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顾桥矿松软突出煤层4煤层受砂岩裂隙水渗入,瓦斯抽采受到影响,为了研究区域赋水条件下煤层瓦斯抽采规律,使用COMSOL Multiphysics模拟不同含水率下瓦斯压力变化及抽采半径。模拟结果显示,含水率为1.73%和5.68%时,抽采半径分别为3.1 m和1.8 m,含水率越高瓦斯压力降低梯度越小。通过现场试验研究不同含水率及应力综合影响下的煤层渗透率及吸附特性,经顾桥矿4煤层现场试验证明,赋水煤层瓦斯抽采半径降低了70.9%,瓦斯抽采初始浓度降低了50%,单孔瓦斯抽采含量降低了75%。
In order to study the law of gas drainage in coal seams under the condition of water supply in the region, seam 4 coal seam in soft-outburst coal seam of Guqiao Mine is infiltrated by fissure water of sandstone and gas drainage is affected. COMSOL Multiphysics is used to simulate gas pressure variation and extraction radius at different water cut-off rates. The simulation results show that when the water cut-offs are 1.73% and 5.68%, the extraction radii are 3.1 m and 1.8 m, respectively. The higher the water cut, the lower the gas pressure drop gradient. Through the field test, the permeability and adsorption characteristics of coal seam under the influence of different moisture content and stress are studied. The field test of No.4 coal seam in Guqiao Mine shows that the radius of coal mining gas drainage is reduced by 70.9% and the initial concentration of gas drainage is reduced by 50% %, Single-hole gas extraction content decreased by 75%.