地铁T型换乘站建设对既有地铁结构的影响分析

Analysis on the Influence of the Construction of Subway T-type Transfer Station on the Existing Subway Structure

以广州某地铁T型换乘站为例,研究分析换乘站建设施工对既有地铁结构的影响。分析结果表明:换乘站建设过程中对既有车站的竖向变形影响较大,最大值为5.47 mm,对区间隧道影响较小;换乘节点两侧基坑对称开挖比非对称开挖对既有地铁结构变形控制更有利;既有地下连续墙有利于既有地铁结构变形的控制,切除后既有线结构变形增大。分析成果可为类似工程的设计与施工提供参考。

Taking a T-shaped subway transfer station in Guangzhou as an example,studies and analyzes the impact of the construction of the transfer station on the existing subway structure.The analysis results show that the construction of transfer station has a great impact on the vertical deformation of the existing station,the maximum value is 5.47 mm,and has little impact on the interval tunnel.The symmetrical excavation of the foundation pit on both sides of the transfer node is more beneficial to the deformation control of the existing subway structure than the asymmetric excavation.The existing diaphragm wall is conducive to the control of the deformation of the existing subway structure,and the deformation of the existing line structure increases after removal.The analysis results can provide reference for the design and construction of similar projects.