Proceedings - Fourth International Conference - Piling and Deep Foundations, 1991, Stresa, Italy, (DFI)
Bearing capacity of driven piles from tests on site
D. Levacher; Universite du Havre, France J.P. Levillain; Laboratoire Regional des Ponts et Chaussees, Angers, France
Project designers have most difficulties to estimate the bearing capacity of driven piles. Sometimes, bearing capacity formulas don't give a sufficient accuracy and during the piling, it becomes necessary to have more information and evolution of the capacity of the driven piles. A possible test, not so expensive and easily feasible, as a dynamical test. Based on the wave propagation theory, using dynamical equipment (strain gauges and accelerometers) the dynamical tests are operated on driven piles on site. The piles (driven in sands) are in a cofferdam made with sheet-piles in the Loire river, and they support a part of a bridge built over the river. Tests equipments are mounted on the top of pile, on a special socket welded on the top. Dynamical measurements are performed during the driving (end of the driving) near refusal. All results on the bearing capacity are discussed in regard with predicted dates from project designers. Conclusions are given on the use of the dynamical test on pile.
|article #525; publication #37 (IC-1991-IT)|