坡形和加筋措施对地震响应影响的振动台模型实验研究  

Study on Influence of Shape and Reinforced Measures on Seismic Response in Large-Scale Shaking Table Model Tests

作　　者：吴伟[1] 姚令侃[1] 陈强[2] 

机构地区：[1]西南交通大学土木工程学院道路与铁道工程系,四川成都610031 [2]四川省交通厅公路规划设计研究院,四川成都610041

出　　处：《重庆交通大学学报（自然科学版）》2008年第5期689-694,共6页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金西部重大研究计划项目(90202007);西部交通建设科技项目(200731800003);西藏自治区交通厅科技项目(XZJK2002-1)

摘　　要：实施边坡工程地震性态控制设计方法的关键是揭示边坡土性、坡形对基岩地震动参数传递影响的规律。利用大型振动台分别进行了层状土与边坡模型的振动台对比实验、素土与铺设加筋材料的振动台对比实验。实验发现,与层状土对比,具有临空面的边坡对地震加速度峰值放大系数可增加约30%;素土与铺设加筋材料的层状土实验相比,后者对加速度峰值放大系数则可减小约20%;此外,还对地震作用下模型的动力特性进行了探讨,发现同一模型在重复实验后,土体损伤导致模型自振频率降低,此时土体对地震波表现出更强的放大效应。Revealing the influence of soil properties and slope shape on ground motion parameters of rock is the key to earthquake control design of slope engineering. The contrast test between slope model and layered soil model experiments through shaking table, as well as the contrast test between reinforced layered soil model and layered soil model are carried out. It is found that compared with layered soil, the amplitude magnification coefficient of seismic acceleration will increase by almost 30% in slope with free face;compared with layered soil, the amplitude magnification coefficient of seismic acceleration in reinforced layered soil can be reduced by 20%. In addition, the dynamic properties of the models under seismic force are discussed. It is found that the self-vibrating frequency of one model will decrease after repetitive vibration, and at the same time,the seismic acceleration of the soil shows a larger amplification.

关 键 词：地震 坡形 加筋土 振动台 

分 类 号：P315.9[天文地球—地震学]