基于理想坡面形态的三维边坡地震动力三量分布  

Three-quantity Distribution of 3D Slope Seismic Dynamic Action Based on Ideal Slope Surface Morphology

作　　者：何刘[1] 吴光[1] 李东亮[1] 

机构地区：[1]西南交通大学地球科学与环境工程学院,四川成都610031

出　　处：《公路交通科技》2012年第11期40-44,74,共6页Journal of Highway and Transportation Research and Development

摘　　要：为了讨论边坡坡面形态对地震边坡加速度、速度以及位移分布规律的影响,将边坡按坡面形态分为凹面坡以及凸面坡,并引入底面角的概念表述了坡面的凹凸强烈程度。通过三维数值建模,利用动力有限元计算方法计算了不同坡形和底面角对三量分布的影响。研究结果表明:在同一水平高度,其放大系数在凹面坡和凸面坡坡面中心达到最大值,并且向两侧逐渐减小,放大系数随着坡底角的增大而增大;同时,边坡坡面形态对边坡内部的三量分布影响较小,但其分布随着坡高的增高而增大。In order to investigate the influence of slope surface shape on distribution patterns of acceleration, velocity and displacement of seismic slope, according to the slope surface morphology, the slope was divided into concave slope and convex slope, and the concept of underside angle was introduced to express the unevenness degree. By 3 D numerical modeling, the influence of different slope surface shapes and underside angles on the three-quantity distribution was calculated by using dynamic finite element method. The research result indicates that （ 1 ） at the same height, the amplification factor at the center of concave slope and convex slope attends to the maximum and decreases gradually to both sides, the amplification factor increases with the increases of underside angle; （2） the influence of slope surface shape on the three-quantity distribution inside the slope is less, but the distribution scope increases with the increases if slope height.

关 键 词：道路工程 三量分布 动力有限元法 地震边坡 

分 类 号：U416.14[交通运输工程—道路与铁道工程]