THEORY, RESISTANCE OF A DRILLED SHAFT FOOTING TO OVERTURNING LOADS

THE THEORETICAL DEVELOPMENT IS PRESENTED TO DESIGN DRILLED SHAFT FOOTINGS TO SUPPORT SERVICE STRUCTURES FOR A HIGHWAY SYSTEM. THE APPLICATION FOR THE THEORY DEVELOPED DEPENDS ON THE ACCURATE EVALUATION OF THE VARIOUS SOIL COEFFICIENTS BY FOOTING TESTS. THIS EVALUATION IS A COMMON CHARACTERISTIC OF ALMOST ALL APPLIED THEORY IN SOIL MECHANICS. THE COEFFICIENTS OF ACTIVE AND PASSIVE EARTH PRESSURE DEFINED BY RANKINE FOR THE CASE OF FRICTIONLESS WALLS OF SEMI-INFINITE LENGTH ARE REVIEWED. SINCE THE PROBLEM UNDER CONSIDERATION IS NOT THE SAME AS TERZAGHI'S BECAUSE OF FOOTING FRICTION AND THE RELATIVELY NARROW FOOTING WIDTH, THE DIFFERENCES IN THE END SOLUTION ARE AMPLIFIED. A MODIFICATION IS SUGGESTED BY AN EMPIRICALLY DETERMINED MULTIPLICATION FACTOR. SOLUTIONS TO THE EQUILIBRIUM EQUATIONS INVOLVED ARE PROGRAMED FOR THE IBM 7094. THE SENSITIVITY OF THIS SOLUTION IS NOW BEING CHECKED WITH VARIOUS SOIL PARAMETERS. THIRTY MODEL TESTS HAVE BEEN RUN ON SOILS VARYING FROM COHESIONLESS SANDS TO HIGHLY PLASTIC CLAYS.

  • Supplemental Notes:
    • Res Rept 105-1, 14 PP, 8 FIG
  • Corporate Authors:

    Texas Transportation Institute

    Texas A&M University System, 1600 E Lamar Boulevard
    Arlington, TX  United States  76011
  • Authors:
    • Ivey, D L
  • Publication Date: 1968-2

Subject/Index Terms

Filing Info

  • Accession Number: 00203346
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 9 1994 12:00AM