The sheet-pile structure is extensively used in deep excavations and wharfs as the retaining structure. The key issue is the forces acting on the sheet piles as well as their deformations under the earth pressure. However, the deformations closely relate to the earth pressure. This issue becomes a typical problem of soil-structure interaction. Based on FEM numerical simulations, the working mechanism of the sheet-pile structure is investigated. The following aspects are studied with regard to a wharf case d...