嵌岩和摩擦端承超长桩有限元分析

结合工程实际,对超长嵌岩桩和摩擦端承桩进行了有限元建模分析,桩采用弹性本构关系,土体采用摩尔库伦弹塑性本构关系,得到桩的Q-s曲线。重点分析了桩身的轴力和桩侧阻力的分布情况,研究了桩和土体的接触摩擦属性对超长嵌岩桩和摩擦端承桩受力性能的影响。分析结果表明,桩的长径比为75时,桩和土体之间无论有无滑移,桩侧阻力均呈三角形分布,桩和土体的接触摩擦属性主要影响桩侧阻力三角形分布的峰值大小和位置。

FEM Analysis of Super-long Rock-socketed Pile and Friction and End-bearing Pile

The finite element analysis(FEM) of the super-long rock-socketed pile and the friction and endbearing pile are carried out based on the engineering practice. The elastic constitutive relation is adopted in the pile while the Mohr Coulomb elastoplastic constitutive relation is adopted in the soil to obtain the Q-s curve of the pile. The paper analyzes the distribution of the axial force and pole-side resistance and investigates the influence of the property of friction between the pile and soil on the mechanical behaviour of the super-long rock-socketed pile and the frictional end-bearing pile. It turns out that when the length-diameter ratio of the pile is around 75, the pole-side resistance distribution is triangular whether there is a slip between the pile and soil. The property of friction between the pile and soil largely affects the peak value and location of the triangular distribution of pole-side resistance.