地震作用下加筋土路基力学行为的弹塑性分析  

Elasto-plastic Analysis of Reinforced Subgrade Under Seismic Loading

作　　者：袁捷[1] 曾四平[1] 祝云琪[1] 凌建明[1] 

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海200092

出　　处：《同济大学学报（自然科学版）》2008年第4期483-487,共5页Journal of Tongji University:Natural Science

基　　金：交通部西部交通建设科技资助项目(200431800006)

摘　　要：就地震作用下加筋土路基的力学行为进行了分析.计算时土体选用能考虑动载作用下土体中孔隙水压力的变化等因素影响Finn弹塑性动本构模型,土体与筋材的相互作用通过筋土界面模型进行模拟,采用Biot动力固结理论描述土体在流体与动力相互作用下的力学特征.然后利用该模型分析了在地震荷载作用下,加筋与不加筋土路基的侧向位移、沉降与土体中孔隙水压力分布的特点.结果表明:土体加筋可以在一定程度上缓解地震对路基产生的破坏作用.该方法简单实用,且模型中的参数可以通过常规的土工试验获得.对分析地震荷载作用加筋土路基的力学行为有很好的指导作用.The paper presents an analysis of the mechanic characteristics oi relntorced subgrade under seismic loading. The soil is simulated by Finn elastic-plasticity dynamic constitutive model with the consideration of the influence of change of pore pressure. The interaction between soil and reinforced material is simulated by interface model. The mechanic characteristic of reinforced subgrade under the action of fluid and dynamic loading is depicted by Blot dynamic consolidation theory. An analysis is made of the characteristics of lateral displacements, settlements of subgrade, the variety of pore pressure in the soil under seismic loading based on the model. Results show that reinforcement in soil can reduce the damage of seismic loading to subgrade to a degree. This method is simple and practica. The parameters in this model can also be obtained by general geotechnical experiments. This paper is instructive in the analyzing of the mechanic characteristic of reinforced subgrade under seismic loading.

关 键 词：加筋土路基 地震 动力本构模型 动力固结 

分 类 号：U416.1[交通运输工程—道路与铁道工程]