Abstract:
Designing pile foundation by using static design formulae can be used to estimate the axial capacity of single pile.
However, this design method does not take time variable as a factor of axial capacity into account. Both field and
researches before found that there was a set-up phenomenon on axial capacity of single driven pile due to time
dependent. This study is conducted to investigate time dependence on axial capacity of driven piles in soft soils by
model test and compare the time dependencies, which were suggested by previous researchers. Research was
conducted by load testing to the models of pile foundation that have been installed in the soft soils with various time
due to driving. Similarly, results shows that the capacity of pile increases to certain extend with time after installation.
Test results are interpreted by using Chin Method and Mazurkiewicz Method, and then plotted in chart of time versus
ratio (Q/Q0) to show the time dependency on axial capacity. Research concludes that there is differences set-up factor
according to the method that used to interpreting axial capacity. It is pointed out the set-up factor for the empirical
relationship offered with the reference time is chosen to be one day.
