Statistical analysis on the bearing capacity of 78 bored piles and 128 drilled piles and on the
normalized parameters of these piles’end and side resistancewas carried out. It is found out by comparison
that the ratios of the measured values to the calculated ones of the bearing capacity, the end resistance and
the side resistance conform to lognormal distribution. Meanwhile, the total piles’reliability indexes are
calculated by calibration method, with a result showingthatthe reliabilityof the bored piles is 4.11 and the
drilled piles 4.56.