基于Comsol的煤层注水压力对湿润半径的影响研究

为研究煤层注水压力对煤层湿润半径的影响，为煤层注水技术中注水参数的选择提供参考，运用Comsol模拟软件对不同注水压力条件下煤层的孔隙水压和孔隙水渗流速度的分布进行了数值模拟，结果显示：注水过程中注水钻孔周围孔隙水压的总体分布规律是以钻孔为轴心呈椭圆形状向周围不断递减；孔隙水渗流速度在注水口附近最大，孔壁周围较小，并由注水孔向四周扩散减小。利用模拟数据拟合出煤层不同注水压力与湿润半径的指数型函数关系。

Study on the Influence of Water Injection Pressure on Wetting Radius of Coal Seam Based on Comsol

In order to study the influence of water injection pressure on the wetting radius of coal seam and provide references for the selection of water injection parameters in coal seam water injection technology, the distribution of pore water pressure and pore water seepage velocity under different water injection pressure of coal seam was numerically simulated by Comsol software.The results showed that during the process of water injection, the general distribution of pore water pressure around the borehole is decreasing to the surroundings in an elliptical shape with taking the drilling as the axis; the seepage velocity of pore water is the maximum near the water inlet and smaller around the pore wall, the diffusion decreases to all around from the water inlet. The exponential function relation between different water injection pressure and wetting radius of coal seam is fitted by using simulation data.