Predictive model for seismic displacements of flexible sliding block subjected to near-fault pulse-like ground motions: Fid-Bau Portal

Predictive model for seismic displacements of flexible sliding block subjected to near-fault pulse-like ground motions

Xiang, Chenlin / Zhang, Yingbin / Huang, Dongliang / Ueda, Kyohei / Fu, Haiying / Liu, Jing / Zhao, Lianheng

Abstract A post investigation of landslides induced by strong earthquake events in recent years shows that near-fault pulse-like ground motions have a considerable impact on slopes. Accurate evaluation of the stability of slopes under near-fault earthquakes has become a crucial issue in seismic-prone areas. Permanent displacement is widely recognized as an effective index for evaluating the stability of slope. Based on the coupled analysis, an empirical earthquake-induced permanent displacement prediction model was developed. A displacement database of 318 pulse-like ground motions from 50 earthquake events was established. The proposed predictive model is a function of the maximum seismic coefficient-time history (k max), maximum velocity coefficient of velocity-time history of the k-time history (k v-max), yield acceleration (k y), and period ratio (ratio of the natural period of the slope to the mean period of input motion, T s/T m). The dynamic responses (k max and k v-max) are represented by two different functions. At small period ratios (T s/T m≤1.8), it is a function of peak ground acceleration (PGA), peak ground velocity (PGV) and k y. At large period ratios (T s/T m > 1.8), it is a function of PGV, T s and k y. It successfully captured the velocity pulse and long period characteristics of pulse-like ground motions. Compared to the existing model, it is found that the model is more accurate when considering pulse-like ground motions. This prediction model can be used not only for the preliminary evaluation of slope stability but also for probabilistic seismic demand analysis of flexible slopes considering pulse-like ground motion in near-fault regions.

Highlights • A permanent displacement prediction model for flexible slopes considering pulse-like ground motion is proposed. • The proposed model can capture the velocity pulse and long period characteristics of pulse-like ground motions. • The proposed model can be used for probabilistic seismic demand analyses for slopes in the near-fault region.