摘要
为了研究沉管基槽开挖对既有桥梁桥墩侧向位移的影响,确保基槽顺利开挖,以澳门嘉乐庇海底隧道为工程背景,通过模型试验方法对基槽开挖过程中桥墩产生的侧向变形进行研究。研究结果表明,在沉管基槽开挖过程中,基槽开挖中的较大跨径的桥墩侧向位移较大,桥墩的侧向位移随着开挖深度的增大而增大,突发恶劣天气下桥墩位移受影响较大。可见在施工期间应合理控制开挖的深度,减少因开挖深度增加而增加的桥墩侧向变形,并应确保测点布置的稳定牢固,减少环境因素直接对测点造成影响的可能,最后为确保基槽开挖的安全,应在开挖过程中对桥梁变形加强监控。
To understand the impact of the excavation of an immersed tube on the lateral displacement of existing bridge piers and ensure the smooth excavation of the foundation trench,the Jiadepi submarine tunnel in Macao was used as the engineering background,and its lateral deformation of piers during the excavation of foundation trench was studied for the model test.The results show that during the excavation of sinking pipe foundation,the lateral displacement of a larger span bridge pier in the excavation of foundation trench was obvious,and the lateral displacement of the pier increased with the increase of excavation depth.The displacement of the pier was greatly affected by a bad weather.It is suggested that the depth of excavation should be well controlled during the construction to reduce as much as possible the lateral deformation,and the measurement points should be well secured for stability to minimize the impact of environmental factors.At last,to ensure the safety of the foundation trench excavation,the bridge deformation during the excavation should be monitored carefully.
作者
谷任国
梁建勋
GU Ren-guo;LIANG Jian-xun(School of Civil Engineering and Transportation,State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510641,China)
出处
《科学技术与工程》
北大核心
2020年第1期340-347,共8页
Science Technology and Engineering
基金
亚热带建筑科学国家重点实验室自主研究项目(2017KB16)
关键词
基槽开挖
模型试验
侧向位移
开挖深度
trench excavation
model test
lateral displacement
excavation depth
