浅析运营地铁区间上方基坑工程的施工时序影响

Analysis on the Influence of Construction Sequence of Foundation Pit Engineering of Upper Metro Section

轨道交通工程对沉降变形要求非常严格,与其临近的工程施工特别是与之交叉的、相邻地铁运营隧道必然会产生附加力和变形,为降低外部影响,须制定恰当合理的施工方式以满足轨道交通变形要求。本文以位于南京运营的地铁区间隧道正上方的市政排水箱涵基坑工程为研究对象,采用MADIS有限元软件,基于空间效应影响,将基坑工程分为A区、B区、C区3个分区。为确定A区、B区、C区合理的施工顺序及组合,分析了6种不同施工工况下对地铁隧道结构变形的影响,并得出合理的施工顺序指导施工,为类似上穿轨道交通区间的地下工程设计、施工提供有益参考。

The requirements of the settlement deformation are very strict in the rail transit project,the engineering construction close to it,especially the metro operation tunnel intersect it will inevitably produce additional force and deformation,in order to reduce the external impact,it is necessary to formulate appropriate and reasonable construction measures to meet the deformation requirements of rail transit.This paper take the foundation pit engineering of municipal drainage box culvert which above the Nanjing metro tunnel as the example,and uses MADIS finite element software to divide the foundation pit engineering into three zones for A,B,C base on the influence of spatial effect.For ensuring the rational construction order and combination of A,B,C,it analyses the influence of structural deformation of metro tunnel in six different construction conditions to get the rational order for conducting construction and providing a useful reference for the design and construction of underground projects of upper crossing the rail transit.