This paper studies the settlement behaviors of a deep soft clay subgrade in an artificial island. The centrifugal tests are performed to simulate the settlement of foundation soils with a thickness of 60 m. Based on the tests

a 2D finite element model is developed to analyze the settlement behaviors of the foundation soils with implementing an elasto-viscoplasticity constitutive model. Comparisons between centrifugal tests and numerical analysis show that the post-construction settlement curves are in good agreement. The settlement rates are larger in the early stage

but keep stable in the later stage. The dissipation of excess pore water pressure of numerical results is faster than model test for shallow layers; but the tendency from two test has a good agreement in deep layers. The reliability of the numerical method is demonstrated by the consistency between the experimental and numerical results.