多场耦合下煤岩渗透率演化规律——以平煤十矿为例  

Evolution of coal rock permeability with multiphysics coupling——taking Ping Mei No.10 mine as an example

作　　者：张景飞[1,2] 郭倩 朱同功 王飞 ZHANG Jing-fei;GUO Qian;ZHU Tong-gong;WANG Fei(College of Resources and Safety Engineering,China University of Mining&Technology,Beijing,Beijing 100083,China;School of Mechanics and Engineering Science,Zhengzhou University,Zhengzhou 450001,China;China PingMeiShenMa Group,Pingdingshan 467000,China)

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083 [2]郑州大学力学与工程科学学院,河南郑州450001 [3]中国平煤神马能源化工集团有限责任公司,河南平顶山467000

出　　处：《西安科技大学学报》2018年第5期713-720,共8页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金(41172144);教育部科学研究重大项目(311022);河南省高等学校重点科研项目(18A620003)

摘　　要：为深入探讨多场耦合下的煤岩渗透率演化规律,文中以平煤十矿己15-16煤为研究对象,进行了不同围压、气体压力和温度条件下的型煤渗透率测定实验研究。结果表明:围压决定煤岩内部的有效应力,围压增加促使煤体被压缩,渗流和扩散通道变窄,导致煤岩渗透率降低;气体压力升高促使煤体对气体的吸附量增加,导致吸附于孔裂隙壁的气体分子增加,进而降低了孔裂隙截面积,同时煤基质吸附大量气体产生膨胀变形,从而导致煤岩渗透率的降低;温度的升高引起气体分子渗透和扩散能力的改变,同时也导致煤基质的膨胀变形,两者耦合作用促使煤岩渗透率随温度升高先增加后降低,即在20~40℃时,温度升高促使煤岩渗透率增加,而40~100℃时,温度升高促使煤岩渗透率整体上逐渐降低,但在围压较低时煤岩渗透率具有一定的波动。In order to further explore the evolution law of permeability of coal rock with multiphysics coupling,coal permeability experiment under different confining pressure,gas pressure and temperature was carried out in this paper.Experimental results show:Firstly,the confining pressure controls the effective stress inside the coal rock,so the increase of confining pressure causes the coal to be compressed,then the seepage and diffusion channels become narrower,resulting in a decrease in the permeability of the coal rock.The increase in gas pressure causes increasing amount of gas adsorbed in coal.A large number of gas molecules adsorbed on the pore surface reduces the cross-sectional area of the pores.At the same time,the coal matrix adsorbs a large amount of gas to cause expansion deformation,resulting that the permeability of coal is reduced.The increase in temperature causes a change in the permeability of gas molecules and the expansion of the coal matrix.The coupling of the two causes the coal rock permeability to increase first and then decrease with increasing temperature,that is,at 20 to 40℃,the increase in temperature promotes the permeability of the coal to increase,whereas at 40 to 100℃,the increase in temperature causes the permeability of the coal to decrease as a whole,while the permeability of coal has a certain fluctuation at a low confining pressure.

关 键 词：安全科学与工程 围压 气压 温度 渗透率 

分 类 号：X936[环境科学与工程—安全科学]