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桩侧后注浆抗拔桩是一种新型的抗拔桩基础。借助于试验和数值手段对这种抗拔桩的承载变形特性开展了深入研究。首先进行了接触面的大型剪切试验,以揭示桩土接触面在注浆与未注浆前后其力学特性的差异性,并基于大型接触面剪切试验成果,建立了桩土接触面的修正库仑摩擦模型。将接触面模型应用到有限元数值分析,分别模拟了传统等截面抗拔桩与后注浆抗拔桩的承载变形特性。研究表明,相比传统的抗拔桩,桩侧后注浆抗拔桩的侧摩阻力得到了显著的改善,特别是深处的桩侧极限摩阻力得到了更充分的发挥,从而桩侧注浆抗拔桩的承载能力有了较大程度的提高。
Post pile grouting uplift pile is a new type of uplift pile foundation. The bearing deformation characteristics of this type of uplift piles are studied by means of experiments and numerical methods. Firstly, the large shear test of the contact surface is carried out to reveal the difference of the mechanical properties of the pile-soil contact surface before and after grouting and un-grouting. Based on the results of the large-scale contact surface shearing test, the correction of the contact surface between pile and soil is established Coulomb friction model. The contact surface model is applied to the numerical analysis of the finite element method, and the bearing deformation characteristics of the conventional section-shaped upright piles and the post-grouting upright piles are simulated respectively. The research shows that compared with the traditional anti-pull pile, the lateral friction of the post-pile grouting anti-pull pile has been significantly improved, especially in the deep side of the pile side of the ultimate friction has been more fully played, The bearing capacity of the pulp uplift piles has been greatly improved.