基于NL法的水平受荷桩非线性有限元分析

NL法是在总结国内外多种计算方法的基础上，依据大量桩基水平静载荷实测资料提出的一种新的桩基水平承载力非线性计算方法，并被港工桩基规范列为主要计算方法。但由于非线性计算的复杂性，因而限制了该方法的推广应用。通过将NL法与有限元法相结合，探讨了水平承载桩非线性受力特性分析的简捷、精确方法。该方法引入非线性弹簧模拟桩间土对桩单元的水平抗力，建立了基于NL法的桩土相互作用的接触非线性有限元模型。实例分析表明：计算结果与实测结果及规范中结果具有良好的一致性，可用来分析相似原理不能计算的问题，便于工程设计应用。

Nonlinear Finite Element Analysis of Piles Under Lateral Load Based on NL Method

The NL method is a new nonlinear method for calculating the lateral bearing capacity of piles,summarizing several methods at home and abroad and basing on a great number of measured values,which is one of the major computational methods by the code for marine pile foundation.The broad application of this calculation method has been restricted due to the complicity of nonlinear calculation method.By integrating NL method with FEM,a simple and accurate method for analyzing the nonlinear stress characteristics of piles under lateral load is investigated.By introducing nonlinear springs to simulate the soil's lateral antiforce to piles,the contact nonlinear finite element model based on NL method is established for pile-soil interaction.The real case analyzing result reveals that the calculated values are in good agreement with the measured values,showing that the method is highly effective and practical in projects.