采用自行研制的气液两相高精度渗透系统,进行了应力作用下煤体单相及气液两相渗透实验。实验结果表明:孔隙压力、体积应力对煤体水相渗透率影响呈非线性,并且在相对低应力下孔隙压对渗透率的作用更明显。有效应力作用下在其增加初期范围内,水相渗透率急速减小,损失率较大。 Adopting self-developed gas-liquid two-phase high-precision infiltration system, single-phase and gas-liquid two-phase infiltration experiments of coal under stress were carried out. The experimental results show that the influence of pore pressure and volume stress on the permeability of coal is nonlinear, and the effect of pore pressure on permeability is more obvious under relatively low stress. Under the effect of effective stress, in the initial stage of its increase, the permeability of water phase decreases rapidly and the loss rate is larger.