BEHAVIOR OF DISPLACEMENT CONCRETE PILE UNDER COMPRESSIVE LOADS

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 load-settlement 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.