TIME-DEPENDENT BEHAVIOUR OF COMPACTED CLAYS IN TENSION AND COMPRESSION

For a better understanding of the performance of earth and earth-supported structures, especially earth dams, it is essential to define and evaluate variables that determine the deformability of soils and the extent to which these variables are time-dependent. The paper describes the observed time-dependent behaviour of two compacted clays subject to pure bending (stress gradient), uniaxial tension and uniaxial compression. It is shown that time of loading significantly influences the deformation behaviour of compacted soils especially under stress gradient conditions. It has already been established that time of loading affects the strength and failure strain of various soils differently when subject to compression. This observation also seems to be valid for clays tested under stress gradient conditions. This may prove of value in connection with the design of clay cores of earth dams and it throws an interesting light on the behaviour of compacted cores where stress gradients could cause cracking with time. The increase with time of flexural strength and tensile strain at failure of compacted clays is considered to be influenced by many variables of which the important ones are the moisture content and the nature and amount of clay but more work is needed to investigate this aspect. A pair of equations is required to describe the observed creep effects under stress gradient.(a) (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00168505
• Corporate Authors:

  Institution of Civil Engineers

  One Great George Street, Westminster
  London,   United Kingdom  SW1P 3AA
• Authors:
  • Ajaz, A
• Publication Date: 1980-3

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 67-76
• Serial:
  • GEOTECHNIQUE
  • Volume: 30
  • Issue Number: 1
  • Publisher: Thomas Telford Limited
  • ISSN: 0016-8505

Subject/Index Terms

• TRT Terms: Bending; Clay; Compacted clays; Compaction; Compression; Creep; Deformation; Earth dams; Equations; Flexural strength; Loads; Moisture content; Strength of materials; Stresses; Tension; Time; Time dependence
• Uncontrolled Terms: Uniaxial compression; Uniaxial tension
• ITRD Terms: 4177: Clay; 5904: Compaction (state of); 5532: Compression; 5595: Deformation; 3317: Earth dam; 5567: Load; 5544: Strength (mater); 5575: Stress (in material); 5502: Tension; 5414: Time
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00316948
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Feb 6 1981 12:00AM