刚性承台下柔性桩与地基相互作用的线性分析

Linear Analysis of Interaction between Flexible Piles and Soil under Rigid Bearing Platform

对桩侧土及桩端土均采用线性荷载传递函数 ,同时考虑桩周土所分担的荷载对桩基荷载传递规律的影响 ,利用力学理论及微分方程的近似解法——子域法 ,推导出了柔性桩与地基相互作用的一套完备的解析算式 ,并讨论了桩土模量比及桩长对桩土应力比的影响 ,同时也探讨了桩土模量比对承台下单桩及桩土复合体承载力、桩侧摩阻力、桩身轴力和位移的影响。为了验证文中方法的可行性 ,作者将模型试验结果与文中计算结果进行了比较 ,对比表明 。

Based on the linear load transfer function for pile end side soil and pile end soil, considering the influence of the load shared by the pile side soil on load transfer law of piles, and using mechanics theory and approximate solution method district method of defferential equation , a set of analytical formulas for interaction between flexible piles and soil has been derived. The influence of the pile soil modulus ratio and the pile length on the pile soil stress ratio is discussed. Meanwhile the influence of the pile soil modulus ratio on the bearing capacity of pile and pile soil composite body, the friction force of pile side, the axial force and displacement of pile are discussed. To verify the reliability of the proposed method. the results of model tests are compared with the calculated results in this paper, which shows that the proposed method has good precision.