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加卸载煤体损伤-渗透特性影响因素实验研究

徐超 秦亮亮 李晓敏 杨港 孙浩石

徐超, 秦亮亮, 李晓敏, 杨港, 孙浩石. 加卸载煤体损伤-渗透特性影响因素实验研究[J]. 矿业科学学报, 2021, 6(3): 280-289. doi: 10.19606/j.cnki.jmst.2021.03.004
引用本文: 徐超, 秦亮亮, 李晓敏, 杨港, 孙浩石. 加卸载煤体损伤-渗透特性影响因素实验研究[J]. 矿业科学学报, 2021, 6(3): 280-289. doi: 10.19606/j.cnki.jmst.2021.03.004
Xu Chao, Qin Liangliang, Li Xiaomin, Yang Gang, Sun Haoshi. Experimental study on influence factors in damage-permeability characteristics of loading and unloading coal[J]. Journal of Mining Science and Technology, 2021, 6(3): 280-289. doi: 10.19606/j.cnki.jmst.2021.03.004
Citation: Xu Chao, Qin Liangliang, Li Xiaomin, Yang Gang, Sun Haoshi. Experimental study on influence factors in damage-permeability characteristics of loading and unloading coal[J]. Journal of Mining Science and Technology, 2021, 6(3): 280-289. doi: 10.19606/j.cnki.jmst.2021.03.004

加卸载煤体损伤-渗透特性影响因素实验研究

doi: 10.19606/j.cnki.jmst.2021.03.004
基金项目: 

国家自然科学基金 51974321

国家自然科学基金 51874314

国家自然科学基金 51774292

详细信息
    作者简介:

    徐超(1988—),男,山东泰安人,副教授,工学博士,主要从事瓦斯动力灾害、煤层气安全高效开采等方面的研究工作。Tel: 18811397939,E-mail: xuchao@cumtb.edu.cn

  • 中图分类号: TD712

Experimental study on influence factors in damage-permeability characteristics of loading and unloading coal

  • 摘要: 深部煤层开采过程中,多重因素影响着煤体损伤-渗透特性。为揭示采动煤体损伤-渗透特性演化规律,开展了不同工程条件代表的恒围压加轴压(路径1)、恒轴压卸围压(路径2)和同时加轴压卸围压(路径3)3种力学路径下煤体损伤-渗透实验,分析加卸载方式、轴压加载速率、围压卸荷速率以及围压等因素对型煤煤体损伤-渗透特性的影响规律。结果表明,不同加卸载方式显著影响着试样损伤程度,按严重程度排序依次是:路径1<路径2<路径3;试样的抗压强度随加卸载速率的增高而较快达到,损伤程度和渗透率增幅却随之增高;随着围压的增高,损伤的时间响应变慢,渗透率最终恢复程度降低,煤体的损伤、渗透特性具有显著的围压效应。能量累计量随时间的变化呈指数函数关系,损伤扩容后相对渗透率k/k0呈幂函数关系。
  • 图  1  实验系统原理

    Figure  1.  Principle of experimental system

    图  2  加卸载方式对煤体损伤-渗透特性影响规律

    Figure  2.  Influence of loading and unloading modes on coal damage-permeability characteristics

    图  3  加载速率对煤体损伤-渗透特性影响规律

    Figure  3.  Influence of loading rate on coal damage-permeability characteristics

    图  4  卸荷速率对煤体损伤-渗透特性影响规律

    Figure  4.  Influence of unloading rate on coal damage-permeability characteristic

    图  5  围压对煤体损伤-渗透特性影响规律

    Figure  5.  Influence of confining pressure on coal damage-permeability characteristics

    图  6  煤层开采过程中采动煤岩体应力状态

    Figure  6.  Stress state of coal and rock mass during coal mining

    表  1  实验参数

    Table  1.   Experimental program parameters

    力学路径编号瓦斯压力/MPa初始围压/MPa初始轴压/MPa围压卸荷速率/(N·s-1)轴压加载速率/(N·s-1)
    恒围压加轴压
    (路径1)
    1-113--80
    1-215--40
    1-315--80
    1-415--120
    1-517--80
    恒轴压卸围压
    (路径2)
    2-11712.510-
    2-21712.515-
    2-31712.520-
    2-417510-
    同时加轴压卸围压
    (路径3)
    3-11751040
    3-21751080
    3-317510120
    3-41751580
    3-51752080
    下载: 导出CSV

    表  2  不同卸载条件下AE信号、渗透率与时间的关系

    Table  2.   The relationship between AE, permeability and time under loading-unloading conditions

    实验
    编号
    扩容点时刻t0/s能量累计量E /104 aJ相对渗透率k/k0
    拟合公式拟合系数拟合公式拟合系数
    1-1383E=0.0035e0.0127(t-t0)0.733 9k/k0=0.18(t-t0)0.26130.770 6
    1-2626E=0.061e0.0017(t-t0)0.941 9k/k0=0.539(t-t0)0.06640.850 3
    1-3471E=0.0397e0.0061(t-t0)0.775 9k/k0=0.5096(t-t0)0.07770.820 8
    1-4507E=0.0224e0.0103(t-t0)0.879 6k/k0=0.6303(t-t0)0.0440.998 3
    1-5838E=0.0621e0.0017(t-t0)0.978 6k/k0=0.4996(t-t0)0.07370.967 5
    2-1586E=0.581e0.0032(t-t0)0.905 0k/k0=0.0937(t-t0)0.42140.965 3
    2-2639E=4.6135e0.0051(t-t0)0.921 6k/k0=0.1033(t-t0)0.43530.993 9
    2-3655E=4.8007e0.0068(t-t0)0.927 1k/k0=0.0737(t-t0)0.54180.995 7
    2-4575E=0.0683e0.0051(t-t0)0.923 6k/k0=0.1272(t-t0)0.38920.956 6
    3-1326E=0.0774e0.0057(t-t0)0.700 7k/k0=0.0892(t-t0)0.50350.979 5
    3-2239E=0.0593e0.0091(t-t0)0.974 4k/k0=0.1162(t-t0)0.40390.983 2
    3-3189E=0.0389e0.0153(t-t0)0.964 5k/k0=0.1243(t-t0)0.43590.968 5
    3-4233E=0.0201e0.01(t-t0)0.979 4k/k0=0.1076(t-t0)0.42290.809 5
    3-5244E=0.0345e0.006(t-t0)0.977 1k/k0=0.143(t-t0)0.45620.889 3
    下载: 导出CSV
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  • 收稿日期:  2020-11-15
  • 修回日期:  2021-01-09
  • 刊出日期:  2021-06-01

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