DEFORMATION CHARACTERISTICS AT SMALL STRAINS OF SEDIMENTARY SOFT ROCKS BY TRIAXIAL COMPRESSION TESTS

It is shown that in triaxial compression tests of sedimentary soft rocks, axial strains from the axial displacement of the loading piston or specimen cap could be totally unreliable due to bedding errors at the top and bottom ends of a specimen. A local deformation transducer was used to measure axial strains free from the bedding error continuously from less than 0.001% to about 1%. At strains less than about 0.001% the deformations are virtually linear, recoverable and strain rate-independent and their values of Young's modulus Emax are virtually the same as those obtained from field shear wave velocities. The deformations become non-linear before strain reaches 0.01%. At a strain of 0.1% and at the stress level of half the peak strength, which are the typical largest strain and stress levels in soft rock at working load levels, the secant Young's moduli are still about half of Emax. (A)

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

  Thomas Telford Limited

  London,   United Kingdom 
• Authors:
  • Kim, Y-S
  • Tatsuoka, F
  • OCHI, K
• Publication Date: 1994-9

Language

• English

Media Info

• Features: References;
• Pagination: p. 461-78
• Serial:
  • GEOTECHNIQUE
  • Volume: 44
  • Issue Number: 3
  • Publisher: Thomas Telford Limited
  • ISSN: 0016-8505

Subject/Index Terms

• TRT Terms: Compression; Deformation; Elasticity (Mechanics); Field tests; Rock mechanics; Soft soils; Stiffness; Test procedures; Triaxial shear tests
• Old TRIS Terms: Softness
• ITRD Terms: 5905: Compressibility; 5532: Compression; 5595: Deformation; 5912: Elasticity; 6226: In situ; 5757: Rock mechanics; 5931: Stiffness; 6288: Test method; 5566: Triaxial
• Subject Areas: Geotechnology;

Filing Info

• Accession Number: 00677382
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: May 25 1995 12:00AM