上海交通大学学报

上海交通大学学报（自然版） ›› 2015, Vol. 49 ›› Issue (07): 940-945.

• 建筑科学 • 上一篇    下一篇

黄土斜坡变形失稳破坏特征的振动台模型试验

吴志坚1,2,3，雷天1,2，陈豫津1,2，王平1,2,3，柴少峰1,2,3   

  1. (1. 中国地震局 （甘肃省） 黄土地震工程重点实验室， 兰州 730000；2. 中国地震局 兰州地震研究所， 兰州 730000； 3. 甘肃省岩土防灾工程技术研究中心， 兰州 730000)
  • 收稿日期:2014-10-30 出版日期:2015-07-30 发布日期:2015-07-30
  • 基金资助:

    国家自然科学基金项目(41472297)，国家科技支撑计划（2015BAK15B01），国家重点基础研究发展规划（973）项目（2012CB026106）资助

Deformation and Instability Characteristics of Loess Slope Based on Shaking Table Model Test

WU Zhijian1,2,3，LEI Tian1,2，CHEN Yujin1,2，WANG Ping1,2,3，CHAI Shaofeng1,2,3   

  1. (1. Key Laboratory of Loess Earthquake Engineering, China Earthquake Administration and Gansu Province, Lanzhou 730000, China; 2. Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China;3. Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province, Lanzhou 730000, China)
  • Received:2014-10-30 Online:2015-07-30 Published:2015-07-30

摘要：

摘要：  基于低含水率黄土纯土层、低坡角斜坡、1∶25相似比的振动台模型试验，研究了黄土斜坡在地震作用下的变形发生和失稳破坏过程及其加速度和应力响应特征，对典型黄土斜坡强震失稳机制进行了探讨.试验表明：黄土斜坡对输入地震波存在着明显的临空面放大效应以及垂直放大效应；在烈度为VII度的地震荷载作用下，斜坡模型在其坡顶前缘处发生了最初的张性裂缝，随着地震强度的增加，斜坡顶部的张性裂缝逐渐由前缘向后缘推进，最终形成一系列的永久性张性破坏；在烈度为IX度的地震作用下，模型顶部出现了明显的震陷，呈现出典型的震陷型滑坡的特点.

关键词: 黄土斜坡, 振动台试验, 动力响应, 变形失稳

Abstract:

Abstract： Based on the shaking table test of 1∶25 pure loess model with low water content and low angle,  the deformation and instability process of the loess slope under the earthquake were studied, the response characteristic of acceleration and stress was obtained, and the instability mechanism of typical loess slope under strong earthquake was discussed. The results show that the input of seismic wave has a surface and vertical amplification effect on the loess slopes. The top of the typical loess slope appear to have a series of tensile cracks when it suffers from a seismic intensity as high as VIII degree, with the increase of the intensity of the earthquake, the tensile cracks of the top develop from front to back gradually and form a series of permanent tensile failure. The top of the slope appears to have a significant seismic subsidence and presents the typical characteristics of seismic subsidence landslide when the loess slope suffers from a seismic intensity of as high as IX degree.

Key words: loess slope, shaking table test, dynamic response, deformation and instability

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