摘要
受南京火车站铁路站场制约,南京地铁一号线南京站分为南北两个明挖区和铁路站场下方过站区.过站区为双线隧道,隧道跨度大、埋深浅、线间距小,采用矿山法施工难度和风险极大.为配合施工,采用FLAC三维数值分析软件,按实际的开挖顺序和施工工艺,对过站区开挖过程进行了模拟.得出过站区隧道施工引起的地层沉降和塑性区分布,数值计算结果表明过站区施工方案是合理可行的,计算结论为地层加固范围提供了依据,对过站区隧道施工有指导作用.施工实践也证明了依据数值计算结果所采取的施工辅助措施对确保地表线路安全和隧道施工安全效果明显.
Constrained by Nanjing railway station, the Nanjing subway station is subdivided into the southern cutting part, the northern cutting part and the connecting tunnels part, which located just beneath a cluster of existing railway lines in the Nanjing railway station, The connecting tunnels constructed using mining method have a large span,a shallow coverage and a little distance between two lines. The construction process of connecting tunnels is simulated by using FLAC software. The stratum subsidence rule and the distribution of plastic region am discussed in detail. The calculation result indicates that the construction method of the connecting tunnels is reasonable,and it also has a guidance function on tunnels construction and the affirmance of stratum reinforcement region, The practice construction proeess verifies that the assistant reinforcement measures am effective for the safety of railway lines and tunnels.
出处
《北京交通大学学报》
EI
CAS
CSCD
北大核心
2007年第1期55-58,F0003,共5页
JOURNAL OF BEIJING JIAOTONG UNIVERSITY
基金
国家自然科学基金资助项目(95738160)
关键词
大断面隧道
下穿铁路站场
矿山法
三维数值模拟
large section tunnel
beneath a cluster of existing railway lines
mining method
three-di- mensional numerical simulation
