Friction Capacity of Piles Driven into Clay

by Leland M. Kraft, Jr., (M.ASCE), Manager; Special Projects Group, McClelland Engrs, Inc., Houston, Tex.,
Srinath F. Amerasinghe, (M.ASCE), Geotechnical Engr.; McClelland Engrs., Inc., Houston, Tex.,
John A. Focht, Jr., (F.ASCE), Exec. Vice Pres.; McClelland Engrs., Inc., Houston, Tex.,

Serial Information: Journal of the Geotechnical Engineering Division, 1981, Vol. 107, Issue 11, Pg. 1521-1541

Document Type: Journal Paper

Discussion: Bhushan Kul (See full record)
Closure: (See full record)

Abstract: Several studies on axial pile capacity in clays have shown that the average frictional resistance, expressed as a fraction of the average undrained shear strength or average effective overburden pressure, decreases with increasing pile penetration. Procedures to compute shaft friction are reviewed, and the effect of pile length on the development of shaft friction on piles in clay is examined in terms of the relative pile-soil stiffness and lateral pile movements during installation. Correlations are developed to relate shaft friction coefficients α,β,λ, to pile length, relative pile-soil stiffness, and soil stress history. Procedures are recommended to compute the friction capacity of piles in clay.

Subject Headings: Piles | Friction | Clays | Shafts | Soil pressure | Soil strength | Shear resistance | Shear strength |

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