地铁盾构隧道下穿铁路群设计方案研究

Research on Design Scheme of Subway Shield Tunnel Undercrossing Railway Group

近年来,随着地下空间的进一步开发,全国各地轨道交通的大规模发展,轨道交通施工的外部环境越来越复杂,盾构隧道下穿既有铁路线路的现象愈发常见。盾构施工可能引起地面沉降和变形,铁路尤其是高速铁路运行对铁路路基有较为严苛的要求~([1])。在盾构隧道下穿铁路施工时,如何保证铁路运行安全成为一个值得研究的重要课题。本文以天津地铁某区间下穿铁路群为实例,进行下穿铁路专项设计研究,提出盾构下穿铁路的相关保护措施。

In recent years,with the further development of underground space and the large-scale development of subways across the country,the external environment of rail transit engineering construction has become increasingly complex.The phenomenon of shield tunnels crossing existing railway lines is becoming increasingly common.Due to the high risk of ground settlement and deformation caused by shield tunneling,the operation of railways,especially high-speed railways,has strict requirements for railway embankments.How to ensure the safety of railway operation during shield tunneling has become an important research topic.This article takes a railway group under a certain section of Tianjin Metro as an example to conduct special design research and propose relevant protection measures for shield tunneling under railways.