【摘要】 应用动力弹塑性有限元方法,研究了各种设计参数对土工格栅加筋土挡墙动力响应的影响。应用了可以描述砂性土非线性静动力性能的弹塑性模型模拟填土;采用可以描述土工格栅在反复受载情况下滞回性质的边界面弹塑性模型模拟加筋层;土与结构的相互作用由一种可以描述界面滑移、脱开及闭合的有厚度薄层单元模拟。在有限元分析中同时考虑了水平与竖直两种地震激励。研究内容包括竖向地震影响、加筋长度、加筋层间隔、面板预制混凝土块重量、面板与填土界面摩擦角、预制混凝土块之间摩擦角等对加筋土挡墙变形、加筋层内力等的影响。更多还原

【Abstract】 A sand model that was capable of simulating the pressure-dependency and cyclic hardening behavior of sandy soils was used to model the back-filled soil,and a bounding surface elasto-plastic model for geosynthetics that could capture the cyclic hysteresis of geogrids was used to model the reinforcement.Slip-elements were employed to describe the soil-structure interaction behavior in the geosynthetic-reinforced soil(GRS) retaining wall.Horizontal and vertical excitations were considered simultaneously in the analyses.The study was focused on the deformation of the retaining wall and the internal forces in the reinforcements and the object of study included the effects of the vertical excitation,the reinforcement length,the reinforcement spacing,the weight of the facing blocks,the frictions between soil and facing blocks as well as those between two facing blocks.更多还原