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西藏贡觉粉砂质泥岩工程地质特性与蠕变强度研究

郭长宝 王磊 李任杰 吉锋 王炀 严孝海 刘贵

郭长宝, 王磊, 李任杰, 吉锋, 王炀, 严孝海, 刘贵. 西藏贡觉粉砂质泥岩工程地质特性与蠕变强度研究[J]. 水文地质工程地质, 2021, 48(5): 54-64. doi: 10.16030/j.cnki.issn.1000-3665.202107012
引用本文: 郭长宝, 王磊, 李任杰, 吉锋, 王炀, 严孝海, 刘贵. 西藏贡觉粉砂质泥岩工程地质特性与蠕变强度研究[J]. 水文地质工程地质, 2021, 48(5): 54-64. doi: 10.16030/j.cnki.issn.1000-3665.202107012
GUO Changbao, WANG Lei, LI Renjie, JI Feng, WANG Yang, YAN Xiaohai, LIU Gui. Engineering geology properties and creeping strength characteristics of the silty mudstone in Gongjue County in Tibet of China[J]. Hydrogeology & Engineering Geology, 2021, 48(5): 54-64. doi: 10.16030/j.cnki.issn.1000-3665.202107012
Citation: GUO Changbao, WANG Lei, LI Renjie, JI Feng, WANG Yang, YAN Xiaohai, LIU Gui. Engineering geology properties and creeping strength characteristics of the silty mudstone in Gongjue County in Tibet of China[J]. Hydrogeology & Engineering Geology, 2021, 48(5): 54-64. doi: 10.16030/j.cnki.issn.1000-3665.202107012

西藏贡觉粉砂质泥岩工程地质特性与蠕变强度研究

doi: 10.16030/j.cnki.issn.1000-3665.202107012
基金项目: 中国地质调查局地质调查项目(DD20190319;20190505);国家自然科学基金项目(41877279;41731287;41941017);自然资源部杰出青年科技人才项目(12110600000018003911)
详细信息
    作者简介:

    郭长宝(1980-),男,博士,研究员,博士生导师,主要从事工程地质与地质灾害调查研究。E-mail:guochangbao@163.com

  • 中图分类号: TU458+.3

Engineering geology properties and creeping strength characteristics of the silty mudstone in Gongjue County in Tibet of China

  • 摘要: 川藏铁路在穿越西藏贡觉地区时遇到三叠系粉砂质泥岩,在高地应力条件下容易发生大变形等危害。文章开展了不同围压下的岩石三轴压缩和和三轴蠕变试验,结合PFC数值模拟,研究了粉砂质泥岩在不同围压下的蠕变特性和长期强度研究,结果表明:贡觉粉砂质泥岩流变具有西原蠕变模型特征,蠕变与常规三轴试验条件下,随着围压不断增大,粉砂质泥岩试样均由拉-剪破坏向单剪破坏过渡,剪切破裂面与水平线的夹角逐渐减小,微裂纹数量减少;蠕变试验相较于常规三轴试验,由拉应力引起的压碎带影响范围更广;在高围压条件下,粉砂质泥岩更容易发生流变,随着围压的增大,轴向应变、侧向应变和体积应变均增大,微裂纹数量呈下降趋势;瞬时弹性模量及黏弹性系数与围压呈线性递增关系,黏弹性模量与围压呈对数型增长关系,黏塑性系数与围压呈指数型增长关系。在荷载长期作用下,岩石长期强度低于瞬时强度。
  • 图  1  贡觉某隧道段地层岩性分布图(线路为示意图,据文献[1]修编)

    1—全新世冲积物;2—古近系贡觉组;3—上三叠统夺盖拉组;4—上三叠统阿堵拉组;5—上三叠统波里拉组;6—上三叠统甲丕拉组;7—上三叠统洞卡组;8—上三叠统东独组;9—上三叠统公也弄组;10—中下三叠统马拉松多组;11—下侏罗统汪布组;12—下二叠统里查组;13—中石炭统骜曲组;14—宁多岩群;15—晚三叠世正长花岗岩;16—晚三叠世花岗闪长岩;17—晚三叠世闪长玢岩;18—花岗斑岩脉;19—辉绿玢岩脉;20—闪长玢岩脉;21—闪长岩脉;22—断裂;23—拟建铁路走向示意图;24—钻孔;25—水系

    Figure  1.  Lithology distribution of the Gongjue Section along the Sichuan-Tibet Railway(modified from Ref. [1])

    图  2  粉砂质泥岩试样常规三轴试验结果

    Figure  2.  Photo of the sample failure and Mohr’s circle under conventional triaxial test conditions

    图  3  不同围压下试样三轴压缩轴向应变蠕变历时时间曲线

    Figure  3.  Specimen triaxial compression creep test time curve under different confining pressures

    图  4  不同围压下试样三轴压缩轴向应变蠕变叠加曲线

    Figure  4.  Specimen triaxial compression creep test superposition curve under different confining pressures

    图  5  各围压条件下瞬时应变增量-应力曲线

    Figure  5.  Instantaneous strain increment - stress curve under various confining pressures

    图  6  三轴压缩蠕变试验条件下试样破裂形态

    Figure  6.  Fracture morphology of specimens under the creep test condition

    图  7  粉砂质泥岩的拉、剪裂纹示意图

    Figure  7.  Diagram of tensile and shear cracks in rock

    图  8  室内试验与数值模拟试验应力-应变曲线

    Figure  8.  Laboratory test and curve of stress - strain of the numerical simulation test

    图  9  不同围压下数值模拟试验裂纹分布及破坏模式图(红色为剪切裂纹,蓝色为拉张裂纹)

    Figure  9.  Crack distribution and failure mode diagram of the numerical simulation test under different confining pressures

    图  10  试样侧向应变和体积应变-时间步曲线

    Figure  10.  Lateral strain and volumetric strain-time step curves of the sample

    图  11  不同围岩条件下轴向等时-应力应变曲线

    Figure  11.  Axial isochronous-stress-strain curves under different confining pressures

    图  12  长期流动极限线性拟合

    Figure  12.  Linear fitting of the long term flow limit

    图  13  西原模型示意图

    Figure  13.  Schematic diagram of the Xiyuan model

    表  1  岩石力学实验加载方式

    Table  1.   Experimental loading method

    试验类别 试样编号 围压/MPa 加载方式
    常规三轴 GJ-1 5 先以1 MPa/min的速率施加围压,
    待围压达到设定围压并稳定后,
    轴向荷载以5 MPa/min速率
    加载至试样产生破坏
    GJ-2 10
    GJ-3 15
    三轴蠕变 GJ-4 5 以1 MPa/min的速率施加围压,
    待围压达到设定围压并稳定后
    分级施加轴向荷载,轴向荷载
    以5 MPa/min速率加载,每一
    级应力恒定时间为24 h
    GJ-5 10
    GJ-4 15
    下载: 导出CSV

    表  2  贡觉粉砂质泥岩室内试验基本力学参数

    Table  2.   Basic mechanical parameters of the laboratory tests

    试样编号 密度/
    (g·cm−3
    围压
    σ3/MPa
    轴向压力
    σ1/MPa
    偏应力峰值
    qf/MPa
    黏聚力
    c/MPa
    内摩擦角
    φ/(°)
    1 2.64 5 40.95 35.95 6.47 37.47
    2 2.61 10 71.71 61.71
    3 2.67 15 88.09 73.09
    下载: 导出CSV

    表  3  用于PFC数值模拟的粉砂质泥岩细观参数

    Table  3.   PFC microscopic parameters of silty mudstone

    细观参数 参数类型 参数值
    颗粒参数 颗粒模量/GPa 1.486
    刚度比 1.4
    摩擦系数 0.5
    平行粘结参数 粘结模量/GPa 27.5
    刚度比 1.4
    抗拉强度/MPa 105
    黏聚力/MPa 275
    内摩擦角/(°) 42
    下载: 导出CSV

    表  4  长期强度参数

    Table  4.   Long-term strength parameter

    围压
    σ3/MPa
    长期流动极限
    σs/MPa
    σs/σ0 黏聚力
    c/ MPa
    内摩擦角
    φ/(°)
    5 28.08 0.71 4.11 28.81
    10 42.93 0.60
    15 56.57 0.64
    下载: 导出CSV

    表  5  西原模型各流变参数

    Table  5.   Rheological parameters of the visco-elastoplastic creep model

    σ3 /MPa σs /MPa E0/GPa E1/GPa η2/(GPa·h) η1/(GPa·h)
    5 28.08 1.35 4.85 14.76 20.54
    10 42.93 1.88 9.16 111.75 49.60
    15 56.57 1.67 10.31 291.25 63.88
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-06-20
  • 修回日期:  2021-07-30
  • 网络出版日期:  2021-09-09
  • 刊出日期:  2021-09-10

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