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怒江某隐伏断层带岩体的力学参数取值

周洪福 韦玉婷

周洪福, 韦玉婷. 怒江某隐伏断层带岩体的力学参数取值[J]. 西南交通大学学报, 2022, 57(1): 166-172, 199. doi: 10.3969/j.issn.0258-2724.20200314
引用本文: 周洪福, 韦玉婷. 怒江某隐伏断层带岩体的力学参数取值[J]. 西南交通大学学报, 2022, 57(1): 166-172, 199. doi: 10.3969/j.issn.0258-2724.20200314
ZHOU Hongfu, WEI Yuting. Mechanical Parameters of Concealed Fault Rock Mass on Nujiang River[J]. Journal of Southwest Jiaotong University, 2022, 57(1): 166-172, 199. doi: 10.3969/j.issn.0258-2724.20200314
Citation: ZHOU Hongfu, WEI Yuting. Mechanical Parameters of Concealed Fault Rock Mass on Nujiang River[J]. Journal of Southwest Jiaotong University, 2022, 57(1): 166-172, 199. doi: 10.3969/j.issn.0258-2724.20200314

怒江某隐伏断层带岩体的力学参数取值

doi: 10.3969/j.issn.0258-2724.20200314
基金项目: 四川省重点研发计划(2020YFS0296)
详细信息
    作者简介:

    周洪福(1980—),男,教授级高工,博士,研究方向为工程地质和地质灾害,E-mail:zhf800726@163.com

  • 中图分类号: TV223.1

Mechanical Parameters of Concealed Fault Rock Mass on Nujiang River

  • 摘要:

    断层带岩体是工程建设中重点关注的一类特殊岩体,为了获取考虑围压效应的隐伏断层带岩体真实力学参数,依托怒江某水电工程,对坝基深厚覆盖层下隐伏断层带岩体开展三轴试验. 总结了一套断层带岩体取样—试验前处理—施加初始围压—三轴试验—参数取值的评价方法,可避免三轴试验过程中断层带岩体散体以及液压油对试样的影响,使试验结果更接近断层带岩体天然状态下的真实力学参数. 试验结果表明:5个断层带岩体试样的变形模量为449~921 MPa,平均值为665 MPa;黏聚力为0.04~0.22 MPa,平均值为0.13 MPa,取80%保证率的标准值为0.12 MPa;内摩擦系数为0.32~0.61,平均值为0.46,取80%保证率的标准值为0.35;黏聚力试验值比内摩擦系数试验值离散性大,表明断层带岩体黏聚力受物质结构、断层泥含量、胶结程度等的影响更大.

     

  • 图 1  怒江某水电工程坝址区地形地貌

    Figure 1.  Topographic and geomorphological features of a hydropower station on the Nujiang river

    图 2  怒江某水电站坝址区发育隐伏断层带岩体

    Figure 2.  The concealed fault rock mass of a hydropower station on the Nujiang river

    图 3  断层带岩体

    Figure 3.  Fault rock mass

    图 4  1号试样σ1-σ3关系曲线

    Figure 4.  The curve between σ1 and σ3 of sample 1

    表  1  试样物理指标

    Table  1.   Physical values of samples

    试样
    编号
    取样
    位置
    深度/m直径/cm高/cm重量/g密度/
    (g•cm−3)
    1 号 ZK122 33 5.3 9.9 515 2.36
    2 号 ZK122 39 6.1 11.2 769 2.35
    3 号 ZK128 65 5.6 9.8 558 2.31
    4 号 ZK114 70 5.7 10.1 597 2.32
    5 号 ZK114 62 5.1 9.5 460 2.37
    下载: 导出CSV

    表  2  断层带岩体变形模型试验结果

    Table  2.   Test results of deformation modulus of the fault rock mass MPa

    试样编号变形模量
    第 1 个第 2 个第 3 个
    1 号728609492
    2 号501511449
    3 号832838825
    4 号921813607
    5 号625622596
    下载: 导出CSV

    表  3  三轴试验结果

    Table  3.   Results of triaxial test

    试样编号σ1/MPaσ3/MPaC/MPaf
    1 号 0.96 0.17 0.13 0.52
    1.28 0.33
    1.60 0.45
    1.84 0.54
    2.23 0.70
    2.89 0.82
    2.91 0.96
    2 号 0.95 0.15 0.04 0.61
    1.26 0.31
    1.66 0.49
    1.91 0.63
    2.34 0.82
    3.09 0.97
    3.62 1.16
    5.09 1.37
    3 号 0.82 0.12 0.22 0.35
    1.13 0.30
    1.63 0.43
    1.95 0.61
    2.02 0.77
    4 号 1.28 0.21 0.17 0.49
    1.72 0.39
    1.93 0.56
    2.07 0.78
    2.48 0.96
    4.29 1.23
    5 号 0.66 0.23 0.08 0.32
    1.05 0.48
    1.36 0.73
    1.50 0.87
    1.94 1.09
    2.47 1.36
    3.17 1.62
    3.96 1.95
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-06-02
  • 修回日期:  2020-08-13
  • 网络出版日期:  2020-09-15
  • 刊出日期:  2020-09-15

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