【摘要】 以某在建地铁线北侧斜坡坡体为研究对象，通过室内振动台试验，研究地震作用下均质粉土边坡及基覆型粉土边坡两种类型边坡的失稳发展过程、失稳模式及动力响应，并与砂土边坡进行对比，探究其失稳机理。结果表明：坡角越大，边坡失稳时的峰值加速度越小，边坡越容易失稳；坡角相同时，在地震作用下基覆型边坡更容易失稳；相较于粉土，砂土边坡强度较小，在地震作用下容易发生突发性溃滑。通过ABAQUS数值模拟发现，坡角为60°的均质粉土边坡在0.7g强震作用下，内部产生拉-剪循环内力，加速坡体裂隙开展并逐渐连通，坡体被分隔为多个区域，最后失稳破坏。在动力响应方面，两种类型边坡均表现出沿高程逐渐增大的现象。更多还原

【Abstract】 Taking the north slope of a subway line under construction as the research object, through the indoor shaking table test, the instability development process, instability mode and dynamic response of homogeneous silt slope and bedrock-overlaying silt slope under earthquake action are studied, and compared with those of sand slope to explore the instability mechanism. The results shows that the larger the slope angle is, the smaller the peak acceleration for slope instability is, and the slope instability is more likely to occur; at the same slope angle,slope instability is more likely to occur in bedrock-overlaying silt slope under earthquake action; compared with silt slope, sand slope is with less strength and sudden collapse is easy to occur under earthquake action. Through ABAQUS numerical simulation, it is found that the homogeneous silt slope with a slope angle of 60° produces tension-shear cycle internal force under a seismic load of 0.7g, which accelerates the slope cracking. The slope is thus divided into several regions, and finally becomes unstable and undergoes further damage. In terms of dynamic response, the two types of slopes show a trend of gradual increase along the elevation.更多还原