Abstract
Shearing slippage damage is the main failure type at the interface of pile and soil, when the pile-top load increase, the piles displacement gradually increase and the pile and soil will occur shear failure from top to bottom, besides, the lateral friction resistance of pile foundation will reach the maximum value gradually. The friction resistance of pile foundation should largely depend on the pile-soil interaction, in most cases, it will form shear bonds near the interface of the soil, once the shear bonds penetration and sliding, which marks the pile-soil interface damage.
