Relaxation of Piles in Sand and Inorganic Silt

by Nai C. Yang, (F.ASCE), Chf. Civ. Engr.; Port of New York Authority, New York, NY,

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1970, Vol. 96, Issue 2, Pg. 395-409

Document Type: Journal Paper


Many attempts have been made to modify the pile driving formulas to make them realistic in terms of modern driving practices and equipment. None seems to have had a long-lasting impact on the engineering profession. The driving impulse of a pile is always associated with a temporary remolding of surrounding soil, a zone of excessive pore water pressure and the dilatancy of dense fine sand. For piles subjected to loading tests or under the load of a structure, there is no displacement in the soil; therefore, no remolding, no dilatancy and no excessive pore water pressure arise around the pile. A review has been made of the basic mechanics relating to relaxation of pile resistance in dense fine sand or inorganic silt as well as the freeze of piles in soft clay or organic silt. The pile resistance at the beginning of redriving can be used more effectively in representing the static capacity of a pile than that encountered in initial driving.

Subject Headings: Water pressure | Soil dilatancy | Soil pressure | Frozen soils | Soft soils | Soil water | Pile tests | Load tests

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