A variation trend analysis of key controlling factors on slope dynamic response due to seismic action

作者：Cui, Fangpeng^*; Yin, Yueping; Hu, Ruilin

来源：Disaster Advances, 2012, 5(4): 51-57.

• Seismic action
• collapsing and sliding response
• key controlling factors
• the Niujuangou Landslide
• the Xinzhong Landslide
• the Donghekou Landslide

Slopes' dynamic response with different distances from the initial epicenter of the Wenchuan Earthquake due to single and combined action with regionality and spatial heterogeneity of Primary and Secondary waves is simulated by applying the Universal Distinct Element Code software. As a result, the key controlling factor and its variation trend with the increasing hypocentral distance of slope initial collapsing and sliding response due to seismic action are revealed. As far as the time consumed in the process from original slope to fractured is concerned, the slope under combined seismic action between P and S wave appears instability prior to the slope under single action of P wave. With the increasing hypocentral distance, the key controlling factor of the slope collapsing and sliding response varies from the combined seismic action between P and S wave to the single seismic action of P wave.
As for the mechanical mechanism of slope instability, coupled action between vertical and horizontal ground acceleration results in the slope dynamic response with a variation trend of key action from the vertical acceleration to the horizontal one. Finally, the initial instability originates always at slope shoulder due to seismic action in relation with the peak ground acceleration amplification effect and the variation trend of the slope mechanical parameters on its fracturing.

• 出版日期2012-10
• 单位中国科学院地质与地球物理研究所兰州油气资源研究中心; 中国矿业大学（北京）; 中国科学院地质与地球物理研究所