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采用实验及数值模拟的方法,实验了不同破坏类型煤体在不同水分、不同围压下渗透特性的变化情况,模拟了注水后,不同围压条件下煤体透气性的变化情况。结果表明,煤体水分、围岩应力的变化对煤体渗透率产生影响,呈负指数关系;水分、围岩应力对煤体渗透特性影响机理存在差异性:水分占据煤体的渗透容积,围岩应力降低煤体的渗透容积;软、硬煤体渗透特征存在差异性:相同围压条件下硬煤渗透容积大于软煤,软煤对围岩应力影响更加敏感。
Experimental and numerical simulation methods were used to study the variation of permeability of different types of coal under different water pressures and confining pressures. The changes of permeability of coal under different confining pressures were simulated. The results show that the variation of coal moisture and surrounding rock stress has an effect on the permeability of coal, showing a negative exponential relationship. The mechanism of the influence of water stress and surrounding rock stress on the permeability characteristics of coal is different: the water content occupies the infiltration volume of coal, Rock stress reduces the infiltration volume of coal; the permeability characteristics of soft and hard coal are different: the permeability of hard coal under the same confining pressure is larger than that of soft coal, and soft coal is more sensitive to the influence of surrounding rock stress.