关键词: 地震, 防波堤, 砂性地基, 残余变形, 超静孔隙水压力, 液化度

Abstract:

The prediction of residual deformation and analysis of damage mechanism of breakwater are complicated problems in seaport engineering during earthquake. The nonlinear constitutive model of a multiple shear mechanism type in strain space is used in the study; and the effect of rotation of principal stress axis direction has been considered. The effective stress analysis of breakwater is given by considering both fine content of clay and equivalent SPT N-value; and some conclusions are achieved that the greater residual deformation of breakwater is induced by softened soil due to higher pore water pressure of soil. Then, the index of extent of liquefaction is applied to scale residual deformation of the breakwater; and the prediction relation of function is achieved between residual deformation and extent of liquefaction. The prediction values are close to investigation and numerical analysis values; it is shown that the function of prediction is credible. Some reference is provided by this prediction method of residual deformation by extent of liquefaction for similar breakwaters.

Key words: earthquake, breakwater, sandy soil, residual deformation, excess pore water pressure, extent of liquefaction