Recent model test results for the resistance of rigid rough vertical piles subjected to oblique uplifting load in loose sand are presented. The tests were conducted for 12-in. (305 mm) and 8-in. (200 mm) long wooden piles, all of which had a diameter of 1 in. (25-mm); a dry silica sand was used. The pullout load was applied by a 1/8-in. (3.18 mm) cable attached at the center of the pile, and tests were conducted for load inclinations varying from 0 deg. to 90 deg. with the vertical. The test results are presented and analyzed. Ths study showed that the uplift capacity of short rigid piles under oblique pull can be estimated for loose granular soil by use of the approximate interaction relationship suggested by Meyerhof for rigid vertical anchors with enlarged base. However, with short piles having an embedment ratio less than critical, a conservative estimate of vertical uplift resistance (delta) is necessary to estimate gross vertical uplift capacity. For longer piles where embedment ratios are greater than critical, the evaluation of gross vertical uplift capacity must be altered to account for a limiting value of the average unit skin friction (f) which would apply over the length of pile below the critical depth.

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  • Accession Number: 00142226
  • Record Type: Publication
  • Report/Paper Numbers: Tech Note
  • Files: TRIS
  • Created Date: Nov 23 1976 12:00AM