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.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2007年第5期750-754,共5页
Chinese Journal of Geotechnical Engineering
关键词
准饱和土
瑞利波
特征方程
传播特性
partially saturated soil
Rayleigh wave
secular equation
propagation characteristic
