潘三矿立井揭煤瓦斯抽采模拟研究

瓦斯抽采对于立井揭突出煤层起到重要的作用，准确的确定钻孔瓦斯有效抽采半径和合理的在待抽煤层中布置抽采钻场对煤层消突具有关键性作用。基于多孔介质中流体流动达西定律理论，采用COMSOL Multiphysics软件对该煤层瓦斯抽采进行了模拟。模拟结果表明，此煤层的瓦斯有效抽采半径为3 m，随着抽采时间的增加，煤层瓦斯压力逐渐的降低，但降低的速率会逐渐的减小。瓦斯抽采30天后，其残余的瓦斯压力为0．18 MPa ，这与现场实测的最大残余瓦斯压力0．2 MPa相接近，这说明了模型的可信性，其模拟结果可为瓦斯抽采设计提供参考。

Simulation of Methane Drainage during Coal Seam Uncovering in Pansan Coal Mine

Methane drainage has a very important effect on uncovering outburst coal seam .Accurate determina-tion of the effective drainage radius and reasonable arrangemnet of boreholes in coal seams plays a key role in elimination of coal and methane outburst .On the basis of Darcy ’ s law in porous media , the gas pressure under different extraction time was simulated by COMSOL Multiphysics .The results showed that the drainage radius is 3 m.With increase of extraction time , gas pressure reduces gradually and the reduce rate gradually gets smaller . After 30 days, the simulated residual gas pressure was 0.18 Mpa, which is close to gas pressure measured in -sito 0.2 MPa.Difference between the results are small , the model is feasible and the results can be used as a ref-erence to gas drainage design .