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扩顶CFG桩复合地基是在CFG桩复合地基基础上发展的一种地基处理方法,其借鉴桩-承台-土相互作用理论,充分利用扩顶“荷载收集”作用以及桩间土的承载和变形协调能力。以河南省某高速公路为工程背景,通过有限元数值方法对常规CFG桩和扩顶CFG桩复合地基进行模拟分析,讨论不同因素对扩顶CFG桩控沉效果的影响;分析桩帽下土体的竖向位移;研究桩身应力、桩帽下土体的应力等的变化规律,并结合现场监测结果比较分析,对扩顶CFG桩数值模拟给出若干结论。
Expanded CFG pile composite foundation is a kind of foundation treatment method developed on the basis of CFG pile composite foundation. Drawing on the theory of pile-soil-pile-soil interaction, making full use of the effect of expansion and load collection and soil between piles Bearing and deformation coordination. Taking a highway in Henan Province as the engineering background, the CFD pile and CFG pile composite foundation with CFG pile and CFG pile are simulated by finite element method to discuss the influence of different factors on CFG pile sinking effect. The vertical displacement of the pile is analyzed. The variation of the pile stress and the stress of the soil under the pile cap are studied. Based on the comparative analysis of the field monitoring results, some conclusions are given.