摘要
为了研究隧道施工对邻近群桩的影响,本文利用ABAQUS有限元软件建立了盾构隧道下穿既有群桩模型。通过对比隧道开挖过程中地面沉降、群桩位移以及隧道拱顶沉降分析盾构隧道开挖对既有群桩位移的影响。结果表明:隧道拱顶与群桩桩端的最佳净距为5 m。隧道开挖对长桩影响较大,其中最短桩与最长桩桩端沉降相差22%;盾构隧道开挖会导致邻近群桩产生水平位移,桩轴线到隧道中轴线距离越大桩体水平位移越大。桩体位移增量受桩长以及桩轴线到隧道中轴线的距离影响较大,桩长越长,桩轴线到隧道中轴线距离越大,位移增量越小。本文研究可为既有桩基临近盾构隧道开挖工程的设计与施工提供理论指导。
To study the influence of tunnel construction on adjacent pile groups,a model of a shield tunnel passing through existing pile groups was established using ABAQUS finite element software.The impact of shield tunnel excavation on the displacement of existing pile groups was analyzed by comparing ground settlement,pile group displacement,and tunnel arch settlement during excavation.The results show that the optimal clear distance between the tunnel arch and the ends of the piles is 5 m.Tunnel excavation has a significant impact on long piles,with a settlement difference of 22%between the shortest and longest piles.The excavation of a shield tunnel results in horizontal displacement of the pile group.The greater the distance between the pile axis and the tunnel axis,the larger the horizontal displacement of the pile.The increase in pile displacement is significantly influenced by both the pile length and the distance between the pile axis and the central axis of the tunnel.Specifically,longer pile lengths and greater distances between the pile axis and the tunnel central axis correspond to smaller increments in displacement.This research provides theoretical guidance for the design and construction of adjacent shield tunnel excavations in the vicinity of existing pile foundations.
作者
庄妍
宋相伟
樊虎
ZHUANG Yan;SONG Xiangwei;FAN Hu(College of Civil Architecture and Environment,Hubei University of Technology,Wuhan 430068,China;School of Civil Engineering,Southeast University,Nanjing 211189,China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2024年第11期2202-2209,共8页
Journal of Harbin Engineering University
基金
国家自然科学基金优秀青年科学基金项目(51922029)
国家自然科学基金面上项目(52178316).
关键词
盾构施工
群桩基础
数值模拟
位移影响
隧道开挖
不规律排列
最优净距
位移增量
shield construction
pile group foundation
numerical simulation
displacement effect
excavation of the tunnel
irregular arrangement
optimal interval
displacement increment