Aiming at the problems of excessive settlement,insufficient stability,poor pertinence and low reinforcement efficiency of traditional foundation treatment methods induced by large-load stacking behind port shore connection structures under deep soft soil conditions,this paper presents a study on the design and application of zoned differentiated foundation treatment based on the Dapukou container terminal project in Jintang port area,Ningbo-Zhoushan Port.A combination of theoretical calculation,numerical simulation and on-site measurement is adopted for settlement prediction and stability analysis.The research results indicate that under the zoned differentiated design,the post-construction settlement is controlled within 30 cm,and the differential settlement between different blocks is less than 5 cm,which meets the service requirements of the yard.The measured data show that under the same load condition,the deviation in reinforcement effect between vacuum combined surcharge preloading and surcharge preloading does not exceed 10%.In addition,the zoned load reduction scheme increases the overall stability safety factors of the shore connection structure under construction conditions and seismic conditions by 26% and 23% respectively,both of which meet the requirements of the specification.This study verifies the feasibility and superiority of the zoned differentiated foundation treatment method,solves the deformation compatibility and stability issues associated with large-load surcharge preloading on deep soft soil foundations,and offers a replicable and scalable design scheme and technical reference for similar foundation treatment projects of shore connection structures in coastal deep soft soil regions of China.