软土地区河道开挖对地铁隧道的影响分析及保护措施研究

Research on the Influence of River Channel Excavation on Subway Tunnel and Protective Measures in Shanghai

本文以上海地区某上穿地铁隧道河道工程开挖为例,针对在地铁区间隧道上方进行河道开挖时,提出了三种不同的保护措施方案,并采用有限元进行分析计算,对比采取不同保护措施时河道开挖对区间隧道的影响。分析结果表明当对隧道周围土体进行门式加固并在河道底板下设置灌注桩时,同时优化施工工序,可将河道开挖对区间隧道的附加影响降至最低,满足地铁保护条例的要求。本文相关研究成果对类似工程具有借鉴意义。

Taking the construction of a river excavation in Shanghai area over the subway tunnel as the study subject, three different kinds of protective solutions are put forward, and this paper use the finite element analysis to contrast the different influence of river excavation of running tunnel in the different protective solutions. Analysis results show that when the soil around the tunnel are reinforced as gate-type and the caisson piles are set under river bottom, and the construction process optimized, the additional effects of running tunnel due to river excavation can be reduced to the lowest to meet the requirements of subway protection ordinances, and to provide the basis for relevant protective measures applied in similar projects.