摘要
为探究综合交叉换乘车站群大型基坑单侧开挖对既有车站变形响应影响特征,结合板壳理论、数值模拟和现场实测,基于锦城广场三车站换乘的强近接单侧基坑卸载引起变形和力学问题展开深入研究,主要得到以下研究成果:(1)强近接基坑开挖诱发既有车站结构向卸载一侧整体倾倒,其结构侧向变形随开挖深度增大呈指数增长,随开挖长度呈抛物线增长;(2)车站结构整体变形随附加荷载增大呈线性增大,且结构顶部变形受附加荷载影响较最大变形位置的敏感;(3)既有车站结构变形随土体重度增大呈线性增大,而随车站刚度降低呈指数增大;(4)基于Pearson相关性分析,开挖深度变化显著影响车站的侧向结构变形,其次为开挖长度,然后是附加荷载和既有车站刚度,土体重度的影响最不显著;(5)基于统计分析,位移最值点高度存在上下限,强近接单侧基坑开挖影响最危险区域为0.59H^0.73H位置,实际施工中宜重视该高度范围内围护结构的安全稳定性。
In order to explore the deformation response characteristics of large foundation pit excavation on one side of the comprehensive cross exchange station group,the deformation and mechanical problems caused by the unloading of one side foundation pit with strong proximity to the transfer of three stations in Jincheng square are studied based on the theory of plate and shell,numerical simulation and field measurement.The research results show that the excavation of the strong adjacent foundation pit induces the existing station structure to dump to the unloading side as a whole,and that the lateral deformation of the structure increases exponentially with increasing the excavation depth and parabolically with rising the excavation length.The overall deformation of the station structure increases linearly with increasing the additional load,and the deformation of the top of the structure is more sensitive to the additional load than the maximum deformation position.The deformation of the existing station structure increases linearly with increasing the soil mass density and exponentially with decreasing the station stiffness.Based on Pearson correlation analysis,the excavation depth has a significant impact on the lateral structural deformation of the station,followed by the excavation length,the additional load and the stiffness of the existing station,and the influence of the soil weight is the least significant.Based on the statistical analysis,there are upper and lower limits for the height of the displacement maximum point,and the most dangerous area affected by the excavation of single side foundation pit is 0.59 H-0.73 H.In the actual construction,attention should be paid to the safety and stability of the retaining structure within the height range.
作者
王志杰
周飞聪
周平
姜逸帆
邓树密
任刃
WANG Zhijie;ZHOU Feicong;ZHOU Ping;JIANG Yifan;DENG Shumi;REN Ren(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;Sinohydro Bureau 10 Co.,Ltd.,Chengdu,Sichuan 610072,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2020年第10期2131-2147,共17页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51678498)
中央高校基本科研业务专项资金资助项目(SWJTU11ZT33)
教育部创新团队发展计划资助项目(IRT0955)。
关键词
基坑工程
大型深基坑
交叉换乘中心
强近接施工
变形理论
力学模型
foundation pit engineering
large deep foundation pit
cross transfer center
strong close connection construction
deformation theory
mechanical model
