根据包头至树林召高速公路黄河特大桥地质勘察和试桩资料,对大桥桥址处具有典型地质状况的土体工程特性和参数进行了研究,判定场地内(河滩和河床)20m以浅的亚砂土及松散—中密状粉细砂为严重液化土,单桩承载力计算应进行折减;通过理论与实测分析,掌握了桩侧摩阻力与端阻力的发挥性状,实测桩侧摩阻力及端阻力与地质报告提供值相比总体偏安全,桩基承载力满足设计要求;并建议在桩基的设计计算过程中,深度修正系数k2的取值应比规范值小。 According to the geological survey and test-pile data of the Yellow River Super Bridge from Baotou to Shulin-Zhaoshan Expressway, the engineering characteristics and parameters of the soil with typical geological conditions at the bridge site are studied. It is concluded that the subsoil (floodplain and riverbed) Soil and loose-medium density fine sand is serious liquefiable soil, the calculation of bearing capacity of single pile should be reduced. Through theoretical and practical analysis, the performance of frictional resistance and end resistance of pile side, the measured frictional resistance of pile side and The end resistance is generally partial safety compared with the value provided by the geological report, and the bearing capacity of pile foundation meets the design requirements. It is suggested that the depth correction coefficient k2 should be smaller than the standard value during the design and calculation of pile foundation.