兰旗松花江特大桥钻孔灌注桩自平衡试桩研究

在兰旗松花江特大桥航道主墩工程中, 采用直径2 m、长50 m的钻孔灌注桩为基础, 对桩基承载力进行了自平衡测试。选取其中5-1#、6-2#、6-3#试桩实验数据, 从荷载-沉降关系、桩的侧摩阻力分布、桩-土间相对位移关系及端阻力的发挥等方面, 分析了大直径中长灌注桩的承载特性和荷载传递机理以及影响其承载特性的因素。结果表明: 5-1#桩极限承载力为68 917 kN, 6-2#桩极限承载力为62 316 kN, 6-3#桩极限承载力为75 234 kN。

Bored piles self-balancing test of Songhua River super large bridge in Lanqi

In construction of the main pier of Songhua River super large bridge channel in Lanqi, the bored pile with 2 m in diameter by 50 m long is used as base for self-balancing testing the bearing capacity of pile foundation. Collecting the experimental data of 5-1#, 6-2#, 6-3# test piles, the authors analyze the bearing characteristics and load transfermechanism of large-diameter and mid-long bored piles and the influencing factors on bearing characteristics, in the aspects of load-settlement relationship, distribution of side friction of pile, pile-soil relative displacement and performance of tip resistance. The results show that ultimate loads of 5-1#, 6-2#, 6-3# are 68 917 kN, 62 316 kN and 75 234 kN, respectively.