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通过有限元模拟现场试验并以此设计34组对比模型,全面深入研究支盘桩承载性状,揭示内部工作机理。以相同扩径体数量的纵向对比,总结出侧阻力主要在前期发挥作用,端阻力主要在后期发挥作用,扩径体位置越深,支盘桩后期承载力越高,沉降曲线越缓;以不同扩径体数量的横向对比,发现承载力提高效率和扩径端阻力发挥效率的变化规律:扩径体数量设置过多,会使桩基承载力提高效率降低,扩径端阻力也不能正常发挥。为使经济性达到最优,建议最佳扩径体数量为2~3个,为工程设计提供参考。
Through the field experiment of finite element simulation and the comparison of 34 sets of models, a comprehensive and in-depth study of the bearing properties of the branch pile is carried out to reveal the internal working mechanism. Based on the longitudinal comparison of the same number of expanding bodies, it is concluded that the side resistance plays an important role in the early stage and the end resistance mainly works in the later stage. The deeper the expanding body is, the higher the bearing capacity of the branch pile is, It is found that the efficiency of the bearing capacity increase and the resistance of the enlarged diameter end play the regularity of efficiency: if the number of expansion bodies is set too much, the bearing capacity of the pile foundation will be reduced, the resistance of the expanded end will not be normal Play In order to optimize the economy, it is suggested that the optimum number of expansion bodies be 2 ~ 3, which can provide reference for engineering design.