不同嵌固深度下的承台式双排抗滑桩受力分析

Platform-type Double-row Anti-slide Pile Stress Analysis under Different Embedded Depth

文章以数值模拟为研究手段,分析了嵌固深度变化对承台式双排桩前后排桩的侧向位移、内力分布及荷载分担的影响。研究结果表明:桩身的合理嵌固深度宜取桩长的1/3,此时前后排桩的荷载分担比为5.2∶4.8;抗滑桩的嵌固深度越小,桩体侧向位移越大,桩身内力会存在明显变化;作用在双排抗滑桩上的滑坡推力,在前后排桩上是按照一定比例进行分配的,而不是等分原则。建议在设计承台式双排抗滑桩时,前后排桩应按一定的荷载分担比例分别设计。

With numerical simulation as the research means,this article analyzed the impact of embedded depth changes on the lateral displacement, internal force distribution and load sharing of front and rear-row piles of platform-type double-row piles.The results showed that： the reasonable embedded depth of pile body should take 1/3 pile length,then the load sharing ratio of front and rear-row piles is 5. 2 ： 4. 8;the smaller embedded ＇depth the anti-slide pile,the more lateral displacement of pile body, and the internal force of pile body shows significant change;the landslide thrust acting on double-row anti-slide piles is allocated according to a certain percentage on front and rear row of piles, rather than the principle of equal pertions.lt is recommended that the front and rear row of piles should be designed respectively according to certain load sharing ratio when designing the platform-type doublerow anti-slide piles.