BEARING CAPACITY OF END-BEARING PILES DRIVEN TO ROCK

BECAUSE OF THE VERY HIGH LOADS WHICH ARE OFTEN TRANSFERRED THROUGH THE PILE POINT TO THE UNDERLYING ROCK, AN INVESTIGATION WAS INITIATED TO EVALUATE SOME OF THE FACTORS AFFECTING THE POINT BEARING CAPACITY OF ROCK. THE EFFECTS OF REPETITIVE LOADS, DISTANCE FROM EXISTING OPEN AND CLOSED CRACKS, AND THE SIZE OF THE LOADED AREA WERE INVESTIGATED. TEST RESULTS INDICATE THAT THE BEARING CAPACITY DECREASES RAPIDLY WITH INCREASING NUMBER OF LOAD CYCLES. THE FATIGUE STRENGTH AFTER ABOUT 6,000 CYCLES IS ONLY 30 TO 40% OF THE ULTIMATE "STATIC" STRENGTH. THE OPEN AND CLOSED VERTICAL CRACKS AFFECTED THE POINT BEARING CAPACITY APPRECIABLY. THE ULTIMATE STRENGTH IS 25% OF THE POINT BEARING CAPACITY OF THE UNCRACKED ROCK WHEN THE LOAD IS APPLIED AT AN OPEN VERTICAL CRACK. THE BEARING CAPACITY DECREASED WITH INCREASING SIZE OF THE LOADED AREA. THE ULTIMATE STRENGTH IS REDUCED BY 20% WHEN THE DOWEL DIAMETER INCREASES FROM 20 MM (0.79 IN) TO 60 MM (2.36 IN). /AUTHOR/

  • Authors:
    • Rehnman, S
    • BROMS, B B
  • Publication Date: 1972

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  • Accession Number: 00236399
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 17 1973 12:00AM