Two test piles with the same diameter for the Jili-Yellow River Bridge were tested with the self-balanced test and the anchored pile method respectively. According to the contrast of average shaft resistances of two piles

the regularity of the relationship between settlement and average shaft resistances is similar

they could be fitted with the hyperbolic model. While settlement is 12 mm

the average negative shaft resistance is 0.84 times of the normal one. The Q-S curves is very close in the first part

but with the increase of loads

the descending rate of the curve of S1 is faster than that of S2. While settlement is 30 mm

the capacity of S2 is 59 500 kN，the capacity of S1 is 48 000 kN. The ratio of base resistance of S1 to the total load is 22.46 %

this pile is a friction-base pile; the ratio of base resistance of S2 to the total load is 3.59 %

this pile is a friction pile.