• You are welcome to ERC!
引用本文:
【打印本页】   【HTML】   【下载PDF全文】   View/Add Comment  【EndNote】   【RefMan】   【BibTex】
过刊浏览    高级检索
本文已被:浏览 22次   下载 0  
分享到: 微信 更多
Study of shaking table test on dynamic response characteristics and failure mechanism of loess slope with low angle
蒲小武
中国地震局兰州地震研究所
摘要:
披盖于地表的天然黄土大多含水量较低,边坡稳定性较好。但当遭受强烈地震作用时,坡体内强烈的动应力作用便会诱发规模不等的滑坡灾害。本文通过大型振动台模型试验,揭示黄土边坡的动力响应特征与失稳破坏过程。试验结果表明:边坡模型不同部位有着差异较大的振动模态,一阶固有频率随距坡顶及斜坡面深度的增大而增大。边坡在特定动载作用下,不同部位响应的加速度会因输入波频谱特性与不同部位振动模态的耦合关联而改变,呈现区域差异性。随动载强度增大,在坡顶动力响应强烈的区域会出现急剧的微结构损伤-累积的残余变形演化-拉剪耦合的失稳破坏过程,本文提出的Sd值能很好的反映斜坡的变形失稳破坏过程。
关键词:  
DOI:
分类号:
基金项目:
Study of shaking table test on dynamic response characteristics and failure mechanism of loess slope with low angle
PU Xiaowu
Lanzhou Institute of Seismology, CEA
Abstract:
The natural loess covering the ground surface has low water content, and correspondingly loess slope has good stability. But when it is subjected to strong earthquakes, the strong dynamic stress in slope would induce landslide disasters of different sizes. In this paper, a large-scale shaking table model test is used to reveal the dynamic response and instability failure process of the loess slope. The test results show that different parts of the slope have different vibration characteristics, and the first natural frequency of the model increases with the increase of the depth from slope top to slope bottom. The response acceleration of different parts would change due to the coupling relationship between the spectral characteristics of input wave and the natural frequency of different parts of slope, showing the characteristics of regional differential dynamic response. With the increase of dynamic loading intensity, because of the different dynamic response, stress state and boundary conditions of different parts of slope, there would be a rapid microstructural damage, cumulative residual deformation evolution, and tension-shear coupling instability failure process at the top of the slope with strong dynamic response. The Sd values presented in this paper could reflect soil damage and slope instability and failure.
Key words:  Loess slope, shaking table, dynamic response, microstructure damage, failure