Piled rafts in overconsolidated clay: comparison ofin situmeasurements and numerical analyses
Authors:
- O. ReulORO. Reul
- M. F. RandolphMRM. F. Randolph
- 1 April 2003
- journal article
- Published by Emerald Publishing in Géotechnique
- Vol. 53 (3) , 301-315
Abstract
This paper presents the results of detailed back-analysis, using three-dimensional finite-element analysis, of three piled raft foundations on overconsolidated clay. Comparisons of overall settlement, differential settlements and the load carried by the piles show reasonably good agreement, although the finite-element analyses generally show a higher proportion of the overall load being carried by the piles than estimated from the field measurements. Three main performance indicators of the piled raft are proposed: the proportion of load carried by the piles, and the maximum settlement and maximum differential settlement, both as a proportion of the corresponding quantity for an unpiled raft foundation. The last indicator, in particular, suggests that improved layout of the pile support can lead to a reduction both in the maximum differential settlement and in the overall quantity of piles. This is illustrated for one of the case histories. Cet exposé présente les résultats d'une rétro-analyse détaillée utilisant une analyse d'éléments finis en trois dimensions, de trois fondations en tables à piles sur une argile surconsolidée. Les comparaisons du tassement général, des tassements différentiels et de la charge portée par les piles, correspondent assez bien, même si les analyses d'éléments finis montrent dans l'ensemble que la proportion de la charge générale supportée par les piles est plus élevée que celle suggérée par les mesures sur le terrain. Nous proposons trois indicateurs de performance principaux pour les fondations en tables: la proportion de charge portée par les piles et le tassement maximum ainsi que le tassement différentiel maximum, tous deux comme proportion de la quantité correspondante pour une fondation sans piles. Le dernier indicateur, en particulier, suggère qu'en améliorant l'agencement amélioré des piles de support, on peut obtenir une réduction du tassement différentiel maximum et de la quantité globale de piles. Ce...Keywords
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