邻近高铁且上跨地铁基坑抗浮设计分析

Analysis of Anti-Floating Design of Foundation Pit Which is Adjacent to High-speed Railway and Cross the Subway

上跨地铁基坑的抗浮设计是影响地铁安全的一个重要因素,邻近高铁基坑的围护设计是影响高铁运营安全的一个重要因素,兼顾两者的基坑围护抗浮设计是一项重要的技术问题。文中以厦门北公交枢纽站项目为背景,分析地铁上浮变形原因,并对比分析基坑降水及坑内主动加固的抗浮措施,通过midas有限元分析软件,模拟不同抗浮措施对地铁上浮变形的影响。模拟结果表明,采用基坑坑内降水,基坑外设全封闭止水帷幕,是控制地铁变形且确保邻近高铁安全的有效措施;实际施工变形情况表明,该设计方案安全、合理、可行,可为类似工程的设计提供参考。

The anti-float design of the foundation pit across the subway is an important factor affecting the subway safety,and the surrounding design of the foundation pit which is adjacent to High-speed Railway is an important factor affecting the operation safety of the high-speed railway.The anti-float design of the foundation pit is an important technical problem taking into account the two.Based on the project of Xiamen North Bus Hub Station,this paper analyzes the causes of subway floating deformation,and compares and analyzes the anti-floating measures of foundation pit deprecipitation and active reinforcement in the pit.midas finite element analysis software is used to simulate the influence of different anti-floating measures on subway floating deformation.The simulation results show that it is an effective measure to control subway deformation and ensure the safety of adjacent high-speed railway by using dewatering in the foundation pit and installing a fully closed water curtain around the foundation pit.The actual construction deformation shows that the design scheme is safe,reasonable and feasible,which can provide reference for similar engineering design.