SMALL-SCALE LOAD TESTS ON DRILLED AND CAST-IN-PLACE CONCRETE PILES

AS A PORTION OF A MORE EXTENSIVE STUDY ON DRILLED AND CAST-IN-PLACE CONCRETE PILES, SPECIAL TESTS WERE CONDUCTED ON SMALL-SCALE PILES WHICH HAD BEEN PLACED IN A 30-IN. CUBE OF LABORATORY COMPACTED SOIL. THE USE OF THESE SMALL-SCALE PILES MADE IT POSSIBLE TO CONDUCT THESE TESTS UNDER MORE UNIFORM SOIL CONDITIONS AND TO PERFORM TESTS THAT WERE NOT PRACTICAL FOR THE LARGER FIELD-INSTALLED PILES. ONE SERIES OF SMALL-SCALE PILES WAS USED TO OBSERVE THE INFLUENCE OF SEVERAL FACTORS ON WATER MOVEMENTS FROM UNSET CONCRETE INTO AN ANNULAR ZONE OF SOIL IMMEDIATELY SURROUNDING THE PILES. THESE TESTS INDICATED THAT WATER MOVEMENTS WERE NEGLIGIBLE, EXCEPT WHEN THE INITIAL WATER CONTENT OF THE COMPACTED SOIL (FOR THE TEST CUBES) WAS SEVERAL PERCENT LOWER THAN THE PLASTIC LIMIT OF THE SOIL. BOTH TENSION AND COMPRESSION LOAD TESTS WERE CONDUCTED ON SMALL PILES AND THE TENSION CAPACITY OF THE PILES WAS FOUND TO BE BETWEEN 0.6 AND 0.7 OF THE COMPRESSION PILE LOAD CAPACITY. OTHER SPECIAL TESTS WERE MADE TO OBSERVE THE NATURE OF SOIL DEFORMATION ADJACENT TO THE PILE SURFACE DURING A LOAD TEST AND THE PORTION OF THE PILE LOAD WHICH WAS RESISTED BY END-BEARING STRESSES AT THE BASE OF THE PILE. /AUTHOR/

• Record URL:
  https://onlinepubs.trb.org/Onlinepubs/hrbproceedings/36/36-013.pdf
• Supplemental Notes:
  • Vol 36, pp 132-145, 10 FIG, 1 REF. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • Dubose, L A
• Publication Date: 1957

Media Info

• Media Type: Digital/other
• Monograph Title: Proceedings of the Thirty-Sixth Annual Meeting of the Highway Research Board, Washington, D.C., January 7-11, 1957
• Serial:
  • Highway Research Board Proceedings
  • Volume: 36
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Boreholes; Cast in place structures; Mathematical models; Skin resistance; Support piles
• Uncontrolled Terms: Models
• Old TRIS Terms: Pile bearing capacities
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00209471
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: May 22 1972 12:00AM