沿海地区深厚淤泥质地层地铁深基坑设计  

Design of Deep Foundation Pit for Subway in Deep Layer of Mucky Soil in Coastal Area

作　　者：龚玲峰 GONG Lingfeng(CCECC Fuzhou Survey&Design Institute Co.Ltd.,Fuzhou Fujian 350000,China)

机构地区：[1]中土集团福州勘察设计研究院有限公司,福建福州350000

出　　处：《铁道建筑技术》2022年第5期69-71,103,共4页Railway Construction Technology

基　　金：中土集团福州勘察设计研究院有限公司科研立项课题(2020-KY-08)。

摘　　要：随着城市轨道交通的迅猛发展,地铁深基坑的设计越趋复杂,尤其是对深厚软土地层的深基坑设计要求更高。结合福州市地铁车站项目,针对其位于深厚淤泥质地层的特点,分析了该车站基坑设计的重难点及所采取的设计措施。施工实践表明:采用“搅拌桩+地连墙+内支撑”的基坑围护结构方案,选取合理的开挖方式,对基坑槽壁、基底及周边环境进行加固等设计措施是成功的,可为今后类似淤泥质地层深基坑设计提供参考。With the rapid development of urban railway system,the design of deep foundation pit for subway is becoming more and more complex,especially for the foundation pit in deep soft soil layer.Combined with Fuzhou metro station project,according to its characteristics in deep layer of mucky soil,the key and difficult points of the station foundation pit design and the design measures taken shall be analyzed.The construction practice shows that the foundation pit retaining structure scheme of“mixing pile,underground diaphragm wall and internal support”,the selection of reasonable excavation method,and the design measures of strengthening the groove wall,base and surrounding environment of the foundation pit are successful,which can provide reference for the design of deep foundation pit in similar mucky soil layer in the future.

关 键 词：地铁 深基坑 淤泥质地层 深厚软土层 支护结构体系 

分 类 号：U231.1[交通运输工程—道路与铁道工程]