Analysis on the example shows that in composite pile foundation piles have another unneglectable contribution, which can be considered as safety allowance in design, it is reasonable and necessary.

• 算例分析表明桩在复合桩基中的另一种不可忽视的贡献，无论只是把它当作安全储备还是考虑到设计中，都是合理和有必要的。