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结合湿陷性黄土地区大直径扩底桩现场浸水载荷试验,利用PLAXIS有限元软件,在考虑湿陷性黄土湿陷变形的基础上,从桩端持力层厚度及变形模量的变化对单桩竖向承载力的影响进行了数值模拟分析,对其影响程度进行了定量计算。研究结果表明:湿陷性黄土地区,持力层临界厚度为3D(D为扩底端直径),桩端持力层变形模量的提高可以显著增加单桩竖向极限承载力,单桩极限承载力的提高主要通过桩端阻力的提高来实现,而且桩侧摩阻力对单桩极限承载力的分担也不可忽视。
Based on the field test of water immersion load of large diameter expanded pile in collapsible loess area, based on the PLAXIS finite element software, considering the deformation of collapsible loess and the change of thickness and deformation modulus, Pile vertical bearing capacity of the numerical simulation analysis, the impact of a quantitative calculation. The results show that in collapsible loess area, the critical thickness of bearing strata is 3D (D is the diameter at the bottom of straightening). The increase of deformation modulus of bearing strata at pile tip can significantly increase the vertical ultimate bearing capacity of single pile, The improvement of bearing capacity is mainly achieved through the increase of pile end resistance, and the sharing of the ultimate frictional resistance of pile with pile friction can not be neglected.