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隧道建设（中英文） ›› 2019, Vol. 39 ›› Issue (5): 754-760.DOI: 10.3973/j.issn.2096-4498.2019.05.006

• 研究与探索 • 上一篇    下一篇

软土地区盾构施工对既有单桩工作性状的影响分区研究

路平1， 任斌斌2， 任兴月1，*， 张友良1   

  1. （1. 海南大学土木建筑工程学院， 海南 海口 570228； 2. 中国科学院大学， 北京 100049）
  • 收稿日期:2018-07-12 修回日期:2018-12-04 出版日期:2019-05-20 发布日期:2020-03-11
  • 作者简介:路平（1986—）， 男， 河北唐山人， 2015 年毕业于天津大学， 岩土工程专业， 博士， 讲师， 主要从事土力学与隧道工程的教学与科研工作。Email： luping_haikou@hainanu.edu.cn。*通信作者： 任兴月， Email： 992906@hainanu.edu.cn。
  • 基金资助:

    海南自然科学基金面上项目（20165188）； 海南大学科研启动基金项目（KYQD1565）

Influence Zone of Shield Tunneling on Behavior of Existing Single Pile in Soft Soil Area

LU Ping1, REN Binbin2, REN Xingyue1, *, ZHANG Youliang1   

  1. (1. College of Civil Engineering and Architecture of Hainan University, Haikou 570228, Hainan, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China)
  • Received:2018-07-12 Revised:2018-12-04 Online:2019-05-20 Published:2020-03-11

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摘要：

为研究既有桩基位于拟建隧道周围不同位置时，隧道开挖对桩基产生的受力与变形规律，依托天津地铁3号线北站至铁东路站左线盾构区间项目，利用ABAQUS软件将隧道周围软土按照桩端径向、切向位置的不同划分为8个区，建立考虑软土修正剑桥本构关系的二维有限元模型，探讨隧道开挖后桩基分别处于设计荷载和极限荷载下的桩侧摩阻力和桩身位移变化规律，并建立隧道开挖对邻近单桩工作性状的影响分区。计算结果表明： 1）隧道开挖会使桩基近隧道侧产生负摩阻力，负摩阻力最大值随桩到隧道径向距离的减小而逐渐增大，随桩长的增大而逐渐增大； 2）隧道开挖会导致桩身极限侧摩阻力降低，当桩端位于隧道两侧分区时降幅较大，在10%~15%； 3）桩端分别位于隧道两侧、底部、顶部分区时，依次对桩身倾斜率、桩身挠曲变形和桩顶沉降的影响最显著； 4）提出能够对隧道开挖后既有单桩工作性状分区进行评价的指标，当桩端位于3区时，盾构隧道开挖造成单桩的综合影响程度最大，应加强施工监控措施。

关键词: 软土, 盾构隧道, 单桩, 影响分区, 数值模拟

Abstract:

It is very important to study the stress and deformation law of pile foundation caused by tunnel excavation when the existing pile foundation is located in different positions around the tunnel. Firstly, the soft soil around the shield section project of left line of North StationTiedong Road Station on Tianjin Metro Line No. 3 is divided into 8 zones according to the radial and tangential positions of pile end by ABAQUS software. And then a twodimensional finite element model considering soft soil modified Cambridge constitutive relation is established to study the lateral friction resistance and displacement of pile body under design load and ultimate load after excavation of tunnel. Finally, the influence zone of tunnel excavation on the behavior of adjacent single pile is established. The results show that: (1) Tunnel excavation will cause negative friction resistance on the side near the tunnel of pile foundation; and the maximum negative friction resistance increases with the decrease of radial distance between pile and tunnel, and increases with the increase of pile length. (2) The excavation of the tunnel will lead to the reduction of the ultimate lateral friction resistance of the pile body; and when the pile end is located on both sides of the tunnel, the decrease amplitude is much higher, ranging from 10% to 15%. (3) When the pile end is located on both sides of the tunnel, the bottom and the top of the tunnel, the tunnel excavation mainly affects the inclination of the pile body, the deflection of the pile body and the settlement of the pile top. (4) The inddices that can evaluate the behavior of existing single pile after tunnel excavation are put forward; when the pile end is located in zone 3, the comprehensive influence of shield tunneling on single pile is the largest, and construction monitoring measures should be strengthened.

Key words: soft soil, shield tunnel, single pile, influence partitions, numerical simulation

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