ABSTRACT
This paper presents the results of detailed analyses, using centrifuge model testing, of the influence of the testing method and installation method of the additional mini-pile foundations on the performance of the existing foundations when subjected to re-load cycles. All the tests presented investigate the performance of bored pile foundations in stiff overconsolidated soil. The sample was prepared in a consolidation press where it was subjected to vertical stress of 500 kPa and then swelled back to 250 kPa before the model was assembled and placed on the centrifuge. The centrifuge tests were performed in stiff overconsolidated kaolin clay (overconsolidation ratio at the base of the sample 4) with average undrained shear strength of 75 kPa. For the purpose of this research the undrained shear strength was estimated based on the findings by Springman (1989). Springman (1989) proposed the following relationship for Speswhite Kaolin clay which represents the mean value obtained form series of vane shear test conducted in-flight in the centrifuge:-
tions on existing foundations is considered in terms of load capacity and stiffness.
