桩底后压浆技术对桩承载性能的影响研究

选取乐清湾大桥的两根试桩,通过自平衡静载测试,对试桩桩底压浆前后的承载性能进行研究对比,得出桩底后压浆对桩承载性能的影响。结果表明:压浆后,桩端承载力以及桩侧摩阻力都显著提高,端阻力增加约80.0%~83.3%,侧摩阻力增幅达71.4%,后压浆对于改善桩的承载力作用显著。

Study on Influence of Post-grouting Technology of Pile Bottom on the Bearing Behavior of Pile

The two piles of Leqingwan Bridge were selected to carry out self-balanced static load test, then the bearing behavior of the piles before and after the pile bottom post-grouting was studied and compared, and the influence of the grouting on the bearing behavior was found. The result shows that, after the grouting, the pile end resistance and the pile side friction are increased so greatly that the resistance increased by 80.0 %~83.3 % and the friction by 71.4 %; therefore, the post-grouting may improve the pile’s bearing capacity to a significant extent.