煤矿井下水流裂缝带发育扩展情况探测

Detection of Development and Expansion of Water Flow Fracture Zone in Underground Coal Mine

煤矿井下水流裂缝带的发育及扩展对安全回采起着至关重要的作用。以袁大滩煤矿为例,为了达到在采煤的同时保护地下水系统的目标,施工了3个探测钻孔,利用钻孔冲洗流体消耗量判别采煤工作面水流裂缝带发育扩展情况。结果表明,2号煤层裂缝带长度在104.36~110.37 m,采高为3.2 m时,裂采比为32.61~34.49 m。水流裂缝带顶部在直罗组地层范围内,距离白垩系地层底部151~157 m,距离第四系萨拉乌苏组地层底部189~195 m。采动未对白垩系含水层、萨拉乌苏组含水层造成扰动与损害。应加强对裂缝带发育扩展范围内的直罗组地层水防治工作。

The development and expansion of water flow fracture zone in coal mine plays an impor⁃tant role in safe mining.Taking Yuandatan Coal Mine as an example,in order to achieve the goal of protect⁃ing groundwater system while coal mining,three detection boreholes were carried out,and the develop⁃ment and expansion of water flow fracture zone in coal mining face were judged by using the consumption of drilling flushing fluid.The results show that the fracture zone length of No.2 coal seam is 104.36~110.37 m.When the mining height is 3.2 m,the fracture-mining ratio is 32.61~34.49 m.The top of the water flow fracture zone is within the Zhiluo Formation,about 151~157 m from the bottom of the Cretaceous strata,and about 189~195 m from the bottom of the Quaternary Salawusu Formation.Mining did not cause distur⁃bance and damage to the Cretaceous aquifer and the Salawusu Formation aquifer.The prevention and con⁃trol of formation water in Zhiluo Formation within the development and extension range of fracture zone should be strengthened.