Application and advance of vibratory driving techniques using high-frequency hydraulic vibratory hammer

Vibratory driving techniques have become increasingly popular all over the world primarily for driving and extracting piles. High-frequency vibratory hammer with hydraulic clamping device has many advantages. However, its foremost questions are driveability and the bearing capacity calculation of the installed pile. At present limitations in engineering knowledge related to the vibratory driving technique present an impediment for being able to utilize their full potential. A brief history of the vibratory techniques, the functioning of modern vibratory equipments and various components, mechanical action and the most important vibratory parameters are presented. A detailed literature review is given, that is, forepart research, vibro-driveability tests and numerical analysis. And then a series of models of vibratory driveability are depicted including their corresponding theories, assumptions, justifying methods and noticeable questions, which are classified in the terms of mechanics, kinematics, energy conservation and integration of motion law respectively. Finally some aspects are put forward which should be studied to enlarge the engineering knowledge and to utilize the full potential of the techniques.