Numerical investigation of dynamic response and rupture properties of rock slopes subjected to earthquake triggering  

作　　者：MA Ke JIANG Zhengchun LIAO Zhiyi GAO Zhiliang WANG Longjiang KE Hu 

机构地区：[1]State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China [2]Institute of Rock Instability and Seismicity Research,Dalian University of Technology,Dalian 116024,China [3]Dadu River Reservoir&Dam Management Centre,CHN Energy,Chengdu 610095,China

出　　处：《Journal of Mountain Science》2025年第2期710-728,共19页山地科学学报(英文)

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.52274075,42122052,52379098)。

摘　　要：Landslides triggered by seismic activity have led to substantial human and economic losses.Nevertheless,the fundamental physical mechanisms underlying the vibration and rupture of rock slopes during earthquakes remain poorly understood.In this study,finite element method-based numerical simulations were conducted based on the rock slope at Dagangshan Hydropower Station in Sichuan province,China.Firstly,systematic analysis in both the time and frequency domains were performed to examine the seismic dynamic characteristics of the slope.Subsequently,the transfer function method and the multiple stepwise linear regression method were employed to clarify the underlying mechanism and determine critical factors influencing the slope instability during earthquakes.Time-domain analysis reveals that rock slope dynamic response exhibits notable elevation,surface,and local amplification effects.Specifically,the Peak Ground Acceleration(PGA)amplification coefficient(MPGA)is significantly higher at elevated locations,near the slope surface and in areas with protrusions.Moreover,the existence of fracture zones and anti-shear galleries minimally influences the dynamic responses but considerably affect the rupture.Specifically,fracture zones exacerbate rupture,while anti-shear galleries mitigate it.Frequency-domain analysis indicates that the dynamic responses of the slope are closely correlated with the degree of slope rupture.As earthquake magnitude increases,the rupture degree of the slope intensifies,and the dominant frequency of the response within the slope decreases,e.g.,its value shifts from 3.63 to 2.75 Hz at measurement point 9near the slope surface.The transfer function of rock slope,calculated under the excitation of wide flat spectrum white noise can reflect the interrelationships between the inherent properties and the rupture degree.Notably,the peak of the transfer function undergoes inversion as the degree of rupture increases.Furthermore,through multiple stepwise linear regression analysis,four key factors influe

关 键 词：Numerical simulation Rock slope Earthquake trigger Dynamic response Rupture properties 

分 类 号：P315.9[天文地球—地震学] TU45[天文地球—固体地球物理学]