SOME DEVIATIONS FROM ISOTROPY IN A LIGHTLY OVERCONSOLIDATED CLAY

SPECIMENS OF AN APPARENTLY HOMOGENEOUS CLAY, TRIMMED IN DIFFERENT DIRECTIONS AND TESTED IN UNDRAINED SHEAR, MAY EXHIBIT DIFFERENT DEVIATORIC STRESSES AT FAILURE. ALL SUCH DIFFERENCES ARE COLLECTIVELY REFERRED TO IN CURRENT LITERATURE AS 'ANISOTROPY OF THE UNDRAINED STRENGTH' OF THE CLAY. CONSIDERABLE EFFORT HAS BEEN DIRECTED TOWARD ESTABLISHING THE FORM OF THE DIRECTIONAL VARIATION IN UNDRAINED STRENGTH WITH THE ANGLE OF ROTATION OF THE PRINCIPAL STRESSES OR WITH THE INCLINATION OF THE FAILURE SURFACE. THE PRESENT STUDY SHOWS THAT SOME DEVIATIONS FROM ISOTROPY IN CLAY SOILS ARE RESTRICTED TO THOSE STATES OF STRESS COMMONLY REFERRED TO AS OVERCONSOLIDATED. THESE DEVIATIONS TERMINATE WHEN THE SOIL IS CONSOLIDATED TO A NORMALLY CONSOLIDATED STATE. DIRECTIONAL VARIATIONS IN THE UNDRAINED STRENGTH THAT RESULT FROM THESE DEVIATIONS ARE INFLUENCED BY THE INITIAL STATE OF STRESS IN THE SPECIMEN AS WELL AS BY THE DIRECTION OF THE APPLIED STRESSES. ALTERNATIVE CAUSES FOR THE DIRECTIONAL VARIATION IN THE UNDRAINED STRENGTH OF SOILS ARE DISCUSSED. /AUTHOR/

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 459-67
  • Serial:
    • GEOTECHNIQUE
    • Volume: 22
    • Issue Number: 3
    • Publisher: Thomas Telford Limited
    • ISSN: 0016-8505

Subject/Index Terms

Filing Info

  • Accession Number: 00237032
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Oct 9 1973 12:00AM