煤层注水湿润煤体的研究

STUDY OF WETTING COAL BY SEAM INFUSION

从煤层的结构及水在煤层孔裂隙中的渗透特性，建立起了理想渗透介质的模型．认为煤层注水湿润煤体增加煤体水分，不仅有沟通大裂隙、孔隙中的渗透，还有组合孔隙、死端孔隙及微孔隙中压差、毛细和扩散运动的作用．根据流体动力学原理，依次建立起了渗透、压差、毛细和扩散运动的数学模型及用有限元求解的泛函方程．并结合３个实例的有限元计算说明了其应用及对实际煤层注水的指导作用．

A model of ideal permeable medium was established based on structure of coal seam and filtration characteristics of water into pores, cracks and fissures in coal seam. It was considered that water infusion can increase moisture of coal solid; it can connect cracks and pores, and it also has the effect of combining pores, producing differential pressure between pores in the dead end and micro-pores, and inducing capillary and dispersing movement. According to the principles of flow dynamics mathematic models of filtration, pressure difference, capillary and dispersion movement, and the functional equation were established. The application of finite element compution in three examples showed that it can give guidances to water infusion.