摘要
通过耦合方程建立应力场和瓦斯运移场之间的耦合关系,得到考虑Klinkenberg效应和不考虑Klinkenberg效应时两种气—固全耦合模型的控制方程组,分别应用于同一单孔瓦斯抽采数值模型,对比分析了Klinkenberg效应对瓦斯压力、渗透率和孔隙率动态变化的影响规律,结果表明:Klinkenberg效应通过增大煤层渗透率,有助于瓦斯抽采,且随抽采时间的延长效果更加显著;煤化程度较高的煤在抽采时间较长(大于4个月)时需要考虑Klinkenberg效应的影响;由于渗流场和应力场的强耦合作用,孔隙率、渗透率、煤层瓦斯压力受抽采作用的影响范围同步变化。
The coupling relationship between stress field and gas migration field was built by the coupling equation, and thecontrol equation sets of two kinds of gas-solid full coupling model with and without considering the Klinkenberg effect wereobtained, they were respectively applied to the numerical model of the same single-hole gas drainage, and the influence of theKlinkenberg effect on the dynamic change of the gas pressure, permeability and porosity of the coal seam was analyzed. Theresults showed that the Klinkenberg effect was helpful for gas drainage by increasing the permeability of the coal seam, and theeffect was more significant with the prolongation of the drainage time; the influence of the Klinkenberg effect should beconsidered for the coal with higher degree of coalification and longer drainage time （more than 4 months）; the influence range ofthe porosity, permeability and gas pressure of the coal seam changed simultaneously due to the strong coupling between theseepage field and stress field.
出处
《矿业安全与环保》
北大核心
2016年第5期14-17,22,共5页
Mining Safety & Environmental Protection
基金
云南省应用基础研究计划项目(青年项目)(2015FD053)
