Abstract
This note examines the theory of a possible reason for the reduction in skin friction factor with increasing pile lengths. Results indicate that the major cause of the length effect on the pile load capacity is the reflective compressibility of the pile. Tthis is expressed as a dimensionless axial stiffness factor, proportional to the cube of the embedded pile length, the axial stiffness and the rate of increase of the soil modulus with depth. Other contributing factors, which could be incorporated into the equation, include possible strain-softening skin friction response and the degradation of the pile-soil contact along the top part of the pile caused by lateral vibrations induced in the pile during driving. (Author/TRRL)
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