Abstract
This paper presents the results of centrifuge model tests that were carried out to investigate the effect of negative skin friction on piles installed through soft clay and founded in underlying dense sand. It is found that the induced negative skin friction along the pile shaft increases with the settlement of soft clay and reaches a maximum value upon the occurrence of full pile-soil slippage. Upon application of axial loading, this locked-in negative skin friction would diminish and eventually disappear with the neutral plane shifting upwards gradually with the increase in loading. However, if surcharge was again placed on the clay surface inducing additional soft clay settlement, downdrag forces would re-establish along the pile shaft with the neutral plane shifting downwards. The effect of negative skin friction developed on a pile group is also examined in this paper.
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