倾斜软土CFG桩复合地基上的路堤破坏模式研究

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。

Failure mechanisms of embankment on inclined soft foundation reinforced by CFG Piles

Four groups of centrifugal model tests are performed to investigate the failure mechanisms of embankment on inclined soft foundation reinforced by CFG piles. The tests simulate four kinds of grounds: natural inclined soft ground, normal CFG composite ground, inclined CFG composite ground, and inclined defect CFG composite ground. The results show that the failure mechanisms are as follows: (1) CFG piles are prone to fracture into many rigid short piles moving with soil failure; (2) For the inclined ground, fractures of CFG piles occur more greatly along the downhill direction, and the deformation is larger; (3) For the defect CFG pile composite ground, the deformation is significantly larger.