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大直径扩底桩,其承载性状的影响因素较多,本文依托某工程三根大直径扩底桩现场浸水载荷试验,分析了自重湿陷性黄土浸水湿陷后大直径扩底桩的承载性状。试验结果表明:浸水湿陷后桩身轴力最大值出现在中性点处,桩侧负摩阻力的产生具有一定的时间效应;增加持力层厚度可以有效地提高单桩竖向承载力;尽管有负摩阻力的影响,但桩侧摩阻力分担的桩顶荷载依然不可忽视。
In this paper, based on the on-site water-immersion load test of three large-diameter expanded pegs, the bearing behavior of large diameter pedestal with collapsed collapsible loess subsided after wet soaking is analyzed. The experimental results show that the maximum axial force of pile after water immersion collapses appears at the neutral point, and the generation of negative skin friction on pile side has a certain time effect. Increasing the thickness of bearing layer can effectively increase the vertical bearing capacity of single pile. Despite the influence of negative skin friction, the pile top load shared by pile friction can not be neglected.