LATERAL RESPONSE OF THREE-ROW GROUPS IN LOOSE TO DENSE SANDS AT 3D AND 5D PILE SPACING

Researchers conducted centrifuge tests on single and 3 x 3 pile groups at three-diameter (3D) and five-diameter (5D) spacings. In all the tests, the piles were driven and laterally loaded in flight without stopping the centrifuge. The piles simulated 430 mm diameter by 13 m long pipe piles founded in medium loose and medium dense sands. Results showed that the ratio of lateral resistance of a group to a single pile was independent of soil density. The group efficiency was 0.74 and 0.94 at 3D and 5D spacing, respectively. To determine the p-y strength, drained triaxial compression tests were conducted on the sand at multiple densities. Reese et al.'s p-y curves (1974) resulted in excellent predictions of the prototype single-pile response for both relative densities. The p-y multipliers were back-calculated using the single-pile response and the measured total and individual row contributions within the group. At 5D spacing, the multipliers did not vary significantly; however, at 3D spacing, multipliers did vary, according to test data. The latter variance was due to variation in row distribution measured at the different soil densities. All tests were performed on free-headed piles.

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• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • McVay, M
  • Casper, R
  • Shang, T-I
• Publication Date: 1995-5

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 436-441
• Serial:
  • Journal of Geotechnical Engineering
  • Volume: 121
  • Issue Number: 5
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9410

Subject/Index Terms

• TRT Terms: Centrifuges; Deformation curve; Pile groups; Sand; Soils; Spacing; Specific gravity; Support piles; Testing
• Uncontrolled Terms: Lateral loads; Soil conditions
• Old TRIS Terms: Pile spacing
• Subject Areas: Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00680637
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 26 1995 12:00AM