Abstract
There are massive landslides and potential landslides along the Three Rivers Basin in the Qinghai–Tibet Plateau, which pose a serious threat to the Sichuan–Tibet Railway. A normal shaking table model test was conducted to study the dynamic characteristics and dynamic response of a symmetrical counter-bedding rock slope based on the Zongrong Village landslide. The influences of the dynamic parameters, seismic wave type, and a weak intercalated layer on the slope’s dynamic response were considered. The results showed symmetry between the growth trend of the acceleration amplification factor and other research results. When the input wave amplitude was constant, the acceleration amplification factor increased at first and then decreased as the frequency increased. When the input frequency was near the slope’s natural frequency, the acceleration amplification factor increased at first and then decreased with an increase in the input amplitude and reached the maximum value at 0.3 g. The acceleration amplification factor increased linearly with height in the vertical direction inside the slope but increased slowly at first and then sharply along the slope surface, reaching the maximum value at the slope’s top and exhibiting an obvious “elevation effect”. When sinusoidal waves, Wolong waves, and Maoxian waves with the same amplitude were input, the slope’s amplification effect on the bedrock wave was more obvious. The weak intercalated layer showed the phenomenon of “thin layer amplification” and “thick layer attenuation” in response to the input seismic wave. The slope’s failure process can be roughly divided into three stages: (1) the formation of tensile cracks at the top and shear cracks at the toe; (2) the extension of cracks and the sliding of the slope-surface block; (3) the formation of the main sliding surface.
Highlights
Accepted: 5 January 2022The Three Rivers Basin, which spans the deeply incised southeast Tibetan Plateau and north Tibetan Plateau, is characterised by highly varied topography and climate, strong neotectonic movement, and frequent seismicity, resulting in frequent geological disasters [1].This poses a severe threat to people’s lives and properties and to the regular operation of important infrastructure projects
The results indicated that the failure modes are very different between the bedding rock slope and anti-dip rock slope
The purpose of this paper is to study the dynamic response law of a rock slope under a strong earthquake
Summary
The Three Rivers Basin, which spans the deeply incised southeast Tibetan Plateau and north Tibetan Plateau, is characterised by highly varied topography and climate, strong neotectonic movement, and frequent seismicity, resulting in frequent geological disasters [1]. Feng et al [21] used a discontinuous deformation analysis method and shaking table test to analyse the dynamic response and the failure process of a layered rock slope. Chen et al [28] studied the dynamic response and failure process of the anti-dip rock slope by a shaking table test and found that the damage of low-frequency and high-amplitude seismic waves to the slope is higher. Li et al [32] analysed a counter-bedding rock slope’s dynamic response with multiple slip surfaces, considering the effect of slope height, slope angle, and input seismic wave on the slope’s critical acceleration. Studied a slope’s dynamic stability under earthquakes by using different research methods, considering the influence of slope height, slope angle, rock-layer dip angle, and thickness. The research results help greatly in our understanding of the effect of seismic waves on slopes’ dynamic responses, as well as contributing to further discussion on slopes’ failure mechanisms and to the prevention of disasters
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