水资源与水工程学报2023，Vol.34Issue(6)：164-172,9.DOI:10.11705/j.issn.1672-643X.2023.06.20
外海大回淤沉管隧道沉降影响因素敏感性分析
Sensitivity analysis of settlement influencing factors of offshore large siltation immersed tunnel
摘要
Abstract
There are multiple factors influencing the foundation settlement of deep-sea immersed tunnels,and excessive settlement will directly affect the safety of the tunnel.Therefore,it is necessary to analyze the sensitivity of various construction deviations affecting the foundation settlement.Taking the foundation of the Hong Kong-Zhuhai-Macao immersed tunnel as the research object,the centrifugal model test supplemented by the finite element verification method was used to reveal the variation characteristics of the backfill recompression amount and the foundation stiffness,according to which the single factor sensi-tivity of the longitudinal settlement of the natural foundation of the Hong Kong-Zhuhai-Macao im-mersed tunnel was determined.The results show that the most influential factor of the settlement of im-mersed tunnel is the overbreak and underbreak deviation of foundation trench,and the least influential factor is the unilateral width deviation of foundation trench.When the overbreak and underbreak excava-tion deviation of foundation trench is present,its influencing degree on the foundation stiffness under the combined working condition can reach 50%,and when it reaches the limit value,its influencing degree on the settlement characteristics of the immersed tunnel is no less than 20%,no matter what other sensi-tive factors are combined.Based on the analyses of multiple combinations of sensitivity factors,it is found that the most unfavorable working condition distribution in the longitudinal section is the constant extreme value on both sides of the section,i.e.,the nonlinear variation distribution.The research results can provide some reference for other similar projects.关键词
外海沉管隧道/离心模型试验/有限元计算/地基沉降/沉降影响因素/敏感性分析Key words
offshore immersed tunnel/centrifugal model test/finite element calculation/foundation set-tlement/settlement influencing factor/sensitivity analysis分类
交通工程引用本文复制引用
岳夏冰,吴定意,王奕丁,江黎..外海大回淤沉管隧道沉降影响因素敏感性分析[J].水资源与水工程学报,2023,34(6):164-172,9.基金项目
陕西省自然科学基础研究计划项目(2020JQ-379) （2020JQ-379）
道路与铁道工程安全保障省部共建教育部重点实验室项目(石家庄铁道大学)(STKF201905) （石家庄铁道大学）
中央高校基本科研业务费项目(自然科学类)(300102210115) （自然科学类）
