Abstract: The research progresses in static and dynamics tests,constitutive models,interface elements,model tests and field tests of pile-soil interface are summarized,and the problems and deficiencies in the current research are analyzed. It is pointed out that research on the dynamic characteristics of pile-soil interface widely seen in practical engineering are in lack. Especially,big-size experimental instruments which can realize different loading methods to research the complex dynamic characteristics should be developed. More suitable constitutive model should be developed to describe the complex mechanical behaviors under complex stress conditions and different stress paths,and the interface element should be improved. It is necessary to seek a suitable method to intensively and systematically study the microscopic deformation mechanism so as to clarify the mechanism of its mechanical properties. Research on static and dynamic characteristics of interface between piles and problematic soils should be carried out to improve the reliability of pile foundation under complex geological conditions.

Key words: pile-soil interface, static and dynamic characteristics, constitutive model, interface element