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主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
不同剪切端面和围压下损伤煤体孔渗特性实验研究
  • Title

    Experimental study on porosity and permeability characteristics of damaged coal in different shear end faces and confining pressures

  • 作者

    郑春山董洋洋薛生江丙友赵洋

  • Author

    ZHENG Chunshan;DONG Yangyang;XUE Sheng;JIANG Bingyou;ZHAO Yang

  • 单位

    安徽理工大学 煤炭安全精准开采国家地方联合工程研究中心合肥综合性国家科学中心能源研究院(安徽省能源实验室)安徽理工大学 安全科学与工程学院

  • Organization
    Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining, Anhui University of Science and Technology
    Institute of Energy, Hefei Comprehensive National Science Center (Anhui Energy Laboratory)
    School of Safety Science and Engineering, Anhui University of Science and Technology
  • 摘要

    煤体损伤是影响渗透率变化和瓦斯流动的重要因素;采用多剪切端面损伤渗流测试系统和核磁共振仪,分析了不同剪切端面和围压下损伤煤体孔渗特性变化规律。结果表明:损伤煤体内中大孔增多,吸附空间向渗流空间转化,孔隙间连通性变好;50%剪切端面情况下,渗流空间(驰豫时间2>10 ms)平均面积百分比由9.89%增大为14.94%;剪切应力作用下,煤体轴向变形量不断增大,50%剪切端面比30%剪切端面导致的轴向变形量大,而围压值越大,轴向变形量越小;随着剪切应力的增大,煤体渗透率先降低后缓慢增加,当应力达到煤体强度阈值时,损伤煤体渗透率以指数形式增大,50%剪切端面对应的渗透率值普遍比30%剪切端面的大,前者是后者的7倍左右。

  • Abstract

    Coal damage is a significant factor which affects coal permeability changes and gas flow. Damage-based seepage testing system with multi-shear end faces and nuclear magnetic resonance instrument were adopted to analyze porosity and permeability characteristics of damaged coal in different shear end faces and confining pressures. It is found that the number of macro-pores in damaged coal increases. Meanwhile, adsorption space transforms into seepage space, with better connectivity between pores. In the case of 50% shear end face, average area percentage of seepage space (relaxation time2>10 ms) rises from 9.89% to 14.94%. Affected by shear stress, the axial deformation of coal continuously increases, 50% shear end face causing bigger axial deformation than the 30% shear end face. The larger the confining pressure value, the smaller the axial deformation. With increasing shear stress, permeability of coal decreases first before slowly growing. When stress reaches the threshold of coal strength, permeability of damaged coal rises exponentially. The permeability value corresponding to 50% shear face is generally larger than that of 30% shear face, and the former is about 7 times that of the latter.

  • 关键词

    瓦斯抽采损伤煤体渗透率多剪切端面孔渗特性围压瓦斯流动

  • KeyWords

    gas drainage;damaged coal permeability;multiple shear end faces;porosity and permeability characteristics;confining pressure;gas flow

  • 基金项目(Foundation)
    国家自然科学基金资助项目(52274171);煤炭安全精准开采国家地方联合工程研究中心开放基金资助项目(EC2023015);山西省揭榜招标资助项目(20201101001)
  • DOI
  • 引用格式
    郑春山,董洋洋,薛生,等. 不同剪切端面和围压下损伤煤体孔渗特性实验研究[J]. 煤矿安全,2024,55(3):1−8.
  • Citation
    ZHENG Chunshan, DONG Yangyang, XUE Sheng, et al. Experimental study on porosity and permeability characteristics of damaged coal in different shear end faces and confining pressures[J]. Safety in Coal Mines, 2024, 55(3): 1−8.
  • 相关文章
  • 图表
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    • 多剪切端面损伤渗流动态测试系统

    图(4) / 表(1)

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