大断面地下通道结构施工对既有下卧盾构隧道影响研究分析

Research on the Influence of Large Sectional Underground Passage Structure Construction on the Existing Underground Shield Tunnel

针对软土地区实际工程设计,采用整体有限元方法,研究了大断面开挖地下通道结构基坑对既有近距离盾构隧道的影响问题。考虑了设置分隔墙、抗拔桩长度、封堵墙深度对基坑开挖产生的隧道最大隆起的影响,并根据现场实际情况和结构特点,分析了对应的施工控制措施。从实际工程设计的角度提出了针对大面积基坑开挖对下卧盾构隧道影响问题的分析研究方法和一系列保护地铁的措施,以期对相关工程问题有一定借鉴意义。

In view of the practical engineering design in soft soil area, in this paper the influence of the excavation of large section excavation of the underground passage structure on the existing tunnel is studied. Considering the influence of the separation wall, the length of the uplift pile and the depth of the blocking wall on the maximum uplift of the excavation of the foundation pit, and according to the actual situation and the structural characteristics, the corresponding construction control measures are analyzed. In according with the actual engineering design, analysis method and a series of measures to protect the subway is proposed for the large area excavation on underlying shield tunnel effect problem which have certain reference significance for engineering related issues.