铁道科学与工程学报2017，Vol.14Issue(11)：2399-2406,8.
铁路隧道下穿连续刚构桥墩施工影响及防控措施研究
Research on the construction influence and protection of railway tunnel crossing beneath the pier of existing continuous rigid frame bridge
摘要
Abstract
Based on Yakou Tunnel under-passing Chengmendong Bridge, part of newly-built Miyi-Panzhihua railway, this paper systematically studied the interaction mechanisms of Yakou Tunnel's excavation on the upper slope and pier 4 on the right side, pier 5 on the left side of Chengmendong Bridge. Through data analysis of the site monitoring and numerical analysis, the reinforcement effects of frame beam with pre-stressed anchor-cable that was used in construction site were investigated. Finally, safety evaluation of Yakou Tunnel was conducted after tunneling was completed. The results showed that with the dynamic excavation of the Yakou Tunnel, safety factor of upper slope decreased clearly; meanwhile, settlement and transverse displacement occurred and its settlement is much larger than transverse displacement. After construction of frame beam with pre-stressed anchor-cable, safety factor of upper slope increased significantly, and the influence of the exaction of Yakou Tunnel on upper slope decreased clearly. The frame beam with pre-stressed anchor-cable has a better control over the transverse displacement than settlement.关键词
铁路隧道/预应力锚索框架梁/安全系数/近接施工/FLAC3DKey words
railway tunnel/frame beam with pre-stressed anchor-cable/safety factor/approaching construction/FLAC3D分类
交通工程引用本文复制引用
王国栋,王志杰,段明明,李昭..铁路隧道下穿连续刚构桥墩施工影响及防控措施研究[J].铁道科学与工程学报,2017,14(11):2399-2406,8.基金项目
国家自然科学基金资助项目(51678498) （51678498）
中央高校基本科研业务费专项资金资助项目(SWJTU11ZT33) （SWJTU11ZT33）
交通运输部西部科技资助项目(2013318J13340) （2013318J13340）
教育部创新团队发展计划资助项目(IRT0955) （IRT0955）
