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由Biot二维广义动力固结理论的形式基本控制方程出发,忽略孔隙流体的加速度,提出了饱和海床动力反应的时域有限元数值解法.联立静力平衡条件和Biot固结方程的退化法所得到的数值解可视为其特例.在比较算例中,退化法得到的超静孔压和有效应力幅值沿海床深度的分布与解析解一致.一般情况下,土骨架的加速度对海床的有效应力和超静孔压影响很小,控制方程可以退化为Biot理论.成层海床上部的粗砂层不会使超静孔压幅值在海床表面下较浅的深度内迅速衰减,难以改变海床的瞬时循环液化深度.
Based on the basic governing equations of Biot two-dimensional generalized dynamical consolidation theory, the acceleration of pore fluid is neglected, and the numerical solution of the time-domain finite element method for the dynamic response of the saturated sea bed is proposed. The simultaneous static equilibrium conditions and the Biot consolidation equations are degenerated The numerical solution obtained by the method can be regarded as its special case.In the comparative example, the distribution of excess pore water pressure and the effective stress amplitude of the coastal sea bed obtained by the degenerate method is consistent with the analytic solution.Generally, the acceleration of the soil skeleton The effective stress of the sea floor and the excess pore pressure have little effect on the control equations and can be degenerated into the Biot theory. The grit layer in the upper part of the stratigraphic sea floor does not make the excess pore pressure amplitude shallow within the surface of the sea floor Rapid decay, it is difficult to change the instantaneous circulation of the sea bed depth of liquefaction.