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不同滑带角度滑坡作用下隧道衬砌结构受力特征

邵江 朱宝龙 李涛

邵江, 朱宝龙, 李涛. 不同滑带角度滑坡作用下隧道衬砌结构受力特征[J]. 西南交通大学学报, 2021, 56(6): 1214-1221, 1231. doi: 10.3969/j.issn.0258-2724.20200054
引用本文: 邵江, 朱宝龙, 李涛. 不同滑带角度滑坡作用下隧道衬砌结构受力特征[J]. 西南交通大学学报, 2021, 56(6): 1214-1221, 1231. doi: 10.3969/j.issn.0258-2724.20200054
SHAO Jiang, ZHU Baolong, LI Tao. Stress Characteristics of Tunnel Lining Structures Under Landslides with Different Angles of Sliding Zone[J]. Journal of Southwest Jiaotong University, 2021, 56(6): 1214-1221, 1231. doi: 10.3969/j.issn.0258-2724.20200054
Citation: SHAO Jiang, ZHU Baolong, LI Tao. Stress Characteristics of Tunnel Lining Structures Under Landslides with Different Angles of Sliding Zone[J]. Journal of Southwest Jiaotong University, 2021, 56(6): 1214-1221, 1231. doi: 10.3969/j.issn.0258-2724.20200054

不同滑带角度滑坡作用下隧道衬砌结构受力特征

doi: 10.3969/j.issn.0258-2724.20200054
基金项目: 国家自然科学基金(41672342);四川省应用基础研究(2019YJ0555)
详细信息
    作者简介:

    邵江(1972—),男,正高级工程师,博士,研究方向为岩土勘察及设计,E-mail:469098689@qq.com

    通讯作者:

    朱宝龙(1976—),男,教授,博士,研究方向为岩土与地下工程,E-mail:zhubaolong@swust.edu.cn

  • 中图分类号: U452.2

Stress Characteristics of Tunnel Lining Structures Under Landslides with Different Angles of Sliding Zone

  • 摘要:

    随着越来越多的隧道工程穿越滑坡区,滑坡与隧道相互作用过程的研究尤为重要. 为研究不同滑带角度滑坡对隧道衬砌结构受力的影响,以大(同)准(格尔)铁路南坪隧道为例,采用室内模型试验、数值模拟的方法,对0°、10°、20°、30°、40°、50°不同滑带角度条件下滑坡推力作用下隧道衬砌结构受力的影响特征及变化规律进行研究. 研究结果表明:滑带角度越小,隧道变形越大,作用在隧道衬砌结构上的弯矩、剪力及土压力越大,并在拱脚处出现最大值,形成隧道拱结构左右受力不对称特征,呈现偏压现象;通过计算隧道拱结构左右两侧的竖向偏压应力比显示,在拱肩位置且滑带为0时,偏压应力比为1.17,随着滑带角度的增大,隧道衬砌拱结构左右应力差越来越小,趋于平衡拱;在拱脚位置,偏压应力比随滑带角度的增大而逐渐增大,隧道衬砌拱结构左右两侧所受应力差越来越大,趋向于偏压隧道,最小偏压比和最大偏压比分别为1.08、1.87.

     

  • 图 1  南坪隧道地质剖面

    Figure 1.  Geological profile of Nanping Tunnel

    图 2  滑坡-隧道模型示意

    Figure 2.  Landslide-tunnel model

    图 3  隧道测点布置

    Figure 3.  Layout of the tunnel measuring points

    图 4  不同滑带角度条件下坡体位移

    Figure 4.  Displacements of slope with various angles of sliding zone

    图 5  滑带30° 与隧道结构数值模拟模型

    Figure 5.  Numerical simulation model at sliding angle 30°

    图 6  30° 滑带角度作用下隧道位移

    Figure 6.  Displacements of tunnel at sliding angle 30°

    图 7  30° 滑带角度作用下隧道弯矩

    Figure 7.  Bending moments of tunnel at sliding angle 30°

    表  1  模型试验材料力学参数

    Table  1.   Mechanical parameters of model materials

    名称密度 ρ/
    (kg•m−3
    E/MPac/kPaφ/(°)
    滑坡体1 90018.6527.7925.35
    滑带1 8009.3615.8215.63
    滑床2 20023.7254.2454.32
    隧道衬砌2 100289.61236.6561.71
    下载: 导出CSV

    表  2  模型试验加载方案

    Table  2.   Loading scheme in model test

    滑带角度/(°)荷载/kN加载时
    间/min
    维持时
    间/min
    0、10、20、30、40、500.51020
    1.01020
    5.02040
    10.02040
    15.02040
    20.03040
    25.03040
    下载: 导出CSV

    表  3  不同滑带角度下隧道弯矩与剪应力值

    Table  3.   Bending and shear stress values of tunnel under different angles of sliding zone

    滑带角度/(°)弯矩/(kN•m)剪力/kN
    0
    10
    20
    30
    40
    50
    下载: 导出CSV

    表  4  不同滑带角度下隧道土压力值

    Table  4.   Distribution of earth pressure on tunnel under different angles of sliding zone

    滑带角度/(°)土压力分布/kPa
    0
    10
    20
    30
    40
    50
    下载: 导出CSV

    表  5  模型试验下不同滑带角度隧道衬砌偏压应力比

    Table  5.   Bias stress ratio at different sliding angles in model test

    滑带角度/(°)Δ1Δ2
    01.171.08
    101.091.25
    201.041.27
    301.071.29
    401.021.54
    501.011.87
    下载: 导出CSV

    表  6  数值模拟下不同滑带角度隧道衬砌偏压应力比

    Table  6.   Bias stress ratios in numerical simulation

    滑带角度/(°)Δ1Δ2
    01.210.98
    101.201.22
    201.141.25
    301.111.48
    401.091.83
    501.062.34
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-02-19
  • 修回日期:  2020-05-27
  • 网络出版日期:  2020-06-03
  • 刊出日期:  2020-06-03

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