1.CCCC Third Harbor Consultants Co.,Ltd;2.The Hong Kong Polytechnic University;3.wenzhou university
The purpose of this study is to perform a complete finite element simulation of the suction bucket foundation in clay using advanced soil constitutive model to establish the failure envelope of the suction bucket foundation. Firstly, the Hardening Soil model (HS) is used to analyse the centrifuge tests of suction bucket foundation in normally consolidated clay under different monotonic combined loadings by the finite element method. The comparisons between text and simulated results verify the effectiveness of the finite element analysis using the HS model. Then, a large number of finite element analysis is performed by radial swipe tests, and further extended to the failure mode of V-H-M (vertical force-horizontal force-bending moment) space. Based on this, the failure envelope on the H-M plane, the V-H plane, and the three-dimensional failure envelope surface in the V-H-M space are described. The results show that the H-M failure envelope is similar to an inclined ellipse; the effect of vertical load on the inclination of the H-M failure envelope can be ignored; the size of the H-M failure envelope decreases with the increase of the vertical load; there is a strong interaction between vertical and horizontal loads, that is, the V-H yield surface formed by vertical and horizontal bearing capacity is approximately a quarter ellipse. It can be seen that the size of the H-M inclined ellipse is controlled by the vertical load. Based on all these results of numerical simulations, a new analytical expression is finally proposed to express the three-dimensional failure envelope of the suction bucket foundation in V-H-M space.