ON THE APPLICABILITY OF THE CONCEPT OF PLASTIC FAILURE IN SLIP SURFACE ANALYSIS IN SOIL

In calculating the factor of safety in slip surface analysis, it is assumed that soil has a definite shear strength, that this is simultaneously mobilised along the entire slip surface, and that the mobilised shear strength is exclusively determined by forces acting on the sliding mass, forces outside this being ignored. However, standard tests determine the shear strength only for the test conditions in question, and the peak strength attained is dependent on the rate of loading employed. Shear strength is influenced by geometry, groundwater conditions, drainage, rate of loading and deformation, overconsolidation ratio, clay type, restraint on the mass, brittleness index and stress due to loads acting outside the sliding mass. Progressive failure mechanisms are also ignored. Failure to consider loads and stresses outside the boundaries of the sliding mass, and utilisation of the shear strength of the soil for a number of different loading systems, assuming that no interaction takes place between these, are major sources of error. A modified analytical procedure is proposed in which the interaction between different loads is taken into consideration by evaluating the mean stress increments due to these loads, and by estimating the extent or the zones of interaction. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00422177
• Corporate Authors:

  Svenska Vag-Och Vattenbyggaren Riksforband

  Regeringsgaten 98
  S-11139 Stockholm,   Sweden 
• Authors:
  • Bernander, S
  • Svensk, I
  • Carlsson, C A
• Publication Date: 1979

Media Info

• Features: Figures; References;
• Pagination: p. 39-43
• Serial:
  • Vag-Och Vattenbyggaren
  • Volume: 25
  • Issue Number: 7/8
  • Publisher: Svenska Vag-Och Vattenbyggaren Riksforband
  • ISSN: 0042-2177

Subject/Index Terms

• TRT Terms: Clay; Failure; Force; Loads; Mathematical models; Performance tests; Plasticity; Plastics; Shear strength; Slip surfaces; Soils; Strength of materials; Tests
• ITRD Terms: 4177: Clay; 5520: Failure; 5421: Force; 5567: Load; 6473: Mathematical model; 5922: Plasticity; 5531: Shear; 5794: Slip surface (soil mech); 4156: Soil; 5544: Strength (mater); 6255: Test
• Subject Areas: Geotechnology;

Filing Info

• Accession Number: 00311917
• Record Type: Publication
• Source Agency: Swedish National Road and Transport Research Institute (VTI)
• Files: ITRD, TRIS
• Created Date: Mar 12 1981 12:00AM