掘进巷道周围煤体渗透率演化过程数值模拟  

Numerical Simulation for Permeability Evolution Process of Excavation Roadway Surrounding Rock Mass

作　　者：郭龙 于师建[2] 孙凯[2] 黄琪嵩[3] 

机构地区：[1]贵州安和矿业科技工程股份有限公司,贵州贵阳550023 [2]山东科技大学灾害预测与控制重点实验室,山东青岛266590 [3]中国矿业大学(北京)资源与安全工程学院,北京100083

出　　处：《煤矿安全》2015年第1期17-21,共5页Safety in Coal Mines

基　　金：山东省自然科学基金资助项目(ZR2011DM014)

摘　　要：煤岩体的渗透率对煤岩体和瓦斯所构成耦合系统的稳定性起着不可忽视的作用,进行掘进巷道周围岩体渗透率演化过程模拟研究对降低巷道掘进过程中煤与瓦斯突出事故发生率有一定意义。根据线性多孔弹性介质基本规律,建立渗透率和孔隙率动态方程;以岩体力学、渗流理论、传热学及热-流-固耦合理论为基础,建立含瓦斯煤层的热-流-固动态耦合模型。结合Comsol Multiphics和MATLAB对模型进行模拟,得出掘进巷道周围煤岩渗透率的演化过程,发现应力变化对渗透率变化的影响较大;在温度的影响作用下,渗透率演化规律和流-固耦合模型下渗透率演化规律有一定差异性。Coal- rock mass permeability is sensitive to the stability of coal and rock and gas coupling system,it has some engineering significance to study permeability evolution simulation of the tunneling lane surrounding rock,which could reduce accident rate of coal and gas outburst. We established permeability and porosity model according to linear porous elastic medium basic law,and established gassy coal heat- flow- solid coupling dynamic equation based on rock mass mechanics,percolation theory,heat transfer theory and heat- flow- solid coupling theory. Combined with Comsol Multiphics and MATLAB,we simulated the model,and achieved the evolution process of tunneling lane surrounding coal and rock permeability,and discovered that variation of stresses is central to interpreting coal permeability. The permeability is different between permeability evolution and flow- solid coupling model,because of temperature affect.

关 键 词：煤与瓦斯突出 孔隙率 渗透率 含瓦斯煤热-流-固耦合模型 数值模拟 

分 类 号：TD712[矿业工程—矿井通风与安全]