MECHANICS OF FRACTURE AND CRACKING IN SOIL-CEMENT BASE

THE CRACKING IN A SOIL-CEMENT BASE IS EXAMINED USING GRIFFITH'S THEORY OF BRITTLE FRACTURE. FLEXURAL TESTS ARE PERFORMED ON SOIL-CEMENT BEAMS WITH CRACK-SIMULATING NOTCHES TO DETERMINE THE CRITICAL STRAIN ENERGY-RELEASE-RATE ASSOCIATED WITH THE RAPID EXTENSION OF THE CRACK. MODEL STUDIES ARE MADE TO EVALUATE THE CRACK PROPAGATION IN A SOIL-CEMENT PAVEMENT BASE. THE VARIATIONS OF CRITICAL STRAIN ENERGY RELEASE-RATE ACCORDING TO SOIL TEXTURE, CLAY MINERAL PRESENT, AND THE TIME RATE OF LOADING, AS WELL AS ITS INDEPENDENCE OF THE NOTCH GEOMETRY INDICATE THAT THE CRITICAL STRAIN IS A ENERGY-RELEASE-RATE PHYSICAL PROPERTY OF THE CEMENT-TREATED SOIL. FRACTURE TOUGHNESS, A FUNCTION OF THE STRESS INTENSITY FACTOR K AND THE CRACK EXTENSION FORCE G, IN ACCORD WITH FRACTURE MECHANICS CONCEPTS, EXHIBITS AN INVERSE RELATION WITH THE RATE OF CRACK PROPAGATION. IN ADDITION, THE CRACK PATTERNS OBSERVED IN THE MODEL SLABS ARE IN KEEPING WITH THE FUNDAMENTAL POSTULATE OF GRIFFITH. IN SIMPLE AND SYMMETRICAL CASES, THE CEMENT BASE UPON CRACKING TENDS TO FORM A PATTERN OF HEXAGONS. WHEN THE MATERIAL IS MORE BRITTLE, THE CRACKS FORM RATHER POORLY DEFINED IRREGULAR RANDOM ORTHOGONAL POLYGONS, WITH THE VARIOUS CRACKS MEETING PRIMARILY IN THREE-WAY NODES. /AUTHOR/

  • Supplemental Notes:
    • Hpr-1(2), STATE STUDY NO 48
  • Corporate Authors:

    University of Mississippi, University

    P.O. Box 1848
    University, MS  USA  38677

    Mississippi State Highway Department

    P.O. Box 1850
    Jackson, MI  USA  39215

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  USA  20590
  • Authors:
    • George, K P
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00230688
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS, STATEDOT
  • Created Date: Aug 15 2004 2:20AM