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煤样单轴压缩破坏过程能量耗散与应力降关系研究

娄全 万祥云 贾炳 邱黎明 宋雨萱 彭德盛

娄全,万祥云,贾炳,等. 煤样单轴压缩破坏过程能量耗散与应力降关系研究[J]. 工矿自动化,2022,48(5):72-78.  doi: 10.13272/j.issn.1671-251x.2021110004
引用本文: 娄全,万祥云,贾炳,等. 煤样单轴压缩破坏过程能量耗散与应力降关系研究[J]. 工矿自动化,2022,48(5):72-78.  doi: 10.13272/j.issn.1671-251x.2021110004
LOU Quan, WAN Xiangyun, JIA Bing, et al. Research on the relationship between energy dissipation and stress drop in uniaxial compression failure of coal samples[J]. Journal of Mine Automation,2022,48(5):72-78.  doi: 10.13272/j.issn.1671-251x.2021110004
Citation: LOU Quan, WAN Xiangyun, JIA Bing, et al. Research on the relationship between energy dissipation and stress drop in uniaxial compression failure of coal samples[J]. Journal of Mine Automation,2022,48(5):72-78.  doi: 10.13272/j.issn.1671-251x.2021110004

煤样单轴压缩破坏过程能量耗散与应力降关系研究

doi: 10.13272/j.issn.1671-251x.2021110004
基金项目: 河南省高等学校重点科研项目计划项目(21A620001,20A620002);河南省重点研发与推广专项(科技攻关)项目(222102320279);河南省住房城乡建设科技计划项目(K-2115);河南省青年科学基金项目(212300410105)。
详细信息
    作者简介:

    娄全(1990—),男,河南平顶山人,讲师,博士研究生,主要研究方向为煤岩动力灾害监测预警,E-mail:louquan0501@163.com

  • 中图分类号: TD315

Research on the relationship between energy dissipation and stress drop in uniaxial compression failure of coal samples

  • 摘要: 相较于煤岩破坏能量耗散,更为直观的应力降对辅助研究煤岩破坏特征及地球物理信号变化规律具有一定的现实意义,应力降是能量耗散的宏观表现形式。目前对能量耗散和应力降的研究大多只是针对单方面的研究,未对两者之间的关系开展全面研究,两者之间的关系不明确,制约了应力降指标的应用。针对上述问题,采用YAW−600型微机控制电液伺服压力试验机对煤样进行单轴压缩实验,研究分析了煤样受载破坏全过程能量耗散指标和应力降指标的演化特征及两者之间的关系;基于理论分析,进一步研究了能量耗散指标与应力水平和应力降指标乘积的关系。研究结果表明:煤样单轴压缩破坏过程中能量耗散指标与应力降指标对煤样显著断裂都有较好的响应,且在数值上处于同一数量级,但两者不完全成比例;能量耗散速率与应力水平和应力降速率乘积呈线性关系,能量耗散量与应力水平和应力降乘积呈线性关系,拟合优度分别为1和0.997 5;相较于能量耗散指标,更为直观的应力水平和应力降指标乘积对煤样显著破坏更为敏感,且呈阵发特性。该研究结果明确了能量耗散与应力降的关系,为应力降指标的应用提供了一定的理论支撑,可用于深入研究煤岩破坏特征及声发射、电磁辐射、红外辐射等地球物理信号变化规律。

     

  • 图  1  YAW−600型压力试验机

    Figure  1.  YAW−600 pressure testing machine

    图  2  煤样受载破坏应力曲线

    Figure  2.  Stress curve of coal sample under load

    图  3  能量耗散速率和应力降速率随时间变化情况

    Figure  3.  Variation of energy dissipation rate and stress drop rate with time

    图  5  累计能量耗散量和累计应力降随时间变化情况

    Figure  5.  Variation of cumulative energy dissipation and cumulative stress drop with time

    图  4  能量耗散量和应力降随时间变化情况

    Figure  4.  Variation of energy dissipation and stress drop with time

    图  6  式(11)第1项在能量耗散中的占比随能量耗散速率的变化情况

    Figure  6.  Variation of the proportion of the first term in equation 11 in energy dissipation with energy dissipation rate

    图  7  能量耗散速率与应力降速率的关系

    Figure  7.  Relationship between energy dissipation rate and stress drop rate

    图  8  能量耗散量与应力降的关系

    Figure  8.  Relationship between energy dissipation and stress drop

    图  9  能量耗散速率与σt/σp和应力降速率乘积的关系

    Figure  9.  Relationship between energy dissipation rate and product of σt/σp and stress drop rate

    图  10  能量耗散量与σt/σp和应力降乘积的关系

    Figure  10.  Relationship between energy dissipation and product of σt/σp and stress drop

    表  1  能量耗散与应力降指标线性拟合结果

    Table  1.   Linear fitting results of energy dissipation and stress drop index

    试样编号能量耗散速率与应力降速率能量耗散量与
    应力降
    拟合优度斜率拟合优度斜率
    G1 0.996 8 0.935 2 0.978 7 0.974 4
    G2 0.958 7 1.298 0 0.829 9 0.734 1
    G3 0.961 3 1.721 4 0.773 5 1.719 4
    G4 0.996 7 1.628 2 0.998 6 2.322 4
    G5 0.998 9 1.395 7 0.982 2 1.476 1
    平均值 0.982 5 1.395 7 0.912 6 1.445 3
    下载: 导出CSV

    表  2  能量耗散与σt/σp和应力降指标乘积的线性拟合结果

    Table  2.   Linear fitting results of energy dissipation and product of σt/σp and stress drop index

    试样编号能量耗散速率与σt/σp
    和应力降速率乘积
    能量耗散量与σt/σp
    和应力降乘积
    拟合优度斜率拟合优度斜率
    C1 1 0.832 6 0.998 8 0.814 1
    C2 1 1.120 4 0.996 7 0.591 2
    C3 1 1.634 7 0.993 9 1.550 4
    C4 0.999 8 2.391 2 0.999 4 3.160 5
    C5 1 2.720 2 0.998 7 2.510 8
    平均值 1 1.739 8 0.997 5 1.725 4
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-11-01
  • 修回日期:  2022-04-08
  • 网络出版日期:  2022-03-05

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