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深埋锦屏大理岩力学特性与能量演化研究

楼晨笛 张朝鹏 吴世勇 周济芳 彭媛 艾婷 刘洋 张茹 任利

楼晨笛,张朝鹏,吴世勇,等. 深埋锦屏大理岩力学特性与能量演化研究[J]. 水利水运工程学报,2022(4):87-96. doi:  10.12170/20210524002
引用本文: 楼晨笛,张朝鹏,吴世勇,等. 深埋锦屏大理岩力学特性与能量演化研究[J]. 水利水运工程学报,2022(4):87-96. doi:  10.12170/20210524002
(LOU Chendi, ZHANG Zhaopeng, WU Shiyong, et al. Study on mechanical properties and energy evolution of Jinping deep buried marble[J]. Hydro-Science and Engineering, 2022(4): 87-96. (in Chinese)) doi:  10.12170/20210524002
Citation: (LOU Chendi, ZHANG Zhaopeng, WU Shiyong, et al. Study on mechanical properties and energy evolution of Jinping deep buried marble[J]. Hydro-Science and Engineering, 2022(4): 87-96. (in Chinese)) doi:  10.12170/20210524002

深埋锦屏大理岩力学特性与能量演化研究

doi: 10.12170/20210524002
基金项目: 国家自然科学基金资助项目(U1965203)
详细信息
    作者简介:

    楼晨笛(1998—),男,浙江东阳人,硕士研究生,主要从事岩土工程相关研究。E-mail:louchendi@stu.scu.edu.cn

    通讯作者:

    张朝鹏(E-mail:zhangzp@scu.edu.cn

  • 中图分类号: TU45

Study on mechanical properties and energy evolution of Jinping deep buried marble

  • 摘要: 与浅层岩体相比,深层岩体赋存环境更为复杂,导致其力学特性与常见的浅部岩体存在较大差异。锦屏二级隧洞工程最大埋深超过2 500 m,其引水隧洞最高地应力达70 MPa,开展高应力条件下硬岩的力学特性研究,具有重要的理论价值和现实意义。采用四川大学MTS815岩石力学试验系统对取自2 400 m深的锦屏大理岩开展单轴和三轴压缩等系列静态力学试验。试验结果表明:锦屏大理岩的单轴抗压强度为180.43 MPa,随围压的增长,大理岩表现出“脆-延-塑”力学特征,围压32.0 MPa为分界点;同时,起裂应力、损伤应力和峰值应力均具有相似的增长趋势,所定义的脆性指标的下降趋势逐渐趋于平缓;低围压下,弹性能在峰前占主导,而高围压下,耗散能增长更为显著,弹性能峰前峰后差值减小,表现出更为明显的塑性特征。研究结果为准确描述深层岩石力学行为、确保深部工程稳定性提供了一定的理论基础。
  • 图  1  静态力学试验示意图

    Figure  1.  Schematic diagram of static mechanical test

    图  2  锦屏大理岩不同深度条件下的应力应变曲线

    Figure  2.  Stress-strain curve of Jinping marble at different depths

    图  3  锦屏大理岩特征力学参数与围压的关系

    Figure  3.  Relationship between characteristic mechanical parameters and confining pressure of Jinping marble

    图  4  锦屏二级水电站不同位置埋深大理岩峰值应力与围压关系[19-21]

    Figure  4.  Relationship between peak stress and confining pressure of marble at different depths[19-21]

    图  5  锦屏大理岩单轴压缩破坏形态

    Figure  5.  Failure mode of marble under uniaxial compression        

    图  6  锦屏大理岩三轴压缩破坏形态

    Figure  6.  Failure mode of marble under conventional triaxial compression

    图  7  起裂应力和裂纹损伤应力的确定(以10-64-1试件为例)

    Figure  7.  Determination of crack initiation stress and crack damage stress (taking 10-64-1 as an example)

    图  8  特征应力-围压关系曲线

    Figure  8.  Characteristic stress-confining pressure curve

    图  9  起裂及损伤应力水平-围压关系曲线

    Figure  9.  Crack initiation and damage stress level-confining pressure curve

    图  10  应力-塑性变形量曲线

    Figure  10.  Stress-plastic deformation curve

    图  11  脆性指标-围压关系曲线

    Figure  11.  Relationship curve between brittleness index and confining pressure

    图  12  围压-能量特征值关系曲线

    Figure  12.  Relationship curve between confining pressure and energy eigenvalue

    图  13  峰值应力处能量特征值变化关系

    Figure  13.  Changes of energy eigenvalues at peak stress

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  • 收稿日期:  2021-05-24
  • 网络出版日期:  2022-07-06
  • 刊出日期:  2022-08-23

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