THE BEHAVIOR OF AXIALLY LOADED SHAFTS IN SAND

This study is mainly concerned with analysis of behavior of five full-scale instrumented drilled shafts cast in soil profiles containing sand and test loaded to failure. Two shafts were cast by the dry method and three by the slurry displacement method. From field observations and measurements taken during construction and load tests, important findings were made concerning the construction and the design of drilled shafts. With respect to construction, the slurry displacement method was found to possess a great potential for future use, but this method must be used with care, to prevent the entrapment of mud and sediments at the tip and sides of the shaft and in the concrete. With respect to design, the measured load transfer was correlated with the properties of the sand measured by dynamic penetrometers. Pressure-settlement curves were obtained for the tips of shafts in very dense sand and sand of medium density. The total side load transfer was correlated with the integral over the periphery of the shaft of the product of the effective overburden pressure times the tangent of the effective friction angle. The coefficient of correlation was found to be about 0.7 for shafts with penetrations in sand not exceeding 25 ft. There were indications that this coefficient decreases with depth and, therefore, care must be exercised when the results are extrapolated to deeper shafts. /AUTHOR/

  • Supplemental Notes:
    • This report was prepared for the Texas Highway Department in cooperation with the U.S. Department of Transportation, Federal Highway Administration by the Center for Highway Research, the University of Texas at Austin December 1972.
  • Corporate Authors:

    University of Texas, Austin

    Center for Highway Research, 200 West 21st Street
    Austin, TX  United States  78712
  • Authors:
    • Touma, F T
    • Reese, L C
  • Publication Date: 1972-10

Media Info

  • Features: Figures; Photos; Tables;
  • Pagination: 259 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00262990
  • Record Type: Publication
  • Report/Paper Numbers: CFHR3-5-72-176-1 Intrm Rept
  • Contract Numbers: 35-5-72-176
  • Files: TRIS
  • Created Date: Nov 12 1974 12:00AM