基于ABAQUS的水平受荷桩应变楔分析

Analysis of strain wedge for laterally loaded pile based on ABAQUS

为探讨应变楔模型中基本参数的变化规律,以水平受荷单桩为研究对象,基于现有应变楔理论研究及ABAQUS有限元软件,建立三维水平受荷单桩数值模型。利用ABAQUS提供的后处理功能,通过应变等值线云图,验证应变楔的存在,并通过桩周土体单元的应变值变化情况,确定应变楔模型基本参数(应变楔长度、应变楔深度、底角及伞角)。对比分析不同水平荷载、土体内摩擦角及土体弹性模量下应变楔模型基本参数,得出一些规律性结论;并对应变楔底面曲线、底角及应变楔长度进行回归分析,得到其拟合公式。通过算例,验证本文有限元分析及拟合公式的合理性。这些分析为应变楔模型提供了新思路,有利于深化及细化对应变楔模型的认识。

This paper was presented to discuss the characteristics of basic parameters in strain wedge model.Firstly,based on existing researches about strain wedge and ABAQUS,a three-dimensional(3D)numerical model of laterally loaded single pile was established.Secondly,the existence of strain wedge was verified by post-processing functions and nephograms for isoline of strain,and basic parameters of strain wedge were determined by analyzing variations of strains for pile-surrounding soil.Then,some regular conclusions were obtained by comparing basic parameters of strain wedge under different lateral loads,internal friction angle and elasticity modulus of soil,meanwhile,the fitting formulas of the bottom curve,base angle and length of strain wedge were obtained by regressive analysis.Finally,the reasonability of 3D numerical model and fitting formulas were verified by an example,which provide a new perspective for strain wedge model.