Vol16 No.6: 1244-1257
【Title】Permanent displacement models of earthquake-induced landslides considering near-fault pulse-like ground motions
【Author】ZHANG Ying-bin1,2,3*; XIANG Chen-lin3; CHEN Yan-long2; CHENGQian-gong4; XIAO Li3; YU Peng-cheng3*; CHANG Zhi-wang3
【Addresses】1 Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China; 2 State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China; 3 Department of Geotechnical Engineering, School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China; 4 Department of Geological Engineering, Southwest Jiaotong University, Chengdu 610031, China
【Corresponding author】ZHANG Ying-bin
【Citation】Zhang YB, Xiang CL, Chen YL, et al. (2019) Permanent displacement models of earthquake-induced landslides considering near-fault pulse-like ground motions. Journal of Mountain Science 16(6). https://doi.org/10.1007/s11629-018-5067-2
【Abstract】The permanent displacement of seismic slopes can be regarded as an effective criterion for stability estimation. This paper studied the characteristics of permanent displacements induced by velocity pulse-like ground motions and developed an empirical model to readily evaluate the stability of seismic slopes in a near-fault region. We identified 264 velocity pulse-like ground motions from the Next Generation Attenuation (NGA) database using the latest improved energy-based approach. All selected ground motions were rotated to the orientation of the strongest observed pulse for considering the directivity of the pulse effect, so that the most dangerous condition for slopes was considered. The results show the velocity pulse-like ground motions have a much more significant effect on permanent displacement of slopes than non-pulse-like ground motions. A regression model based on a function of peak ground velocity (PGV), peak ground acceleration (PGA) and critical acceleration (ac), was generated. A significant difference was found by comparing the presented model with classical models from literatures. This model can be used to evaluate the seismic slope stability considering the effects of near-fault pulse-like characteristics.
【Keywords】Seismic slope; Permanent displacement; Pulse effect; Earthquake-induced landslides; Near-fault