应力加卸载下层理裂隙煤体瓦斯渗流试验研究  

Experimental study on seepage of gas from fractured coal under stress loading and unloading conditions

作　　者：田坤云[1] 齐雷[2] TIAN Kunyun QI Lei(School of Safety Science ＆ Engineering, Henan University of Engineering, Zhengzhou Henan 451191 ,China Department of Architectural Engineering, Zhengzhou Shengda University of Economics, Business ＆ Management, Zhengzhou Henan 451191, China)

机构地区：[1]河南工程学院安全工程学院 [2]郑州升达经贸管理学院建筑工程系

出　　处：《中国安全科学学报》2017年第1期93-97,共5页China Safety Science Journal

基　　金：国家自然科学基金资助(51604091);河南工程学院博士基金项目资助(D2015025)

摘　　要：为探讨同一应力加卸载作用下不同层理方向裂隙煤体的瓦斯(甲烷)渗透规律,采用自行设计、改装的三轴应力瓦斯渗透模拟装置,在相同瓦斯压力条件下,对平行及垂直层理方向的2种原煤样试件进行试验研究。结果表明,加载过程中,2种试件的渗透率均随有效应力的增大而减小,应力加载至最大值时,渗透率分别下降了99.01%和80.49%;卸载过程中,渗透率随有效应力的减小而增大,卸载初期渗透率变化较小。有效应力从11.65 MPa卸载至8.98 MPa时,渗透率分别恢复到最大应力加载值的87.45%、68.8.5%。当卸载至4.98 MPa时,渗透率的增加幅度分别为736.78%和99.67%。相同的卸载条件下,平行层理裂隙试件的渗透率增幅比垂直层理裂隙试件大得多。In order to explore the seepage laws of gas（ methane） from different bedding direction fractured coal samples under the same stress loading and unloading condition,experiments were carried out on the parallel and vertical bedding direction raw coal samples employing a self designed and modified three stress axis gas penetration simulation experiment device. The results showed that in the stress loading process,both the permeability values of the two coal samples decreased with the increase of effective stress,the values decrease by 99.01% and 80.49% respectively when the effective stress was loaded to the maximum value. In the stress unloading process,the values increased with the decrease of effective stress and the change was small at the beginning of unloading,the values recovered to 87.45% and 68.8.5% of the minimum values respectively when the effective stress unloaded from 11. 65 to 8. 98 MPa,that the increased amplitude of the values are 736. 78% and 99. 67% when the effective stress unloaded to4.98 MPa,and that the increase amplitude of the value of parallel bedding direction coal sample was much bigger under the same unloading condition.

关 键 词：加卸载 裂隙煤体 渗透特性 原煤样 钻孔布置 

分 类 号：X936[环境科学与工程—安全科学]