DETERMINATION OF ECONOMIC DRIVING DEPTH AND OF DRIVING STRESSES IN REINFORCED CONCRETE PILES

DYNAMIC BEARING FORCE INCREASES WITH THE DECREASE OF PENETRATION SETS AND DEFORMATIONS. ITS MAXIMUM VALUE WILL BE ATTAINED WHEN THE RESIDUAL PART APPROACHES 0. ELASTIC DEFORMATIONS, HOWEVER, INCREASE WITH THE DYNAMIC BEARING FORCE, AND THEREFORE WILL INCREASE WITH PENETRATION RESISTANCE AND TEND TOWARDS A FAIRLY CONSTANT MAXIMUM VALUE. THUS, BEYOND THE LIMIT WHERE RESIDUAL PENETRATION DISAPPEARS, SUCCESSIVE DRIVING WILL NOT PRODUCE ANY FURTHER INCREASE OF BEARING CAPACITY AND TOTAL DRIVING ENERGY WILL BE CONSUMED BY ELASTIC DEFORMATION LEADING TO A GRADUAL DESTRUCTION OF THE PILE. THIS REASONABLE PENETRATION DEPTH MAY BE OBTAINED EITHER BY THE MAXIMUM VALUE OF THE SPECIFIC INCREASE IN BEARING CAPACITY AS RELATED TO THE UTILIZED DRIVING ENERGY OR BY THE 0 VALUE OF THE RATIO, BEARING FORCE/ELASTIC DEFORMATION PLOTTED AGAINST PENETRATION DEPTH. THE AVERAGE DYNAMIC COMPRESSION STRESS IN THE PILE MAY BE OBTAINED BY HOOKE'S LAW FROM THE ELASTIC DEFORMATION OF THE PILE. WITH THIS METHOD THE DEFORMATION MAY BE MEASURED ONLY TOGETHER WITH THAT OF THE SOIL, HOWEVER. THE AUTHOR DESCRIBES A METHOD BY WHICH THE ELASTIC DEFORMATION OF THE PILE MIGHT BE SEPARATED FROM THAT OF THE SOIL WHEN SIMULTANEOUS MEASUREMENTS ARE EFFECTED AT TWO LEVELS. /LCPC/RRL/A/

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Filing Info

  • Accession Number: 00214919
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Sep 21 1970 12:00AM