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| Research on the difference of dynamic responses between bedding and toppling rock slopes based on shaking table test |
| YANG Changwei1，ZHANG Liang1，DONG Longjun2，TONG Xinhao1，SU Ke1，TANG Rui3，LI Sifeng4 |
(1. School of Civil Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；2. School of Resources and
Safety Engineering，Central South University，Changsha，Hunan 410012，China；3. Sichuan Highway Planning，Survey，
Design and Research Institute Ltd.，Chengdu，Sichuan 610041，China；4. China Science and Technology Advanced Rail
Transit Research Institute Ltd.，Zhuzhou，Hunan 412007，China) |
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Abstract Taking a bedding rock slope and a toppling rock slope in the Zheduoshan tunnel area as reference，the shaking table test was designed and carried out. The differences of seismic dynamic responses of the two kinds of slopes are systematically compared from the aspects of failure 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 of the toppling slope is better than that of the bedding slope. The damage of the toppling slope is mainly concentrated on the top of the slope surface，while the failure mode of the bedding slope can be divided into three stages of cracking of the slope waist，formation of the sliding surface at the trailing edge of the slope and collapse and instability of the slope. The acceleration responses of the bedding and toppling rock slopes show obvious “elevation effect” and “surface effect”. Under the action of 0.1 g–0.5 g 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，which is basically consistent with the phenomena observed in shaking table test.
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2022, Vol. 41 
