中文摘要：

目前瑞利波在地基加固效果评价、无损检测和反演土层参数等方面有着广泛的应用，然而这些应用均忽略了土体中气体的影响．针对工程中常见的准饱和土以及基于由混合物理论建立的准饱和土中波的动力控制方程，推导了准饱和土中的瑞利波特征方程．通过数值计算，讨论了半空间准饱和土中压缩波、剪切波与瑞利波波速度的弥散特性以及位移情况．研究表明，饱和度对瑞利波速度的影响较小，对位移的影响却很显著．

英文摘要：

Currently, Rayleigh wave is applied widely to evaluating ground reinforce effect, undistructive detecting and inverse analysis of ground parameter. However, the influences of gas on the applications are ignored. For the nearly saturated soil, by analyzing the dynamic equation of nearly saturated soil, which based on mixture theory, the secular equations of Rayleigh waves in a nearly saturated half-space soil are developed. Rayleigh wave dispersion characteristics and its displacement in a nearly soil are discussed. The numerical results show that a slight decrease of full saturation has a little influence on the velocity of Rayleigh wave but may cause a much greater displacement compared with a fully saturated soil.