›› 2018, Vol. 39 ›› Issue (2): 635-643.doi: 10.16285/j.rsm.2016.0313

• 基础理论与实验研究 • 上一篇    下一篇

基于不同方向模量损失率的含瓦斯煤各向异性渗透模型

亓宪寅1, 2,李家卓2, 3,王 威4   

  1. 1. 长江大学 岩土力学与工程研究中心,湖北 荆州 434023; 2. 安徽理工大学 省部共建深部煤矿采动响应与灾害防控国家重点实验室(筹),安徽 淮南,232001; 3. 安徽理工大学 能源与安全学院,安徽 淮南,232001;4. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点试验室,湖北 武汉 430071
  • 收稿日期:2016-04-25 出版日期:2018-02-10 发布日期:2018-06-06
  • 通讯作者: 李家卓,男,1986年生,博士研究生,主要从事岩体多场耦合方面的研究。E-mail: 592859929@qq.com E-mail:qixianyin001@163.com
  • 作者简介:亓宪寅,男,1986年生,博士研究生,主要从事煤层气试验和数值仿真方面的研究。
  • 基金资助:

    国家重点研发计划(No. 2017YFC0804202);深部煤矿采动响应与灾害防控安徽省重点实验室开放基金(No. KLDCMERDPC17105)。

An anisotropic permeability model of coal containing methane based on different directional modulus reduction ratios

QI Xian-yin1, 2, LI Jia-zhuo2, 3, WANG Wei4   

  1. 1. Research Center of Geomechanics and Geotechnical Engineering, Yangtze University, Jingzhou, Hubei 434023, China; 2. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine, Anhui University of Science and Technology, Huainan, Anhui 232001, China; 3. School of Mining and Safety Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, China; 4. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
  • Received:2016-04-25 Online:2018-02-10 Published:2018-06-06
  • Supported by:

    This work was supported by the National Key Research and Development Program of China (2017YFC0804202) and the Open Foundation of Key Laboratory of Deep Coal Mine Excavation Response &Disaster Prevention and Control, Anhui Province ( KLDCMERDPC17105) .

摘要: 煤是自然界中一种常见的沉积岩,它具有显著的各向异性特征。然而目前针对煤体渗透特性研究,多数学者为了简化问题,多假设煤体为各向同性材料,提出了相应的各向同性渗透模型。这类模型并不能完全反映含瓦斯煤气-固耦合真实工程和室内试验的实际情况。假设煤体为横观各向同性,推导出以不同方向模量损失率为关键参数的煤体各向异性渗透模型,在此基础上,推导出含瓦斯煤的气-固耦合控制方程,并植入Comsol计算平台,系统研究煤体各向异性对气体扩散和渗透的影响。理论和数值研究结果表明:不同方向的模量损失率 反映出煤体结构各向异性变化程度,若 不同,其煤体各方向渗透特性也不相同;煤体渗透率的改变主要受解吸附效应和有效应力作用双重影响, 反映了这两种效应对于渗透率的影响程度;单轴应变或位移控制边界条件下,水平方向的模量损失率 对于垂直方向的煤体渗透率改变量 的影响程度大于对水平方向的煤体渗透率改变量 的影响程度,垂直方向模量损失率 对 的影响则弱于对于 的影响。

关键词: 含瓦斯煤, 弹性模量损失率, 解吸附效应, 渗透模型, 各向异性, 气-固耦合

Abstract: Coal, as a typical sedimentary rock, has a naturally anisotropic feature. For simplicity, coal is considered as an isotropic material in the study of coal permeability, and the corresponding isotropic permeability models have been proposed. However, the actual situation of gas-solid coupling in the field and laboratory tests cannot be well reflected by these models. In this paper, coal is treated as transversely isotropic, and an anisotropic permeability model is developed by using different directional modulus reduction ratios as the key parameters. The developed model is further implemented in COMSOL multiphysics software to comprehensively investigate the effect of coal anisotropy on gas diffusion and penetration. Theoretical and numerical results show that different directional modulus reduction ratios ( ) reflect the degree of anisotropy of the coal structure. When is different, the coal permeability is also not the same. Coal permeability is mainly governed by mechanical effects and desorption effects, and meanwhile, these two effects on each direction of the permeability of coal are controlled by boundary conditions. is a reflection of these two effects. Under the uniaxial strain or displacement control boundary condition, the horizontal modulus reduction ratio ( ) has more significant effect on the amount of permeability change in the vertical direction ( ) than on that in the horizontal direction ( ). However, the vertical modulus reduction ratio ( ) has less effect on than on .

Key words: coal containing methane, elastic modulus reduction ratio, desorption effects, permeability model, anisotropic, gas-solid coupling

中图分类号: 

  • O 319.56

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