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假定桩土荷载传递函数为双曲线模型,分析T型刚性桩荷载传递机制,建立桩及桩帽下土体的竖向位移、竖向应力、侧摩阻力与深度之间的控制微分方程。采用微分方程近似解法,推导出相应的解析表达式。利用桩顶沉降作为已知条件进行求解,所得结果能够出反映T型桩荷载传递性状规律,即桩身轴力随深度增加而减小;桩身侧摩阻力随深度增加呈现出先增大后减小;桩土应力比与荷载有关。文中方法的计算值更接近于试验结果,可为工程设计提供理论基础。
Assuming that the load-transfer function of pile-soil is hyperbolic model, the load-transfer mechanism of T-type rigid pile is analyzed and the governing differential equations between vertical displacement, vertical stress, lateral friction and depth of soil under pile and pile cap are established. Using the approximate solution of differential equation, the corresponding analytical expressions are deduced. Using the settlement of the top of the pile as a known condition, the results obtained can reflect the law of load transfer of the T-pile, that is, the axial force of the pile decreases with the increase of the depth. The friction resistance of the pile body increases firstly and then decreases with the increase of the depth Small; pile-soil stress ratio and load. The calculated value of the method in this paper is closer to the experimental result, which can provide the theoretical basis for engineering design.