超高水充填开采覆岩运移控制效果研究

Study on Control Effect of Overburden Migration in Superhigh Water Backfilling Mining

为探究不同参数下超高水充填开采覆岩运移控制效果,确定最佳的充填参数,以义能煤矿1302工作面为工程背景,结合现场监测和数值模拟等手段进行深入探究。通过UDEC模拟得出:当充填率一定时,水体积比越大,覆岩塑性区高度越高,应力集中程度越大,直接顶随着水体积比不断增大由弯曲向破断转变,在水体积比为95%时发生破断。通过现场实测发现开采过程中最大工作阻力为37.2 MPa,最大应力集中系数为1.81,回采巷道顶板最大下沉量为24.5 mm,围岩变形小,地表平均曲率为0.03 mm/m^(2),水平变形在-0.28~0.4 mm/m,地表变形程度小,地面建筑得到良好保护。

In order to explore the control effect of overburden migration in superhigh water backfilling mining under different parameters and determine the best backfilling parameters,takes 1302 working face of Yineng coal mine as the engineering background,combined with field monitoring and numerical simulation.UDEC simulation shows when the backfilling rate is constant,the larger the water volume ratio is,the higher the height of the plastic zone of the overburden is,the greater the stress concentration degree is.With the continuous increase of the water volume ratio,the direct roof changes from bending to fracture,and fracture occurs when the water volume ratio is 95%.Through field measurement,it is found that the maximum working resistance in the mining process is 37.2 MPa,the maximum stress concentration factor is 1.81,the maximum subsidence of the roof is 24.5 mm,the surrounding rock deformation is small,the average curvature of surfaceis 0.03 mm/m~2,the horizontal deformation is between-0.28 and 0.4 mm/m,and the degree of surface deformation is small,ground buildings are well protected.