Abstract

The Winkler foundation model is widely used in soil calculation for the analysis of buckling failure of super-long piles. The model regards the foundation soil as an elastic body composed of discrete spring elements with the continuity of the foundation soil ignored, which is inconsistent with the actual engineering. In this paper, the double-parameter foundation model which conforms to the actual deformation characteristics of soil is introduced. The model uses two independent parameters to reflect the characteristics of the foundation soil, and the shearing effect between the soil springs is considered to reflect the continuity of foundation soil. Based on this, the total potential energy function of the pile-soil system is established. According to the principle of stationary potential energy and the variational method, the analytical solution of the buckling critical load of the pile foundation can be calculated by the m-method and the combination method respectively. The results of the example show that the error between the calculated method and the test piles is within 5%, which indicates that the double-parameter can accurately reflect the reaction behavior of the foundation soil during the buckling failure of super-long pile in the actual engineering. Meanwhile, the soil resistance model of the combination method is closer to the actual pile body constraint.

摘要

Winkler基础模型广泛用于土体计算，用于分析超长桩的屈曲破坏。该模型将地基土视为由离散弹簧单元组成的弹性体，忽略了地基土的连续性，与实际工程不符。本文介绍了符合土体实际变形特征的双参数地基模型。该模型使用两个独立的参数来反映地基土的特性，并考虑土弹簧之间的剪切效应来反映地基土的连续性。在此基础上，建立桩土系统的总势能函数。根据定势能原理和变分法，桩基屈曲临界荷载的解析解可分别采用m法和组合法计算。算例结果表明，计算方法与试验桩的误差在5%以内，说明该双参数能准确反映超长桩屈曲破坏过程中地基土的反应行为。实际工程。同时，组合法的土体阻力模型更接近实际桩身约束。表明双参数在实际工程中能准确反映超长桩屈曲破坏过程中地基土的反作用力。同时，组合法的土体阻力模型更接近实际桩身约束。表明双参数在实际工程中能准确反映超长桩屈曲破坏过程中地基土的反作用力。同时，组合法的土体阻力模型更接近实际桩身约束。