INDRAINED CREEP IN A SENSITIVE CLAY

WHEN SUBJECTED TO SUSTAINED LOAD, AN UNDRAINED TRIAXIAL SPECIMEN OF CLAY EXHIBITS A STEADY TIME-DEPENDENT INCREASE IN BOTH PORE PRESSURE AND AXIAL STRAIN. CONTINUING UNDRAINED CREEP MAY OFTEN RESULT IN A COLLAPSE OF THE SAMPLE AFTER LONG PERIODS OF TIME HAVE ELAPSED. THE OBSERVED IS ANALYZED IN TERMS OF EFFECTIVE STRESS-STRAIN RELATIONSHIPS. TYPICAL UNDRAINED CREEP DATA FROM TESTS ON LEDA CLAY ARE PRESENTED, AND IT IS SHOWN THAT DURING CREEP THE EFFECTIVE STRESS STATE OF THE SAMPLE SHIFTS WITH TIME TOWARDS THE FAILURE ENVELOPE FOR THE CLAY. A SIMPLIFIED THEORETICAL ANALYSIS OF THE PROBLEM ENABLES TWO EQUATIONS TO BE DERIVED WHICH SUGGEST THAT CREEP IN PORE PRESSURE IS PROPORTIONAL TO MEAN EFFECTIVE STRESS, AND THAT CREEP STRAIN AND PORE PRESSURE ARE DIRECTLY RELATED. THE PRACTICAL SIGNIFICANCE OF UNDRAINED CREEP IS OUTLINED WITH PARTICULAR REFERENCE TO THE CONSTRUCTION AT NEW LISKEARD, ONTARIO, OF A HIGHWAY EMBANKMENT ON A THICK DEPOSIT OF SENSITIVE CLAY. PIEZOMETER READINGS INDICATED THAT AFTER THE COMPLETION OF CONSTRUCTION A SIGNIFICANT BUILD-UP IN PORE WATER PRESSURE OCCURRED, THIS BEING ACCOMPANIED BY INCREASING SETTLEMENTS THROUGHOUT THE CLAY MASS. /AUTHOR/

  • Availability:
  • Supplemental Notes:
    • Vol 19, No 4, PP 515-529
  • Publication Date: 1969-12

Media Info

  • Serial:
    • GEOTECHNIQUE
    • Publisher: Thomas Telford Limited
    • ISSN: 0016-8505

Subject/Index Terms

Filing Info

  • Accession Number: 00235634
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 13 1970 12:00AM