无锡火车站综合交通枢纽超大面积基坑工程设计与实践

Design and practice of the super-large deep excavation of the Wuxi Railway Station traffic hub

无锡火车站综合交通枢纽工程集高铁站、地铁、公交等众多功能于一身,其基坑工程规模大、开挖深度深、周边环境复杂、组成单体众多,而且各单体工期要求不一,部分单体工期要求极为紧迫。设计紧扣工程的特点,经过多种基坑支护设计方案的技术、经济和工期的综合对比分析,最终针对本工程量身定制,采用了"整坑围护,分阶段实施"的总体设计方案,并应用了以有限跨结构作为支撑、大直径旋喷可回收锚索、盖挖顺作等一系列新技术。该总体方案和一系列新技术的应用大幅度缩短了本工程关键区域的工期,对不同的环境条件实现了区别化的保护,并节省了工程造价,取得了良好的社会和经济效益。

The Wuxi Railway Station Traffic Hub is a complex building including a high-speed railway station,a metro station and bus stations. The excavation of this project is extremely large and the surrounding environment is quite complex. Moreover,some parts of the building have urgent time requirement. The foundation pit was divided into several parts and different retaining system was adopted for different parts. In addition,Some new techniques are applied such as Finite-span structure used as temporary support,Large-diameter retrievable anchor and cover and cut method. The design scheme and new techniques fulfilled the economy,time and environment protection requirements of the project.