ANALYSIS OF THE SETTLEMENT OF PILE GROUP

AN ANALYSIS IS MADE OF THE SETTLEMENT INTERACTION BETWEEN TWO IDENTICAL PILES IN AN ELASTIC MASS AND THE INCREASE IN SETTLEMENT OF EACH PILE DUE TO INTERACTION IS EXPRESSED IN TERMS OF AN INTERACTION FACTOR. IT IS THEN SHOWN THAT, FOR SYMMETRICAL PILE GROUPS (THOSE IN WHICH THE PILES SETTLE EQUALLY AND ARE ALSO EQUALLY LOADED), THE INCREASE IN SETTLEMENT DUE TO INTERACTION MAY BE OBTAINED BY SUPERPOSITION OF THE VALUES OF THE INTERACTION FACTOR FOR THE INDIVIDUAL PILES IN THE GROUP. ON THE ASSUMPTION THAT SUPERPOSITION ALSO HOLDS FOR ANY GENERAL FREE STANDING PILE GROUP, THE BEHAVIOR OF PILE GROUPS IS ANALYSED FOR THE CASE OF A RIGID PILE CAP (EQUAL SETTLEMENT OF ALL PILES) AND A FLEXIBLE PILE CAP (EQUAL LOAD IN ALL PILES). FOR THE CASE OF A RIGID PILE CAP, VALUES ARE OBTAINED FOR THE RATIO OF THE SETTLEMENT OF THE GROUP TO THE SETTLEMENT OF A SINGLE PILE CARRYING THE SAME TOTAL LOAD (THE GROUP REDUCTION FACTOR), AND THE LOAD DISTRIBUTION WITHIN THE GROUP. FOR THE CASE OF A FLEXIBLE PILE CAP, VALUES OF THE MAXIMUM SETTLEMENT AND MAXIMUM DIFFERENTIAL SETTLEMENT ARE GIVEN. THE INFLUENCE OF PILE SPACING, PILE LENGTH, TYPE OF GROUP, DEPTH OF LAYER AND POISSON'S RATIO OF THE LAYER ON THE SETTLEMENT BEHAVIOR OF PILE GROUPS IS EXAMINED. FOR A PILE GROUP IN AN IDEAL ELASTIC TWO-PHASE SOIL, IT IS SHOWN THAT, AS WITH A SINGLE PILE, THE MAJOR PROPORTION OF THE TOTAL FINAL SETTLEMENT GENERALLY OCCURS AS IMMEDIATE SETTLEMENT. COMPARISONS ARE MADE BETWEEN REPORTED OBSERVATIONS ON THE BEHAVIOR OF PILE GROUPS FROM MODEL AND FIELD TESTS AND THE BEHAVIOR PREDICTED BY THE THEORY. IT IS FOUND THAT, AS WELL AS PREDICTING THE CORRECT TRENDS, THE THEORY GIVES QUANTITATIVE VALUES WHICH ARE IN REASONABLE AGREEMENT WITH THE OBSERVED VALUES. /RRL/ A/

  • Availability:
  • Supplemental Notes:
    • Vol 18, No 4, PP 449-471, 21 FIG, 4 TAB, 12 REF
  • Corporate Authors:

    Road Research Laboratory /UK

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  • Authors:
    • POULOS, H G
  • Publication Date: 0

Media Info

  • Serial:
    • GEOTECHNIQUE
    • Volume: 4
    • Issue Number: 3
    • Publisher: Thomas Telford Limited
    • ISSN: 0016-8505

Subject/Index Terms

Filing Info

  • Accession Number: 00232105
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Jun 22 1970 12:00AM