后压浆桥梁钻孔灌注桩静载试验研究

Post-grouting bridge bored pile static load test research

分析后压浆技术力学作用机理,阐述桩基加固原理。结合特大桥钻孔灌注桩施工实践,建立试桩检测后压浆处治后桩侧阻力、桩端阻力和单桩竖向极限承载力,并分析加固后对桩基承载力的影响,分析试验结果得出加固后桩侧阻力、桩端阻力和单桩竖向极限承载力明显提高,加固效果明显。

Analyze the mechanics mechanism of post-grouting technology and explain the principle of pile foundation reinforcement.Combined with the construction practice of bored piles of large bridges,the pile side resistance,pile end resistance and the vertical ultimate bearing capacity of single pile after grouting treatment after test pile detection are established,and the influence of reinforcement on the bearing capacity of pile foundation is analyzed,and the test results are analyzed.It is concluded that the pile side resistance,pile tip resistance and the vertical ultimate bearing capacity of single pile are obviously improved after reinforcement,and the reinforcement effect is obvious.