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Load transfer data are presented for six piles embedded in sand. The data were adjusted to account for residual loads caused by driving in order to arrive at the true variation of skin friction with depth. Residual loads of 25 to 48 tons were observed for conventionally driven piles, whereas the load for a pile driven with a vibratory hammer did not exceed the weight of the driver. Friction during compression was found to exceed that during tension by 30 percent. An average lateral earth pressure coefficient of 1.1 was observed, with a value of 0.75 being observed for a jetted pile. The data indicate that conventional hammers may compact the soil below the pile tip and improve point bearing capacity. Skin friction adjacent to the pile tip was found to be significantly lower than for other parts of the pile.
instrumentation piles, load transfer, bearing capacity, bearing piles, dynamic loads, static loads, dead loads, skin friction, bearing stresses, vibratory pile drivers, evaluation, tests
Hunter, A. H.
Chief, Fruco and Associates, Inc., St. Louis, Mo.
Davisson, M. T.
Associate professor of Civil Engineering, University of Illinois, Urbana, Ill.