Effect of Footing Roughness on Bearing Capacity Factor N

The effect of interface friction angle (delta) between the footing and underlying soil mass on the bearing capacity factor N and subscript gamma was examined by using the upper bound limit analysis, finite elements, and linear programming. The analysis was carried out by employing velocity discontinuities along all the interfaces of the chosen triangular elements. The development of the plastic strains within elements was incorporated by using an associated flow rule. It was clearly noted that an increase in delta leads to a continuous increase in N and subscript gamma. With delta = phi, the magnitude of N and subscript gamma becomes almost the same as that for a perfectly rough foundation, that is, when no slippage takes place between the footing and underlying soil mass. The size of the plastic zones increases with increase in delta and phi. The obtained values of N and subscript gamma, for perfectly smooth and perfectly rough footings, compare quite favorably with those reported in literature. The study demonstrates that in the case when delta is smaller than phi, the assumption of a perfectly rough footing will lead to an unsafe prediction of the ultimate bearing capacity.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/3519342
• Authors:
  • Kumar, Jyant
  • Kouzer, K M
• Publication Date: 2007-5

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 502-511
• Serial:
  • Journal of Geotechnical and Geoenvironmental Engineering
  • Volume: 133
  • Issue Number: 5
  • Publisher: American Society of Civil Engineers
  • ISSN: 1090-0241
  • Serial URL: http://ojps.aip.org/gto

Subject/Index Terms

• TRT Terms: Bearing capacity; Failure; Failure analysis; Finite element method; Footings; Foundations; Leakage; Linear programming; Mathematical prediction; Numerical analysis; Optimization; Plasticity; Roughness; Shear zones; Soils; Ultimate load design
• Uncontrolled Terms: Friction angle
• Subject Areas: Data and Information Technology; Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 01052306
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 2 2007 8:07AM