摘要
目的:近年来,城市轨道交通周边施工作业导致既有线路隧道结构受损或影响行车安全的事故频繁发生,因此需加强对城市轨道交通控制保护区内可能影响城市轨道交通结构设施安全和运营安全的各类施工作业行为的管理。方法:以贵阳市某新建地下过街通道近距离上跨贵阳轨道交通1号线和4号线施工项目为例,介绍了安全保护方案,确定了既有轨道交通结构变形控制标准;通过建立三维数值模型模拟施工工况,分析新建地下过街通道施工对既有轨道交通结构的变形和内力影响,并对既有轨道交通结构进行了安全保护专项监测。结果及结论:新建地下过街通道基础采用暗托梁+桩基结构,以及跳槽开挖反压施工措施对既有轨道交通结构进行保护;既有轨道交通结构变形的数值模拟结果与实际监测结果基本一致;在采取安全保护措施后,既有轨道交通结构变形值小于控制标准值;在城市轨道交通控制保护区施工作业安全管控中,采用精细化设计、现场施工控制及安全保护专项监测等措施能够保障既有轨道交通的结构及运营安全。
Objective:In recent years,URT(urban rail transit)surrounding constructions frequently cause damages to existing line tunnel structures or undermine operational safety,thus it is necessary to strengthen the management of various construction activities within the URT control and protection zone that may impact the safety of URT structures and operations.Method:Taking the construction project of a new underground passage close-distance over-spanning Guiyang Rail Transit Line 1 and Line 4 at close range in Guiyang City as example,a safety protection scheme is introduced and deformation control standards for existing rail transit structure are established.By establishing a three-dimensional numerical model to simulate construction working conditions,the deformation and internal force impacts of the new underground passage construction on existing rail transit structure are analyzed.Special monitoring for the safety protection of rail transit structure is conducted.Result&Conclusion:The foundation of the new underground passage adopts the′hidden beam+pile foundation′structure,and measures such as excavation with bracing and anti-thrust construction are taken to protect the existing rail transit structure.The numerical simulation results of existing rail transit structure deformation are consistent with the field-monitored results.After implementing safety protection measures,the deformation values of the existing rail transit structure are below control standards.In the safety management of construction work within URT control and protection zone,measures such as refined design,on-site construction control,and special monitoring for safety protection can ensure the structural and operational safety of existing rail transit system.
作者
黄松
HUANG Song(Guiyang Public Transportation Investment Operation Group Co.,Ltd.,550081,Guiyang,China)
出处
《城市轨道交通研究》
北大核心
2023年第9期100-104,109,共6页
Urban Mass Transit
基金
国家重点研发计划项目(2022YFC3003300)。
关键词
城市轨道交通
地下通道
超近距上跨
隧道结构施工
urban rail transit
underground passage
over-spanning in ultra-close proximity
tunnel structure construction
作者简介
黄松,高级工程师。
