低承台复合桩基承载力计算方法研究

根据竖向荷载作用下单桩承载力计算的经验方法，通过单桩、单承台组合的低承台复合桩基在承台作用下的承载机理，以弹性理论为基础，提出低承台复合桩基承载力计算式。低承台复合桩基的模型实验、野外试验、工程实测结果与本文中的计算结果的对比表明，实测值与计算值均较接近。证明本文在考虑承台的分担荷载作用及承台效应使桩侧摩阻力、桩端阻力提高的前提下，而建立的复合桩基承载力计算方法是可行的，可供工程界应用与参考，且可大大节约工程资金，有显著的经济效益。

Methods of calculation in low capping composite pile foundation

According to the experiential method of carrying capacity calculation under the function of pile in vertical load, this paper provides a carrying capacity formula of low capping composite pile foundation through the bearing capacity principle of low capping composite pile foundation composing single pile and single pile capping under the function of pile capping. This paper also makes the comparison between the calculating result in the paper and the practical measure of the field test, practical measure of the engineering project and the model test of low capping composite pile foundation. The conclusion shows that they are comparatively close to each other, so it proves that the calculation formula of carrying capacity of the composite pile foundation, which takes the elements that it can improve the friction resistance of pile and the end-resistance of pile through the partaking of the loading function and pile capping function into the consideration, is feasible. It can not only be for the reference of the engineering project, but also save lots of capital of the project and bring the notable benefit of the economy.