摘要
城市公路隧道一般具有埋深较浅和周围建(构)筑物密集2个主要特点。以南京市九华山隧道施工为例,详细介绍复杂地质条件下城市公路浅埋大跨双连拱隧道施工过程中变形现场监控的项目、方法及手段,对隧道各施工阶段的变形进行监测与分析,并提出控制大变形的工程措施。结果表明:(1)隧道支护结构的变形和稳定时间与所处的地质条件有很大关系,围岩越差,变形越大,稳定时间也越长。(2)软弱地层中,变形存在滞后效应,且变形时间效应比空间效应明显。(3)封闭支护结构是改善结构受力和抑制隧道变形的有效途径,应尽早施作仰拱和形成封闭环。研究成果可为日后类似工程的设计、施工和研究提供有益的借鉴和参考。
The shallow-embedded depth and dense surrounding buildings are two main characteristics of urban road tunnel.Taking the construction of Jiuhuashan Tunnel in Nanjing for example,the contents,technique and method of deformation monitoring of urban shallow-buried large-span double-arch tunnel under complex geologic condition are described in detail.The deformation of tunnel during different construction stages is monitored and analyzed;and the engineering measures to control deformation are put forward.The result shows that（1） the deformation and stability time of tunnel are closely related with the geologic conditions,and increase with the surrounding rock becoming worse.（2） the deformation of the soft ground has lagging effect;and the time effect of the deformation is more prominent than the spatial effect of the deformation.（3） the enclosure of the lining is an effective method to improve the performance of lining and to restrain the deformation of tunnel;and it′s important to construct the inverted arch and to close the lining.The experience and conclusions presented can provide reference to design,construction and research of similar tunnel.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2007年第4期833-839,共7页
Chinese Journal of Rock Mechanics and Engineering
关键词
隧道工程
浅埋大跨双连拱隧道
现场监测
变形控制
tunnelling engineering
shallow-buried large-span double-arch tunneli
n-situ monitoring
deformation contr ol
