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压扩多支盘灌注桩是在挤扩支盘扩孔灌注桩的基础上改进而来的一种新桩型,是将静压桩、沉管灌注桩、扩底桩和多支盘灌注桩的多种优点集于一体的新型桩基技术。压扩支盘桩具有承载力高、沉降小、经济性好的优点。利用ANSYS有限元分析软件对竖向受压时的二支盘压扩支盘桩进行数值模拟,得出了竖向荷载下侧摩阻力和桩端阻力的变化规律。桩的多个支盘构成了多支点摩擦端承桩,竖向荷载主要由承力盘承受,上支盘受力大于下支盘受力。提出了压扩支盘桩的支盘竖向临界间距、布桩最小间距的建议值。
Pressure expanding multi-support cast-in-place piles are a new type of piles improved on the basis of the expanded-expanded piles. The static pressure piles, immersed piles, expanded piles and multi-branch cast-in-situ piles A variety of advantages set in one of the new pile technology. Compaction branch pile has the advantages of high bearing capacity, small settlement and good economy. The finite element analysis software ANSYS was used to simulate the pressure-bearing branch pile under vertical compression, and the variation rule of friction and pile resistance under vertical load was obtained. A plurality of fulcrums of the pile form a multi-fulcrum friction bearing pile, and the vertical load is mainly borne by the bearing plate. The stress of the upper support plate is greater than that of the lower support plate. The proposed value of the vertical critical spacing of piles of compaction branch-supported piles and the minimum spacing of piles is proposed.