Based on the self-balanced test technology

the size effect on the large diameter rock-socketed pile has been analyzed by using in-situ testing methods

including the change of diameter

the depth socketed in rock and size effect on tip resistance of pile and so on. From the result of test

it can be seen that it exit a certain phenomenon of the size effect on the large diameter rock-socketed pile. With the increasing of pile diameter

the side resistance is decreased while other conditions are invariable. From the socketed depth point of view

the side resistance of pile is not the same in the case of the same rock areas because of the difference of its socketed depth. The greater the depth embedded in rock

the smaller the side resistance of pile. The experimental results show that the character of the rock around the pile has the greatest impact on the pile side resistance. The higher the compressive strength of rock

the side resistance of pile is also greater. In addition

the effect of diameter change on the pile tip resistance is even more apparent. Therefore

the design of large diameter pile should pay attention to the size effect on the bearing capacity in rock areas.