中文摘要：

在Biot饱和土波动理论的基础上,采用波函数展开法,研究了饱和土体中单个圆柱体对倾斜入射PⅠ波的散射特性,计算了背向散射谱和总散射截面积。结果表明,饱和土体中PI波倾斜入射时,随着倾斜入射角的增大,总散射截面积在减小,产生的散射波主要以PI波和SV波为主;随着饱和土体渗透系数的减小,PⅠ波、PⅡ波和SV波背向散射谱平均幅值均呈增大趋势,但PI波背向散射谱幅值变化程度较小。

英文摘要：

On the basis of Biot＇s dynamic theory,the scattering of obliquely incident PI-wave around a cylinder in saturated soil was investigated by using wave function expansion technique,and the backscattering spectrum and the total scattering cross section of the cylinder were calculated.The numerical results show that when the obliquely incident wave is PI-wave,the total scattering cross section decreases with the increase of obliquely incident angle,and the scattered waves produced by the cylinder are just PⅠ-wave and SV-wave.The average amplitude of backscattering spectrum for PⅠ-wave,PⅡ-wave and SV-wave increases with the decrease of permeability coefficient of saturated soil,but the change range of the amplitude of backscattering spectrum for PI-wave is small.