煤层注水中湿润半径和渗流速度演化规律的探索

The evolution rule of wetting radius and permeability velocity of water injection in coal mine

本文基于达西定律,扩充了煤层注水渗流的基础理论,应用平行平面流煤层注水渗流模型,研究了煤层注水过程中湿润半径和渗透速度演化规律,得到了其解析表达式,并通过数值计算得到湿润半径的预测值。利用郑煤集团白坪矿采煤工作面实测数据,计算了白坪矿采煤工作面煤层的渗透率和注水速度。在此基础上,给出了煤矿开采不同时期,对应的不同煤层压力下,采用不同注水压力时所需的注水时间,对降低矿井粉尘有一定实用价值。

Based on Darcy’s law,this paper expands the basic theory of coal seam water injection seepage,establishes a coal seam water injection seepage model using parallel plane flow,studies the evolution rule of permeability radius and velocity in coal seam,and obtains the analytical expression formula in terms of the shortage problem in the seepage theory of water injection in coal mine.Using the theoretical and the actual measured data in Baiping mine of Zhengmei Group,this paper calculates the permeability and water injection rate of the actual seam face in Baiping mine.On this basis,the water injection time is predicted in the difference condition of water injection pressure and coal seam pressure,which has a certain practical value for reducing mine dust.