increasingly prominent, thus the safety assessment for mining of coal seams Nos.10 and 11 is needed. Based on mine hydrogeological condition analysis have evaluated mine geological structure proximity water transmissibility and coal floor rock mass impermeability, and carried out coal seams Nos.10 and 11 mining under safe pressure zoning using water bursting coefficient method. Considered that the Zone I is relatively safe area, but water bursting possibility is existed, should strictly execute the ＂Coalmine Water Controlling Regulations＂ to guarantee safe coal mining; the zone Ⅱ is relatively dangerous zone, should draw up special design for mining under safe water pressure, carry out necessary water controlling projects, get done plans to deal with.