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单轴压缩条件下不同含水率煤体裂纹扩展及破坏模式研究

卢卫永 刘琦 屈丽娜 张海军

卢卫永,刘琦,屈丽娜,等. 单轴压缩条件下不同含水率煤体裂纹扩展及破坏模式研究[J]. 工矿自动化,2022,48(8):85-91.  doi: 10.13272/j.issn.1671-251x.2022040036
引用本文: 卢卫永,刘琦,屈丽娜,等. 单轴压缩条件下不同含水率煤体裂纹扩展及破坏模式研究[J]. 工矿自动化,2022,48(8):85-91.  doi: 10.13272/j.issn.1671-251x.2022040036
LU Weiyong, LIU Qi, QU Lina, et al. Study on coal crack propagation and failure mode with different moisture content under uniaxial compression[J]. Journal of Mine Automation,2022,48(8):85-91.  doi: 10.13272/j.issn.1671-251x.2022040036
Citation: LU Weiyong, LIU Qi, QU Lina, et al. Study on coal crack propagation and failure mode with different moisture content under uniaxial compression[J]. Journal of Mine Automation,2022,48(8):85-91.  doi: 10.13272/j.issn.1671-251x.2022040036

单轴压缩条件下不同含水率煤体裂纹扩展及破坏模式研究

doi: 10.13272/j.issn.1671-251x.2022040036
基金项目: 山西省基础研究计划资助项目(20210302124633);吕梁市平台基地建设项目(2021GCZX-1-46);国家自然科学基金项目(51804355)。
详细信息
    作者简介:

    卢卫永(1987—),男,河南沈丘人,副教授,博士,主要研究方向为煤岩体水力致裂,E-mail:luwyll@126.com

    通讯作者:

    刘琦(1972—),男,河南郑州人,副教授,博士,主要研究方向为矿山安全与灾害防治,E-mail:liuqzut@126.com

  • 中图分类号: TD712

Study on coal crack propagation and failure mode with different moisture content under uniaxial compression

  • 摘要: 为研究水分侵入对受载煤体裂纹扩展及破坏模式的影响,开展了不同含水率煤体单轴压缩试验及声发射监测,对比分析了不同含水率下受载煤体应力−应变特征、宏观破坏形态及累计振铃计数的变化规律。单轴压缩试验结果表明,随着含水率增加,煤体单轴抗压强度及弹性模量持续降低,且峰后阶段内煤体应力下降速率逐渐平缓,煤样宏观破裂模式由典型的脆性破坏转变为剪切−拉张组合破坏。声发射监测结果表明,随着煤体含水率增加,累计振铃计数不断降低,而累计振铃计数曲线斜率相应增大,说明水分侵入会降低煤体裂隙发育时的能量释放,但加剧了煤体内部结构损伤。研究结果表明,水分的侵入一定程度上削弱了裂隙表面晶体颗粒间的相互摩擦,增加了煤体滑移破坏的可能性;同时水分侵入也减小了煤体表面活性能,导致煤样受载过程中产生的裂隙数量显著增多,造成煤体宏观力学强度大幅降低。

     

  • 图  1  试验方案

    Figure  1.  Experimental scheme

    图  2  煤样含水率变化曲线

    Figure  2.  Change curves of coal samples moisture content

    图  3  不同含水率煤样应力−应变曲线

    Figure  3.  Stress-strain curves of coal samples with different moisture content

    图  4  不同含水率煤样破坏模式

    Figure  4.  Failure modes of coal samples with different moisture content

    图  5  不同含水率煤样应力和累计振铃计数随时间变化曲线

    Figure  5.  Change curve with the time of stress and cumulative ring count of coal samples with different moisture content

    图  6  不同含水率煤样累计振铃计数对比曲线

    Figure  6.  Comparison curves of cumulative ringing counts of coal samples with different moisture content

    表  1  煤样基本力学参数

    Table  1.   Basic mechanics parameters of coal samples

    参数
    真密度/(kg·m−31 365
    抗压强度/MPa20.75
    抗拉强度/MPa2.61
    黏聚力/MPa4.07
    内摩擦角/(°)27.64
    弹性模量/GPa1.82
    泊松比0.31
    下载: 导出CSV

    表  2  不同含水率煤样单轴压缩试验结果

    Table  2.   Uniaxial compression test results of coal samples with different moisture content

    煤样
    编号
    含水
    率/%
    密度/
    (kg·m−3
    抗压
    强度/MPa
    应变/%弹性
    模量/GPa
    A−101 379.1820.721.361.85
    A−201 371.8921.371.431.81
    A−301 344.3420.161.331.79
    B−16.831 521.9718.581.431.70
    B−26.541 485.7419.041.391.79
    B−36.981 498.8018.331.441.68
    C−19.611 578.1714.431.471.53
    C−210.031 468.7915.741.501.67
    C−39.841 527.3616.841.521.73
    D−110.891 481.9012.591.511.24
    D−211.081 531.4114.931.611.39
    D−311.111 564.9713.971.521.37
    下载: 导出CSV
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  • 收稿日期:  2022-04-13
  • 修回日期:  2022-08-06
  • 网络出版日期:  2022-08-09

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