| At present, there are many domestic and overseas engineering practices of double-walled cofferdam with steel sheet piles. Due to its good integrity, construction convenience and multifold testing measures, double-walled cofferdam with steel sheet piles is widely employed in port engineering. For computational convenience, conventional methods is mainly based on earth-pressure theory, thus can not consider these factors such as the effects of contact behavior between backfill and sheet piles. Therefore, the static and dynamic characteristics of double-walled cofferdam with steel sheet piles are conducted around two faces as follows by numerical method in this paper:1 Based on ABAQUS codes platform, the characteristics of internal forces and deformation of double-walled cofferdam with steel sheet piles at different water heights are analyzed by developing elasto-plastic FE model in plane stress state, adopting Mohr-Coulomb yield criterion to describe the elaso-plasticity of subsoil and Coulomb contact pair theory to simulate the contact behavior between sheet piles and backfill.2 On the basis of ABAQUS programs, dynamic FEM model is developed with Lanczos eigenvalue method to abstract natural frequency and mode, and with Newmark step-by-step integration method to solve dynamic equations considering geometrical nonlinearity. And then dynamic characteristics of double-walled cofferdam with steel sheet piles are discussed by numerical analyses of seismic response spectrum method and dynamic time-history method. |
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