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软土地区双线区间盾构隧道施工对周边地表以及建筑物沉降的影响

潘涛

潘涛. 软土地区双线区间盾构隧道施工对周边地表以及建筑物沉降的影响[J]. 水文地质工程地质. doi: 10.16030/j.cnki.issn.1000-3665.202106014
引用本文: 潘涛. 软土地区双线区间盾构隧道施工对周边地表以及建筑物沉降的影响[J]. 水文地质工程地质. doi: 10.16030/j.cnki.issn.1000-3665.202106014
PAN Tao. Influences of double-track shield tunnel construction on settlements of adjacent ground and buildings in a soft soil area[J]. Hydrogeology & Engineering Geology. doi: 10.16030/j.cnki.issn.1000-3665.202106014
Citation: PAN Tao. Influences of double-track shield tunnel construction on settlements of adjacent ground and buildings in a soft soil area[J]. Hydrogeology & Engineering Geology. doi: 10.16030/j.cnki.issn.1000-3665.202106014

软土地区双线区间盾构隧道施工对周边地表以及建筑物沉降的影响

doi: 10.16030/j.cnki.issn.1000-3665.202106014
详细信息
    作者简介:

    潘涛(1985-),男,高级工程师,主要从事地下工程施工技术的研究工作。E-mail: pantao_03@163.com

  • 中图分类号: TU433

Influences of double-track shield tunnel construction on settlements of adjacent ground and buildings in a soft soil area

  • 摘要: 研究盾构隧道施工对周围地面以及建筑物沉降造成的影响,是软土地区盾构隧道安全施工和正常运营的基础课题。为了分析宁波轨道交通5号线同德路站—石碶站区间双线盾构隧道施工对周边地表和建筑物的影响,本文在建立盾构隧道动态施工过程三维有限元模型的基础上,基于地表以及建筑物沉降数值模拟结果与现场监测值的对比,分析了隧道开挖对隧道周围地表沉降与建筑物沉降的影响。结果表明,掘进完成时,开挖方向沉降槽往上行线隧道方向偏移、呈现倒梯形形态,横断面影响区域为距离双线隧道轴线中心小于3倍隧道直径;上行线在下行线开挖后并不会增加地表沉降,但增大了沉降槽宽度;下行线到达前产生的沉降占最终累计沉降的67%;当盾构掘进面刚到达建筑物时、建筑物的倾斜方向与盾构掘进方向一致,当盾构掘进面离开建筑物时、建筑物将沿着盾构掘进的反方向倾斜;建筑物两侧沉降值较中部沉降值降低了83%;双线贯通后建筑物沉降呈“U”形分布,最大沉降量发生在远离隧道一侧距建筑物中心0.5 m处。
  • 图  1  研究区段的土层分布

    Figure  1.  Soil distributions in the study area

    图  2  三维隧道开挖模型

    Figure  2.  3D tunnel excavation model

    图  3  盾构开挖过程

    Figure  3.  Shield excavation process

    图  4  不同工况下的隧道竖向位移等值线图

    Figure  4.  Contour map of the tunnel vertical displacement under different working conditions

    图  5  隧道监测点布置图

    Figure  5.  Layout of the tunnel monitoring points

    图  6  地表沉降历时曲线

    Figure  6.  Duration curve of ground subsidence

    图  7  不同位置建筑物沉降历时曲线

    Figure  7.  Duration curve of building settlement

    图  8  临近隧道一侧建筑物各工况沉降

    Figure  8.  Settlements of building sides near the tunnel under various working conditions

    图  9  远离隧道一侧建筑物各工况沉降

    Figure  9.  Settlements of building sides far away from the tunnel under various working conditions

    图  10  不同位置下的建筑物沉降

    Figure  10.  Building settlement at various locations

    表  1  同-石区间隧道影响范围内的土层物理力学性质参数

    Table  1.   Physical and mechanical parameters of soil layers in the affected area of the Tong-Shi tunnel

    土层编号
    与名称
    密度/
    (g·cm-3)
    黏聚力/
    kPa
    内摩擦角/
    (°)
    弹性模量/
    MPa
    泊松
    ①1b素填土2.008.0015.008.00.33
    ①2黏土1.9420.9014.609.90.32
    ①3b淤泥质黏土1.7411.2011.2023.40.36
    ②2b淤泥质黏土1.7311.0410.479.00.38
    ⑤1a黏土1.9337.4114.3418.60.31
    ⑤1b粉质黏土1.9129.3013.4017.00.31
    ⑤1T砂质粉土1.933.0030.2040.00.24
    ⑤4a黏土1.8822.9011.4026.40.32
    ⑥1黏土1.9342.7014.3035.50.31
    ⑥4a粉砂2.023.5031.2034.40.30
    ⑦1黏土1.9437.6015.3731.50.32
    下载: 导出CSV

    表  2  同-石区间隧道材料参数

    Table  2.   Material parameters of the Tong-shi tunnel

    材料类型密度/(g·cm-3)弹性模量/MPa泊松比
    衬砌管片2.50345000.33
    注浆层1.8010.42
    盾壳7.852060000.22
    下载: 导出CSV

    表  3  计算工况

    Table  3.   Calculation conditions

    工况β盾构机到达监测点下行线盾构机工作进程
    --盾构机开始工作
    0.0JC11-12盾构到达建筑物边缘
    0.5JC11-7盾构到达建筑物中部
    1.0JC12-3盾构离开建筑物
    下载: 导出CSV
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  • 收稿日期:  2021-06-03
  • 修回日期:  2021-07-08
  • 网络出版日期:  2021-11-19

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