Publication Abstract

Proceedings - Fourth International Conference - Piling and Deep Foundations, 1991, Stresa, Italy, (DFI)

Determination of the bearing capacity of screwed-in piles by dynamic pile testing
P. Gilles Laboratoire du Genie Civil, Universite Catholique de Louvain, Belgium E. Tancre & F. De Cock Franki Company, Division Foundations, Belgium E. Lousberg Unite Genie Civil, Universite Catholique de Louvain, Belgium

In the middle 80's, FRANKI Company developed a dynamic pile testing system. The analysis method was based on a Smith integration model of which the pile-soil interaction laws had been modified. Further research work in a collaboration between the 'Laboratoire du Genie Civil' and FRANKI has now resulted in significant improvements of the hardware, as well as the theoretical approach and the software. Using the test measurements (strain and acceleration or velocity), the characteristics of the soil layers surrounding the pile are determined by a trial and error method. With the accepted modelisation the expected pile behavior for static load condition is computed. In this paper, after a theoretical analysis the stress repartition in the pile cap is discussed. The reliability of the developed soft- and hardware has been analyzed in detail for two sites where dynamic as well as static loading tests have been performed on screwed-in ATLAS piles.

 article #520; publication #37 (IC-1991-IT)