Shaking table test on dynamic response of anti-dip rock slope with weak interlayers under seismic loading
ZOU Qijun1, 2,WU Ruian1, 3, GUO Changbao1, 3, ZHONG Ning1, 3, YANG Zhihua1, 3
(1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China; 2. Faculty of Engineering, China University of Geosciences, Wuhan, Hubei 430074, China; 3. Key Laboratory of Active Tectonics and Geological Safety,
Ministry of Natural Resources, Beijing 100081, China)
Abstract：The southwestern mountainous region of China is tectonically active and characterized by high, steep anti-dip rock slopes with weak intercalations. Under seismic action, the dynamic response characteristics of these slopes are complex, and the mechanisms of deformation and damage remain unclear, hindering effective disaster risk prevention and control. Based on extensive investigations of high and steep slopes in the upper reaches of the Jinsha River, a conceptual geological model is developed. It examines the dynamic response characteristics and deformation failure of the slopes under varying conditions of peak ground acceleration(PGA), seismic wave frequency, and loading direction through large-scale shaking table model tests. The results indicate pronounced nonlinear dynamic response characteristics of weak interlayer anti-dip rock slopes under seismic action, exhibiting significant height and surface effects. As the PGA increases, these two dynamic amplification effects become more prominent. The vertical dynamic response of slopes within the range of 1/3h to 2/3h demonstrates a surface effect when subjected to sinusoidal waves. As the frequency of sinusoidal waves increases, the region exhibiting a greater dynamic response gradually shifts from 1/3h to 2/3h towards the foot of the slope. When PGA≥0.4 g, under the action of a 2 Hz sinusoidal wave, the dynamic response in the damage area at the top of the slope shows signs of decay. Under the influence of the Wenchuan wave, the horizontal dynamic response at the slope's top and surface is significantly weaker than the vertical dynamic response. However, under the effect of high peak ground acceleration(PGA≥0.4 g) seismic waves, an opposing pattern is observed. The vertical dynamic response in the upper range of 1/2h to 5/6h of the slope is stronger when loading occurs simultaneously in the x and z directions compared to loading the Wenchuan wave solely in the x direction. The deformation and failure process of the slope model can be categorized into five stages: the tiny damage stage, the cracking stage at the slope top, the failure stage at the slope shoulder, the evolution stage of the sliding surface, and the instability stage of the sliding surface. Shaking table test on dynamic response of anti-dip rock slope with weak interlayers under seismic loading
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