【作者】 陈炜昀； 刘志军； 陈国兴； 夏唐代； 贺鹏飞；

【Author】 Chen Weiyun;Liu Zhijun;Chen Guoxing;Xia Tangdai;He Pengfei;Institute of Geotechnical Engineering,Nanjing Tech University;MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering,Zhejiang University;

【机构】 南京工业大学岩土工程研究所； 浙江大学软弱土与环境土工教育部重点实验室；

【摘要】 地球表面绝大部分土层并非处于完全饱和状态,故采用传统的饱和土两相介质理论进行动力学分析时,计算结果往往与实际情况不符。针对这一客观问题,本项目拟以非饱和土为研究对象,在三相孔隙介质波动理论的基础上开展了非饱和土体半空间中Rayleigh波的弥散特性研究。分别考虑了两种不同的边界条件:(a)不透水不透气地基边界,(b)透水透气地基边界。根据边界条件及相关的本构关系式,推导出相应Rayleigh波的弥散方程,再通过Newton-Raphson法进行数值求解。最后讨论了在不同边界条件下,非饱和土地基表面附近Rayleigh波的弥散特性受到地基土饱和度和频率变化的影响。计算结果表明:两种边界条件下,不同频率的Rayleigh波的传播均受到地基土饱和度变化的影响。更多还原

【Abstract】 Most of the soil of the earth’s surface is not completely saturated,so when the traditional two-phase media theory is used for dynamic analysis,the results are often inconsistent with the actual situation.In view of this objective problem,the unsaturated soil is chosen to be our research object.Based on the wave theory of three-phase porous media,the research on the dispersion characteristics of Rayleigh wave in unsaturated soil half-space is carried out.Two different boundary conditions are considered:(a) water/air impermeable boundary and(b) water/air permeable boundary.According to the boundary conditions and constitutive relations,the corresponding dispersion equations of Rayleigh wave are derived.Then,through the Newton-Raphson method,the equations could be solved numerically.Lastly,the influences of soil saturation degree and frequency on the dispersion characteristics of the Rayleigh wave at different boundary conditions are discussed.The results show that,at both these two kinds of boundary conditions,the propagation of the Rayleigh waves with various frequencies is affected by the saturation change.更多还原