Cofferdams need to be used to ensure the dry construction site for foundation pit located in water areas.However,the study on cofferdams deformation is still not perfect.Based on the research background of Aixihu Tunnel project in Nanchang,Midas GTS NX finite element software was used to study the influence of cofferdam width and tie bar position on the deformation law of double-row steel pipe pile cofferdam.The model is proved to be correct by comparing the simulation results with the actual measure-ments.The results show that the cofferdam width has an appropriate range,too small and too large will cause the cofferdam deforma-tion is too large.In this project,the reasonable width of cofferdam should be 3.5～4.5 m.The change of cofferdam width has little in-fluence on the excavation deformation of cofferdam foundation.Considering the deformation of both sides of the steel pipe pile,the de-formation of the tie rod is small when it is set at 0.8 m on the top of the cofferdam.
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