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为研究低渗煤岩全应力-应变过程中的渗流特性,基于COMSOL Multiphysics数值模拟软件,结合达西定律与固体力学理论对张集矿的标准煤岩试件内部气体渗透特性进行数值模拟。结果表明:甲烷气体在煤样中的非饱和渗透过程中,气体压力非线性分布现象十分明显,但随着渗透时间推进,其气体压力分布规律逐步趋于线性;围压与屈服强度存在正相关的关系,与渗透率呈负相关的关系,此外,低渗煤岩的流固耦合渗流效应更加明显。
In order to study the seepage characteristics during the whole stress-strain process of low permeability coal, the gas permeation characteristics of the standard coal samples of Zhangji Mine were numerically simulated based on the Darcy’s law and solid mechanics theory based on COMSOL Multiphysics numerical simulation software. The results show that the non-linear gas pressure distribution is very obvious during the unsaturated permeation of methane gas, but the gas pressure distribution tends to linear with the penetration time, and the confining pressure and yield strength have a positive correlation The relationship between permeability and permeability is negative. In addition, the seepage effect of fluid-solid coupling of low-permeability coal is more obvious.