地下互通区超宽超深基坑施工技术工程研究  

Construction Technology of Ultra-Wide and Deep Foundation Pit in Underground Interchange Area

作　　者：杜伟 DU Wei(China Railway No.4 Engineering Group Co.,Ltd.,Hefei Anhui 230023,China;China Railway Urban Rail Transit Research and Development Center,Hefei Anhui 230023,China;Engineering Technology Institute of China Railway No.4 Engineering Group,Hefei Anhui 230023,China)

机构地区：[1]中铁四局集团有限公司,安徽合肥230023 [2]中国中铁城市轨道交通专业研发中心,安徽合肥230023 [3]中铁四局集团工程技术研究院,安徽合肥230023

出　　处：《工程质量》2024年第S02期6-11,共6页Construction Quality

基　　金：中国中铁股份有限公司科技研究开发计划(2023-专项-10)。

摘　　要：依托长江漫滩地区某穿越特厚暗浜区的地下互通隧道工程,深大异形基坑、地质条件差、基坑变形控制难、安全风险压力大,是这类工程施工管理的重点与难点。为解决以上问题,通过采取分期分段优化工序、坑中坑顺作法、槽壁加固、地连墙接缝处理、MJS隔离保护等措施,辅以基坑内支撑轴力补偿系统、三维可视化基坑监测系统等关键技术,临近文保历史建筑和既有隧道进行超深超宽基坑开挖施工,结果表明:采取以上针对性的关键措施,可有效确保粉砂地层深大弧形基坑施工满足安全质量要求,对类似工程的设计和施工有借鉴意义。This article is based on the construction project of an underground interchange tunnel that passes through a thick and dark area in the Yangtze River floodplain region.The deep and irregular foundation pit,poor geological conditions,difficult deformation control of the foundation pit,and high safety risk pressure are the key and difficult points of construction management for such projects.To solve the above problems,measures such as phased and segmented optimization of processes,pit in pit alignment method,groove wall reinforcement,ground wall joint treatment,MJS isolation protection,etc.were taken,supplemented by key technologies such as the support axial force compensation system in the foundation pit and the 3D visualization foundation pit monitoring system.The excavation construction of ultra-deep and ultra-wide foundation pits near historical buildings and existing tunnels was carried out.The results showed that the targeted key measures effectively ensured that the safety and quality of the construction of deep arc-shaped foundation pits in silt formations met the requirements,which has reference significance for the design and construction of similar projects.

关 键 词：弧形深基坑 围护结构 变形控制 MJS 施工组织 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]