Journal article
Piled rafts in overconsolidated clay: comparison of in situ measurements and numerical analyses
Publication Details
Authors: | Reul, O.; Randolph, M. |
Publication year: | 2003 |
Journal: | Géotechnique |
Pages range : | 301-315 |
Volume number: | 53 |
Start page: | 301 |
End page: | 315 |
ISSN: | 0016-8505 |
eISSN: | 1751-7656 |
Abstract
This paper presents the results of detailed back-analysis,using three-dimensional finite-element analysis, of threepiled raft foundations on overconsolidated clay. Comparisonsof overall settlement, differential settlements and theload carried by the piles show reasonably good agreement,although the finite-element analyses generally showa higher proportion of the overall load being carried bythe piles than estimated from the field measurements.Three main performance indicators of the piled raft areproposed: the proportion of load carried by the piles,and the maximum settlement and maximum differentialsettlement, both as a proportion of the correspondingquantity for an unpiled raft foundation. The last indicator,in particular, suggests that improved layout of thepile support can lead to a reduction both in the maximumdifferential settlement and in the overall quantity ofpiles. This is illustrated for one of the case histories.
This paper presents the results of detailed back-analysis,using three-dimensional finite-element analysis, of threepiled raft foundations on overconsolidated clay. Comparisonsof overall settlement, differential settlements and theload carried by the piles show reasonably good agreement,although the finite-element analyses generally showa higher proportion of the overall load being carried bythe piles than estimated from the field measurements.Three main performance indicators of the piled raft areproposed: the proportion of load carried by the piles,and the maximum settlement and maximum differentialsettlement, both as a proportion of the correspondingquantity for an unpiled raft foundation. The last indicator,in particular, suggests that improved layout of thepile support can lead to a reduction both in the maximumdifferential settlement and in the overall quantity ofpiles. This is illustrated for one of the case histories.
Keywords
case history, numerical modelling and analysis, piles, rafts, settlement, soil-structure interaction
