红粘土路堑高边坡加固效果的数值模拟  

Numerical Simulation of Reinforcement Effect of High Red Clay Cutting Slope

作　　者：方薇[1] 刘晓红[2] 

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410004 [2]湖南理工学院,湖南岳阳414000

出　　处：《公路交通科技》2012年第3期22-28,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(50778180)

摘　　要：为了评估某红粘土路堑高边坡实体工程的加固效果,采用有限差分程序Flac3D,对该红粘土路堑高边坡的加固效果进行了数值模拟,数值模拟过程严格遵循施工步骤,并考虑了不同岩土层材料属性和多种支挡结构的影响。数值分析结果表明:红粘土路堑边坡最大位移一般发生在第1级台阶顶部和坡脚桩板墙背部,失稳时边坡将主要沿着岩土层界面发生滑动。采用锚杆框架支护使坡体浅表层位移大大减小,提高了边坡中部稳定性。桩板墙是坡脚加固的有效形式,考虑到挡土板后最大水平压力和最大翘曲变形均发生在底端中部,建议在板前设置牛腿支撑。In order to evaluate the reinforcement effect of a red clay bedding slope,numerical simulation of reinforcement effect of the high red clay cutting slope was performed with Flac3D according to the construction process,considering the influence of different layers＇ material properties and different retaining structures.The result of numerical analysis shows that（1） maximum displacement generally occurs at top of the first step and back of sheet-pile retaining wall at slope toe;（2） sliding happens mainly along the interface between bedrock and red clay.Displacement of upper layer decreased significantly and slope stability increased with reinforcement of frame bolts.Sheet-pile retaining wall is an effective approach for reinforcement of slope toe.Considering that both the maximum horizontal pressure and the maximum warpage will occurr at midpoint of retaining sheet bottom,it is suggested to adopt support bracket for partial strengthening.

关 键 词：道路工程 加固效果 数值模拟 高边坡 红粘土 

分 类 号：U418.52[交通运输工程—道路与铁道工程]