2012•Guangdong Highway CommunicationsRequires access

Design Mechanism of Cushion in CFG-pile Composite Foundation

Gong Xiao-nan

Abstract

CFG-pile composite foundation is composed of pile,soil and cushion.Cushion technology is the key part of composite foundation and has significant influence on the force and deformation of composite foundation.However,the role of the cushion is closely related with its thickness.Based on Terzaghi′s theory of ultimate bearing capacity of foundation soil,the mechanism of action of CFG-pile composite foundation is discussed and the mathematical formulas of reasonable thickness of cushion,optimum space between piles and the pile-soil stress ratio are put forward,which have been testified by project cases and could be used as references for the initial design of cushion.

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Key concepts: Cushion, Terzaghi's principle, Pile, Foundation (evidence), Composite number, Geotechnical engineering, Engineering, Bearing capacity