大断面多顶管建设时序对桥梁桩基的影响分析
Influence Analysis of Construction Sequence of Large Section&Multi-Pipe Jacking on Bridge Pile Foundation
朱朱1
作者信息
- 1. 上海隧道工程有限公司,上海 200032
- 折叠
摘要
近年来,大断面多顶管已成为建造轨道交通车站的 1 种新兴工法.多顶管工程在不同建设时序下对桥梁桩基等周边环境的扰动影响不容忽视,然而,目前相关的工程案例研究较少.文章以上海轨道交通L14 静安寺站顶管工程为背景,借助数值软件,建立多顶管施工对既有桥梁桩基影响的模型,分析不同建设时序对桥梁桩基和地表沉降的影响程度.通过综合分析和归纳发现:先施工深层顶管后施工浅层顶管,有利于控制地层变形对周边环境的影响;先施工距离桩基稍远的顶管,其结构遮拦作用能有效减弱后续顶管施工对环境的扰动影响;顶管施工对近距离桩基的首次影响往往较为显著,先施工结构遮拦效果的体现程度和首次顶管与较近桩基的距离有关.
Abstract
In recent years,large cross-section multi-pipe jacking has become a new construction method for the construction of rail transit stations.The impact of multi-pipe jacking project on the surrounding environment such as bridge pile foundation cannot be ignored under different construction sequences.However,there are few relevant engineering case studies at present.Taking the pipe jacking project of Shanghai Rail Transit L14 Jing'an Temple Station as the background,with the help of numerical software,this paper establishes the model of the impact of multi-pipe jacking construction on the existing bridge pile foundation,and analyzes the impact of different construction sequences on the bridge pile foundation and surface settlement.Through comprehensive analysis and induction,it is found that deep pipe jacking followed by shallow pipe jacking is conducive to controlling the impact of ground deformation on the surrounding environment.Firstly,the pipe jacking which is a little far away from the pile foundation can effectively reduce the disturbance effect of subsequent pipe jacking construction on the environment.The first impact of pipe jacking construction on the close pile foundation is often significant,and the embodiment degree of the shielding effect of the first construction structure is related to the distance between the first pipe jacking and the close pile foundation.
关键词
大断面/矩形顶管/建设时序/桥梁桩基Key words
large section/rectangular pipe jacking/construction sequence/bridge pile foundation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据