含瓦斯煤热流固耦合渗流实验研究  

Experimental study of thermo-fluid-solid coupling seepage of coal containing gas

作　　者：尹光志[1,2,3] 蒋长宝[1,2,3] 许江[1,2,3] 彭守建[1,2,3] 李文璞[2] 

机构地区：[1]煤矿灾害动力学与控制国家重点实验室(重庆大学),重庆400030 [2]重庆大学资源及环境科学学院,重庆400030 [3]重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室,重庆400030

出　　处：《煤炭学报》2011年第9期1495-1500,共6页Journal of China Coal Society

基　　金：国家重点基础研究发展计划(973)资助项目(2011CB201203);国家自然科学基金资助项目(50874124);重庆大学"211工程"三期创新人才培养计划建设项目(S-10220)

摘　　要：以晋城煤业集团赵庄矿3号煤层的无烟煤为研究对象,运用自主研发的"含瓦斯煤热流固耦合三轴伺服渗流实验装置",进行了恒定瓦斯压力和围压条件下含瓦斯煤热流固耦合全应力-应变瓦斯渗流实验。研究结果表明:随着煤样温度的升高,煤样的三轴抗压强度降低,承受变形的能力减小,弹性模量增大;在全应力-应变整个过程中,煤样的渗透率总体呈下降趋势;煤样渗透率小不利于采煤之前的瓦斯抽放,导致煤层深处与工作面之间的瓦斯压力梯度较大,并且高温煤样在屈服阶段的渗透率增长更快,使煤与瓦斯突出的危险性增大。煤体渗透率与应力之间的关系不是单调的随应力的增大而减小,而是要看煤体处于何种应力-应变状态。Focusing on anthracites of No.3 coal seam of Zhaozhuang Mine,Jincheng Coal Mining Group,by using self-made ＂thermo-fluid-solid coupling with triaxial servo-controlled seepage equipment of containing-gas coal＂,an experimental study was carried out to investigate the gas seepage law of containing-gas coal during the complete stress-strain process with thermo-fluid-solid coupling,under the conditions of constant gas pressure and confining pressure.The research results show that：with the increase of temperature at coal,the triaxial compressive strength of coal decreases,and the ability of coal to support the deformation of coal decreases,but the elastic ratio of coal increases;the permeability of coal generally experiences a decreasing trend throughout the complete stress-strain process;the small permeability of coal is not conducive to gas drainage before mining,resulting in a large gas pressure gradient between deep coal seams and the coal face,and due to the permeability of high-temperature coal increasing faster in the yield phase,the risk of coal and gas outburst increasing.The relation between coal permeability and stress is not monotonic.The permeability of coal does not always decrease with the increasing of stress,but rather depends on which kind of stress-strain state the coal is in.

关 键 词：热-流-固耦合 全应力-应变 煤与瓦斯突出 渗透率 

分 类 号：TD712.51[矿业工程—矿井通风与安全]