热应力作用下有效应力对原煤渗透特性的影响  

Influence of Effective Stress on Seepage Characteristics of Coal Under Thermal Stress

作　　者：段守德 赵宏刚[2,3] 李彦志[1] 

机构地区：[1]中国平煤神马集团八矿,河南平顶山467000 [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：《煤矿安全》2018年第1期29-32,共4页Safety in Coal Mines

基　　金：重庆市研究生科研创新资助项目(CYS16012)

摘　　要：利用重庆大学自行研制的煤岩热流固耦合实验系统(THM-2),进行不同应力阶段、不同瓦斯压力和不同温度条件下的三轴加载渗流试验,探讨基于热应力作用下的有效应力对煤岩渗透率的影响。结果表明:3种应力阶段下,煤岩渗透率均随着温度的升高逐渐降低,但温度升高,渗透率的减小速率则逐渐降低;围压和轴压对煤岩的裂隙发展起到抑制阻碍作用,从而使渗透率的减小速率逐渐降低;基于热应力作用下的渗透率与有效应力关系表达式计算结果与试验结果吻合较好,可以很好的反映煤样渗透率。In order to investigate the influence of effective stress on permeability of the coal based on thermal stress,seepage tests of triaxial loading under different stress states,different gas pressure and different temperature conditions were carried out by the self-made ＂thermo-fluid-solid coupling with triaxial-servo controlled seepage equipment system of coal and rock＂.The results show that：under three kinds of stress states,the coal permeability decreased with the increasing of temperature.But the decreasing rate of permeability reduced gradually with the increasing of temperature;the crack growth of coal and rock was inhibited by the confining pressure and axial pressure,so that the rate of permeability decreased gradually;according to the relationship between permeability and effective stress under the thermal stress,the calculation results are in good agreement with the experimental results,which can well reflect the permeability of coal samples.

关 键 词：渗透率 温度 热应力 有效应力 瓦斯压力 原煤渗透特性 

分 类 号：TD713[矿业工程—矿井通风与安全]