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大理岩真三轴单面卸荷条件下加卸载试验研究

许文松 赵光明 孟祥瑞 李英明 蔡金龙 高亮

许文松, 赵光明, 孟祥瑞, 李英明, 蔡金龙, 高亮. 大理岩真三轴单面卸荷条件下加卸载试验研究[J]. 西南交通大学学报, 2019, 54(3): 526-534. doi: 10.3969/j.issn.0258-2724.20180542
引用本文: 许文松, 赵光明, 孟祥瑞, 李英明, 蔡金龙, 高亮. 大理岩真三轴单面卸荷条件下加卸载试验研究[J]. 西南交通大学学报, 2019, 54(3): 526-534. doi: 10.3969/j.issn.0258-2724.20180542
XU Wensong, ZHAO Guangming, MENG Xiangrui, LI Yingming, CAI Jinlong, GAO Liang. Test Study on True-Triaxial Loading and Unloading for Marble with Unloaded Single Face[J]. Journal of Southwest Jiaotong University, 2019, 54(3): 526-534. doi: 10.3969/j.issn.0258-2724.20180542
Citation: XU Wensong, ZHAO Guangming, MENG Xiangrui, LI Yingming, CAI Jinlong, GAO Liang. Test Study on True-Triaxial Loading and Unloading for Marble with Unloaded Single Face[J]. Journal of Southwest Jiaotong University, 2019, 54(3): 526-534. doi: 10.3969/j.issn.0258-2724.20180542

大理岩真三轴单面卸荷条件下加卸载试验研究

doi: 10.3969/j.issn.0258-2724.20180542
基金项目: 国家重点研发计划资助项目(SQ2017YFSF040045);国家自然科学基金资助项目(51374013,51674008,51474006,51574006);安徽省科技攻关计划资助项目(1604a0802107);高校优秀拔尖人才培育资助项目(gxbjZD2016051);安徽高校科研平台创新团队建设资助项目;安徽省学术和技术带头人及后备人选学术科研活动资助项目(2015H036)
详细信息
    作者简介:

    许文松(1986—),男,助教,博士研究生,研究方向为岩土与地下工程,E-mail:359879021@qq.com

    通讯作者:

    蔡金龙(1981—),男,助教,博士研究生,研究方向为岩土与地下工程,E-mail:25072103@qq.com

Test Study on True-Triaxial Loading and Unloading for Marble with Unloaded Single Face

  • 摘要: 为了准确地评价巷(隧)道开挖面附近围岩的稳定性,采用真三轴卸荷扰动岩石测试系统对大理岩岩样进行第三主应力单面卸荷加、卸载试验研究. 通过高应力巷(隧)道开挖围岩失稳机理分析,采用不同应力加卸路径模拟能量积聚型和应力集中型两种物理工程破坏模型,进一步分析两种破坏模型的应力-应变曲线规律、破坏特征和强度特征. 研究结果表明:随着卸荷面应力的减小出现扩容现象,主要破坏面在临空面附近,随着轴压的升高,劈裂破坏范围增大,卸荷临界值也增大;随着围压增高,屈服点和峰值点增大,并且屈服点和峰值之间的曲线斜率较为平缓,破坏由局部张拉-劈裂-剪切复合性破坏发展成整体劈裂破坏;同围压条件下卸荷破坏强度是加载破坏强度的80%,岩体卸荷比加载更容易破坏,进而修正了广义Hoek-Brown强度准则.

     

  • 图 1  巷道开挖模型

    Figure 1.  Roadway excavation model

    图 2  真三轴扰动卸荷岩石测试系统

    Figure 2.  True-triaxial unloading disturbance testing system

    图 3  试验加卸载路径示意

    Figure 3.  Loading and unloading paths in tests

    图 4  岩样放置空间位置示意

    Figure 4.  Pictures of marble sample installation

    图 5  加、卸荷应力-应变曲线对比

    Figure 5.  Stress-strain curves under loading and unloading conditions

    图 6  能量积聚型单面卸荷破坏应力-应变曲线

    Figure 6.  Stress-strain curves of energy accumulation failure with single-face unloading

    图 7  轴向应力与卸荷面临界值拟合曲线

    Figure 7.  Fitting curve for the critical values with single-face unloading vs. axial stress

    图 8  单面卸荷应力集中型破坏应力-应变曲线

    Figure 8.  Stress-strain curves of stress concentration failure model with single-face unloading

    图 9  常规单轴压缩宏观破坏示意

    Figure 9.  Conventional uniaxial compression failure

    图 10  能量积聚型单面卸荷宏观破坏示意

    Figure 10.  Energy accumulation failure of marble samples with single-face unloading

    图 11  单面卸荷应力集中型宏观破坏示意

    Figure 11.  Stress concentration failure of marble samples with single-face unloading

    图 12  修正Hoek-Brown强度准则验证试验

    Figure 12.  Validation of modified Hoek-Brown strength criterion

    表  1  初始应力值

    Table  1.   Initial stresses

    岩样编号$ {\sigma _1}$$ {\sigma _2}$$ {\sigma _3}$
    1#000
    2#140.020.010.0
    3#160.020.010.0
    4#180.020.010.0
    5#200.020.010.0
    6#220.020.010.0
    7#50.05.02.5
    8#50.010.05.0
    9#50.020.010.0
    10#50.030.020.0
    下载: 导出CSV

    表  2  第三主应力单面卸荷临界值

    Table  2.   Critical values of minimum principal stress under single-face unloading condition

    轴压卸荷临界值破坏程度
    1400不破坏
    1600.38破坏
    1800.74破坏
    2001.62剧烈破坏
    2202.99剧烈破坏
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-06-28
  • 修回日期:  2018-09-18
  • 网络出版日期:  2018-09-20
  • 刊出日期:  2019-06-01

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