煤体双重孔隙瓦斯双渗流模型及无因次解算

发布时间：2018-05-31 07:08

本文选题：采矿工程 + 瓦斯　；参考：《岩石力学与工程学报》2017年01期

【摘要】：考虑瓦斯在煤层中的解吸、放散与渗流,利用达西定律分别描述煤基质与裂隙内的瓦斯运移,以煤基质与裂隙之间的传质通量为桥梁,发展煤体双重孔隙瓦斯双渗流模型,推导无因次模型,并运用有限差分法进行编程解算。结果表明:瓦斯压力、含量在裂隙内的下降速度要远大于煤基质;基质空间内瓦斯压力及含量的分布具有非均匀性及非稳态性;增大裂隙渗透性或煤层瓦斯压力,或减小煤壁表面瓦斯压力,均能导致瓦斯涌出速度的增大;煤体游离瓦斯含量对瓦斯涌出速度影响较小。结合潘一矿煤层瓦斯参数,对比模拟结果和实测数据,验证了煤体双重孔隙瓦斯双渗流模型的正确性。
[Abstract]:Considering the gas desorption, releasing and percolation in coal seam, using Darcy's law to describe the gas migration in coal matrix and fissure, and taking the mass transfer flux between coal matrix and fracture as bridge, the dual percolation model of gas with double pores in coal body is developed. The dimensionless model is deduced and the finite difference method is used to solve the problem. The results show that the gas pressure and content in the fissure decrease much faster than the coal matrix, the distribution of the gas pressure and content in the matrix space is non-uniform and unsteady, and the permeability of the fracture or the gas pressure in the coal seam is increased. Or reducing the gas pressure on the coal wall can increase the gas emission velocity, and the free gas content of coal body has little effect on the gas emission velocity. Combined with the coal seam gas parameters in Panyi Coal Mine, the correctness of the dual pore gas seepage model of coal body is verified by comparing the simulation results with the measured data.
【作者单位】：中国矿业大学(北京)资源与安全工程学院;太原科技大学环境与安全学院;
【基金】：国家重点基础研究发展计划(973)项目(2011CB201202) 中国矿业大学(北京)博士研究生拔尖创新人才培育基金项目~~
【分类号】：TD712

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