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IN-SITU AXIAL LOAD TESTS OF DRILLED DISPLACEMENT STEEL PILES
Session: Foundations IV / Fondations IV
Fazli Shah, University of Alberta (Canada)
Lijun Deng, University of Alberta (Canada)
Drilled Displacement Steel Pile (DDSP) is an innovative pile type that fully displaces the soil during installation. DDSP consists of a conical tip with steel blades and a steel tubular pipe. Compared to conventional drilled displacement piles, this pile type has many advantages that include rapid installation, immediate usability, and greater pile capacities. Consequently, DDSP has recently been widely used in varieties of engineering applications in Western Canada. However, the axial behaviour of DDSP has not been well understood due to the lack of research, and a design guideline has not been developed. A series of in-situ load tests of full-scale piles were conducted at two testing sites in Alberta. Three axial compression and two tensile tests were conducted on heavily instrumented piles. The paper evaluates the axial capacities and the load-transfer mechanisms during axial loading tests and compares the existing design methods adopted for other pile types.
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