为研究黄泛区大直径超长桩的承载性状、桩身轴力、侧摩阻力及端阻力的发挥性能,对黄泛区桥梁超长钻孔灌注桩进行单桩静载试验。试桩结果表明:黄泛区大直径超长钻孔灌注桩的Q-s曲线呈缓变型,在极限荷载作用时仍未达到破坏状态,试桩极限承载力远大于地质报告计算值;在设计荷载下,桩顶荷载完全由桩侧摩阻力承担,桩顶沉降完全来自于桩身压缩。在进行超长桩设计时,需考虑桩身质量的影响。黄泛区试桩桩身轴力的传递规律及桩侧摩阻力的发挥与软土地区有所不同,其与桩周土层特性及埋深等密切相关。桩侧摩阻力对摩擦桩承载力影响较大,测试极限侧摩阻力与残余侧摩阻力均处于规范推荐范围的高值区间或大于规范推荐值,反映出黄泛区超长钻孔灌注桩具有较高的承载能力。同时,桩侧摩阻力与桩端阻力非同步发挥,建议在设计时适当考虑桩端阻力。 In order to study the bearing behavior, the axial force of the shaft, the lateral frictional resistance and the end resistance performance of the large-diameter super-long pile in the Yellow River, the static load test of single-pile in the ultra-long bored piles of the Huanghe River is carried out. The test results show that the Qs curve of the large-diameter extra-long cast-in-site bored pile in the Yellow River is slowly changing type, and the failure state is still not reached under the ultimate load. The ultimate bearing capacity of the test pile is much larger than the calculated value of the geological report. , Pile top load completely by the pile side friction resistance, pile top settlement from the pile body compression. In the design of extra long piles, need to consider the impact of pile quality. The transfer law of pile axial force and the frictional resistance of pile side in the Yellow River are different from the soft soil area, which is closely related to the soil characteristics and depth of the pile. Pile lateral friction has a great influence on the bearing capacity of the friction pile. The test ultimate friction and the residual friction are both within the recommended range or higher than the recommended values, reflecting that the over-long bored piles have a Higher carrying capacity. At the same time, pile side friction and pile end resistance are not synchronized to play, it is recommended to consider the design of the pile end resistance.