巷道对煤层瓦斯含量的影响范围探讨

Discussion on incidence of underground roadway to gas content of coal seam

为了煤矿安全生产,许多矿建立了井下瓦斯抽放系统。为了设计瓦斯抽放最佳方案和准确预测抽放区煤层瓦斯含量的分布情况,需要进行井下瓦斯抽放数值模拟。但是,由于井下巷道的存在使模拟模型的边界条件发生了不均匀变化,要确定模拟边界就必须考虑井下巷道的影响范围问题。从数值模拟角度,利用COMET2模拟软件,针对两种不同渗透率的储层模型,通过巷道存在180 d、360 d和730 d后对煤层瓦斯含量影响情况的模拟分析,探讨了巷道对煤层瓦斯含量的影响范围,得到了一些初步认识。

For the safe production of coal mine,many coal mines have established various gas drainage systems,For the design of the optimum gas drainage scheme and the accurate forecast of the gas state in the target, a numerical simulation for gas drainage is necessary. But one of the main problems is that in the design of gas drainage schemes there is no scientific basis, so the study for the incidence of underground roadway to gas content in the coal seam is performed in the view of the numerical simulation in this paper. Via the simulation software Comet Ⅱ, for two reservoir models with different permeability, a simulation study has been completed. By the analysis for the incidence of underground roadway, after it exists for 180, 360, and 730 days, some view has been obtained.