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对注水过程中水、气两相介质渗流对煤体的影响进行了理论分析,提出注水过程中的渗流对煤体的影响主要表现在水和瓦斯气体对煤体的物理化学作用和力学效应。分别对注水过程中水区和气区渗流介质的非稳态渗流对煤体的影响进行了分析,提出气体对煤体的影响主要表现在煤体的瓦斯吸附量上升,使煤体膨胀,表现出膨胀应力;水对煤体的影响主要表现在对降低煤体强度、提高煤体塑性和促进裂纹扩展;根据渗流的动态过程,分析了渗流对煤体影响的动态效应。
The effect of water and gas two-phase seepage on the coal body during the waterflooding process is theoretically analyzed. It is suggested that the seepage flow in the waterflooding process affects the coal body mainly in the physicochemical and mechanical effects of water and gas on the coal body. The influence of unsteady seepage flow of seepage medium in water area and gas area during water flooding on the coal body is analyzed respectively. It is suggested that the influence of gas on coal body is mainly due to the increase of gas adsorption capacity of coal body and the expansion of coal body. The influence of water on the coal body mainly manifests in reducing the strength of the coal body, improving the plasticity of the coal body and promoting the crack propagation. According to the dynamic process of seepage, the dynamic effect of seepage on the coal body is analyzed.