Laboratory model test results are presented which are related to the variation of uplift capacity of pile groups with various shape, size, and pile spacings in loose sand. The tests for uplift capacity of buried signle piles were conducted in a sand box. The rough wooden model piles, 12 in. long and 0.5 in. in diameter with a length to diameter ratio of 24, were screwed to a 0.5-in thick wooden cap in the desired configuration. The uplift was applied by a cable 1/8 in. in diameter attached to the center of the pile cap. Test details are briefly outlined. An equation is presented which expresses the group efficiency based on net ultimate uplift capacity of piles. Using this expression, the group efficiencies for various group sizes under consideration at different pile spacings were calculated from the model test results. The model of placement of the pile and sorrounding soil is repsentative of bored tension piles in loose granular soil. For the tests presented herein, isolation spacing generally occurred between 4 to 6 diameters.

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Filing Info

  • Accession Number: 00134659
  • Record Type: Publication
  • Report/Paper Numbers: ASCE #11962
  • Files: TRIS
  • Created Date: Jun 23 1976 12:00AM