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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。
Combined with the research of bearing capacity of large diameter bored pile in Futian area, Shenzhen, three full-scale static load tests were carried out. Through the test, the related data of pile axial force and pile tip pressure were obtained. The mechanical properties of the pile were studied by analyzing the experimental data. The inverse slope method is also used to deduce the ultimate bearing capacity of this test, which proves that there is still huge bearing capacity potential for the drill-piling. It is suggested that the method of determining bearing capacity eigenvalues according to s / D = 0.01 ~ 0.15 can not only ensure safety but also exert the potential of large diameter pile.