基于双曲线模型的带帽刚性桩复合地基荷载传递机制研究

Research on load transfer mechanism of composite foundation of rigid pile with cap based on hyperbolic model

假定带帽刚性桩复合地基桩土荷载传递函数为双曲线模型,对其荷载传递机制进行了非线性分析。根据文献[1]的方法,建立了桩体、桩帽下土体及桩帽间土体的竖向位移、竖向应力、界面侧摩阻力与深度之间的控制微分方程。利用微分方程近似解法,得到了相应的解析表达式。直接把桩顶沉降作为已知条件进行求解,计算结果能反映带帽刚性桩复合地基工作性状规律,可为工程设计提供理论基础。

The nonlinear analysis have been done for the load transfer mechanism of composite foundation of rigid pile with cap by assuming load-transfer function which is hyperbolic model.Based on the idea of literature[1],the controlled differential equations have been put forward for pile,soil under pile cap and soil between pile cap,including its vertical displacement,vertical stress,friction force and depth.The corresponding analytical formulas have also been derived by using the approximate solution of differential equation.Using directly the settlement of pile top as the known condition,the calculation results can image basically the work behavior rules of composite foundation of rigid pile with cap and provide the theory base for engineering design.