长沙地铁3号线“先隧后站”区间风井甩项工程研究

Research on Interval Air Shaft Rejection Project under the Condition of"Tunnel Before Station"of Changsha Metro Line 3

在城市轨道交通工程建设过程中,受制于工期、用地协调等因素,常遇到“先隧后站”的情况,尤其是既有隧道已运营,需在隧道侧面和正上方施工甩项工程区间风井,存在较大的施工风险及运营风险,同时加大了设计的技术难度。文章对长沙轨道交通3号线月湘区间风井甩项工程进行研究,建立风井各施工阶段对既有隧道影响的有限元模型,计算分析各工况对既有隧道影响的数据,将设计方案优化调整,并提出施工方面建议,确保工程安全实施的同时节约了成本,为轨道交通类似项目提供了技术参考。

In the process of urban rail transit project construction,subject to factors such as construction period and land use coordination,the situation of"tunnel before station"is often encountered.In particular,the interval air shaft rejection project is needed to construct on the side and directly above the tunnel when the existing tunnel has already been in operation,there are great construction risks and operational risks,and the technical difficulty of the design is increased at the same time.This paper studies the rejection project of air shaft in Yuexiang section of Changsha Rail Transit Line 3,establishes the finite element model of the influence of each construction stage of the air shaft on the existing tunnel,calculates and analyzes the data of the influence of each working condition on the existing tunnel,optimizes and adjusts the design scheme,and puts forward some suggestions on construction,so as to ensure the safe implementation of the project while saving costs,and provide technical reference for similar rail transit projects.