FABRIC SYMMETRY AND MECHANICAL ANISOTROPY IN NATURAL SOILS

FABRIC ANALYSES AND TRIAXIAL TESTS HAVE BEEN PERFORMED ON ORIENTED, UNDISTURBED SPECIMENS OF TWO COMMONLY OCCURING SOILS: A RECENT BEACH SAND AND A RESIDUAL SILTY CLAY OF UNIFORM COMPOSITION. THE RESULTS INDICATE THAT BOTH SOILS LACK A VERTICAL N-FOLD AXIS OF SYMMETRY IN THEIR ORIGINAL, PRE-TESTING GEOMETRICAL FABRIC. THEY EXHIBIT ONLY A SINGLE VERTICAL PLANE OF SYMMETRY, I.E., MONOCLINIC SYMMETRY. A VERTICAL N-FOLD AXIS OF SYMMETRY IS ALSO ABSENT IN THE TWO SOILS AS FAR AS SUCH MECHANICAL PROPERTIES AS THE SECANT MODULUS ARE CONCERNED. THE PRESENTLY HYPOTHETICAL SYMMETRY ELEMENTS OF THE SECANT MODULUS DISTRIBUTION PATTERN CAN BE RELATED TO THOSE OF THE ORIGINAL, PRE-TESTING GEOMETRICAL FABRIC, AND THESE IN TURN TO THE MAJOR TERRAIN FEATURES (DIRECTION OF THE COASTLINE, OR THE ORIENTATION OF THE TERRAIN SLOPE). IT IS SUGGESTED THEREFORE THAT CURRENT IDEAS ON THE FREQUENCY OF OCCURENCE OF CROSS-ANISOTROPY ARISING FROM GRAVITATIONAL COMPACTION AND CONSOLIDATION IN NATURAL SOILS NEED TO BE REVIEWED. /AUTHOR/

  • Authors:
    • Lafeber, D
    • Willoughby, D R
  • Publication Date: 0

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  • Accession Number: 00238237
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Conf Paper
  • Files: TRIS
  • Created Date: Dec 4 1973 12:00AM