STRESS-DEFORMATION AND STRENGTH CHARACTERISTICS OF A COMPACTED SHALE

When shales are encountered in road cuts, economic and environmental considerations usually dictate that they be used in adjoining embankments. However, unless special precautions are taken, the stability of a shale embankment can deteriorate with time on account of the nondurable nature of most shales. Previous investigators have developed various tests to classify shales with respect to their hardness, durability and degradability. This paper presents the results of a laboratory investigation to define the effective stress strength parameters of mechanically hard but nondurable shale pieces of a lower Mississippian age formation (new Providence) from the state of Indiana, USA. The initial gradation of crushed shale aggregate, the molding water content, the compaction pressure, and the pre-shear consolidation pressure were adopted as the independent test variables. Triaxial specimens formed by kneading compaction were back pressure saturated under a low effective confining pressure, consolidated to the desired isotropic effective stress, and sheared undrained at a constant rate of deformation. The compaction characteristics, the volume changes during saturation and consolidation, and the undrained shearing response including pore water pressure changes were studied. The effective stress strength parameters evaluated at maximum deviator stress were found to be essentially independent of the initial conditions, except for loose uncompacted aggregate. The compaction characteristics, the volume change characteristics, the induced pore water pressure changes, and the consolidated undrained strength were found to be greatly dependent on the initial conditions. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0727700693
• Supplemental Notes:
  • Proceedings from the Clay Fills Conference, held at the Institution of Civil Engineers, November 14-15, 1978.
• Corporate Authors:

  Institution of Civil Engineers

  One Great George Street, Westminster
  London,   United Kingdom  SW1P 3AA
• Authors:
  • Abeysekera, R A
  • Lovell, C W
  • Wood, L E
• Conference:
  • Proceedings from the Clay Fills Conference, held at the Institution of Civil Engineers, November 14-15, 1978.
• Publication Date: 1979

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 1-14

Subject/Index Terms

• TRT Terms: Compaction; Compression; Conferences; Consolidation; Deformation; Density; Effective stress; Forming; Moisture content; Pore water pressures; Pressure; Shale; Shear strength; Soil compaction; Soil stabilization; Strength of materials; Stresses; Tests; Undrained shear strength; Volume changes
• Geographic Terms: United States
• Old TRIS Terms: Molding (Process)
• ITRD Terms: 5904: Compaction (state of); 5532: Compression; 8525: Conference; 5791: Consolidation (soil); 5595: Deformation; 5908: Density; 5762: Pore water pressure; 4168: Shale; 5531: Shear; 5575: Stress (in material); 6255: Test; 8122: USA
• Subject Areas: Geotechnology; Highways; I51: Earthworks and Soil Drainage;

Filing Info

• Accession Number: 00311812
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 0-7277-0069-3
• Files: ITRD, TRIS
• Created Date: Nov 19 1980 12:00AM