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基于大型有限元ABAQUS软件对桩土本构模型的数值分析,对某扩底桩进行模拟,清晰地反映出桩的上拔荷载传递机制,及桩体的简易破坏模式:桩下端沿着桩底扩大头直径的圆柱体接触面发生剪切破坏,桩体中部以上滑动面破坏形式呈倒锥台型。模拟结果表明,在桩体未达到极限承载力时,桩土间发生侧摩阻力能够抵制上拔荷载,当达到承载临界状态时,桩体扩大头部分承担极大地压缩应力。由此表明,在软件模拟扩底桩的上拔过程中,将桩土物理参数数值化能够得到其相应的理论破坏模式。
Based on the numerical analysis of the constitutive model of pile-soil with ABAQUS, the finite element method is used to simulate the pile-soil model. The uploading load transfer mechanism of the pile and the simple failure mode of pile body are clearly reflected. The contact surface of the cylinder which enlarges the diameter of the head is sheared and destroyed, and the failure form of the sliding surface above the middle of the pile is inverted cone type. The simulation results show that when the pile body does not reach the ultimate bearing capacity, the lateral friction between the pile and the soil can resist the uplift load. When the load-bearing critical state is reached, the enlarged head part of the pile body will bear the extremely compressive stress. Therefore, it is shown that in the process of uplift of software-simulated pedestal pile, the corresponding theoretical failure modes can be obtained by numericalizing the pile-soil physical parameters.