This note describes an experimental study in which the phenomena influencing the development of patterns of skin friction in a very long, slender pile driven progressively deeper into two compacted clays were investigate. A 1-inch (25-mm.) diameter steel closed-ended test pile was driven in sections, and axial load tests were conducted at four increasing penetrations in each of two clay soils of differing plasticity indexes. For both soils, it was found that the average ratio of measured ultimate unit skin friction to remolded isotropically consolidated strength decreases with increasing penetration at a decreasing rate. The ratio decreased sharply in the upper third of the embedded portion of the piles, while the ratio remains almost constant with increasing penetration in the lower two-thirds. In other words, no significant degradation of ride resistance occured in the lower two-thirds of the embedded portion of the pile, regardless of pile penetration. However, the side resistance in the upper third of the pile decreased as penetration increased.

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  • Accession Number: 00319429
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 15640
  • Files: TRIS
  • Created Date: Jan 19 1981 12:00AM