Upper bound analysis of seismic permanent displacement of soil slopes based on horizontal and vertical acceleration time-history curves
Wang Zhibin , Tang Zuping , Zhao Lianheng
,
Cheng Xiao
DOI:10.11835/j.issn.1674-4764.2016.02.005
Received November 18, 2014,Revised , Accepted , Available online May 10, 2016
Volume ,2016,Pages 35-43
- Abstract
The dynamic stability of slopes is influenced by the horizontal and vertical earthquake forces. The traditional method of calculating the seismic permanent displacement does not take enough consideration about the vertical seismic effect. However, considering the combined effect of horizontal and vertical accelerations is more accord with the engineering practice. Based on the upper bound limit analysis and the model of Newmark's rigid-plastic block, an approach for evaluating the permanent displacement of slopes based on the actual horizontal and vertical earthquake acceleration time-history curves is proposed. Three types of engineering slopes are studied to discuss the impact of two typical earthquake ground motions on seismic permanent displacement. The results show that: this method is compatible with the previous method without considering the vertical acceleration; the combined effect of horizontal and vertical accelerations is different for various earthquake records, and the influence of vertical acceleration on the permanent slope displacement cannot be ignored.