Load transfer mechanism of rock-socketed piles of Dongjiang Rive Bridge

The bearing capacity tests on two single large-diameter rock-socketed piles were carried out on Dongjiang River Bridge in Dongguan City.The load transfer behaviors of the piles implanted into soft rock layers were analyzed,the effect on the shaft resistance and the tip resistance of pile were analyzed after grouting into the tip of piles,and the relationship between the shaft resistance and the relative displacement was obtained.It was indicated that there were dregs in the tip of two piles and the curve of Q-s was a double broken line,the ultimate bearing capacity of the piles increased and the relevant settlement decreased remarkably after grouting,and the relationship between the shaft resistance near the tip and the relative displacement might be the type of working softening or parabola which was also influenced by grouting.