抗滑桩结构的土拱效应分析

Study on the Soil Arching Effect Between Anti-slide Piles

基于平面应变有限元方法,对抗滑桩加固边坡中的土拱效应进行了分析。对比分析表明,加设抗滑桩后,桩周土体的主应力方向发生了偏转,两桩附近的大主应力方向连线成半椭圆形拱状,并在桩侧附近形成应力集中区域。桩后土体离抗滑桩越远受应力迁移的影响越小,故抗滑桩的土拱效应具有一定的范围。随着桩间距的增大,桩承担的荷载比例明显减小,土拱效应减弱。至于桩间距的确切计算公式,一般需结合极限平衡分析方法进行定量计算。

Based on the plane strain finite element method,the soil arching effect between anti-slide piles used in reinforced slope has been studied in this article.It is found that the direction of the maximum principal stress of soil near piles deflected,which can be linked as a shape of elliptical shape.In the scope near piles,the stress of soil obviously migrated to anti-slide piles,and the load of piles transferred from soil become less when pile spacing become larger.In a certain degree,the formula for calculating the pile spacing of anti-slide piles with soil arching effect can be deduced with limiting equilibrium method.