固体充填采煤充实率控制导水裂隙带高度发育研究

Study on Development Height of Water Flowing Fractured Zone Controlled by Solid Filling Percentage

为了研究固体充填采煤充实率对控制导水裂隙带高度发育的影响,分析了固体充填采煤覆岩移动变形特征,借助等价采高理论套用经验公式对固体充填采煤不同充实率导水裂隙带高度进行预计。运用数值模拟软件,通过对不同充实率导水裂隙带高度的模拟,建立了固体充填采煤导水裂隙带高度新的预计方法,其结果与套用经验公式预计的结果相吻合。工业性实验表明:固体充填采煤可以有效控制覆岩移动变形,顶板岩层整体保持其完整性,在煤层采高为3.5 m,采空区充实率为85%时,导水裂隙带高度在10 m左右的范围内,实测与预计结果基本一致。

Solid filling mining overburden rock movement and deformation characteristics are analyzed in order to study the affect of sol- id filling percentage on development height of water flowing fractured zone, different solid filling percentage is calculated with equiva- lent mining height theory and empirical formula. The new way to calculate the height of water flowing fractured zone is established by u- sing numerical simulation to simulate different solid filling ratio. The result is matching with the result of empirical formula. Industrial experiments show that the movement and deformation of the overlying strata can be effectively controlled by solid filling mining. The roof strata maintain its integrity. The water flowing fractured zone is in the range of about 10 m when mining height is 3.5 m and the mining filling ratio is 85%. Measured results are basically consistent with expected results.