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    盾构超近距离侧穿铁路桥桩保护方案探讨

    任磊 朱颖 崔天麟

    任磊, 朱颖, 崔天麟, 2021. 盾构超近距离侧穿铁路桥桩保护方案探讨. 地球科学, 46(6): 2278-2286. doi: 10.3799/dqkx.2021.041
    引用本文: 任磊, 朱颖, 崔天麟, 2021. 盾构超近距离侧穿铁路桥桩保护方案探讨. 地球科学, 46(6): 2278-2286. doi: 10.3799/dqkx.2021.041
    Ren Lei, Zhu Ying, Cui Tianlin, 2021. Study on Protection Scheme of Shield Tunnel Passing through Railway Bridge Pile at a Short Distance. Earth Science, 46(6): 2278-2286. doi: 10.3799/dqkx.2021.041
    Citation: Ren Lei, Zhu Ying, Cui Tianlin, 2021. Study on Protection Scheme of Shield Tunnel Passing through Railway Bridge Pile at a Short Distance. Earth Science, 46(6): 2278-2286. doi: 10.3799/dqkx.2021.041

    盾构超近距离侧穿铁路桥桩保护方案探讨

    doi: 10.3799/dqkx.2021.041
    基金项目: 

    河南省交通运输厅项目 2020J5

    详细信息
      作者简介:

      任磊(1980-), 男, 高级工程师, 从事轨道交通建造及运营技术研究.ORCID: 0000-0003-3538-5580.E-mail: 616144259@qq.com

    • 中图分类号: P642

    Study on Protection Scheme of Shield Tunnel Passing through Railway Bridge Pile at a Short Distance

    • 摘要: 郑州地铁某盾构区间超近距离侧穿铁路桥梁桩基,受地面空间及隧道与桥桩间净距限制,无法采用隔离桩等常规保护措施.结合工程实际情况提出“盾构通过范围内土体注浆加固”、“桥梁承台加固”以及“注浆+承台加固”三种措施,利用数值模拟手段,对盾构侧穿施工期间,不同保护方案下桥桩的变形规律进行了分析研究.研究结果表明,采用“盾构通过范围内土体注浆加固+承台加固”措施,可使桥面最大沉降值减少约45%,且可减少桥面横桥向不均匀沉降及桥桩水平位移,在很大程度上减少盾构隧道施工对铁路桥梁的不利影响.

       

    • 图  1  陇海铁路现状

      Fig.  1.  Longhai railway status

      图  2  区间隧道与陇海铁路位置关系平面图(a)和剖面图(b)

      Fig.  2.  Plan (a) and section (b) of the positional relationship between the section tunnel and the Longhai railway

      图  3  袖阀管注浆加固平面图(a)和剖面图(b)

      Fig.  3.  Plan (a) and section (b) of grouting reinforcement for sleeve valve pipe

      图  4  承台南侧施做连梁平面示意

      Fig.  4.  Schematic diagram of the connecting beam construction on the south side of the cap

      图  5  承台南侧施做连梁剖面示意图

      Fig.  5.  Diagram of connecting beam section on the south side of the cap

      图  6  注浆加固+承台南侧施做连梁示意

      Fig.  6.  Schematic diagram of grouting reinforcement + connecting beam on the south side of the cap

      图  7  计算模型示意

      Fig.  7.  Schematic diagram of calculation model

      图  8  计算模型图

      Fig.  8.  Calculation model diagram

      图  9  桥面沉降位移曲线(a)和地面沉降位移曲线(b)

      Fig.  9.  Bridge deck settlement displacement curve (a) and ground settlement displacement curve (b)

      图  10  桥面横桥向沉降位移曲线(a)及沉降位移云图(b)

      Fig.  10.  Transverse bridge settlement displacement curve (a) and settlement displacement cloud map (b) of bridge deck

      图  11  桩体水平位移曲线(a)和水平位移云图(b)

      Fig.  11.  Horizontal displacement curve of pile (a) and horizontal displacement cloud map (b)

      表  1  土层计算参数

      Table  1.   Calculation parameters of soil

      地层岩性 容重(kN/m3) 压缩模量(MPa) 泊松比 摩擦角(°) 粘聚力(kPa)
      1-1杂填土 18 3 0.3 5 5
      2-33黏质粉土 17.6 9 0.32 22 13.5
      3-31黏质粉土 18.8 14.5 0.33 24 14
      3-41粉砂 20 16.5 0.4 28 3
      3-32黏质粉土 19.4 14.5 0.35 24.5 15
      3-22粉质黏土 19.3 9.9 0.25 17 28
      3-51细砂 20 22 0.4 32 -
      3-23粉质黏土 19.1 10.6 0.28 17.5 29
      3-21粉质黏土 19.1 6.2 0.25 16 26
      3-24粉质黏土 19.1 11 0.30 18 33
      注浆加固体 21 11 0.28 26 58
      下载: 导出CSV

      表  2  材料计算参数

      Table  2.   Calculation parameters of structure materials

      地层岩性 容重(kN/m3) 弹性模量(MPa) 泊松比 摩擦角(°) 粘聚力(kPa)
      盾构管片 25 35 500 0.2 - -
      桥梁桩基 25 34 500 0.2 - -
      承台与桥墩 25 32 000 0.2 - -
      铁轨 72 206 000 0.3
      下载: 导出CSV
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    出版历程
    • 收稿日期:  2021-01-02
    • 刊出日期:  2021-06-15

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