桩承式加筋路堤关键问题研究

Research on Key Problems of Pile-supported Reinforced Embankment

利用弹塑性有限元方法研究了桩承式加筋路堤应用中的几个关键问题,包括桩承式路堤的沉降组成和分布规律、适用条件、荷载分担比的影响因素等。具体研究了未打穿软土层情况下不同路堤高度时的路堤沉降规律,在打穿和未打穿2种情况下荷载分担比随桩托板尺寸、桩间距、路堤高度等因素的变化规律及土工格栅的作用。结果表明:路堤沉降主要取决于桩端以下软土层的压缩;荷载分担比随桩托板尺寸和路堤高度的增加而增大,随桩间距的增加而减小;土工格栅对荷载分担比和路堤沉降影响都不大。

Several key problems of pile-supported reinforced embankment were studied by elasticplastic finite element method, including the composition and distribution rule of the settlement, the applicable situation and the influence factors of pile efficacy. The settlement rule of embankment at unembedded soft layer with different heights, the rules of pile efficacy changing with slab size, pile spacing, embankment height at embedded in soft layer or not and the effect of geogrid were analyzed. The results show that settlement of embankment is mainly determined by compression of the substratum; pile efficacy increases with increase of size and embankment height, and decreases with increase of pile spacing; geogrid has no significant impact on pile efficacy and the embankment settlement.