深厚砂层超长大直径桩承载特性静载试验研究

Static load test study on bearing characteristics of ultra-long and large diameter piles in deep sand layer

针对樟树港湘江大桥深厚砂土地基下超长大直径桩的承载力开展了双荷载箱自平衡试验研究,获得单桩承载力的特征值,以及桩侧阻力随深度的分布规律,获得桩侧阻力-桩土相对位移关系曲线,端阻力-桩端位移的关系曲线。试验结果验证了施工质量的可靠性,可为桩基的优化设计提供重要参考。

This paper made the double load box self balancing test according to the bearing capacity of ultra long and large-diameter piles under deep sandy soil foundation of Zhangshugang Xiangjiang Bridge,obtained the characteristic values of single pile bearing capacity,as well as the distribution law of pile side resistance with depth,obtained the relationship curves between pile side resistance and pile-soil relative displacement,end resistance and pile end displacement.The test results verified the reliability of construction quality,provided important references for the optimization design of pile foundations.