摘要
为评估航道开挖下穿高铁桥梁时加固方案的变形控制效果,结合京杭运河二通道下穿沪昆高铁工程实例,采用三维有限元软件模拟分析航道围护结构施工、航道开挖、航道结构浇筑、航道通航等各阶段土体和结构的位移变形,对下穿施工过程中航道维护结构及桥墩的安全状态进行量化评价。结果表明,坚实的支护系统、分层开挖结合多次降水,可以避免较大土体沉陷并控制开挖引发的坑底隆起;加固方案也对既有结构起到了良好的保护作用,保证列车在施工期安全运行。
To evaluate the deformation control effect of the reinforcement scheme for channel under-passing railway bridge during excavation,this paper takes the second channel of the Grand Canal under-passing the Shanghai-Kunming high-speed railway as an example.It carries out a three-dimensional finite element simulation to analyze the displacement deformation of the soil and structures at different stages,including the construction of enclosure structures,channel excavation,concreting of channel structures,and channel navigation.In addition,it conducts the quantitative evaluation on the safety of the enclosure structures and bridge piers during the construction.The results show that the solid support system and layered excavation combined with multiple dewatering can alleviate excessive settlement and bottom heave caused by excavation.The reinforcement scheme also protects the existing structures,ensuring the running safety of trains during the construction.
作者
孙阳
李怡玮
顾祯雪
余杰
郦纲
杨攀
SUN Yang;LI Yi-wei;GU Zhen-xue;YUJie;LI Gang;YANG Pan(College of Harbor,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China;Huai an Research Institute of Hohai University,Huai an 223001,China;Hangzhou Second Channel of Grand Canal Construction Investment Co.,Ltd.,Hangzhou 310020,China;China Railway No.17 Bureau Group Sixth Engineering Co.,Ltd.,Fuzhou 350014,China)
出处
《水运工程》
北大核心
2022年第5期91-97,133,共8页
Port & Waterway Engineering
基金
浙江省交通运输厅科技计划项目(2020014)
南通市科技项目(JC2021009)。
关键词
航道开挖
数值分析
围护结构
高铁桥墩
变形控制
channel excavation
numerical analysis
enclosure structure
high speed railway bridge pier
deformation control
