下沉短桩越顶问题的有限元分析

下埋短桩是一种介于抗滑键与全长桩的一种特殊的抗滑桩,在合适的位置上采用将桩顶下沉设置较短的桩就可使边坡达到设计要求的安全系数,而桩身内力较全长桩有所降低,因此从经济角度与受力方面来看,具有良好的应用前景,但是滑体有可能沿桩顶失稳剪出,导致边坡工程失败,在应用上受到了很大的制约.现以云阳县太公沱至余家包库岸大咀段库岸滑坡工程为例,对用下埋短桩治理后是否越过抗滑短桩桩顶问题,采用了有限元强度折减法验证.

FEM Analysis of Sliding Face Crossing over Sinking Pile

The short anti-slide pile is one kind of special pile situated between the anti-slide tie and the long pile.On the suitable position,sink piles may establish the safety coefficient which the design requests.Comparing with long pile, its internal force has lowered;therefore sinking pile has good applied foreground in the economical and experiencing force aspects.But the sliding body may follow crossing over pile and lose steady shear probably,the engineering may fail.The application would be greatly restricted then.Taking the landslide in Dazu Bank in Yunyang County between Taigongtuo and Yu Jiabao Bank as an example,the Strength Reduction FEM was applied to test whether the sliding face crossed over the pile with the short sinking piles.