格栅加筋土挡墙流固耦合动力响应的有限元解法

FEM on Coupled Hydromechanical Dynamic Response of Geogrid Reinforced Soil Retaining Wall

格栅加筋土挡墙由面板、格栅和填土组成,其流固耦合结构特性越来越引起工程界的关注。文中根据格栅加筋土挡墙筋土相互作用特点,将土工格栅与其上下表面一定厚度的土层视为具有应变相容条件的筋土复合材料。基于自洽理论导出筋土复合材料的本构模型,引入饱和多孔介质模型来模拟填土和筋土复合材料,依此建立饱水格栅加筋土挡墙结构特性数值分析的数学模型。采用Galerkin加权残值法推导出有限元分析方程,利用Newmark逐步积分法求解该方程,可得饱水格栅加筋土挡墙的动力响应。

Geogrid reinforced soil retaining wall （GRSRW） is composed of panel, geogrid and soil, its coupled hydromechanical structural characteristics are increasingly emphasized in practice. In this paper, based on the characteristics of the reinforcement- soil interaction, the grogrid and soil around it with a definite thickness were regarded as a kind of composite material with strain - compatible condition. A saturated porous media model was introduced to simulate the soil and reinforcement - soil composite material hereby and the mathematic model for numerical analysis on structural characteristics of GRSRW was built up. The FEM equations were deduced from the standard Galerkin procedure, resolving these equations, we can gain the relevant dynamic response of saturated GRSRW.