超长PHC管桩承压性能试验研究

摘要

According to the compressive static loading experiment on six PHC super-long pipe pile,the paper analyzes the compressive static performance of the PHC pipe pile,adopts the high strain dynamic testing method,concludes the side friction resistance and end-bearing friction at different soil layers,proves by the research result that the single-pile compressive loading capacity varies along with the different bearing stratums,the single ultimate loading capacity,the end-bearing friction,and its total friction increase with the addition of the pile length,and concludes the average of the recovery coefficient of the loading capacity(recovering coefficient of friction of soil around piles) is 1.13 according to the comparison between the test result from the pipe pile redriving and the driving tests.%根据6个PHC超长管桩的抗压静载试验,分析了PHC管桩的抗承载性能,采用高应变检测方法,得到了不同土层的侧摩阻力及桩端阻力值,研究结果表明：单桩抗压承载力因持力层的不同而不同;随着桩长的增加,单桩极限承载力、桩端阻力及其所占总阻力的比例相应增加;根据管桩复打和初打检测结果的比较,得到承载力恢复系数（桩周土阻力恢复系数）平均值为1.13。