卸荷条件下含瓦斯煤力学特性试验研究  

EXPERIMENTAL STUDY OF MECHANICAL PROPERTIES OF COAL CONTAINING GAS UNDER UNLOADING CONDITIONS

作　　者：徐佑林[1,2] 康红普[1,2] 张辉[1,2] 王维忠[3] 

机构地区：[1]天地科技股份有限公司开采设计事业部,北京100013 [2]煤炭科学研究总院开采设计研究分院,北京100013 [3]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400030

出　　处：《岩石力学与工程学报》2014年第A02期3476-3488,共13页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金委与神华集团有限公司联合资助项目(U1261211)

摘　　要：为分析煤矿井下瓦斯压力、地应力、开采强度及其耦合条件对含瓦斯煤力学特性及巷道围岩变形破坏规律的影响,采用含瓦斯煤热流固三轴伺服试验系统进行不同瓦斯压力、围压和卸围压速率组合条件下的卸围压试验。研究结果表明:(1)瓦斯压力对煤体弹性模量影响显著,煤体弹性模量随瓦斯压力的增加而减小;(2)围压对煤体弹性模量影响显著,煤体弹性模量随围压增加而增加;(3)卸围压速率对煤体弹性模量影响显著,煤体弹性模量随卸围压速率的增加而减小;(4)含瓦斯煤体发生变形破坏所需时间随瓦斯压力增加而减少、随围压增加而增加、随卸围压速率增加而减少。Based on the triaxial stress thermal-hydro-mechanical coal containing gas system,unloading confining pressure experiments under different gas pressures and confining pressuresand speeds of unloading confining pressures,are carried out to study the influences of gas pressure,stress,speed of unloading confining pressure and their coupling conditions on the mechanical properties and the laws of roadway surrounding rock deformation and failure. The results show that：（1） The gas pressure has an obvious infulence on the coal elasticity modulus. The elasticity modulus decreases with the increase of gas pressure.（2） The confining pressure has an obvious infulence on the coal elasticity modulus. The elasticity modulus increases with the increase of confining pressure.（3） The speed of unloading confining pressure has an obvious infulence on the coal elasticity modulus. The elasticity modulus decreases with the increase of the speed of unloading confining pressure.（4） The time before deformation and failure increases with increase of confining pressure,decrease of gas pressure and the increase of speed of unloading confining pressure.

关 键 词：采矿工程 含瓦斯煤 卸围压 力学特性 试验研究 

分 类 号：TD32[矿业工程—矿井建设]