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通过4组土工离心模型试验,研究了山区底面倾斜的软土层CFG桩复合地基路堤破坏模式。试验模拟了4种地基:倾斜天然软基,水平CFG桩复合地基,倾斜CFG桩复合地基,以及施工有缺陷的CFG桩复合地基。试验结果表明:(1)路堤荷载作用下,CFG桩易发生多次桩体断裂,最终形成能够随软土移动的刚性短桩;(2)底面倾斜的复合地基上,CFG桩的断裂更集中在下坡方向,路堤破坏的影响范围远大于水平地基的情况;(3)缺陷CFG桩复合地基路堤变形显著增大。
Through four sets of geotechnical centrifuge model tests, the embankment failure mode of CFG pile composite foundation in soft soil inclined at the bottom of mountain is studied. The test simulated four kinds of foundations: inclined natural soft foundation, horizontal CFG pile composite foundation, inclined CFG pile composite foundation and defective CFG pile composite foundation. The results show that: (1) CFG piles tend to fracture more than one time under the load of embankment, eventually forming rigid short piles that can move with the soft soil; (2) CFG piles are more concentrated on the inclined foundation In the downhill direction, the influence range of embankment failure is much larger than that in horizontal foundation; (3) The embankment deformation of CFG pile composite foundation is obviously increased.