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冻融循环条件下含软弱夹层隧道围岩力学性质及破坏特征

张立

张立. 冻融循环条件下含软弱夹层隧道围岩力学性质及破坏特征[J]. 水文地质工程地质, 2021, 48(5): 74-80. doi: 10.16030/j.cnki.issn.1000-3665.202102035
引用本文: 张立. 冻融循环条件下含软弱夹层隧道围岩力学性质及破坏特征[J]. 水文地质工程地质, 2021, 48(5): 74-80. doi: 10.16030/j.cnki.issn.1000-3665.202102035
ZHANG Li. On mechanical properties and failure characteristics of surrounding rock of tunnel with weak interlayer under freezing-thawing cycles[J]. Hydrogeology & Engineering Geology, 2021, 48(5): 74-80. doi: 10.16030/j.cnki.issn.1000-3665.202102035
Citation: ZHANG Li. On mechanical properties and failure characteristics of surrounding rock of tunnel with weak interlayer under freezing-thawing cycles[J]. Hydrogeology & Engineering Geology, 2021, 48(5): 74-80. doi: 10.16030/j.cnki.issn.1000-3665.202102035

冻融循环条件下含软弱夹层隧道围岩力学性质及破坏特征

doi: 10.16030/j.cnki.issn.1000-3665.202102035
基金项目: 2019年中咨集团资助项目(KY201903)
详细信息
    作者简介:

    张立(1982-),男,硕士,高级工程师,从事隧道与边坡研究设计工作。E-mail:changshan0606992@163.com

  • 中图分类号: TU458+.3

On mechanical properties and failure characteristics of surrounding rock of tunnel with weak interlayer under freezing-thawing cycles

  • 摘要: 川藏铁路沿线隧道围岩中常存在大量软弱夹层,且岩体受严寒气候影响较大。为研究夹层倾角和冻融循环对隧道围岩力学性质的影响,室内制备了不同软弱夹层倾角、不同冻融循环次数条件下的互层岩体,并对含软弱夹层岩体展开了单轴压缩试验。研究发现:(1)含软弱夹层岩体的硬岩部分变形较小,而软岩夹层部分的破坏更加剧烈。夹层倾角较小时(β=0°、30°)岩体破坏后裂纹与夹层倾角接近平行,当夹层倾角较大时岩体破裂面与夹层呈X型交叉状;冻融循环次数越多,岩体的破坏程度越强烈。(2)随着夹层倾角的增大,岩体的单轴抗压强度和弹性模量先减小后增大;当夹层倾角β=45°时,抗压强度和弹性模量最小,抗压强度较含水平软弱夹层岩体降低35.27%,弹性模量降低34.84%。(3)冻融循环劣化了夹层岩体的力学性质,岩体承载能力随着冻融循环次数的增加而减弱,但塑性变形能力有所增强。在冻融循环作用的影响下,岩体抗压强度、弹性模量呈负指数型递减,峰值点应变则呈线性增大。
  • 图  1  岩体试样

    Figure  1.  Rock mass specimens

    图  2  典型夹层岩体单轴应力-应变曲线及变形破坏过程

    Figure  2.  Typical stress-strain curves of rock mass with weak interlayer and deformation diagrams

    图  3  不同状态下含软弱夹层岩体应力-应变曲线

    Figure  3.  Stress-strain curves of muddy limestone under different water-bearing conditions

    图  4  岩体力学参数随冻融循环次数变化关系

    Figure  4.  Mechanical parameters of rock mass evolves with freezing thawing cycles

    表  1  含软弱夹层岩体物理参数

    Table  1.   Physical parameters of rock mass containing weak interlayer

    分组直径/mm高度/mm平均密度/(g·cm−3夹层厚度/mm夹层倾角/(°)
    A50.1299.752.3719.950
    B50.08100.542.3620.7030
    C49.86100.132.3419.8045
    D50.32100.332.3220.0360
    下载: 导出CSV

    表  2  不同试验条件下岩体破坏形态特征

    Table  2.   Faliure characteristics of rock mass specimen under different testing conditions

    试验条件n=0n=10n=20n=30
    β=0°
    β=30°
    β=45°
    β=60°
    下载: 导出CSV

    表  3  不同条件下含软弱夹层岩体力学参数

    Table  3.   Mechanical parameters of rock mass with weak interlayer under different conditions

    分组倾角/(°)循环次数抗压强度/MPa峰值点应变/%弹性模量/GPa
    A0 016.910.763.86
    1013.701.212.70
    2011.731.232.03
    3010.511.501.55
    B30 014.820.633.53
    1011.060.712.34
    20 8.710.761.71
    30 7.791.011.16
    C45 011.070.553.03
    10 8.850.751.78
    20 7.530.801.11
    30 6.801.190.86
    D60 015.550.643.63
    1012.820.792.44
    2010.600.881.81
    30 9.581.141.27
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-02-27
  • 修回日期:  2021-04-20
  • 网络出版日期:  2021-09-09
  • 刊出日期:  2021-09-10

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