STRESS EFFECT ON CREEP RATES OF A FROZEN CLAY SOIL

DIFFERENTIAL CREEP TESTS HAVE BEEN CARRIED OUT ON FROZEN CYLINDRICAL CLAY SOIL SAMPLES TO EXAMINE THE INFLUENCE OF STRESS ON CREEP RATES. CONCURRENTLY, INFORMATION WAS OBTAINED CONCERNING TEMPERATURE AND STRUCTURE EFFECTS ON THE STRESS/CREEP RATE RELATIONSHIP. APPROXIMATE LINEARITY BETWEEN LOGARITHM OF AXIAL CREEP RATE AND AXIAL STRESS (SIGMA), FOR STRESSES GREATER THAN TWO-THIRDS THE ULTIMATE COMPRESSIVE STRENGTH AND CONSTANT TEMPERATURE, SUPPORT AN EXPONENTIAL LAW (EXP B TIMES AXIAL STRESS) FOR PREDICTING THE EFFECT OF STRESS ON CREEP RATES. THE HYPERBOLIC SINE LAW CLOSELY APPROXIMATES THE EXPONENTIAL LAW FOR THE HIGH STRESSES USED. THE DATA AND ANALYSIS INDICATE THAT THERMAL ACTIVATION IS INVOLVED IN THE CREEP OF THIS FROZEN CLAY SOIL AND THAT TEMPERATURE (T) SHOULD APPEAR THROUGH AN EXPRESSION OF THE FORM EXP (-DELTAF/RT). AN OBSERVED ACTIVATION ENERGY (DELTAF) CLOSE TO 93.6 KCAL/MOLE APPEARS TO REMAIN CONSTANT OVER A RANGE OF AXIAL STRESSES (600-800 LB/SQ.IN.) AND TEMPERATURES (-12 C TO -18 C). THIS CONSTANT ACTIVATION ENERGY SUPPORTS THE IDEA THAT ONE CREEP MECHANISM PREDOMINATES FOR THESE STRESSES AND TEMPERATURES. EXPERIMENTAL DATA SHOW THAT A LINEAR RELATIONSHIP APPEARS TO EXIST BETWEEN AXIAL STRESS AND RECIPROCAL OF TEMPERATURE FOR CONSTANT CREEP RATES AND TEMPERATURES LOWER THAN -6 C. THIS PROVIDES A MEANS FOR PREDICTING CREEP RATES AT OTHER AXIAL STRESSES AND TEMPERATURES BASED ON LIMITED CREEP DATA. /RRL/(A)

  • Availability:
  • Supplemental Notes:
    • Vol 17, No 1, PP 27-39, 10 FIG, 1 TAB, 13 REF
  • Authors:
    • Andersland, O B
    • Akili, W
  • Publication Date: 1967-3

Media Info

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

Subject/Index Terms

Filing Info

  • Accession Number: 00234668
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Oct 13 1994 12:00AM