Abstract
Shake table testing was performed to investigate the dynamic stability of a mid-dip bedding rock slope under frequent earthquakes. Then, numerical modelling was established to further study the slope dynamic stability under purely microseisms and the influence of five factors, including seismic amplitude, slope height, slope angle, strata inclination and strata thickness, were considered. The experimental results show that the natural frequency of the slope decreases and damping ratio increases as the earthquake loading times increase. The dynamic strength reduction method is adopted for the stability evaluation of the bedding rock slope in numerical simulation, and the slope stability decreases with the increase of seismic amplitude, increase of slope height, reduction of strata thickness and increase of slope angle. The failure mode of a mid-dip bedding rock slope in the shaking table test is integral slipping along the bedding surface with dipping tensile cracks at the slope rear edge going through the bedding surfaces. In the numerical simulation, the long-term stability of a mid-dip bedding slope is worst under frequent microseisms and the slope is at risk of integral sliding instability, whereas the slope rock mass is more broken than shown in the shaking table test. The research results are of practical significance to better understand the formation mechanism of reservoir landslides and prevent future landslide disasters.
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Acknowledgement
The authors acknowledge the financial support provided by the National Natural Science Foundation of China (No. 41372356), the Basic Research and Frontier Exploration Project of Chongqing, China (cstc2018jcyjA1597), the College Cultivation Project of the National Natural Science Foundation of China (No. 2018PY30) and the Graduate Scientific Research and Innovation Foundation of Chongqing, China (No. CYS18026).
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National Natural Science Foundation of China under Grant No. 41372356, the Basic Research and Frontier Exploration Project of Chongqing, China under Grant No. cstc2018jcyjA1597, the College Cultivation Project of the National Natural Science Foundation of China under Grant No. 2018PY30 and the Graduate Scientific Research and Innovation Foundation of Chongqing, China under Grant No. CYS18026
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Deng, Z., Liu, X., Liu, Y. et al. Model test and numerical simulation on the dynamic stability of the bedding rock slope under frequent microseisms. Earthq. Eng. Eng. Vib. 19, 919–935 (2020). https://doi.org/10.1007/s11803-020-0604-8
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DOI: https://doi.org/10.1007/s11803-020-0604-8