Fully coupled finite element model for dynamics of partially saturated soils

Understanding the response of partially saturated earth structures under various static and dynamic loads is important for the design and construction of economical and safe geotechnical engineering structures. In this study, the numerical approach is used to understand the dynamics of partially saturated soils. The mathematical equations governing the dynamics of partially saturated soils are derived based on the theory of mixtures and implemented within a finite element framework. The stress–strain behavior of the soil is represented by an elasto-plastic constitutive model for unsaturated soil based on bounding surface concept and the moisture-suction behavior is modeled using van Genuchten model. Fully coupled finite element simulations are performed to study the response of partially saturated soil embankment under earthquake loading and validated with centrifuge test results available in the literature. The predicted displacement responses are in good agreement with the measured responses. The pore water pressure, pore air pressure, matric suction, the degree of saturation in various elements and the response of the embankment under different initial moisture content are also discussed.     

当代地球物理学研究的核心科学问题和发展导向

地球物理学在20世纪的百年中取得了辉煌的成就,也提出了一系列有待研究和探索的科学问题.基于国家战略需求和自主创新的方针,基于国家在金属矿产资源、油气能源、地震与火山灾害和军事与国防的需求和防范,则必须深化研究和认识地球本体.为此,地球内部物质与能量的交换、深层过程和动力学响应已成为21世纪地球科学研究和发展的核心,地球物理学必须造福于人类.