深圳地区大直径钻扩桩的试验研究

结合深圳福田地区大直径钻孔扩底灌注桩承载力研究课题,对三根试桩进行了足尺静载试验。通过试验得到桩身轴力及桩端压力的相关数据,通过对试验数据的处理分析,研究了其力学性能。还采用逆斜率法推导了本次试验的极限承载力,证明钻扩桩还存在巨大的承载力潜力。建议按照s/D=0.01~0.15来确定承载力特征值的方法,既能保证安全性,又可以发挥了大直径桩的潜力。

EXPERIMENTAL STUDY ON PEDESTAL BORED PILES WITH LARGERDIAMETER IN SHENZHEN

Based on the research subject on in Futian of Shenzhen,static loading tests had been done on three experimental piles.Axial force and bottom resistance were gathered and mechanism of settlement was analyzed by the experimental data.Converse-slope method was also adopted to calculate the ultimate bearing capacity and the results testify that the bearing capacity has big potential for pedestal bored pile.it was also proposed to use s/D=0.01~0.15 to decide the eigenvalue of pile bearing capacity,which can effectively exert the bearing capacity and ensure the safety.