BEHAVIOR OF DISPLACEMENT CONCRETE PILE UNDER COMPRESSIVE LOADS
Keywords:Displacement concrete pile, Static load test, Proof Test, Test interpretation
This paper provides the research of displacement precast piles through performing compressive
Static Load Tests (SLTs). A total number of 40 piles which contain square solid pile and pipe pile with various
pile lengths were tested. It is concluded that, because of the soil layers’ difference among driven locations, the
piles with various lengths presents different maximum settlements. Furthermore, it is discovered that the loadsettlement curves obtained from the same type of concrete pile are relatively parallel during unloading stages.
For the solid pile, the interpretations which are based on Double Tangent and Chin’s method are used for
capacity determination, and these results are compare to the designed ultimate capacity. It can be found that
the Double Tangent method is conservative, and Chin’s method overestimate the pile capacity. The increase
and reduction factors are proposed and then the modified Double Tangent and Chin’s interpretations are
determined. Due to most of the SLTs being the Proof Tests (PTs), it is expected that this paper can provide
practical information for geotechnical engineers to determine the ultimate bearing capacity of pile foundation
from these PT results.