Study on the Dynamic Response and Damage Mode of Base-covered Slopes under Seismic Action
In order to investigate the dynamic response characteristics,damage modes and the influence of base-cover interface inclination angle of a base-cover slope in the southwest mountainous area,FLAC 3D software is used to simulate the response process of base-cover slope under seismic action,and to analyze the dynamic response and damage modes of the slope under different seismic actions,and then to further change the inclination angle of the base-cover interface,and to analyze the effect of the inclination angle on the dynamic response characteristics and the damage modes.On this basis,we further change the inclination angle of the upper and lower interfaces of the base-cover interface to analyze the influence of the inclination angle of the base-cover interface on the dynamic response characteristics and damage mode.The results show that the PGA amplification coefficient of the slope of bedrock and overburden layer increases and then decreases with the increase of ELevation,and the dynamic response of the internal slope body shows a clear pattern of ELevation effect and surface effect,and decreases with the increase of input PGA.The maximum displacement of the slope surface is 228.1 cm and 446.2 cm when loading EL and Kobe waves with PGA=0.6g.The accELeration response and displacement response of the model are more intense when loading Kobe waves than when loading EL waves.The slope damage mode gradually changes from overall slip damage to local slip damage as the difference between the upper and lower interface inclination increases,the slope failure mode gradually transitions from overall slip failure to local slip failure,and the greater the difference,the higher the slope stability.
the slope of bedrock and overburden layerearthquakenumerical calculationdynamic responsefailure modeinterface dip
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