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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。
Assuming that the load-transfer function of pile-soil with rigid-capped composite foundation is a hyperbolic model, the load transfer mechanism is analyzed nonlinearly. According to the method of literature [1], the governing differential equation between vertical displacement, vertical stress and friction between the interface side and the depth of the soil under pile cap and pile cap is established. Using the approximate solution of differential equation, the corresponding analytical expressions are obtained. The settlement of the top of the pile is directly solved as a known condition. The calculation result can reflect the working law of the rigid foundation with the pile cap and provide the theoretical basis for engineering design.