Installation and evaluation of driven steel pipe piles in Alaska soils

Sie sind hier: Homepage > Suche

Installation and evaluation of driven steel pipe piles in Alaska soils

Merrill, K.S. / Korri, K. / Miner, R.F.

This paper describes the installation and evaluation of large-diameter steel pipe piles driven in different soil types at six sites across Alaska. The soils at these sites include sand and gravel, fine-grained silt and clay, and highly saline permafrost. Field monitoring results were obtained at each site with a pile driving analyzer (PDA). This paper also discusses appropriate use of the PDA method and other tools, including analytical methods for static pile capacity and wave equation analyses. Use of the Case Pile Wave Analysis Program (CAPWAP) for estimating ultimate static soil resistance from the PDA results is examined. The shaft and toe resistances determined from CAPWAP are compared with resistances determined from a common analytical method for static pile capacity or static load test results (where available). Discussion covers potential limitations of the PDA method and the analytical methods in predicting the static soil resistance of large-diameter, open-end steel pipe piles, particularly for determination of the static toe resistance. Additional topics are the importance of properly selecting the pile driving hammer and an evaluation of the magnitude of soil strength gain with time, or soil setup, on the basis of PDA restrike tests. Finally, driving problems that can occur when an interior plate is installed in a pile without adequate air relief holes are discussed.