TENSILE STRENGTH OF COMPACTED SOILS

THE TENSILE STRENGTH OF COMPACTED SOILS AND ITS VARIATION WITH RESPECT TO MOLDING WATER CONTENT WERE DETERMINED BY DIAMETRAL COMPRESSION TESTS (THE BRAZILIAN TEST). THE RATIO OF UNCONFINED COMPRESSIVE STRENGTH AND TENSILE STRENGTH AT OPTIMUM MOISTURE CONTENT (OMC) AND THE RELATIONSHIPS OF THIS RATIO TO SIMPLE SOIL PROPERTIES WERE ALSO DETERMINED. PROPER LOAD DISTRIBUTION, TO ENSURE TENSILE FAILURE, WAS ACCOMPLISHED BY PLACING A NARROW PAD OF RUBBER BETWEEN THE SPECIMEN AND THE LOADING PLATES. SIX SOIL TYPES COVERING A WIDE RANGE OF PLASTICITY CHARACTERISTICS WERE EMPLOYED. THE TESTS WERE CONDUCTED, FOR EACH SOIL, AT MOLDING WATER CONTENTS ON EITHER SIDE OF THE OMC. THE RESULTS SHOWED THAT IN DIAMETRAL COMPRESSION TESTS THE TENSILE STRENGTH OF COMPACTED SOILS INCREASES WITH AN INCREASE IN MOLDING WATER CONTENT UP TO A LIMIT BELOW THE OMC AND THEN DECREASES. THE RATIO OF UNCONFINED COMPRESSIVE STRENGTH AND TENSILE STRENGTH VARIED FROM 6 TO 12 AT THE OMC. FOR SOILS OF LOW TO MEDIUM PLASTICITY THIS RATIO DECREASES WITH INCREASING LIQUID LIMIT AND PLASTICITY INDEX. EVERY SPECIMEN COMPACTED AT OMC OR WET OF OPTIMUM DEVELOPED A VERTICAL CRACK ON ITS FACE, ALWAYS STARTING AT THE CENTER OF THE LOADED DIAMETER AND PROGRESSING ALONG IT TO THE PACKING STRIPS. IT IS CONCLUDED THAT COMPACTION DRY OF OPTIMUM RESULTS IN A DECREASE IN FLEXIBILITY, AND AN INCREASE IN MOLDING WATER CONTENT FROM DRY TO OPTIMUM TO OMC AND ABOUT 2% WET OF OPTIMUM INCREASES THE FLEXIBILITY OF COMPACTED SOILS WHILE TENSILE STRENGTH DECREASES. COMPACTION DRY OF OMC WOULD THEREFORE BE UNDESIRABLE WHEN WHEN LARGE DIFFERNTIAL SETTLEMENTS ARE ANTICIPATED IN EMBANKMENTS. IT IS RECOMMENDED THAT THE DIAMETRAL COMPRESSION TEST BE USED FOR DETERMINING THE TENSILE STRENGTH OF COMPACTED SOILS.

  • Supplemental Notes:
    • Vol 96, No SM6, PP 2185-2190, 4 FIG, 3 TAB, 4 REF, 1 APP
  • Authors:
    • Narain, J
    • Rawat, P C
  • Publication Date: 1970-11

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Filing Info

  • Accession Number: 00235852
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 3 1971 12:00AM