| 堆积层滑坡地震动力响应的物理模型试验 |
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| 引用本文： | 于一帆,王平,王会娟,许书雅,郭海涛.堆积层滑坡地震动力响应的物理模型试验[J].岩土力学,2019,40(Z1):172-180. |
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| 作者姓名： | 于一帆 王平 王会娟 许书雅 郭海涛 |
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| 作者单位： | 1. 中国地震局兰州地震研究所，甘肃 兰州 730000；2. 中国地震局 黄土地震工程重点实验室，甘肃 兰州 730000；
3. 西安理工大学 岩土工程研究所，陕西 西安 710048 |
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| 基金项目： | 中国地震局地震预测研究所基本科研业务费专项（No.KY1805027，No.2018IESLZ07)；甘肃省重点研发项目（No.18YF1FA101）。 |
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| 摘 要： | 以玉树7.1级地震诱发的玉树机场路堆积层滑坡为对象，该滑坡坡度约为10o，长×宽×厚为317 m×482 m×19.8 m，由以碎石土为主的上覆层、卵石土为主的滑动带及基岩3层组成，开展大型振动台模型试验，探究震后边坡再次承受振动荷载的能力以及地震垂直分量对坡体稳定性的贡献，分析其动力响应特征和失稳破坏机制。结果表明，强震作用下堆积层滑坡的永久变形是造成地震地质灾害的重要因素；随着输入地震荷载增大，坡脚率先破碎沉降，坡体中部产生弧形裂隙并产生沉降，坡顶出现贯穿张裂隙和剪切裂隙并向坡腰推进，表现出典型的牵引性滑坡特征；峰值加速度(PGA)、动土压力以及加速度频谱与输入地震波的强度、滑坡高程呈正相关；PGA放大系数呈现出明显的非线性特征，其变化趋势随地震荷载强度增大而减小，地震波垂直分量对滑坡PGA放大系数影响略大于水平分量。
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| 关 键 词： | 堆积层滑坡 振动台模型试验 动力响应 傅里叶谱分析 |
| 收稿时间： | 2019-01-27 |
Physical model test of seismic dynamic response to accumulative landslide |
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| YU Yi-fan,WANG Ping,WANG Hui-juan,XU Shu-ya,GUO Hai-tao.Physical model test of seismic dynamic response to accumulative landslide[J].Rock and Soil Mechanics,2019,40(Z1):172-180. |
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| Authors: | YU Yi-fan WANG Ping WANG Hui-juan XU Shu-ya GUO Hai-tao |
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| Institution: | 1. Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou, Gansu 730000, China;
2. Key Laboratory of Loess Earthquake Engineering, CEA, Lanzhou, Gansu 730000, China;
3. Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an, Shaanxi 710048, China |
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| Abstract: | The accumulative landslide of Yushu Airport Road, induced by the Yushu M7.1 earthquake, has a slope of about 10 degrees and the size is 317 m × 482 m × 19.8 m in length, width and thickness direction. It is composed of three layers, i.e. an overlying layer consisted of gravel soil, a sliding zone consisted of pebble soil and a bedrock layer. In this paper, the large-scale shaking table model test is carried out to study the slope’s capacity to withstand the vibration load after the earthquake and the contribution of the vertical component of the earthquake to the stability of the slope, and its dynamic response characteristics and failure mechanism are also analyzed. The results show that the permanent deformation of accumulative formation’s landslide under strong earthquake is an important factor causing seismic geological hazards. With the increase of seismic intensity, the foot of slope firstly breaks down and settles. The arched fissures develop in the middle of the slope and the subsidence occurs. Furthermore, a series of tensile cracks and shear fractures occur at the top of the landslide and they advance towards the waist of the slope, showing typical tractive landslides. Peak ground acceleration(PGA), dynamic soil pressure and acceleration spectrum are positively correlated with the intensity of the input seismic wave and the landslide elevation. The PGA amplification coefficient exhibits distinct nonlinear characteristics, and its variation trend decreases with the increase of seismic load intensity. The vertical component of seismic wave has a slightly greater influence on the PGA amplification coefficient of landslide than the horizontal component. |
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| Keywords: | landslide shaking table model test dynamic response Fourier spectrum analysis |
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