Theoretical Bearing Capacity of Very Shallow Footings

by Lawrence A. Larkin,

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1968, Vol. 94, Issue 6, Pg. 1347-1360

Document Type: Journal Paper

Discussion: (See full record)

Abstract: The bearing capacities of very shallow, perfectly smooth strip and circular footings are obtained by integration of the equations of plastic equilibrium of soils. The equations are integrated numerically by a finite difference approximation based on the method of characteristics. Calculations are carried out for cohesionless soils with angles of internal friction of 30○ and 40○. The results are linearized to obtain bearing capacity factors Nγ and Nq and shape factors for a circular footing. The increase of the calculated bearing capacity with depth of burial is sufficiently large to indicate that the small footing settlement prior to failure is a significant factor in the large discrepancies between theoretical and experimentally observed bearing capacities.

Subject Headings: Load bearing capacity | Footings | Approximation methods | Cohesionless soils | Plastics | Equilibrium | Numerical methods

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