井下采空区储水复用防水密闭墙硐室安全评估

Safety Assessment of Waterproof Sealing Wall Chamber with Water Storage and Utilization in Underground Goaf

根据对井下采空区储水复用防水密闭墙硐室安全影响因素的分析,建立了以墙体自身强度、围岩强度、防水煤柱宽度、采空区水体性质和水压大小作为评估单元的定性和定量相结合的安全评估程序。在分析平板式防水密闭墙承压强度计算不宜采用圆柱形、楔形和倒截锥形防水闸门承压强度计算公式的基础上,构建了平板式防水密闭墙承压强度计算的物理模型和数学模型。根据李家壕煤矿防水密闭墙工程实际参数,定量计算了墙体硐室可承受的安全水头高度和所需的安全防水煤柱宽度,结合定性评估结果,校核李家壕煤矿防水密闭墙硐室安全性能满足井下采空区储水复用的要求。

According to the safety influence factor analysis of underground waterproof sealing wall of mine water storage and utilization in underground goaf,a safety assessment program with qualitative method and quantitative method based on strength of sealing wall itself and strength of surrounding rock and width of waterproof coal pillar and water properties and water pressure in goaf as appraisal unit is established. Based on the analysis of reasons that the calculation formula of bearing strength of cylindrical form sealing wall and wedge form sealing wall and inverted cut cone form sealing wall are not suitable for flat plate form sealing wall,the bearing strength calculation physical and mathematical model of flat plate form sealing wall is built. According to the actual parameter of underground water sealing wall in Lijiahao Coal Mine,based on both the calculated safety hydraulic head and safety width of waterproof coal pillar and the qualitative appraisal results,the safety performance of underground water sealing wall can meet the demand of mine water storage and utilization in underground goaf.