Model test and numerical simulation on the dynamic stability of the bedding rock slope under frequent microseisms
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EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION
Earthq Eng & Eng Vib (2020) 19: 919-935
October, 2020
DOI: https://doi.org/10.1007/s11803-020-0604-8
Model test and numerical simulation on the dynamic stability of the bedding rock slope under frequent microseisms Deng Zhiyun1,2†, Liu Xinrong1,2‡, Liu Yongquan1,2,3†, Liu Shulin1,2§, Han Yafeng1,2†, Liu Jinhui1,2§ and Tu Yiliang4† 1. School of Civil Engineering, Chongqing University, Chongqing 400045, China 2. National Joint Engineering Research Center for Prevention and Control of Environmental Geological Hazards in the TGR Area Chongqing University, Chongqing 400045, China 3. China Construction Underground Space Co., Ltd., Chengdu 610081, China 4. School of civil engineering, Chongqing Jiaotong University, Chongqing 400074, China
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.
Keywords: bedding rock slope; frequent microseisms; shaking table test; numerical simulation; dynamic stability; failure mode; long-term stability
1 Introduction Seismically induced failure of rock slopes is one of the most common geological hazards in mountainous regions. Landslides may cause severe traffic interruption, structural destruction and the loss of human life (Tang et al., 2009; Zhang et al., 2010; Liu et al., 2014; Tang et al., 2017). Consequently, the seismic stability of slopes under earthquake actions is one of the most considerable engineering problems in earthquake engineering (Lak et Correspondence to: Liu Xinrong, School of Civil Engineering, Chongqing University, Chongqing 400045, China Tel: +86-23-65120727; Fax: +86-23-65120728 E-mail: [email protected] † PhD Student ; ‡Profe
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