下沉广场开挖对下卧地铁联络线隧道的影响  

Analysis on rebound displacement of adjacent metro tunnels by the excavation for the underpass

作　　者：张明[1] 李晶晶[1] 赵玉如[1] 

机构地区：[1]河南工程学院土木工程学院,河南郑州451191

出　　处：《河南工程学院学报（自然科学版）》2016年第3期38-41,共4页Journal of Henan University of Engineering：Natural Science Edition

基　　金：河南省科技发展计划项目(122102310449)

摘　　要：随着地铁等地下设施的完善,地铁或地铁联络线上方大面积深基坑开挖问题出现,评价和预测基坑开挖对其下卧地铁隧道的影响成为亟待解决的问题.针对地铁联络线隧道下穿下沉广场等施工条件,结合下沉广场基坑开挖工程,采用Boussinesq解和Mindlin解计算广场开挖卸载产生的附加应力,用分层总和法计算下卧联络线隧道的回弹位移.计算结果表明,Boussinesq解和Mindlin解的计算结果相差不大,Boussinesq解更安全一些,计算地铁联络线隧道顶部、底部中心线处最大回弹位移分别为13.8 mm和3.5 mm,满足轨道竖向变形要求,联络线隧道轨顶面回弹位移计算值与实测值较为吻合,证实了该计算方法的合理性.With the improvement of underground facilities such as metro, the problems that large area deep foundation pit excava-tion above the metro and metro connecting line has appeared. It is an urgent problem to be solved for the evaluation and prediction some influences of foundation pit excavation construction on the underlying metro tunnel. Based on the sunken plaza excavation project, the construction condition of down-traversing the sunken plaza for metro connecting line tunnel was considered, and the additional stress caused by the sunken plaza excavation was calculated separately by Boussinesq and Mindlin solution method, and the rebound displacement of metro connecting line tunnel was calculated by the layer-wise summation method. The results are shown as follows ： the calculation results for Boussinesq and Mindlin solution method has a tiny discrepancy, and the results for Boussinesq solution method is on the secure side. The maximum rebound displacement of the centre line on the top and bottom of metro connecting line tunnel are respectively 13. 8 mm, 3.5 mm by Boussinesq solution method, which meet the requirements of vertical deformation for the urban track . The calculation results of rebound displacement are closely in compliance with the measured results on the top of connecting line tunnel, which confirms the rationality of the calculation methods.

关 键 词：地铁联络线 下沉广场 回弹位移 基坑 BOUSSINESQ解 MINDLIN解 

分 类 号：TU924[建筑科学—建筑设计及理论]