This technical note describes the results of a study to determine the ultimate bearing capacity of footings in a two-layered C-phi soil system. Empirical equations have been suugested to determine: the average value of cohesion C sub a; the average value of the angle of internal friction, phi sub a; and equivalent significant depth, D sub e, for a layered soil system. With such strength parameters, the determination of the ultimate bearing capacity using the bearing capacity factor N sub c, N sub q, N sub gamma based on the Terzaghi theory avoids complicated procedures and maintains an excellent degree of accuracy. The proposed empirical equations have been examined and compared with results obtained by Button and Srennivasulu; and the values of ultimate bearing capacity, based on the suggested empirical equations, have been compared with those obtained from small-scale laboratory model bearing capacity tests. As the result of the study, it was concluded that the use of design charts presented by various investigators requires considerable time and applies to cohesive soils only. The consideration of the average values of C, phi, and the concept of equivalent significant depth for computing ultimate bearing capacity yields acceptable results for a wide range of C-phi soils.

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  • Accession Number: 00319162
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 15546
  • Files: TRIS
  • Created Date: Jan 19 1981 12:00AM