BEHAVIOR OF A FRICTION PILE IN CLAY IN A TRIAXIAL CHAMBER

This study deals with the behaviour of a friction pile in a clay, in a triaxial chamber, and in particular with the generation of pore pressures during driving, and with the mobilization of lateral friction during loading tests at constant rate of penetration and static. The results show that the setting compares with that of a piezocone, and that the pore pressures generated at the point during driving, in the laboratory, are of the same order of magnitude as those obtained on the field. The conditions of reconsolidation used in the laboratory, which define the effective stresses around the pile, allow the calculation of the lateral friction on the model pile. The same conditions of reconsolidation were applied to the full-scale tests, on the Maskinonge site, and yielded values of angles of friction-delta of 16-degrees for steel and 20-degrees for concrete.