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通过分析夯扩载体CFG桩扩大头的形成机理,得出了夯扩载体CFG桩的单桩竖向极限承载力标准值的经验公式,并且采用数值模拟正确地反映了夯扩载体CFG桩的承载力性状。需要指出,在数值模拟时,可通过分段线形插值的办法来确定挤密区各个土层的材料参数,结果证明此方法能够较好地反映真实情况。通过公式计算、数值模拟和现场实测结果的单桩竖向极限承载力对比分析,揭示了夯扩载体CFG桩承载力性状的基本规律,为夯扩载体CFG桩设计计算提供了依据。
Based on the analysis of the formation mechanism of CFG pile enlargement head, the empirical formula of the vertical ultimate bearing capacity of single pile compaction CFG pile is obtained, and the numerical simulation is used to correctly reflect the bearing capacity of CFG pile Force traits. It should be pointed out that in the numerical simulation, the material parameters of each soil layer in the compacted zone can be determined by piecewise linear interpolation. The results show that this method can reflect the real situation better. Comparing and analyzing the ultimate bearing capacity of single pile under formula calculation, numerical simulation and on-site test results reveals the basic rules of bearing capacity of compaction-expanding CFG pile, and provides the basis for design and calculation of CFG pile.