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大埋深盾构隧道下穿施工对既有铁路的影响分析

吴石松 于淼 卢永刚

吴石松, 于淼, 卢永刚. 大埋深盾构隧道下穿施工对既有铁路的影响分析[J]. 岩土工程技术, 2025, 39(5): 688-692. doi: 10.20265/j.cnki.issn.1007-2993.2024-0210
引用本文: 吴石松, 于淼, 卢永刚. 大埋深盾构隧道下穿施工对既有铁路的影响分析[J]. 岩土工程技术, 2025, 39(5): 688-692. doi: 10.20265/j.cnki.issn.1007-2993.2024-0210
Wu Shisong, Yu Miao, Lu Yonggang. Influence of deep-buried shield tunneling construction undercrossing existing railways[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(5): 688-692. doi: 10.20265/j.cnki.issn.1007-2993.2024-0210
Citation: Wu Shisong, Yu Miao, Lu Yonggang. Influence of deep-buried shield tunneling construction undercrossing existing railways[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(5): 688-692. doi: 10.20265/j.cnki.issn.1007-2993.2024-0210

大埋深盾构隧道下穿施工对既有铁路的影响分析

doi: 10.20265/j.cnki.issn.1007-2993.2024-0210
详细信息
    作者简介:

    吴石松,男,1981年生,大学本科,高级工程师,主要从事岩土工程监测及相关研究工作。E-mail:25018678@qq.com

    通讯作者:

    于 淼,女,1989年生,工学博士,高级工程师,主要从事岩土工程勘察设计及相关研究工作。E-mail:yumiao_cc@163.com

  • 中图分类号: U455

Influence of deep-buried shield tunneling construction undercrossing existing railways

  • 摘要: 城市综合交通建设进程中,新建公路或地铁线路盾构隧道下穿既有铁路的交叉工程日益增多。以往研究采用数值模拟和现场监测等手段分析了盾构对铁路变形的影响规律,盾构隧道埋深一般不超过20 m。由于隧道施工时空效应,超过20 m埋深隧道下穿施工对铁路变形特征的影响尚不清晰。以武汉市某公路盾构隧道下穿京广铁路为例,采用自动化监测手段,分析了大埋深盾构隧道下穿施工对既有铁路轨道及路基沉降、接触网倾斜的影响规律。研究发现,针对大埋深盾构隧道下穿施工,铁路路基变形、轨道变形及接触网变形具有一定的滞后性。铁路轨道和路基沉降槽呈V型或U型,影响宽度约为75 m,明显大于普通浅埋盾构隧道。研究成果可为此类深埋盾构下穿工程施工提供数据支撑和参考。

     

  • 图  1  盾构隧道典型剖面图(单位:m)

    图  2  盾构隧道与铁路平面关系及监测点布置

    图  3  不同阶段铁路轨道累计沉降曲线

    图  4  不同阶段铁路路基累计沉降曲线

    图  5  不同区域铁路路基沉降时程曲线

    图  6  不同区域铁路接触网倾斜时程曲线

    表  1  主要土层物理力学参数

    土层 重度
    /(kN∙m−3
    黏聚力
    /kPa
    内摩擦角
    /(°)
    压缩模量
    /MPa
    (1-4)淤泥 18.6 4.7
    (4a)黏土夹碎石土 19.4 57 23 10.3
    (5-2-1)红黏土 18.7 46 19 15.1
    下载: 导出CSV

    表  2  主要岩体力学参数

    岩层承载力
    /kPa
    压缩模量/MPa
    (8a)中等风化灰岩2500
    (8)灰岩5000
    (9-1)中等风化泥质砂岩120046
    (9-2)石英砂岩6000
    下载: 导出CSV

    表  3  施工监测项目

    监测项目监测点数量/个
    路基竖向、水平位移监测30
    轨道竖向、水平位移监测30
    接触网立柱竖向位移、倾斜监测16
    下载: 导出CSV

    表  4  施工期既有铁路监测结果

    监测项目监测最大值所在点位出现时间(年-月-日)控制值
    轨道变形竖向位移/mm−1.97XXGD052022-09-13−8~+3
    顺铁路方向(Y)水平位移/mm1.44SXGD022022-09-14±7
    垂直铁路方向(X)水平位移/mm1.61SXGD042022-09-14±7
    路基变形竖向位移/mm−1.99XXLJ122022-09-14±10
    顺铁路方向(Y)水平位移/mm1.82SXLJ012022-09-14±7
    垂直铁路方向(X)水平位移/mm−2.34XXLJ102022-09-14±7
    接触网变形竖向位移/mm−1.3JCW1082022-09-14±5
    顺铁路方向(Y)倾斜/%0.16JCW1082022-09-140.5
    垂直铁路方向(X)倾斜/%−0.21JCW1082022-09-140.5
    下载: 导出CSV
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出版历程
  • 收稿日期:  2024-05-16
  • 修回日期:  2024-11-15
  • 录用日期:  2025-01-02
  • 刊出日期:  2025-10-10

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