广佛城际铁路小净距大直径盾构隧道后行线掘进对先行线管片的影响  

Influence of Later Tunnel Driving on Early Driven Tunnel Segmental Lining in Construction of Guangzhou-Foshan Intercity Railway Using Large Diameter Shield with Small Space Apart

作　　者：刘玮 杨安民[2] 傅金阳[2] 阳军生[2] 

机构地区：[1]广东华隧建设股份有限公司,广东广州510620 [2]中南大学土木工程学院,湖南长沙410075

出　　处：《铁道建筑》2016年第7期60-63,共4页Railway Engineering

基　　金：中国博士后科学基金(2015T80887);中南大学"创新驱动计划"(2015CXS015)

摘　　要：对广州至佛山城际铁路小净距大直径盾构双线隧道施工过程中管片的变位进行了现场监测与数据分析,探讨了后行线施工引起的先行线管片的变形特性。结果表明:先行线管片附加水平位移与自身变形随后行线盾构掘进都经历了"微量增加、明显增加、突变、回缩直至稳定"4个阶段,离后行线越近位移量越大;浅埋小净距条件下,对后行线施工扰动的敏感程度先行线管片上部区域比下部区域高;后行线盾构刀盘开挖阶段比拼装管片阶段对先行线管片的扰动作用大。The site monitoring and data analysis for segmental lining deflection of double line shield tunnel construction with small space apart and large diameter in G uangzhou- Foshan intercity railway were conducted and the deformation characteristics of early driven tunnel segmental lining caused by later driving tunnel construction.The results showed that the additional horizontal displacement and self-deformation of early driven tunnel segmental lining caused by later shield tunnel driving have experienced such four stages as fractionally increasing,markedly increasing,mutation,retraction and stabilization,the displacement is greater in the region close to the later driving tunnel,the upper region of early driven tunnel segmental lining was more sensitive than the lower region to the disturbance caused by the later driving tunnel construction,and the cutter head excavation of the later shield tunnel has a more disturbance effect on early driven tunnel segmental lining than segmental lining assembling.

关 键 词：小净距隧道 大直径盾构 先行线 管片 变位 实测分析 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]