Abstract

Aimed at the time effect, group effect and difference between negative skin friction (NSF) on pile in sand and that in clay, a series of model tests include single pile tests and pile group tests were carried out. The test results indicate that the NSF on pile increases with consolidation time of clay, which increases rapidly in early stage and slowly in later stage. The position of pile has significant influence on the group effect of NSF. Furthermore, the effective stress factor of NSF in clay is 85.73 % of that in sand based on test results.

Keywords:
axial force, consolidation, test result, time effect, negative skin friction, kpa, settlement, effective stress factor, pile group, group effect
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2014. International Society of Offshore and Polar Engineers
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