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Application of Horizontal MJS Piles in Tunneling Beneath Existing Twin Tunnels

机译:水平MJS桩在既有双隧道下掘进中的应用。

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摘要

This paper presents a case of a single tunnel excavated beneath closely spaced existing twin tunnels with reinforced MJS piles in Changsha, China. Due to soil disturbance and stress re-distribution induced by tunneling, the safety of overlying tunnels during excavating becomes a serious issue. To solve this problem, the Metro Jet System (MJS) method was used. The response of stratum and overlying tunnels are studied during the installation of horizontal MJS piles and shield tunneling, by monitoring pore water pressure of surrounding stratum, additional stress and vertical displacement of tunnel in the water-rich sand layer. It indicates that the pore water pressure increased rapidly during the period of jetting-grout and the maximum excess pore water pressure reached 35 kPa. The distribution of additional stress at monitoring cross-section is studied in different construction stages. The vertical displacement of the two existing tunnels presents distinct characters due to temporary road load on the tunnels. A satisfactory match between the proposed fitting curves and the measured settlement data of north tunnel is presented. Overall, MJS horizontal pile can effectively reduce the settlement of existing tunnel.
机译:本文介绍了一个案例,该案例是在中国长沙近距离开挖的具有密实MJS桩的现有双隧道下方开挖的单个隧道。由于开挖引起的土壤扰动和应力再分布,开挖过程中上覆式隧道的安全性成为一个严重的问题。为了解决此问题,使用了Metro Jet System(MJS)方法。通过监测周围地层孔隙水压力,附加应力和富水砂层中隧道的竖向位移,研究了水平MJS桩和盾构隧道施工中地层和上覆隧道的响应。这表明在注浆期间,孔隙水压力迅速增加,最大过剩孔隙水压力达到35 kPa。在不同的施工阶段研究了监测断面处附加应力的分布。由于隧道上临时的道路荷载,两个现有隧道的垂直位移呈现出明显的特征。给出了拟议的拟合曲线与北隧道实测数据之间的满意匹配。总体而言,MJS水平桩可以有效减少现有隧道的沉降。

著录项

  • 来源
  • 会议地点 Changsha(CN)
  • 作者单位

    MOE Key Laboratory of Building Safety and Energy Efficiency, Hunan University, Changsha 410082, China,National Joint Research Center for Building Safety and Environment, Hunan University, Changsha 410082, China,College of Civil Engineering, Hunan University, Changsha 410082, China;

    MOE Key Laboratory of Building Safety and Energy Efficiency, Hunan University, Changsha 410082, China,National Joint Research Center for Building Safety and Environment, Hunan University, Changsha 410082, China,College of Civil Engineering, Hunan University, Changsha 410082, China;

    MOE Key Laboratory of Building Safety and Energy Efficiency, Hunan University, Changsha 410082, China,National Joint Research Center for Building Safety and Environment, Hunan University, Changsha 410082, China,College of Civil Engineering, Hunan University, Changsha 410082, China;

    Changsha Metro Group Co., Ltd., Changsha, China;

    MOE Key Laboratory of Building Safety and Energy Efficiency, Hunan University, Changsha 410082, China,National Joint Research Center for Building Safety and Environment, Hunan University, Changsha 410082, China,College of Civil Engineering, Hunan University, Changsha 410082, China;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    MJS; Shield tunnel; Field monitoring;

    机译:MJS;盾构隧道;现场监控;

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