AN EXPERIMENTAL STUDY OF THE STRESS STRAIN CHARACTERISTICS OF A 'WET' CLAY AND THEIR RELEVANCE TO SETTLEMENT ANALYSIS

THE STRESS-STRAIN BEHAVIOR OF "WET" CLAY UNDER TRIAXIAL COMPRESSION TEST CONDITIONS HAS BEEN SUBJECTED TO DETAILED EXPERIMENTAL INVESTIGATION. THE TEST ROUTINE CONSISTED OF ALTERNATING INCREMENTS OF SHEAR (BOTH DRAINED AND UNDRAINED) AND CONSOLIDATION UNDER CONSTANT DEVIATOR STRESS. A WIDE RANGE OF STRESSES AND WATER CONTENTS WAS ENCOMPASSED IN TESTS ON A SINGLE SAMPLE AND INCREMENTS OF VARYING MAGNITUDE WERE USED. THE STATE BOUNDARY SURFACES GENERATED IN THE ABOVE MANNER CORRESPOND TO STATES OF THE CLAY WHICH ARE PHYSICALLY ATTAINABLE UNDER CONDITIONS OF ANISOTROPIC STRESS. THIS CONTRASTS WITH THE HYPOTHESIS IMPLICIT IN THE CAMBRIDGE THEORY THAT TH* SURFACE OBTAINED BY CONNECTING THE COORDINATES FROM SHEAR TESTS ON ISOTROPICALLY CONSOLIDATED SMAPLES AT DIFFERENT WATER CONTENTS CAN BE USED TO PREIDICT THE ANISOTROPIC BEHAVIOR WHEN MOVING FROM POINT TO POINT ON THIS SURFACE IN AN ARBITRARY FASHION. IN THE FIRST PART, THE VARIOUS STATE BOUNDARY SURFACES ARE COMPARED AND POINTS OF SIMILARITY AND DIVERGENCE DISCUSSED. IN THE SECOND PART, THE ALL-IMPORTANT STRESS-STRAIN PROPERTIES ARE DISCUSSED. THE STRESS-STRAIN CURVE FOR UNDRAINED SHEAR FOLLOWING CONSOLIDATION UNDER CONSTANT DEVIATOR STRESS IS SHOWN TO POSSESS AN INITIALLY STEEP PORTION BUT LATER CONFORMS IN SHAPE TO THE CURVE FOR AN UNDRAINED TEST ON AN ISOTROPICALLY CONSOLIDATED SAMPLE. THE CAMBRIDGE THEORY DOES NOT SPECIFICALLY TAKE THIS LATTER PROPERTY INTO ACCOUNT. NEVERTHELESS, ITS MAIN SUCCESS LIES IN THE REASONABLY GOOD AGREEMENT WITH THE RESULTS OF DRAINED TESTS WHICH CAN BE CONSIDERED TO CONSIST OF A SERIES OF VERY SMALL INCREMENTS OF UNDRAINED SHEAR AND ONSOLIDATION. THE ABOVE AGREEMENT IS SHOWN TO BE AT THE EXPENSE OF SATISFACTORY AGREEMENT WITH THE RESULTS OF UNDRAINED TESTS ON ISOTROPICALLY CONSOLIDATED SAMPLES. THE EFFECT OF CREEP UNDER CONSTANT APPLIED STRESSES AT VARIOUS STAGES OF SHEAR AND CONSOLIDATION WAS EXTENSIVELY INVESTIGATED AND ITS IMPORTANCE ON THE SUBSEQUENT STRESS-STRAIN BEHAVIOR IS EMPHASIZED. FINALLY, A METHOD OF SETTLEMENT ANALYSIS IS PROPOSED WHICH COMBINES SOME OF THE FEATURES OF A UNIQUE STATE E OUNDARY SURFACE WITH THOSE OF A STESS PATH METHOD. /AUTHOR/

  • Supplemental Notes:
    • REP NO TR NO.15
  • Corporate Authors:

    Commonwealth Scientific & Industrial Research Org

    314 Albert Street
    East Melbourne, Victoria,   Australia 
  • Authors:
    • Newland, P L
  • Publication Date: 1973

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 71 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00236748
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 15 1974 12:00AM