取土引孔尺寸对预制桩桩侧摩阻力的影响分析

Influence Analysis of Precast Pile Skin Friction with Drilling Hole Size

基于沉桩过程为圆孔扩张过程的假设,采用love位移函数对弹性区应力场进行求解,塑性区的土体假定为Mohr-Coulomb材料,并求解塑性区的应力场以及桩侧摩阻力,使用Matlab软件进行理论计算,讨论了不同引孔深度、引孔半径、内摩擦角及塑性区体积应变对桩侧摩阻力的影响,结果表明:随着引孔半径和深度、土的内摩擦角的增大,土体塑性区体积应变的减小,桩侧摩阻力逐渐减小。

Based on pile hole expansion process is the assumption that the use of love displacement function of elastic stress field is solved, soil plastic zone is assumed to Mohr-Coulomb material, and solving the stress field and pile friction plastic zone, using Matlab software for theoretical calculations, hole depth discussion of different primers, primer pore radius, angle of internal friction and affect the plastic zone volume strain on the pile skin friction. The results showed that： with the guide hole radius and depth of Angle of internal friction of soil increases, the decrease of the volume strain of the plastic zone of soil, pile side friction decreases.