摘要
密切跟踪浏阳河隧道的仰拱施工状态,开展现场测试,基于大量的实测数据研究水下浅埋公路隧道施作仰拱产生的力学效应。研究结果表明：仰拱开挖使上拱部不同部位的围岩与初衬接触压力发生不同的变化,有的部位接触压力增大,而有的部位接触压力却减小;整个初衬层闭合能制约上拱部初衬拱顶沉降和水平收敛的发展;挖掉仰拱初衬上的临时填土会使型钢拱架在仰拱底的应力有较大增加;仰拱混凝土浇注完后,仰拱初衬背后的水压力呈增加之势;仰拱混凝土既分担了部分围岩荷载,又起到了安全储备的作用;仰拱混凝土终端与仰拱开挖面的距离取为25~35 m是合理的。
Tracking the invert construction states of the Liuyanghe tunnel closely,the field measurements were performed.Based on the massive measured data,the mechanical effect of the invert construction were analyzed for the shallow embedded underwater highway tunnel.The research result shows that（1） to the different parts of the upper-arch,the invert excavation causes increase or decrease of the local contact pressure between initial lining and surrounding rock;（2） the closure of the whole initial lining layer can restrict the development of the vault settlement and the horizontal convergence of the upper-arch initial lining;（3） the steel frame stress at the invert bottom increases remarkably after digging out the temporary fill on the initial lining;（4） the water pressure behind the initial lining of the invert is increased after concrete pouring;（5） the invert concrete can sharing the surrounding rock pressure,and can also be used as the safety reserve;（6） it is reasonable that the distance between the end of the invert concrete and the invert excavation face ranges from 25 m to 35 m.
出处
《公路交通科技》
CAS
CSCD
北大核心
2011年第6期113-121,共9页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(50308029)
中铁第四勘察设计院集团科技专项资助项目(2008TSK03-B-02)
关键词
隧道工程
力学效应
现场试验
仰拱
水下隧道
tunnel engineering
mechanical effect
field test
invert
underwater tunnel
