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Technical paper: Model testing of continuous helical displacement piles

Andreas C Frangoulides, C Frangoulides Developing Co, Cyprus (formerly Department of Engineering, University of Cambridge). This paper was first published in GE’s December 2000 edition.

Abstract

This paper describes the model testing of auger displacement piles in clay, a recent development that provides significant environmental advantages over conventional piling. Constructed model piles were loaded to failure in compression and tension and were physically examined after construction and loading. The work presented investigates factors which affect the design of such piles such as the adhesion factor, shape and integrity of the concrete flanges and the location of shear displacement surfaces which determine the effective diameter. Simple laboratory model tests provided a fast, inexpensive and effective technique for studying the physical processes governing pile performance and have complimented full-scale tests. Improved auger design led to the construction of piles with full flange integrity and an increased load capacity. 

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