PLASTIC AND RESILIENT PROPERTIES OF HEAVY CLAY UNDER REPETITIVE LOADINGS

This investigation was conducted to determine the effect of specimen stiffness on the relationship between elastic and plastic strain, rutting potential, and resilient modulus and Poisson's ratio of heavy clay. Specimens were compacted to various California Bearing Ratio (CBR) values and subjected to either 1,000 or 50,000 repetitive stress applications in a triaxial compression chamber. The plastic and recoverable strains were monitored from which the rutting potential and resilient modulus could be determined. CBR and unconfined compression strength (UCS) tests were conducted for supplemental information. The plastic axial strains were found to increase with number and magnitude of axial stress repetitions and to be dependent upon specimen stiffness. The resilient modulus was found to decrease initially with stress repetitions, followed in some cases by a gradual increase with additional repetitions. It was also dependent upon specimen stiffness, deviator stress magnitude, and confining pressure. The magnitude of conditioning stress up to 70 percent of the static UCS was found to have little effect on M sub r values. The relationship between elastic and plastic strain is dependent upon specimen stiffness. Poisson's ratio was found to be insensitive to number and magnitude of repetitive stress applications, confining pressure, and specimen stiffness. /Author/

• Corporate Authors:

  U.S. Army Waterways Experiment Station

  3909 Halls Ferry Road
  Vicksburg, MS  United States  39180-6199
• Authors:
  • Townsend, F C
  • Chisholm, E E
• Publication Date: 1976-11

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 68 p.

Subject/Index Terms

• TRT Terms: Accelerated tests; Bearing capacity; California bearing ratio; Clay; Compression; Deformation curve; Deviatoric stress; Material resilience; Mechanical elasticity; Mechanical strain; Pavement ruts; Plastic deformation; Plasticity; Poisson ratio; Repeated loads; Specimens; Stiffness
• Uncontrolled Terms: Axial strain; Rut; Triaxial compression
• Old TRIS Terms: Bearing values; Deviator stress; Heavy clay; Poissons ratio; Unconfined compression tests
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00153351
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: Tech. Rpt. S-76-16 Final Rpt.
• Contract Numbers: DOT-FA73WAI-377
• Files: TRIS, ATRI
• Created Date: Sep 28 1977 12:00AM