DX桩以其单桩承载力高沉降量小的优点，在一般工业与民用建筑中得到了比较广泛的应用。最近一些桥梁工程也采用了这种新型桩技术。以北京市某桥梁工程为实例，通过试桩抗压静荷载试验，得出单桩竖向抗压承载力试验值，并且从单桩竖向抗压承载力、桩沉降量方面与直孔桩作了比较，还简单地分析了DX桩在受到竖向荷载作用时轴力沿桩身的分布情况以及在加载过程中DX桩上下盘盘阻的变化情况。

DX pile is a new type of variable cross-section pile developed from last decades. This pile has been applied in many foundations of buildings for its great advantage of high bearing capacity and low settlement. Nowadays some foundations of bridges of highway road have adopted DX pile. A case of DX pile in Beijing was analyzed in this paper. Two DX piles and one straight pile were tested by static loading method. The vertical bearing capacity and Q-s curves were obtained. The settlements of different piles were also compared. The axial force along the shaft of DX pile was listed and the effects of bearing capacity of bells were analyzed.

张德华（1972—），女，山西朔州市人，北京交通大学副教授，博士，主要从事隧道工程研究工作