盾构法修建正交下穿地铁隧道对上覆隧道的影响分析

英文篇名：Analysis of Influence of Undercrossing Subway Shield Tunneling Construction on the Overlying Tunnel
中文刊名：铁道学报
英文刊名：Journal of the China Railway Society
作者：方勇 ; 何川
英文作者：FANG Yong ; HE Chuan(Department of Tunnel and Underground Engineering ; Southwest Jiaotong University ; Chengdu 610031 ; China)
中文关键词：盾构法 ; 下穿隧道 ; 有限元分析 ; 横观各向同性
英文关键词：shield-driven method ; undercrossing tunnel ; FEM analysis ; transverse isotropy
出版日期：2007-04-15
机构：西南交通大学地下工程系,西南交通大学地下工程系四川成都610031,四川成都610031
年：2007
期：02
出版单位：铁道学报

摘要

在地铁工程中,常采用盾构法修建正交下穿隧道,新隧道的掘进不可避免地对既有隧道产生影响。采用三维有限元方法对正交下穿盾构隧道施工进行模拟,分析新隧道动态掘进时既有隧道位移、变形和内力的变化规律。模型中考虑了盾构机与管片衬砌的相互作用,以及管片衬砌结构的横观各向同性性质。计算结果表明,新隧道施工时既有隧道将产生不均匀沉降、不均匀侧移和扭转,且在对称面上出现最大值。对称面上管片的变形与受力出现先“加载”、后"卸载"、再“加载”的特点,同时该处的纵向弯矩不断增大,并在隧道底部产生较大拉应力。本文所研究的内容可为类似工程的施工提供参考。
Undercrossing tunnels are frequently constructed by the shield-driven method in metro projects.Shield tunneling affects the existing tunnel inevitably.By means of 3D-FEM,the process of undercrossing shield tunnel construction is simulated and the changing laws of displacement,deformation and internal forces of the existing tunnel are analyzed.The interaction between the shield and segments and transverse isotropic characteristics of the segment structure are taken into consideration in the model.The results show that there appear in the existing tunnel differential settlement,and nonuniform lateral displacement and torsion,and they reach their peak values on the plane of symmetry.On the symmetrical plane,the deformation and internal force of the segments experience a sequence of loading,unloading and reloading.At the same time,longitudinal moments grow up continuously in the same places and great tensile stresses appear at the bottom of the existing tunnel.This paper offers references for the construction of similar projects.

引文

[1]刘建航,侯学渊.盾构法隧道[M].北京:中国铁道出版社,1991:329-333.
    [2]于宁,朱合华.盾构隧道施工地表变形分析与三维有限元模拟[J].岩土力学,2002,25(8):1330-1334.YU Ning,ZHU He-hua.Analysis of Earth DeformationCaused by Shield Tunnel Construction and 3D-FEM Simu-lation[J].Rock and Soil Mechanics,2002,25(8):1330-1334.
    [3]王敏强,陈胜宏.盾构推进隧道结构三维非线性有限元仿真[J].岩石力学与工程学报,2002,21(2):228-232.WANG Min-qiang,CHEN Sheng-hong.3-DimentionalNon-linear Finite Element Simulation of Tunnel StructureFor Moving Forward Shield[J].Chinese Journal of RockMechanics and Engineering,2002,21(2):228-232.
    [4]日本土木学会.隧道标准规范(盾构篇)及解说[M].朱伟译.北京:中国建筑工业出版社,2001:68-72.
    [5]何川.シ-ルドトンネル縱断方向の地震?舉動に關すゐ研究[D].東京:早稻田大學專業理工學部,1999.
    [6]易宏伟.盾构法施工对土体扰动和地层移动影响的研究[D].上海:同济大学,1999.
    [7]张云,殷宗泽,徐永福.盾构法隧道引起的地表变形分析[J].岩石力学与工程学报,2002,21(3):388-392.ZHANG Yun,YING Zong-ze,XU Yong-fu.Analysis onThree Dimensional Ground Surface Deformations Due toShield Tunnel[J].Chinese Journal of Rock Mechanics andEngineering,2002,21(3):388-392.
    [8]张凤祥,朱合华,傅德明.盾构隧道[M].北京:人民交通出版社,2004:388-390.