水平地震动作用下平台宽度对边坡动力响应及稳定性影响  

The study of effect of platform width on dynamic response and stability of soil slope under horizonal seismic loading

作　　者：黄诗渊[1] 刘健[1,2] 邓增凯 袁伟 胡骏峰 

机构地区：[1]重庆交通大学河海学院,重庆400074 [2]重庆市水利电力建筑勘测设计研究院,重庆470074 [3]赣州市水文局,江西赣州341000

出　　处：《中国科技论文》2015年第7期839-845,共7页China Sciencepaper

基　　金：重庆市研究生科研创新项目(CYS14166)

摘　　要：采用有限元软件建立多级边坡计算模型进行数值模拟,分析水平地震作用下不同高程处平台的宽度对边坡动力响应及稳定性的影响。计算结果表明:增加平台宽度,对边坡的位移、加速度响应均有不同程度的影响,增加中部平台的宽度,对边坡加速度响应有更为显著的减缓效果;在地震动作用下,边坡首先从坡脚处产生剪切变形,并逐渐沿坡体向坡顶处延伸,边坡的剪切应变随平台宽度的增加而显著减小;随着不同高程处平台宽度的增加,边坡的静、动力稳定性均有所增加,增加中部平台的宽度对提高边坡的动力稳定性的效果更为显著,在边坡工程设计中,应考虑适当加宽中部平台宽度;此外,在不同地震烈度条件下,随着平台宽度的增加,边坡动力稳定性的增幅呈规律性变化。This paper presents a numerical simulation using a multistage slope calculation model to analyze the impact on slope dynamic response characteristics and dynamic instability mechanism influenced by a stepped slope platform width under horizontal seismic loading. The numerical results show that the increase of platform width could affect both the displacement and acceleration of the slope in various content, and the acceleration could slow down significantly with the increasing of the width of the central platform. Upon the seismic loading, the slope will be deformed by shear at the toe first, and the shear deformation is extended upwards gradually. In general, the shear deformation of the slope is reduced with the increase of the width of the platform. By increasing of widths of platform at different elevations, the static and dynamic stabilities for the slope are increased, especially by increasing the width of the central platform. Therefore, in the slope engineering design, the width of central platform should be considered appropriately. In addition, under the seismic loading with different earthquake intensities, with the increase the platform width, the dynamic stability of the slope is subjected to regular variations.

关 键 词：地震 多级边坡 动力响应 平台宽度 剪应变 稳定性 

分 类 号：TU435[建筑科学—岩土工程]