RESISTANCE OF A DRILLED SHAFT FOOTING TO OVERTURNING LOADS, MODEL TESTS AND CORRELATION WITH THEORY

REPORTED IN THIS PAPER ARE THE RESULTS OF TWENTY-EIGHT MODEL TESTS OF DRILLED SHAFT FOOTINGS SUBJECTED TO OVER- TURNING HORIZONTAL LOADS. THE MODELS ARE GEOMETRICALLY SIMILAR BUT REDUCED BY A FACTOR OF SIX COMPARED TO THE AVERAGE SIZE OF FOOTINGS USED FOR MINOR SERVICE STRUCTURES IN TEXAS. THE SOILS INVESTIGATED RANGE FROM COHESION-LESS SANDS, THROUGH SOILS WITH BOTH COHESION AND AN ANGLE OF SHEAR RESISTANCE, TO CLAYS WITH NO ANGLE OF SHEAR RESISTANCE WHEN TESTED USING THE UNCONSOLIDATED-UNDRAINED QUICK TRIAXIAL COMPRESSION TEST. THE RESULTS OF THE MODEL FOOTING TESTS ARE COMPARED WITH THE THEORY DEVELOPED IN THIS STUDY. IT WAS FOUND THAT THE CONVENTIONAL METHODS OF PREDICTING ULTIMATE LOAD WERE CONSERVATIVE BY AS MUCH AS 500 PER CENT FOR THE COHESIONLESS SANDS AND BY AS LITTLE AS 20 PER CENT FOR THE CLAYS. THE COEFFICIENTS DEVELOPED IN THE NEW THEORETICAL TREATMENT ARE EVALUATED SO THAT THE ULTIMATE LOADS ON THIS TYPE OF FOOTING IN ANY GIVEN SOIL CAN BE PREDICTED. /AUTHOR/

• Supplemental Notes:
  • Res Rept No 105-2, 20 PP, 32 FIG, 5 TAB, 7 REF, 1 APP
• Corporate Authors:

  Texas Transportation Institute

  Texas A&M University System, 1600 E Lamar Boulevard
  Arlington, TX  United States  76011
• Authors:
  • Ivey, D L
  • Koch, K J
  • Raba, C F
• Publication Date: 1968-7

Subject/Index Terms

• TRT Terms: Boreholes; Breaking loads; Footings; Forecasting; Loads; Overturning; Properties of materials; Shafts (Machinery); Shear strength; Soil tests; Soils; Theory
• Uncontrolled Terms: Horizontal loads; Model tests; Soil properties
• Subject Areas: Bridges and other structures; Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00208881
• Record Type: Publication
• Files: TRIS
• Created Date: Mar 18 1994 12:00AM