The influence of batholith on the vertical pulling bearing capacity of rock-socketed piles is
studied. The test results show that the extension of stress and the angle between fracture-sections
depend on the strength and integrality of batholith. The higher is the strength ratio of piles to
batholith, the more uniform is the shear stress distribution on their interfaces. The displacement is
the control index of pile design if the strength of batholith is much less than those of the piles.
Failure of a pile depends mainly on the distribution and characteristics of rock discontinuities, and
under this condition, the anchorage section should be placed at middle or lower parts of the piles.