基于倾斜软弱地基的填方工程特性分析

Characters of embankment on inclined weak foundation

基于有限元方法,以水平软弱地基为参考,对比分析了倾斜软弱地基上路堤分阶段填筑过程中的水平位移、竖向沉降、稳定性等参量的变化规律。分析表明:当地基倾斜时,水平位移沿倾斜面向下发展,并在下坡脚处取得最大值,这明显不同于地基水平情况下水平位移基本按中心轴对称分布的规律。倾斜软弱地基的破坏模式为沿地基倾斜方向向下滑裂破坏,其稳定性明显低于水平软弱地基。计算还表明,抗滑桩使地基体内水平位移增量大大减小,抗滑桩后方的水平位移增量急剧降低。抗滑桩约束了倾斜地基体内水平位移的发展,阻碍了路堤沿地基倾斜方向向下滑裂破坏的趋势,提高了路堤的稳定性,是一种加固倾斜软弱地基的有效方法。

Characters of lateral displacement,vertical settlement and stability of embankment on inclined weak foundation with stage construction have been studied with FEM. It is shown that the lateral displacement of inclined weak foundation distributed inclined and got its maximal value at the lower toe of embankment,which are different from that of horizontal weak foundation distinctly. The stability of embankment on inclined weak foundation is greatly less than that of horizontal weak foundation,which maybe destructed along the inclined surface of inclined weak foundation. The results also show that anti-slide piles is an effective reinforcement of inclined weak foundation,which reduced the value and increment of lateral displacement of embankment,impeded the failure of embankment along the inclined surface of inclined weak foundation,and enhanced the stability of embankment effectively.