中文摘要：

近年来，在各种近海建筑物的建设中，桩基础被越来越广泛地应用。关于海床内桩基各层位对波浪动力响应相位差的研究，国内外学者研究的重点主要集中在海床内各层位孔隙水压力的相位变化。而关于波浪作用下海床各层位土体总压力相位的研究则很少。本研究采用波浪水槽实验，在土床未扰动和土床扰动液化两种工况下，分别施加不同波高的波浪，对底床各层位土体总压力的相位进行对比研究。实验结果表明，当土体未运动时，在渗透性和饱和度均匀的土体中，各层位土体之间不存在相位差。当底床液化后，土体出现显著分层现象，在液化土层和不动土层间存在显著的相位差。此时，总压力振幅呈现先增大后减小的现象，且在床面下-10cm处出现最大值。

英文摘要：

In recent years, the pile foundation has been used more and more widely in the offshore constructions. With respect to the research on phase lags produced in the re sponse of pile base pressure to waves at different horizons below the seabed, researchers both at home and abroad have paid much more attention to the phase lags of pore water pressure than to those of total soil pressure. In this paper, the phase lags of the total soil pressure at different horizons below the seabed are studied by means of in-lab wave flume experiment. This is conducted under the conditions of liquefaction and non-lique- faction at different wave heights. The results show that if the soil is fully saturated and has a homogeneous permeability, there is no phase lag occurring between different horizons under the condition of non-liquefaction. But under the condition of liquefaction, obvious phase lags occur between the liquefied horizon and the non-liquefied one, during which the amplitude of the total pressure first increases and then decreases, with the maximum being at a depth of --10 cm.