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强震区隧道软弱围岩洞口段桩-筏抗震措施的作用效果分析

崔光耀 李鹏宇 王庆建

崔光耀, 李鹏宇, 王庆建. 强震区隧道软弱围岩洞口段桩-筏抗震措施的作用效果分析[J]. 中国地质灾害与防治学报, 2021, 32(4): 106-112. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-14
引用本文: 崔光耀, 李鹏宇, 王庆建. 强震区隧道软弱围岩洞口段桩-筏抗震措施的作用效果分析[J]. 中国地质灾害与防治学报, 2021, 32(4): 106-112. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-14
Guangyao CUI, Pengyu LI, Qingjian WANG. Analysis on the effect of pile-raft anti-seismic measures for the tunnel section of weak surrounding rock in strong earthquake area[J]. The Chinese Journal of Geological Hazard and Control, 2021, 32(4): 106-112. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-14
Citation: Guangyao CUI, Pengyu LI, Qingjian WANG. Analysis on the effect of pile-raft anti-seismic measures for the tunnel section of weak surrounding rock in strong earthquake area[J]. The Chinese Journal of Geological Hazard and Control, 2021, 32(4): 106-112. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-14

强震区隧道软弱围岩洞口段桩-筏抗震措施的作用效果分析

doi: 10.16031/j.cnki.issn.1003-8035.2021.04-14
基金项目: 国家自然科学基金项目(51408008);北京市青年拔尖人才培育计划项目(CIT&TCD201704013);北京市属高校基本科研业务费项目(110052971921/061)
详细信息
    作者简介:

    崔光耀(1983-),男,山东莒南人,博士,副教授,主要从事隧道与地下工程的教学与研究。E-mail:cyao456@163.com

  • 中图分类号: P694

Analysis on the effect of pile-raft anti-seismic measures for the tunnel section of weak surrounding rock in strong earthquake area

  • 摘要: 为进一步提高地震时软弱围岩铁路隧道安全性及稳定性,以玉磨铁路新平隧道工程作为依托,利用FLAC3D数值模拟软件,对强震区隧道软弱围岩洞口段桩-筏抗震措施效果进行研究,对比分析了无加固措施、措施一(桩-拱结构)及措施二(桩-筏-拱结构)二衬的结构位移及内力,研究结果表明:措施一和措施二的竖向位移分别减小了1.35%、1.09%;措施一的边墙收敛几无变化(增大了0.44%);由于桩-筏-拱结构的整体稳定性较好,措施二的边墙收敛减小了30.49%;距离洞口最近的两个危险截面1和2处,措施一的最小安全系数提高了1.43%、6.71%,措施二的最小安全系数提高了145.91%、143.72%;综合位移及内力分析,措施二的抗震效果优于措施一,建议新平隧道洞口段采用桩-筏-拱结构进行抗震加固。
  • 图  1  计算模型

    Figure  1.  Calculation model

    图  2  加固措施

    Figure  2.  Reinforcement measures

    图  3  加速度时程曲线

    Figure  3.  Acceleration time history curve

    图  4  断面布置

    Figure  4.  Arrangement of section

    图  5  测点布置

    Figure  5.  Arrangement of measuring points

    图  6  二衬结构断面最小安全系数图

    Figure  6.  The minimum safety factor diagram of the second lining structure section

    图  7  加固措施范围

    Figure  7.  Scope of reinforcement measures

    图  8  二衬结构竖向位移云图

    Figure  8.  Cloud map of vertical displacement of second lining structure

    图  9  二衬结构横向位移云图

    Figure  9.  Cloud map of lateral displacement of second lining structure

    图  10  边墙收敛值

    Figure  10.  Side wall convergence value

    图  11  各监测断面内力

    Figure  11.  Internal force at each monitoring section

    表  1  计算工况

    Table  1.   Calculation conditions

    工况类型加固措施
    无措施无加固措施
    措施一桩-拱结构
    措施二桩-筏-拱结构
    下载: 导出CSV

    表  2  材料物理力学参数

    Table  2.   Physical and mechanical parameters of the materials

    材料属性重度/(kN·m−3泊松比弹性摸量/GPa内摩擦角/(°)黏聚力/MPa
    Ⅴ级围岩190.42.0240.2
    Ⅳ级围岩210.35.0360.5
    Ⅱ级围岩250.220511.5
    初支230.220
    二衬240.227
    加固圈230.357
    250.228
    筏板250.228
    下载: 导出CSV

    表  3  二衬结构的最大位移及控制效果

    Table  3.   Maximum displacement and control effect of second liner structure

    位移无措施/mm措施一/mm抗震效果/%措施二/mm抗震效果/%
    竖向11.8411.681.3511.711.09
    横向21.5423.41−8.6923.62−9.66
    下载: 导出CSV

    表  4  最大边墙收敛及抗震效果

    Table  4.   Maximum side convergence value and anti-seismic effect

    工况边墙收敛最大值/mm抗震效果/%
    无措施49.66
    措施一49.88−0.44
    措施二34.5230.49
    下载: 导出CSV

    表  5  监测断面最小安全系数及抗震效果

    Table  5.   Monitoring section minimum safety factor and anti-seismic effect

    监测断面无措施措施一抗震效果/%措施二抗震效果/%
    10.9780.9921.43 (↑)2.405145.91 (↑)
    21.0431.1136.71 (↑)2.542143.72 (↑)
    32.1162.92138.04 (↑)2.63724.62 (↑)
    42.1944.64111.49 (↑)5.165135.41 (↑)
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-07-07
  • 修回日期:  2020-07-31
  • 网络出版日期:  2021-10-11
  • 刊出日期:  2021-08-25

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