关键词: 液化地基, 沉箱码头, 地震残余变形, 有效动应力分析

Abstract: The deformation control criterion in seismic engineering design is a new tendency in recent years; and the reason of the seismic residual deformation of large caisson quays is a complex problem in seaport engineering. The effective stress method is used in the study, in which nonlinear constitutive model of a multiple shear mechanism type is defined in strain space; and the effect of rotation of principal stress axis direction has been considered. By the method, the regularity of the seismic residual deformation of caisson quay wall top is analyzed caused by different influential factors such as the level of seismic wave, blow count of standard penetration test (SPT) and disposal extension of replaced sand under quay wall and backfill sand behind quay wall and width-height ratio, etc. Some conclusions are drawn as follows. The level of seismic wave, blow count of SPT and disposal extension of replaced sand under quay wall and width-height ratio are sensitive factors; and that a rational disposal extension in backfill sand behind quay wall exists. A series of calculation distribution figures in the paper can be applied to initially predict the seismic residual deformation of quay walls for engineering designers.

Key words: liquefied foundation, caisson quay wall, seismic residual deformation, effective stress analysis