半空间准饱和土中瑞利波的传播特性研究  

Characteristics of Rayleigh waves in half-space of partially saturated soil

作　　者：周新民[1] 夏唐代[1] 

机构地区：[1]浙江大学岩土工程研究所

出　　处：《岩土工程学报》2007年第5期750-754,共5页Chinese Journal of Geotechnical Engineering

摘　　要：基于Biot两相饱和多孔介质理论,推导了准饱和土中透水与不透水两种边界条件下瑞利波弥散特征方程,通过数值算例分析了饱和度对瑞利波速度、位移、能流分布及粒子运动规律的影响。结果表明:瑞利波主要反映剪切波特性,其速度受饱和度的影响不大,但瑞利波位移及粒子运动轨迹受饱和度影响显著,饱和度的微量减小将引起位移的显著降低以及粒子运动轨迹大小和形状改变;随着饱和度的减小,瑞利波能量中压缩波分量会有少量增加;瑞利波随深度衰减快,其传播深度约为波长的2.0倍。Based on the Biot＇s theory, the velocity equations were derived in a half-space of partially saturated soil with pervious and impervious surfaces. The effects of the saturation on velocity, displacement, energy-flux distribution and trajectory of Rayleigh wave were analyzed by numerical methods. It was shown that the saturation effect on the velocity of Rayleigh waves was not very obvious, but there was a substantial influence of saturation on the displacement, trajectory and energy-flux distribution of Rayleigh waves. Even a slight decrease of full saturation might lead to an obvious decrease of the displacement and the size and shape change of the trajectory. The compressional wave components of Rayleigh wave energy would slightly increase with the decreasing saturation. The propagation depth of Rayleigh waves was about 2.0 times of wavelengths.

关 键 词：准饱和土 瑞利波 特征方程 传播特性 

分 类 号：TU435[建筑科学—岩土工程]