地铁?T?型换乘节点结构沉降影响因素分析

Analysis of influencing factors on settlement of T-type transfer node structure in rail transit

地铁换乘节点后建车站的施工不同于一般的车站施工,在考虑后建车站稳定性的同时,更应该保证既有车站结构、运行轨道的稳定与安全。以厦门地铁1号线、4号线T型换乘节点基坑工程为背景,对换乘节点沉降进行监测,分析换乘节点处基坑开挖的各个阶段对先建站点的影响。分析结果显示,节点的沉降与基坑施工过程直接相关,故应选择合理的开挖和支撑方式,做好前期降水工作,及时封底以减少对换乘节点沉降的影响。

The construction of the station built after the transfer node is different from the general station construction. Considering the stability of the station built after the transfer node, the stability and safety of the existing station structure and track should be guaranteed. Based on the foundation pit engineering of T-type transfer nodes of Xiamen line 1 and line 4, the settlement of transfer nodes is monitored, and the influence of different stages of foundation pit excavation at transfer nodes on preconstruction sites is analyzed. The analysis results show that the settlement of the node is directly related to the construction process of the foundation pit, so appropriate excavation and support methods should be chosen to do optimal pre-precipitation work and timely sealing the bottom to reduce the impact on the settlement of the transfer node.