单桩竖向承载力试验的有限元模拟

THE FEM SIMULATION OF VERTICAL BEARING CAPACITY TESTING OF SINGLE PILE

文中采用通用有限元程序ABAQUS对浙江某地的变电站建设中桩进行单桩竖向抗压静载试验数值模拟,得到桩的Q-s曲线和桩的受力、沉降规律。研究发现桩侧摩阻力有极限值,桩侧摩阻力从桩顶开始逐渐到达极限,这时桩的Q-s曲线进入非线性阶段。在Q-s曲线的线性阶段,桩的荷载主要由侧摩阻力抵抗,进入非线性阶段后桩端阻力才开始发挥更大作用。通过研究发现文中采用的有限元模型能够有效的模拟单桩静载试验。为以后的工程设计和研究提供一些借鉴。

The finite element software ABAQUS is used to simulate the static load test of a single pile under axial compression during a substation construction in Zhejiang.The Q-s curve,the force and settlement regularity of the pile are obtained.It is found that there is a limit value of the shaft frictional resistance of the pile which is gradually reached from the top of the pile.Meanwhile,the Q-s curve of the pile enters the nonlinear stage.In the linear stage of the Q-s curve,the pile load is mainly resisted by the shaft frictional resistance while the tip resistance of the pile begins to play a greater role after entering the nonlinear stage.The resultsshow that the finite element model adopted can effectively simulate the static load test of a single pile.The study in this paper is expected to be referred for future related engineering design and research.