摘要
随着地下暗挖隧道大规模建设,近接并行下穿既有铁路工程越来越多,施工风险也随之升高。新建隧道近接既有铁路施工会对周围土体产生扰动,引起地层损失及轨道路基沉降,因此研究暗挖隧道近接并行下穿既有铁路的安全性对于控制轨道变形、保证运营安全十分重要。本文基于某市政暗挖隧道近接既有铁路工程,结合工程特点确定铁路安全控制标准值,通过数值模拟分析隧道并行和下穿两种近接情况对既有铁路变形影响,并进行安全性研究。结果表明:新建暗挖隧道施工对既有铁路结构影响较小,变形满足相关安全控制标准,可为实际工程施工提供理论依据和有益指导。
With the large-scale construction of underground mined tunnels,the number of projects involving the approaching parallel crossing of existing railways is increasing,accompanied by elevated construction risks.The construction of new tunnels approaching existing railways can cause disturbances to the surrounding soil,leading to ground loss and track subgrade settlement.Therefore,studying the safety of mined tunnels approaching parallel down-traversing existing railways is crucial for controlling track deformation and ensuring operational safety.This paper is based on a municipal mined tunnel approaching existing railways project.Considering the engineering characteristics,railway safety control standards are determined.Then,through numerical simulation,the impact of two types of approaching situations(parallel and down-traversing)on existing railway deformation is analyzed,followed by a safety assessment.The results indicate that the construction of new mined tunnels has a minimal impact on the existing railway structure,with deformations meeting relevant safety control standards.This provides theoretical support and valuable guidance for practical engineering construction.
作者
李明耿
LI Minggeng(China Railway 18th Bureau Group Co.Ltd.,Tianjin 300222,China)
出处
《铁道建筑技术》
2024年第10期164-167,213,共5页
Railway Construction Technology
基金
中国国家铁路集团有限公司科技研究开发计划项目(2022A02480008)。
关键词
暗挖隧道
近接施工
并行下穿
既有铁路
安全性
数值分析
mined tunnel
approaching construction
parallel down-traversing
existing railway
security
numerical analysis
