低承台复合桩基承台效应分析

为了充分利用低承台复合桩基在竖向荷载作用下，承台分担荷载作用，更好地发挥桩侧摩阻力、端阻力，从而提高桩基承载力，对单桩、不同尺寸的单独承台、不同复合桩基的模型进行了压载试验．并从理论上分析了低承台复合桩基在承台的作用下桩周土受荷变化、荷载传递变化及承载力的变化，得出承台不但本身可分担荷载，而且可使桩侧摩阻力、端阻力均有提高的结论．证明了低承台复合桩基在竖向荷载作用下，承台的效应可提高的结论．证明了低承台复合桩基承载力，大有节约资金之潜力．

Analysis on effect of pile capping in low capping composite pile foundation

In order to take full advantage of the function of partaking the loading by pile capping, which functions when the low capping composite pile foundation is under the function of vertical loading, and further optimize the friction resistance of pile and end-resistance of pile so as to improve the capping capacity of high pile foundation.This paper introduces a pressure test to the single pile, whose capping is in a different size and whose model is of a different composite pile foundation. This paper analyzes the variations of the earth around the pile caused by loading, the variation of its loading transmission and the variation of bearing capacity of pile.It can be proved that the pile capping not only could share loading by itself but also could improve the lateral frictional resistance of pile and the end resistance of pile.It also could testify that when the low capping composite pile foundation is under the function of vertical loading, the effect of pile capping can improve the bearing capacity capping of high pile foundation and really has the potentiality of saving the capital.