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中间主应力影响下含瓦斯复合煤岩体变形渗流及能量演化特征研究

王凯 赵恩彪 郭阳阳 杜锋 王龙

王凯, 赵恩彪, 郭阳阳, 杜锋, 王龙. 中间主应力影响下含瓦斯复合煤岩体变形渗流及能量演化特征研究[J]. 矿业科学学报, 2023, 8(1): 74-82. doi: 10.19606/j.cnki.jmst.2023.01.007
引用本文: 王凯, 赵恩彪, 郭阳阳, 杜锋, 王龙. 中间主应力影响下含瓦斯复合煤岩体变形渗流及能量演化特征研究[J]. 矿业科学学报, 2023, 8(1): 74-82. doi: 10.19606/j.cnki.jmst.2023.01.007
Wang Kai, Zhao Enbiao, Guo Yangyang, Du Feng, Wang Long. Deformation, seepage and energy evolution characteristics of gas-bearing coal-rock under intermediate principal stress[J]. Journal of Mining Science and Technology, 2023, 8(1): 74-82. doi: 10.19606/j.cnki.jmst.2023.01.007
Citation: Wang Kai, Zhao Enbiao, Guo Yangyang, Du Feng, Wang Long. Deformation, seepage and energy evolution characteristics of gas-bearing coal-rock under intermediate principal stress[J]. Journal of Mining Science and Technology, 2023, 8(1): 74-82. doi: 10.19606/j.cnki.jmst.2023.01.007

中间主应力影响下含瓦斯复合煤岩体变形渗流及能量演化特征研究

doi: 10.19606/j.cnki.jmst.2023.01.007
基金项目: 

国家自然科学基金 52130409

国家自然科学基金 52121003

国家自然科学基金 52004291

详细信息
    作者简介:

    王凯(1972 —),男,河南遂平人,教授,博士生导师,主要从事安全工程与应急管理、矿井瓦斯及煤岩动力灾害防治、矿井通风等方面的教学与研究工作。Tel:13810850966,E-mail:kaiwang@cumtb.edu.cn

    通讯作者:

    郭阳阳(1993 —),男,河北邢台人,博士研究生,主要从事矿井瓦斯灾害机理研究及防治工作。Tel:18032683383,E-mail:doubleYGuo@163.com

  • 中图分类号: TD713

Deformation, seepage and energy evolution characteristics of gas-bearing coal-rock under intermediate principal stress

  • 摘要: 深部环境中,复合煤岩体处于三向不等应力状态,中间主应力的存在对煤岩体变形、强度特性及能量演化特征有着重要影响。本文利用真三轴气固耦合煤岩渗流试验装置,开展了不同中间主应力条件下含瓦斯复合煤岩体变形-渗流试验研究。结果表明:①随着中间主应力的增大,当达到峰值强度时,试件最大主应力方向应变呈现先增大后减小的变化,中间主应力方向应变和最小主应力方向应变之间的差值越来越大;②低中间主应力下试件中间主应力方向呈现出膨胀变形,中间主应力较大时,ε2σ曲线达到峰值后发生回弹,中间主应力方向最终表现为压缩变形;③随着中间主应力的增大,试件相对渗透率系数谷值降低,相对渗透率系数曲线峰值拐点与ε1σ曲线的拐点一致;④达到应力峰值时,试件总输入能量先增大后减小,与试件强度变化趋势类似,弹性应变能先增大后减小,耗散能持续增大,Ue/U先升高后降低,Ud/U先降低后升高。
  • 图  1  真三轴气固耦合煤岩渗流试验装置示意图

    1—真三轴压力室;2—液压伺服系统;3—气体流量计;4—数据采集装置

    Figure  1.  True triaxial gas-solid coupling seepage test device for coal and rock

    图  2  复合煤岩体试件

    Figure  2.  Composite coal-rock specimen

    图  3  真三轴应力路径示意图

    Figure  3.  Diagram of true triaxial stress path

    图  4  不同中间主应力下试件应力-应变-渗透率动态曲线

    Figure  4.  Stress-strain dynamic curves of specimens under different intermediate principal stress

    图  5  复合煤岩体强度特征曲线

    Figure  5.  Strength characteristic curve of composite coal-rock

    图  6  不同中间主应力影响下渗透率相对系数变化

    Figure  6.  Permeability coefficient under different intermediate principal stress

    图  7  复合煤岩体试件加载破坏全过程应力和能量与应变动态规律

    Figure  7.  Dynamic law of stress, energy and strain during loading failure of coal-rock

    图  8  不同中间主应力下峰前阶段试件能量-应变关系

    Figure  8.  Energy-strain evolution of gas-bearing coal-rock under different intermediate principal stress

    图  9  应力峰值处能量特征值

    Figure  9.  Energy characteristic value at stress peak

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  • 收稿日期:  2022-07-04
  • 修回日期:  2022-08-29
  • 刊出日期:  2023-02-28

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