二维完全耦合有限元地震分析程序SUMDES2D

SUMDES2D是二维完全耦合有限元地震分析程序,可用于分析土工结构在多向振动作用下的地震响应.该程序是基于动量守恒和质量守恒两个物理定律,以及分别描述土骨架、孔隙水和渗流等3个本构关系的有效应力分析程序.程序中嵌入了基于与状态相关的剪胀性的临界状态砂土模型.该程序不仅能给出土结构的总体响应,如位移、孔隙压力和加速度等,且能给出土单元局部的应力路径和应力应变关系.介绍了SUMDES2D的理论推导,举例说明该程序在土坡流动液化变形分析中的应用.

SUMDES2D, a 2D fully coupled FE earthquake analysis program

SUMDES2D is a two dimensional fully coupled finite element earthquake analysis program which can be used in the analysis of earth structure under multi-directional earthquake shaking. The procedure is formulated under the framework of Biot based on the physical laws of the balance of momentum and conservation of mass in conjunction with three separately defined constitutive laws for soil skeleton, pore fluid and seepage flow respectively. A newly developed critical state sand model, which is formulated based on the concept of state-dependent dilatancy is incorporated in the procedure. The procedure can give not only global response of earth structure, such as displacement, pore pressure, and acceleration response, but also local stress path and stress-strain relationship of soil element. This paper presents the theoretical basis of the numerical procedure as well as example of flow-liquefaction deformation analysis.