关键词: 裙式吸力基础, 竖向单调加载, 饱和砂土, 土体变形

Abstract: Sandy soil deformation and foundation failure are studied by using model tests and the finite element method to explore the behaviors of traditional suction foundation and skirted suction foundation in saturated fine marine sand under vertical monotonic loading. The effects of the skirt structure on sand deformation are discussed. The results show that the range of soil deformation caused by traditional suction foundation is smaller than that of skirted suction caisson by 31%~35%, which illustrates that the skirted suction caisson could make more soil to support the horizontal bearing capacity. The skirt width could increase the soil deformation, and the skirt height has a restraint function on the soil. Under the same skirt width, the soil deformation area decreases with increase of the skirt height. The failure modes of suction caissons in saturated sand are in accordance with Prandtl’s whole shear failure.

Key words: skirted suction caisson, vertical monotonic loading, saturated marine fine sand, soil deformation