Research on the difference of dynamic responses between bedding and toppling rock slopes based on shaking table test

被引：0
作者：
Yang C. [1 ]
Zhang L. [1 ]
Dong L. [2 ]
Tong X. [1 ]
Su K. [1 ]
Tang R. [3 ]
Li S. [4 ]
机构：
[1] School of Civil Engineering, Southwest Jiaotong University, Chengdu
[2] School of Resources and Safety Engineering, Central South University, Changsha
[3] Sichuan Highway Planning, Survey, Design and Research Institute Ltd., Chengdu
[4] China Science and Technology Advanced Rail Transit Research Institute Ltd., Zhuzhou
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2022年 / 41卷 / 02期
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
Bedding and toppling rock slopes; Difference of dynamic response; Elevation amplification effect; HHT method; Shaking table test; Slope engineering;
D O I：
10.13722/j.cnki.jrme.2021.0168
中图分类号：
学科分类号：
摘要：
Taking a bedding rock slope and a toppling rock slope in the Zheduoshan tunnel areaasreference, the shaking table test was designed and carried out. The differences of seismic dynamic responses of the two kinds of slopes are systematically comparedfrom the aspects offailure phenomenon, PGA amplification factor and time-frequency characteristics.The results show that the failure of the bedding slope is prior to that of the toppling slope, which indicates that the seismic stability ofthe toppling slope is better than that of the bedding slope. The damage of the toppling slope is mainly concentrated on the top of the slopesurface, while the failure mode of the bedding slope can be divided into three stages of cracking of the slope waist, formation of the sliding surfaceat the trailing edge of the slopeand collapse and instability of the slope. The acceleration responses of thebedding and toppling rock slopesshow obvious"elevation effect"and"surface effect". Under the action of 0.1g-0.5g amplitude seismic waves, the PGA amplification factor of the bedding slope is greater than that of the toppling slope. With strengthening the ground motion, the bedding slope is destroyed before the toppling slope, and its acceleration amplification effect is weaker than that of the toppling slope. Hilbert spectrum and Hilbert marginal spectrum clearly describe the propagation characteristics of the seismic energy in time-frequency domain of bedding and toppling slopes. The distributions of the seismic energy in time-frequency domain of the two kinds of slopes are similar, and the difference is mainly reflected in the amplification effect along the elevation. In addition, according to the Hilbert marginal spectrum, it is identified that the seismic damage of the toppling slope is mainly concentrated at the slope shoulder, while that the damage of the bedding slope occurs at the slope waist where a shear slip surface will form, whichis basically consistent with the phenomena observed in shaking table test. © 2022, Science Press. All right reserved.
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页码：271 / 281
页数：10
相关论文
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