【摘要】 基于Boit饱和多孔介质理论,采用文克勒地基梁模型,研究了表面透水的饱和土介质中顶部固接的桩对瑞利波的横向响应。分别计算了软土和硬土两种情况下不同深度桩的响应、饱和土的孔隙率对桩响应的影响、土介质相对刚度对桩响应的影响、fc-z空间桩响应的分布、桩顶约束条件的影响,并与桩顶自由的结果进行了比较。结果表明,饱和土介质中桩对瑞利波的横向响应受波的频率、土介质性质、桩土刚度比、桩顶约束条件等因素的影响。整体来看,瑞利波对桩的横向影响自上而下大致呈衰减趋势,在地表处影响最大;瑞利波对桩的影响深度随频率的降低而扩大;桩、土之间的水平相对位移幅度与土的孔隙率、相对刚度比均呈正相关关系;同频率下,相对软土地基来说硬土地基中桩受瑞利波的影响较深;顶部固接比顶部自由的桩对瑞利波的响应小。计算结果对工程抗震设计具有参考价值。更多还原

【Abstract】 Based on Boit’s theory of saturated porous medium,the pile lateral responses under Rayleigh wave are studied.The Winkler foundation beam model is adopted and the pile top is fixed in non-watertight saturated soil on surface.The following cases are studied:①pile responses in soft and hard soil in different depth;② pile responses influenced by saturated soil porosity;③pile responses influenced by relative rigidity of soil medium;④pile responses distribution in fc～z space,⑤the effects of constrain conditions,and the results are compared to the results of top free pile.The Results indicate that:the pile lateral responses under Rayleigh wave are affected by frequency,characters of soil medium,pile-soil rigidity ratio and constrain conditions of pile top.Generally,the influence of Rayleigh wave to pile lateral movement appears a descend tendency from top to bottom,and the maximum value appears on the surface;the influencing depth of Rayleigh wave to pile extends when frequency decrease;the relative lateral displacement between pile and soil assumes positive correlativity with porosity and relativity rigidity ratio;under the same frequency,the Rayleigh wave influence on pile in the hard soil is deeper than that in soft soil.;the responses are smaller when the top is consolidated than that is free.The results are useful to engineering anti-seismic design.更多还原