Experimental Modeling of the Shaft Capacity of Grouted Driven Piles
Joer HA, Randolph MF, Gunasena U
(Received 20 January 1997; accepted 23 February 1998)

Abstract
Pile foundations are widely used in compressible soils such as calcareous sediments. However, the friction capacity of driven piles in such soils tends to be very low, owing to severe reduction of the normal effective stresses at the pile-soil interface during installation of the pile, caused by densification of the soil. The shaft capacity may be increased by injection of grout along the pile-soil interface, referred to as “grouted driven pile” construction. A new apparatus for testing such a type of pile has been developed at the University of Western Australia. In this paper, the design of the apparatus and associated model piles are described, along with the grouting technique. Limitations of early versions of the apparatus and difficulties with grouting at small scale are discussed, and recommended solutions are presented. Results of tests performed on specimens of calcareous soils that were artificially cemented in order to reproduce typical in situ strengths are also presented.

Keywords:
calcareous soils, cone resistance, grouting, pile foundation, shaft capacity, unconfined compressive strength

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