PREDICTING SAFE CAPACITY OF PILE GROUPS

THE METHODS AVAILABLE AT PRESENT TO FOUNDATION ENGINEERS FOR PREDICTING PILE GROUP CAPACITIES ARE MAINLY OF AN EMPIRICAL NATURE, AND NO ACCEPTABLE THEORY HAS BEEN DEVELOPED TO RELATE THE BEHAVIOR OF A PILE GROUP TO THAT OF A SINGLE PILE. THESE METHODS, WHICH ARE ILLUSTRATED AND DISCUSSED IN THIS STATE OF THE ART REVIEW, INCLUDE VARIOUS 'EFFICIENCY FORMULAS' AND QUASITHEORETICAL DESIGN PROCEDURES FOR PILE GROUPS IN CLAY AND EMPIRICAL DESIGN PROCEDURES FOR PILE GROUPS IN SAND. EFFICIENCY FORMULAS HAVE LITTLE TO RECOMMEND THEM AS THEY DO NOT CONSIDER THE CHARACTERISTICS OF THE SOIL SURROUNDING THE PILE GROUP OR THE SETTLEMENT CAUSED BY COMPRESSION OR CONSOLIDATION OF THE SOILS UNDERLYING THE PILE TIPS. FOR PILES IN CLAY, THE DESIGN PROCEDURES ARE BASED ON VERY APPROXIMATE ASSUMPTIONS CONCERNING THE TRANSFER OF STRESS FROM THE PILE GROUP TO THE CLAY. DESIGN PROCEDURES FOR PILE GROUPS IN SAND ARE ALL BASED ON THE PERFORMANCE OF A FEW FULL-SCALE STRUCTURES. RELIABLE ANALYTICAL METHODS FOR ESTIMATING SETTLEMENTS BASED UPON STRENGTH AND COMPRESSIBILITY OF NATURALLY OCCURRING SOILS ARE NOT LIKELY TO BE AVAILABLE IN THE NEAR FUTURE. THE LIMITATIONS, THEREFORE, OF THE METHODS DISCUSSED MUST BE RECOGNIZED. /ASCE/

  • Availability:
  • Supplemental Notes:
    • Vol 38, No 10, PP 44-48, 10 FIG, 17 REF
  • Authors:
    • Sheehan, J R
    • Moorhouse, D C
  • Publication Date: 1968-10

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  • Accession Number: 00208898
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 1 1994 12:00AM