Étude du processus de vibrofonçage d'inclusions cylindriques en chambre d'étalonnage. Application au pieux

Abstract : Within the framework of this work, one sought to better understand the elementary mechanisms which control the process of vibratory driving and to highlight the parameters which have significant influences on this process, by the use of physical modelling in a calibration chamber. The influence of each parameter is represented by the vibro-drivibility (penetrability of the pile by the vibratory driving), the evolution of tip resistance and that of lateral friction. We developed an instrumented probe that allows to measure separately tip resistance and lateral friction, in order to study the mechanisms of mobilization of these two parameters during the process. We focused, within the framework of this work, on parameters related to the head loading such as the frequency of vibration, the average load and the cyclic amplitude; and on parameters related to the sand mass, namely sand of Fontainebleau, such as the level of constraint of consolidation and the state of saturation of sand. To study the influence of each parameter, a series of tests was carried out by varying one parameter from one test to another while fixing the other test parameters. We could highlight the significant influence of the cyclic amplitude ratio on the average load (Fcyc/F0) on the displacement of the probe. The probe penetrates more quickly with a higher ratio than with a small ratio. The results obtained also show that the higher the frequency is, and the more the probe is inserted and the less tip resistance and lateral friction are mobilized.
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Engineering Sciences. Ecole des Ponts ParisTech, 2005. French


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Submitted on : Friday, November 26, 2010 - 1:36:48 PM
Last modification on : Friday, November 4, 2011 - 3:51:52 PM

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  • HAL Id : pastel-00001557, version 1

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Trung Le Thiet. Étude du processus de vibrofonçage d'inclusions cylindriques en chambre d'étalonnage. Application au pieux. Engineering Sciences. Ecole des Ponts ParisTech, 2005. French. <pastel-00001557>

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