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基于FLAC-3D黄土边坡地震作用下动力响应数值分析

wf(2016)

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Abstract
基于FLAC-3D有限差分软件建立一个典型的黄土边坡模型,分析地震动荷载作用下边坡的动力响应特性和动力失稳机制。边坡的水平位移图表明,地震作用下边坡坡脚位移向下,发生剪出变形,坡脚为薄弱部位;剪应变增量由坡脚逐渐向坡内、坡顶扩展,中部位置剪应变较静力作用下发生较大变化,塑性区从坡脚稍向上部位向坡体内部发展,范围增大;坡脚、坡面、坡顶和坡内等监测点的速度时程曲线表明,地震波在坡体内传播过程中具有滞后效应,同时,坡体对地震波具有临空面放大效应。
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Key words
loess slope model,FLAC-3D,earthquake vibration,dynamic response,shearing deformation,shear strain
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