深基坑施工对紧邻地铁区间隧道结构影响分析

Analysis on Influence of Deep Pit Construction on Neighboring Metro Tunnel

随着城市地铁建设步伐的加快和高层建筑大量涌现,城市高层建筑施工中进行基坑开挖必然引起周围地层移动,从而造成临近地铁隧道纵向不均匀沉降,最终对地铁正常运营产生一定影响。本文结合广州地区的一个实际基坑工程,人工挖孔桩施工对紧邻地铁区间隧道的影响、深基坑施工对紧邻地铁区间隧道的影响、水位下降对区间隧道二衬结构受力和变形的影响三个方面进行了分析。研究结果表明在现有的设计方案下,基坑施工不会对地铁隧道的结构安全和地铁的正常运营造成影响。研究成果为基坑的设计、施工及地铁的正常使用提供了依据。

With the development of construction of the metro tunnel and emergence of high buildings in large numbers, the foundation pit excavation will no doubt induce the soil deformation and have result in uneven settlements of adjacent metro tunnels. The excessive settlements may induce the crack of tunnel segments and eventually may affect the safety of metro trains. According to a project in Guangzhou, an analysis was carried out on effect of construction of manual-excavated pile on metro tunnel, construction of deep pit on neighboring metro tunnel and influence of water level decrease on stress and deformation of metro tunnel. According to the results, based on the present design, the construction of deep pit will not influence the safety of metro tunnel and normal operating of metro trains. It may provide certain basis to design and construction of the deep pit and normal use of metro tunnel.