低渗煤样CH_4非线性压力分布与渗透率演化  

Nonlinear Pressure Distribution of CH_4 and Permeability Evolution for Low Permeability Coal Samples

作　　者：陈超凡[1] 王睿[1] 薛东杰[1,2] 卓壮[1] 周宏伟[1,3] 

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]安徽理工大学煤矿安全高效开采省部共建教育部重点实验室,安徽淮南232001 [3]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《煤矿安全》2016年第9期169-172,共4页Safety in Coal Mines

基　　金：国家重点基础研究发展计划资助项目(2011CB201201);国家自然科学基金青年基金资助项目(51504257);煤矿安全高效开采省部共建教育部重点实验室开放基金资助项目(JYBSYS2015109)

摘　　要：为研究低渗煤岩全应力-应变过程中的渗流特性,基于COMSOL Multiphysics数值模拟软件,结合达西定律与固体力学理论对张集矿的标准煤岩试件内部气体渗透特性进行数值模拟。结果表明:甲烷气体在煤样中的非饱和渗透过程中,气体压力非线性分布现象十分明显,但随着渗透时间推进,其气体压力分布规律逐步趋于线性;围压与屈服强度存在正相关的关系,与渗透率呈负相关的关系,此外,低渗煤岩的流固耦合渗流效应更加明显。In order to study the seepage characteristics of low permeability coal samples in the process of whole stress - strain, in this paper, the experimental results come from the whole stress -strain process seepage test of low permeability coal sample, which are taken from Zhangji Coal Mine. Furthermore, combining with Darcy~ law and the theory of solid mechanics, the numerical simulation of internal gas permeation properties of specimen is conducted based on the experimental results by using COMSOL Multiphysics. The nu- merical simulation results show that the methane gas in the process of unsaturated seepage in the coal sample, gas pressure distribution of nonlinear phenomenon is obvious. But as the infiltration time ahead, the gas pressure distribution law gradually tends to be linear. Confining pressure and the yield strength is positively related to relationship, and negatively correlated with permeability. Whatg more, fluid - solid coupling seepage effect of low permeability coal is more obvious.

关 键 词：低渗煤样 COMSOL MULTIPHYSICS 全应力-应变 耦合渗流 非线性压力分布 渗透率演化 

分 类 号：TD712[矿业工程—矿井通风与安全]