常州地区小半径盾构区间施工下穿建筑物的影响分析

Analysis of the Impact of Small Radius Shield Tunnel Construction on Underpassing Buildings in Changzhou Area

盾构区间施工在下穿建筑物的过程中,会引起建筑物的沉降与倾斜。文章以常州轨道交通2号线某小半径曲线的双线盾构区间下穿建筑物为背景,采用数值模拟方法研究了盾构下穿过程中的建筑物沉降特性。研究结果表明:在盾构下穿后,1~3号楼均发生了不同程度的沉降变形,其中1号楼在侧穿情况下受到的影响较小,2号、3号楼在正下穿情况下受到的影响较大,最大沉降4.79 mm。各建筑物的沉降与倾斜均满足控制要求。

During the construction process of tunneling through buildings,shield tunneling can cause settlement and tilting of buildings.This paper takes a small radius curve double track shield tunneling section of Changzhou Metro Line 2 as the background,and uses numerical simulation methods to study the settlement characteristics of buildings during the shield tunneling process.The research results indicate that after the shield tunneling,buildings 1 to 3 experienced varying degrees of settlement and deformation.Among them,building 1 was less affected in the case of lateral tunneling,while buildings 2 and 3 were more affected in the case of direct tunneling,with a maximum settlement of 4.79 mm.The settlement and inclination of each building meet the control requirements.