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基于全液压可视旋挖扩底灌注桩(AM工法扩底桩)抗压静载试验的数据建立数值分析模型,分析扩底抗压桩的竖向承载性状和影响因素。研究表明:AM工法扩底桩的抗压承载力要大于等直径桩的承载力。桩侧摩阻力随桩顶荷载的增大逐步发挥到最大值,桩身上部摩阻力发挥要早于下部摩阻力的发挥,下部摩阻力比上部摩阻力偏大,桩侧摩阻力发挥要早于扩孔部位端阻力的发挥。扩底抗压桩的承载力随桩长、桩径、扩孔直径、扩孔次数及桩身模量的增加而增大,但存在一个最佳值。
The numerical analysis model is established based on the data of the static pressure test of full hydraulic visualized expanded bottom piles (AM method expanded bottom piles) to analyze the vertical bearing properties and influencing factors of the expanded bottom piles. The results show that: the AM method of expanded pile compression load capacity is greater than the equivalent diameter pile bearing capacity. The lateral friction of pile increases to the maximum with the increase of pile top load. The upper frictional resistance of pile body exerts earlier than the lower frictional resistance. The lower frictional resistance is larger than the upper frictional resistance. Reaming part of the end of resistance to play. The bearing capacity of the expanded bottom anti-pressure pile increases with the increase of pile length, pile diameter, reaming diameter, number of reaming and pile modulus, but there is an optimum value.