复杂环境下大跨地铁风道结构建造方案研究  

A study on Construction Scheme of Large Span Subway Duct Structure under Complex Environment

作　　者：刘雪峰[1] 马宁[1] 宋少奇 胡少斌[1] 李增光[2] 

机构地区：[1]北京城乡建设集团有限责任公司,北京100079 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《铁道标准设计》2017年第2期73-77,共5页Railway Standard Design

基　　金：北京城乡建设集团有限责任公司科技研究开发计划项目(2015-01)

摘　　要：采用PBA工法建造的大跨地铁风道结构施工顺序主要有逆作法和顺作法两种方法。为克服传统PBA工法存在的问题,以北京地铁8号线三期工程大红门桥站-和义站区间附属大跨风道为背景,提出一种风道负1层和负2层分别顺作的施工方案,并采用三维数值模拟方法,对风道结构不同施工方案进行研究。针对风道拱部的中导洞开挖跨度大、地层沉降控制难度大的特点,提出一种联合支护结构。工程实践表明:负1层和负2层分别顺作的结构施工方案更有利于地层沉降控制及结构安全,联合支护结构有效控制了大跨中导洞开挖引发的地层沉降,确保周边环境安全和结构自身安全。The “ top-down” and “ down-top” methods are the two main construction methods used for subway duct structure. The subsidiary subway duct of Dahongmenqiao-Heyi interval tunnel of Beijing metro line 8 is taken as the research background to solve the existing problems involved in traditional PBA（ Pile-Beam-A rc ） construction method. A new construction method is proposed, which suggests that the first layer and the second layer of the subway duct are constructed with the “ down-top” method. The different construction methods ofsubway duct are analyzed with 3 -D numerical simulation. In view of the difficulties in controlling the strata subsidence and the characteristics of large-span excavation,a new combination supporting structure is proposed. The engineering practice indicates that the new construction method can effectively control the surface subsidence and the combination supporting structure can effectively control the strata subsidence resulted from the large-span middle pilot tunnel excavation.

关 键 词：地铁 大跨风道 PBA工法 结构施工方案 拱部中导洞 联合支护结构 

分 类 号：U231.3[交通运输工程—道路与铁道工程]