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通过有限差分软件FLAC3D建立高速公路软基段数值模型,分别改变CFG桩的桩间距及褥垫层厚度,分析桩土应力比变化规律,结果表明:(1)随着垫层厚度增大,桩土应力比逐渐减小,可将褥垫层厚度设置为40cm;(2)随着桩间距的增大,桩土应力比逐渐增大。得到的结果可为CFG桩加固该地区高速公路软基设计提供参考。
The finite element software FLAC3D was used to establish the numerical model of soft ground section of expressway. The pile spacing and thickness of CFG pile were changed respectively, and the change law of pile-soil stress ratio was analyzed. The results showed that: (1) With the increase of cushion thickness, Soil stress ratio is gradually reduced, the cushion thickness can be set to 40cm; (2) With the increase of pile spacing, pile-soil stress ratio increases gradually. The obtained results can provide a reference for CFG pile to reinforce the design of expressway soft foundation in this area.