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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
  • [1] 张庆华,宁小亮,宋志强,等. 瓦斯灾害区域安全态势预警技术[J]. 工矿自动化,2020,46(7):42-48. doi: 10.13272/j.issn.1671-251x.17632

    ZHANG Qinghua,NING Xiaoliang,SONG Zhiqiang,et al. Early warning technology of regional security situation of gas disasters[J]. Industry and Mine Automation,2020,46(7):42-48. doi: 10.13272/j.issn.1671-251x.17632
    [2] 张钧祥,刘彦伟,任培良,等. 基于蠕变效应的穿层钻孔封孔参数优化与试验研究[J]. 中国安全科学学报,2021,31(7):97-104.

    ZHANG Junxiang,LIU Yanwei,REN Peiliang,et al. Optimization and experimental study of sealing parameters of crossing boreholes based on creep effect[J]. China Safety Science Journal,2021,31(7):97-104.
    [3] 陈同庆,沈荣喜,李红儒,等. 自然和饱水煤样巴西劈裂过程声发射幅频特征试验[J]. 工矿自动化,2019,45(12):40-44,49.

    CHEN Tongqing,SHEN Rongxi,LI Hongru,et al. Experiment of amplitude and frequency feature of acoustic emission during Brazilian splitting testing of natural and saturated coal samples[J]. Industry and Mine Automation,2019,45(12):40-44,49.
    [4] 来兴平,张帅,崔峰,等. 含水承载煤岩损伤演化过程能量释放规律及关键孕灾声发射信号拾取[J]. 岩石力学与工程学报,2020,39(3):433-444.

    LAI Xingping,ZHANG Shuai,CUI Feng,et al. Energy release law during the damage evolution of water-bearing coal and rock and pick-up of AE signals of key pregnancy disasters[J]. Chinese Journal of Rock Mechanics and Engineering,2020,39(3):433-444.
    [5] 王凯,蒋一峰,徐超. 不同含水率煤体单轴压缩力学特性及损伤统计模型研究[J]. 岩石力学与工程学报,2018,37(5):1070-1079.

    WANG Kai,JIANG Yifeng,XU Chao. Mechanical properties and statistical damage model of coal with different moisture contents under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering,2018,37(5):1070-1079.
    [6] 陈春谏,赵耀江,郭胜亮,等. 不同含水率煤岩声发射特性试验研究[J]. 煤矿安全,2018,49(5):40-42,46. doi: 10.13347/j.cnki.mkaq.2018.05.010

    CHEN Chunjian,ZHAO Yaojiang,GUO Shengliang,et al. Experimental study on acoustic emission characteristics of coal with different moisture content[J]. Safety in Coal Mines,2018,49(5):40-42,46. doi: 10.13347/j.cnki.mkaq.2018.05.010
    [7] 秦虎,黄滚,王维忠. 不同含水率煤岩受压变形破坏全过程声发射特征试验研究[J]. 岩石力学与工程学报,2012,31(6):1115-1120. doi: 10.3969/j.issn.1000-6915.2012.06.004

    QIN Hu,HUANG Gun,WANG Weizhong. Experimental study of acoustic emission characteristics of coal samples with different moisture contents in process of compression deformation and failure[J]. Chinese Journal of Rock Mechanics and Engineering,2012,31(6):1115-1120. doi: 10.3969/j.issn.1000-6915.2012.06.004
    [8] WANG Shen,LI Huamin,WANG Wen,et al. Experimental study on mechanical behavior and energy dissipation of anthracite coal in natural and forced water-saturation states under triaxial loading[J]. Arabian Journal of Geosciences,2018,11(21):668-685. doi: 10.1007/s12517-018-4014-4
    [9] 李波波,王忠晖,任崇鸿,等. 水−力耦合下煤岩力学特性及损伤本构模型研究[J]. 岩土力学,2021,42(2):315-323,332.

    LI Bobo,WANG Zhonghui,REN Chonghong,et al. Mechanical properties and damage constitutive model of coal under the coupled hydro-mechanical effect[J]. Rock and Soil Mechanics,2021,42(2):315-323,332.
    [10] 王文,张世威,LIU Kai,等. 真三轴动静组合加载饱水煤样动态强度特征研究[J]. 岩石力学与工程学报,2019,38(10):2010-2020. doi: 10.13722/j.cnki.jrme.2019.0227

    WANG Wen,ZHANG Shiwei,LIU Kai,et al. Experimental study on dynamic strength characteristics of water-saturated coal under true triaxial static-dynamic combination loadings[J]. Chinese Journal of Rock Mechanics and Engineering,2019,38(10):2010-2020. doi: 10.13722/j.cnki.jrme.2019.0227
    [11] 冯国瑞,文晓泽,郭军,等. 含水率对煤样声发射特征和碎块分布特征影响的试验研究[J]. 中南大学学报(自然科学版),2021,52(8):2910-2918.

    FENG Guorui,WEN Xiaoze,GUO Jun,et al. Study on influence of moisture content on coal sample AE properties and fragment distribution characteristics[J]. Journal of Central South University(Science and Technology),2021,52(8):2910-2918.
    [12] 李高阳. 水对煤岩声发射特性影响的试验研究[J]. 教育教学论坛,2019(41):128-129.

    LI Gaoyang. Experimental study on the effect of water on acoustic emission characteristics of coal and rock[J]. Education Teaching Forum,2019(41):128-129.
    [13] CHEN Tian,YAO Qiangling,WEI Fei,et al. Effects of water intrusion and loading rate on mechanical properties of and crack propagation in coal-rock combinations[J]. Journal of Central South University,2017,24(2):423-431. doi: 10.1007/s11771-017-3444-6
    [14] 朱权洁,张尔辉,李青松,等. 岩石破坏失稳的声发射响应与损伤定量表征研究[J]. 中国安全生产科学技术,2020,16(1):92-98.

    ZHU Quanjie,ZHANG Erhui,LI Qingsong,et al. Study on acoustic emission response and damage quantitative characterization of rock destruction and instability[J]. Journal of Safety Science and Technology,2020,16(1):92-98.
    [15] 陈海栋,陈蒙磊,肖知国,等. 外加水分对软硬煤瓦斯解吸特征影响研究[J]. 工矿自动化,2020,46(11):28-33,40.

    CHEN Haidong,CHEN Menglei,XIAO Zhiguo,et al. Research on influence of external moisture on gas desorption characteristics of soft and hard coal[J]. Industry and Mine Automation,2020,46(11):28-33,40.
    [16] 梁乐,王志亮. 不同加载条件下陕西华山花岗岩破坏过程的声发射特性[J]. 水文地质工程地质,2014,41(2):85-90.

    LIANG Le,WANG Zhiliang. Acoustic emission characteristics of the granite in Huashan,Shaanxi during the failure process under different loading conditions[J]. Hydrogeology & Engineering Geology,2014,41(2):85-90.
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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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