Abstract:Aiming at the complex stress problem of caisson structure in soft soil area,taking the caisson foundation of rainwater storage tank in the first phase of container terminal renovation project in Luojing port area of Shanghai Port as an example,the key points of caisson design and construction of large storage tank structure are analyzed.The three-dimensional integral finite element calculation and analysis model is used to analyze the overall stress of the caisson structure in three stages:before sinking to the bottom,after sinking to the bottom and normal use.According to the results of stress analysis,considering the checking requirements of ultimate limit state and service limit state,the reinforcement design of each structural member is carried out respectively,and the amount of reinforcement is optimized.Based on the construction experience of engineering caisson foundations,the key points of caisson foundation construction are summarized.The results show that it is reasonable to use three-dimensional integral finite element analysis for the stress structure with complex stress,and some stress concentration parts should be reasonably judged before further structural design.During the construction of the caisson,it is necessary to strengthen the monitoring and formulate the construction emergency record to ensure the safety during the construction period.The research results can provide reference for design and construction of similar engineering.
