DYNAMIC STUDIES ON THE BEARING CAPACITY OF PILES

A LITERATURE REVIEW AND EXPERIMENTAL STUDY WERE CONDUCTED ON THE RELATIONSHIP BETWEEN SELECTED DYNAMIC PARAMETERS AND STATIC BEARING CAPACITY OF PILES. A SIMPLE FORCE-BALANCE THEORY IS PROPOSED WHICH IS CORRELATED WITH EXPERIMENTAL RESULTS OF FULL SCALE AND REDUCED SCALE PILES. THE SIMPLIFIED MODEL USED IN THE STUDY IS BASED ON AN ASSUMED RIGID PILE. ANOTHER EFFORT OF THE STUDY EMPLOYED THE ELASTIC PILE ASSUMPTION WITH THE MODEL FOR THE PILE CONSISTING OF MANY DISCRETE MASSES INTERCONNECTED BY SPRINGS. A COMPUTER PROGRAM WAS DEVELOPED TO STUDY PILE BEHAVIOR. THE FOLLOWING LOAD TESTS WERE PERFORMED UPON COMPLETION OF PILE DRIVING: THE STANDARD OHIO HIGHWAY DEPARTMENT LOAD TEST (M.L. TEST), AND THE CONSTANT RATE OF PENETRATION TEST (C.R.P. TEST). THE RESULTS OF LOAD TESTS INDICATE THAT THE C.R.P. TEST CAN BE MORE RELIABLY AND ACCURATELY PERFORMED THAN THE M.L. TEST. THE LOAD MEASURED IS THE ULTIMATE CAPACITY SO THAT A DIFFERENT FACTOR OF SAFETY IS REQUIRED IN DESIGN THAN IS USED FOR THE OHIO DEPARTMENT OF HIGHWAYS YIELD LOAD. A SUMMARY IS PRESENTED IN A TABLE OF THE RESULTS OF MODEL PILES DRIVEN AND LOAD TESTED. THE WIDE VARIETY OF ULTIMATE LOAD CAPACITIES MEASURED ON THE MODEL PILES IS DISTURBING TO THE CONCEPT OF THE SINGLE LOAD TEST PILE. THESE PILES WERE QUITE CLOSELY SPACED BUT THEIR CAPACITIES DIFFERED RATHER WIDELY. IT IS FELT THAT THE SYSTEM PROPSED WOULD MAKE PRACTICAL THE DYNAMIC TESTING OF MANY PILES.

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Filing Info

  • Accession Number: 00202866
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 28 1970 12:00AM