BEARING CAPACITY OF STRIP FOOTING SUPPORTED BY TWO-LAYER C-PHI SOILS

The ultimate bearing capacity of an embedded strip footing supported by two-layer c-phi soils has been investigated using an elasto-plastic finite-element computer program. In the program the footing material is treated as linear elastic and the foundation soils are idealized as nonlinear elastic perfectly plastic materials that obey the yield criterion of Drucker and Prager. The program also considers initial stresses, interface behavior, and tension failure of soil. The analysis was performed on a VAX 11/785 computer. Three soils--a commercial kaolin, a silty clay, and a clayey sand--were selected for analysis of a representative number of soil layer combinations. The analysis was performed for a constant footing width and varying levels of top-layer thickness. The propagation of plastic yield zones under progressive increments of footing load was investigated, and a generalized procedure for determining bearing capacity from computer-generated pressure-settlement curves was proposed. Meanwhile, on the basis of the analysis results, a semiempirical equation was developed for determining ultimate bearing capacity. A comparison with existing theories indicates that the developed equation can provide more-reasonable results than the existing ones can. Additionally, the developed equation is relatively simple and can be easily applied.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1991/1331/1331-009.pdf
• Record URL:
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• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1331, Integrity Testing of Foundations 1991. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Azam, G
  • WANG, M C
• Publication Date: 1991

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 56-66
• Monograph Title: Integrity testing of foundations, 1991
• Serial:
  • Transportation Research Record
  • Issue Number: 1331
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Bearing capacity; Computer programs; Elastoplasticity; Equations; Finite element method; Foundation soils; Kaolin; Sandy clays; Silty clays; Strip footings
• Uncontrolled Terms: Elastic plastic analysis
• Old TRIS Terms: Two-layer soils
• Subject Areas: Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00622277
• Record Type: Publication
• ISBN: 0309051681
• Files: TRIS, TRB
• Created Date: May 31 1992 12:00AM