地震作用下分层土边坡加速度响应规律研究

Study on Acceleration Response Law of Layered Soil Slope Under Earthquake

自然界和工程实践中分层土边坡广泛存在,为分析其在地震作用下的动力响应规律,采用物理模型试验的方法,建立了坡角为38°的分层土边坡物理模型,研究了上层粉土下层黏土和上层黏土下层粉土两种边坡模型,在ELC波作用下坡面各测点加速度放大系数变化规律和不同地震动幅值激励下的动力响应规律。试验结果表明:随着高程的增加,峰值加速度总体呈放大特征,动力响应加速度具有高程放大效应;随着输入地震动幅值的增加,坡面加速度峰值放大系数呈现递减趋势。本研究所采用的分层土边坡物理模型试验方法,为此类边坡稳定性分析提供了一定的科学依据。

Layered soil slope exists widely in nature and engineering practice.In order to analyze the dynamic response law under seismic,this paper uses the method of physical model experiment to establish a physical model with slope angle of 38°,and analyzes the acceleration amplification coefficient of each measuring point under the effect of ELC and the dynamic response law under the motivation of different earthquake amplitudes for two slope models with the upper silt and lower clay,and the upper clay and lower silt.The results show that with the increase of elevation,the peak acceleration is generally amplified,and the dynamic response acceleration has elevation amplification effect.With the increase of the input ground motion amplitude,the slope acceleration peak amplification coefficient presents a decreasing trend.The physical model test method and data of layered soil slope adopted in this study provide certain scientific basis for the stability analysis of such slope.