Taking the new Xinxiagang double-line ship lock project as an example,the finite element analysis model of ship lock chamber and surrounding soil is established by ABAQUS.According to the prototype observation data during the construction period,model verification is carried out.Based on the observation data and numerical analysis,the mechanical behaviors of single-anchor piles and opposite-pull plate piles during the construction process are discussed.The internal forces and deformation of two different sheet pile structures with the excavation of the soil in the chamber and the earth pressure distribution on both sides of the sheet pile wall are studied.The results show that during the construction period,the deformation of the single-anchor piles on both sides is basically the same,and the deformation of the opposite-pull plate piles in the middle is basically the same and the integrity is good.When one side of the chamber is excavated,the working condition of the opposite-pull sheet pile on the excavation side is the same as that of a single anchor sheet pile,and back piles playing anchor role.The horizontal displacement,earth pressure are gradually increasing with the soil depth.