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结合工程实例,对开滦赵各庄矿14水平(-1 225 m)开拓东大巷揭露的薄层煤岩体渗流演化过程进行数值模拟,通过调节渗透系数,获得了薄层煤岩体裂隙-孔隙双渗流在时间和空间上的孔隙水压变化过程,结果表明:渗流主要发生在充填裂隙143S薄煤层中,且随着渗透系数的增大,地下水体渗透距离增大,而渗透水压减小;143S薄煤层模拟水压过程曲线具有明显的峰值特征和时间滞后效应,而过渡层孔隙水压则不具有这些现象,这与所推导的一维裂隙-孔隙双渗流解答一致;渗透系数在10-8~10-10 m2/(Pa·s)数量级范围内,裂隙水压峰值与其滞后时间呈幂率型相关关系,143S薄煤层渗透系数在10-8 m2/(Pa·s)数量级范围较为切合实际.
Combined with the engineering example, numerical simulation was made on the seepage evolution process of thin coal and rock body exposed by the opening of 14 m (-1 225 m) in Zhaogezhuang Kailuan Mine. By adjusting the permeability coefficient, a thin layer of coal and rock mass fissure The results show that the seepage mainly occurs in thin seam filled with 143S fracture, and with the increase of permeability coefficient, the seepage distance of groundwater body increases, and the seepage pressure Decrease; 143S thin coal seam simulation hydraulic process curve has obvious peak characteristics and time lag effect, but the transition pore water pressure does not have these phenomena, which is consistent with the deduced one-dimensional fracture-pore dual seepage solution; permeability coefficient In the range of 10-8 ~ 10-10 m2 / (Pa · s), the peak value of crevice water pressure has an exponential relationship with its lag time, and the permeability coefficient of thin layer 143S is in the order of 10-8 m2 / (Pa · s) The range is more realistic.