A PLASTICITY MODEL FOR THE DEFORMATION OF SANDS DURING ROTATION OF PRINCIPAL STRESS DIRECTION. NUMERICAL MODELS IN GEOMECHANICS. NUMOG III. PROCEEDINGS OF THE 3RD INTERNATIONAL SYMPOSIUM HELD AT NIAGARA FALLS, CANADA, 8-11 MAY 1989

A model for the deformation of sand during rotation of principal stress directions is presented. For simplicity in discussion plane strain condition is assumed but the model can be extended to a more general three-dimensional formulation. The development of the model is based on the results of a series of carefully executed tests using a hollow cylindrical apparatus. The tests are concerned with the yielding and flow of sand during loading conditions where not only the magnitudes but also the directions of the principal stresses are changed. A plasticity formulation within the framework of the bounding surface plasticity theory (dafalias, 1984) is used. This theory is extended to model the experimental results showing the dependency of yielding and flow of sand on the stress increment direction during rotation of principal stress directions. A new stress-dilatancy relation is used to take into effect the non-coaxiality of the principal stress and strain increment directions. A collection of nested contours of equal plastic hardening modulus similar to the nested yield surfaces formulation of mroz (1967) is used to calculate the magnitude of plastic deformation.(a) for the covering abstract of this conference see IRRD 824029.

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• Corporate Authors:

  Elsevier Science Publishers

  Crown House, Linton Road
  Barking, Essex IG11 8JU,   England 
• Authors:
  • Gutierrez, M
  • Ishihara, K
  • Towhata, I
• Publication Date: 1989

Language

• English

Media Info

• Pagination: p. 53-60
• Serial:
  • Publication of: Elsevier Applied Science Publishers Limited
  • Publisher: Elsevier Science Publishers

Subject/Index Terms

• TRT Terms: Conferences; Deformation; Dilatancy; Flow; Mathematical models; Plastic deformation; Plasticity; Sand; Soil mechanics; Soils; Stresses
• Subject Areas: Data and Information Technology; Geotechnology;

Filing Info

• Accession Number: 00497910
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• ISBN: 1-85166-425-4
• Files: ITRD, TRIS
• Created Date: Sep 30 1990 12:00AM