Comparative analysis of various interaction effects for piled rafts in sands using centrifuge tests

AbstractIn the current study, the load responses and interaction effects of piled rafts embedded in sands were investigated. A series of centrifuge load tests were conducted using different types of model foundations. Single piles, group piles, piled rafts, and unpiled rafts were adopted in the tests to analyze various interaction effects of piled rafts. The load-settlement curves of piled rafts were similar to those of group piles for the initial settlement range and became similar to those of rafts as settlement increased. The pile-group, pile-to-raft, and raft-to-pile interaction factors showed state-dependent and nonlinear variations with settlement. Both pile-to-raft and raft-to-pile interaction factors decreased within the initial settlement range and increased with increasing settlement. The range of pile-to-raft interaction factor values was much larger than the range of values for the raft-to-pile interaction factor. The load response and load transfer relationship of piles for piled rafts were d...

[1]  Lech Bałachowski,et al.  Scale effect in shaft friction due to the localisation of deformations , 1998 .

[2]  Luca de Sanctis,et al.  Bearing Capacity of Piled Rafts on Soft Clay Soils , 2006 .

[3]  Jie Han,et al.  A field study on the behavior of a foundation underpinned by micropiles , 2006 .

[4]  G G Mayerhof,et al.  Bearing Capacity and Settlement of Pile Foundations , 1976 .

[5]  Mark Randolph,et al.  A contribution to optimum design of piled rafts , 1998 .

[6]  Harry G. Poulos.  16. Practical design procedures for piled raft foundations , 2000 .

[7]  Ulvi Arslan,et al.  Piled raft foundation projects in Germany , 2000 .

[8]  Lech Bałachowski,et al.  Size Effect in Centrifuge Cone Penetration Tests , 2007 .

[9]  George Geoffrey Meyerhof,et al.  Some recent research on the bearing capacity of foundations , 1963 .

[10]  Duc Long Phung.  Footing with Settlement-Reducing Piles in Non-Cohesive Soil , 1993 .

[11]  Vincenzo Fioravante,et al.  Contact versus noncontact piled raft foundations , 2010 .

[12]  O. Reul,et al.  Piled rafts in overconsolidated clay: comparison of in situ measurements and numerical analyses , 2003 .

[13]  Mark Randolph,et al.  Centrifuge modelling of piled raft foundations on clay , 1996 .

[14]  Y. El-Mossallamy,et al.  12. Calculation methods for raft foundations in Germany , 2000 .

[15]  Mark Randolph,et al.  Centrifuge modelling to investigate the performance of piled rafts , 2003 .

[16]  Francesco Castelli,et al.  Simplified Nonlinear Analysis for Settlement Prediction of Pile Groups , 2002 .

[17]  Barry Lehane,et al.  Behavior of Axially Loaded Pile Groups Driven in Clayey Silt , 2006 .

[18]  Bolton,et al.  Geometry and scale effects in CPT and pile design , 1998 .

[19]  Rodrigo Salgado,et al.  Analysis of the shaft resistance of non-displacement piles in sand , 2008 .