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NUMERICAL SIMULATION ON THE REINFORCING EFFECT OF THE TOP-EXTEBDED CFG PILE COMPOSITE FOUNDATION
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摘要: 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。Abstract: The top-extended CFG pile composite foundation is a ground treatment technique based on CFG pile foundation.It can make full use of the load collecting function of top-extended piles,and the bearing capacity and the deformation compatibility of soil between piles,which takes advantage of the pile-platform-soil interaction.Taking a highway in Henan Province as the engineering background and study object.Common CFG pile and top-extended CFG-pile composite foundation were analyzed by finite element numerical method,and various factors to the effect on settlement-controlling were discussed.The vertical displacement of the soil under the pile cap were analyzed,and the changing law of stress along the pile and vertical stress of the soil under the pile cap were studied.According to the analysis of the on-site monitoring data,some useful conclusions of the numerical simulation of the top-extended CFG pile were obtained.
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Key words:
- top-extended CFG pile /
- composite foundation /
- numerical simulation /
- monitoring data
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