DX桩作为变截面桩型的典型代表，具有与普通直孔灌注桩不同的荷载传递机理，使桩基的承载力大大提高，沉降变形显著减小。多点支承的特点使得DX桩的沉降机理变得十分复杂，计算分析困难。通过对DX单桩沉降的实例分析，对DX桩与直孔桩的沉降特性进行对比，验证了设计规程中DX桩的沉降计算公式和修正系数的可靠性。

DX pile which is typical varied cross-section pile has a different load transfer mechanism compared to straight pile. The bearing capacity of the pile is increased, while the settlement is significantly reduced at the same time. The characteristic of multi-pivot bearing makes the settlement mechanism very complicated and hard to calculate. This paper compares the settlement characteristics of DX pile and straight pile on the basis of lots of projects to verify the DX pile settlement formula and the reliability of correction factor.

唐松涛（1984—），男，四川成都市人，博士研究生，主要从事桩基工程方面的研究