Numerical study of the bearing capacity for two interfering strip footings on sands

Abstract Current studies of bearing capacity for shallow foundations tend to rely on the hypothesis of an isolated footing. In practice a footing is never isolated; it is mostly in interaction with other footings. This paper focuses on a numerical study using the finite-difference code Fast Lagrangian Analysis of Continua (FLAC), to evaluate the bearing capacity for two interfering strip footings, subjected to centered vertical loads with smooth and rough interfaces. The soil is modeled by an elasto-plastic model with a Mohr–Coulomb yield criterion and associative flow rule. The interference effect is estimated by efficiency factors, defined as the ratio of the bearing capacity for a single footing in the presence of the other footing to that of the single isolated footing. The efficiency factors have been computed individually to estimate the effects of cohesion, surcharge, and soil weight using Terzaghi’s equation, both in a frictional soil with surcharge pressures and in a cohesive-frictional soil with surcharge pressures. The results have been compared with those available in the literature.

[1]  George Geoffrey Meyerhof,et al.  Some recent research on the bearing capacity of foundations , 1963 .

[2]  D. V. Griffiths.  COMPUTATION OF BEARING CAPACITY FACTORS USING FINITE ELEMENTS , 1982 .

[3]  Radoslaw L. Michalowski,et al.  AN ESTIMATE OF THE INFLUENCE OF SOIL WEIGHT ON BEARING CAPACITY USING LIMIT ANALYSIS , 1997 .

[4]  A.P.S. Selvadurai,et al.  Influence of Nonassociativity on the Bearing Capacity of a Strip Footing , 2001 .

[5]  K. Terzaghi.  Theoretical Soil Mechanics , 1943 .

[6]  Hans L. Erickson,et al.  Bearing Capacity of Circular Footings , 2002 .

[7]  Aleksandar S. Vesic,et al.  Analysis of Ultimate Loads of Shallow Foundations , 1973 .

[8]  G. P. Raymond,et al.  Bearing capacity of three closely-spaced footings on sand , 1984 .

[9]  Braja M. Das,et al.  BEARING CAPACITY OF TWO CLOSELY-SPACED SHALLOW FOUNDATIONS ON SAND , 1983 .

[10]  J. Kumar,et al.  Interference of Multiple Strip Footings on Sand Using Small Scale Model Tests , 2008 .

[11]  Jyant Kumar,et al.  Bearing capacity of two interfering footings , 2008 .

[12]  Arvind Kumar,et al.  Closely Spaced Footings on Geogrid-Reinforced Sand , 2003 .

[13]  J M West,et al.  OBLIQUE LOADING RESULTING FROM INTERFERENCE BETWEEN SURFACE FOOTINGS ON SAND , 1965 .

[14]  Abdul-Hamid Soubra,et al.  Upper-Bound Solutions for Bearing Capacity of Foundations , 1999 .

[15]  Scott W. Sloan,et al.  Numerical limit analysis solutions for the bearing capacity factor Nγ , 2005 .

[16]  R. Borst,et al.  POSSIBILITIES AND LIMITATIONS OF FINITE ELEMENTS FOR LIMIT ANALYSIS , 1984 .

[17]  Jyant Kumar,et al.  Upper bound limit analysis for finding interference effect of two nearby strip footings on sand , 2007 .

[18]  Jyant Kumar,et al.  Ultimate Bearing Capacity of Two Interfering Rough Strip Footings , 2007 .

[19]  K T Law,et al.  Determination of bearing capacity of shallow foundations without using superposition approximation , 2003 .

[20]  L. Prandtl,et al.  Über die Härte plastischer Körper , 1920 .

[21]  Mahmoud Ghazavi,et al.  Interference effect of shallow foundations constructed on sand reinforced with geosynthetics , 2008 .

[22]  Harvey J. Burd,et al.  Numerical studies of bearing-capacity factor Nγ , 1997 .

[23]  J. Brinch Hansen.  AKADEMIET FOR DE TEKNISKE VIDENSKABER , 2008 .

[24]  J. G. Stuart.  Interference Between Foundations, with Special Reference to Surface Footings in Sand , 1962 .