浅埋暗挖大跨地铁风道施工技术

研究目的:本文主要介绍了浅埋暗挖大跨地铁风道工程施工方法选择、施工工序及施工要点,并通过对地层变位的监控量测,实现信息化施工.研究结论:(1)风道施工过程引起的地表沉降的规律,可以划分为五个阶段:零变形阶段、微小变形阶段、剧增变形阶段、缓慢变形阶段、基本稳定阶段；(2)开挖支护对引起地表沉降的影响可达到地表总沉降的76.6％～92.5％；(3)路面外载荷对地表沉降的影响也不容忽视,建议采用在路面铺设钢板的方法来缓冲和扩散荷载的作用.

Construction Technology for Shallow Surface Excavation Large-spanned Metro Air Duct

Research purposes: The introduction is given in this paper to the selections of the construction method and construction procedures as well as the key construction points for the shallow surface excavation large-span metro air duct.The informatization construction is realized by monitoring the displacement of the stratum. Research conclusions:(1) The pattern of the surface settlement caused by the construction of the air duct can be divided into five stages: zero deformation stage,micro deformation stage,aggravating deformation stage,slow deformation stage and basically stable stage.(2) The impact on the surface settlement caused by the excavation support is up to 76.6%~92.5% of the total surface settlement.(3) The impact on the surface settlement by the external load on theroad can not be neglected.It is proposed that the steel plate is paved on the road surface to buffer and diffuse the external load.