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建立了扩底抗拔桩的桩侧摩阻力荷载传递的非线性模型,在试验资料的基础上改进了扩底承载力计算模型,将抗拔桩的桩土相互作用归结为一阶常微分方程组在特定边界条件约束下的定解问题,采用等步长四阶Runge-Kutta法求解微分方程组,可以一次性求出桩身内力及变形值,为抗拔桩的计算分析提供了一种切实可行的新思路。由于考虑了桩土相互作用的非线性特性,计算模型较好地反映了桩土相互作用的实际性状,计算结果与试验结果进行对比分析表明二者吻合较好,验证了本文方法的正确性,可应用于实际工程问题的分析。
Based on the experimental data, the calculation model of bearing capacity of expanded bottom is improved. The pile-soil interaction of uplift pile is reduced to first-order ordinary differential equation In this paper, by using the fourth-order Runge-Kutta method with equal steps and solving the differential equations under the constraints of certain boundary conditions, the internal forces and deformation values of the pile body can be obtained once, which provides a method for the calculation and analysis of uplift piles Practical new ideas. Considering the nonlinear characteristic of the pile-soil interaction, the calculation model reflects the actual behavior of the pile-soil interaction well. Comparing the calculated result with the test result, it shows that the two agree well with each other, which verifies the correctness of the method, Can be applied to the analysis of practical engineering problems.