开展了柔性长短桩组合型复合地基和传统的等长桩复合地基2组离心模型试验，研究路堤荷载下柔性长短桩组合型复合地基的加固机理。试验中路堤表面关键点处设置位移计，布设分层沉降标示点，在土层不同深度处埋置孔压传感器和土压传感器等。试验结果表明：长短桩组合型复合地基中长桩的桩土应力比明显增大，并且在总桩长相同的条件下比等长桩复合地基更利于控制总沉降和侧向位移。

Two centrifuge model tests were carried out to study the mechanism of reinforcing composite foundation with flexible non-uniform piles under embankment load. One centrifuge model is with non-uniform piles (new type embankment), and the other with piles of equal length (traditional embankment). Several miniature pore pressure transducers (PPTs) and earth pressure transducers (EPTs) were installed in different depths of earth in the tests. Displacement sensors were arranged at key points on the embankment surface. The results obtained from the two centrifuge tests showed that the pile-soil stress ratio of longer piles in the new type embankment increased remarkably. When the total length of non-uniform piles was equal to that of uniform piles, the new type embankment had a less total settlement than traditional embankment at the top of the piles. Furthermore, the lateral settlements of this new type embankment were less than those of the traditional embankment.