螺旋桩室内模型试验设计及结果分析

曲线螺旋桩是一种施工速度快、环境污染低、成桩质量高的新型抗拔桩,在公路、建筑等各类地基工程中应用广泛。具有增大桩土间接触面、提高桩侧摩阻力、增强桩身抗拔承载力的作用。为进一步了解螺旋桩的抗拔承载机理,该文采取室内模型试验方法,对不同螺旋宽度及厚度的曲线螺旋桩展开模拟试验,分别监测不同抗拔荷载作用下各组模型的上拔位移量、桩身轴力、侧摩阻力及桩周土压力变化,进而分析出上拔荷载作用下螺旋宽度、螺旋厚度对桩身承载力发挥机理所产生的影响,总结出螺旋宽度是抗拔承载机理主要影响因素的结论,旨在为地基工程中曲线螺旋桩的科学应用提供参考。

Curved spiral pile is a new type of anti-pull pile with fast construction speed,low environmental pollution and high pile quality.It is widely used in highway,construction and other foundation projects.It can increase the indirect contact surface of pile and soil,increase the friction of pile side and enhance the uplift bearing capacity of pile.In order to further understand the pull-out bearing mechanism of spiral pile,the indoor model test method is adopted to carry out simulation tests on curved spiral piles with different spiral width and thickness.The uplift displacement,axial force,lateral friction and soil pressure around the pile are monitored respectively under different pull-out loads.Furthermore,the influence of spiral width and spiral thickness on the bearing mechanism of pile under uplift load is analyzed,and the conclusion that spiral width is the main influence factor of uplift bearing mechanism is summarized in order to provide reference for the scientific application of curved spiral pile in foundation engineering.