A Numerical Modelling Based Parametric Study on the Bearing Capacity of Shallow Foundations on Cohesionless Soils Underlain by a Shallow Rigid Layer


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BABAGİRAY G. , AKBAŞ S. O.

TEKNIK DERGI, vol.29, no.1, pp.8185-8198, 2018 (Journal Indexed in SCI) identifier

  • Publication Type: Article / Article
  • Volume: 29 Issue: 1
  • Publication Date: 2018
  • Doi Number: 10.18400/tekderg.345394
  • Title of Journal : TEKNIK DERGI
  • Page Numbers: pp.8185-8198

Abstract

A finite element-based parametric study was conducted to examine the effect of shallow rigid layer on the bearing capacity of shallow foundations in cohesionless soils considering footing width, shape, rigid layer depth, and the effective stress friction angle of the soil. The results of full-scale load tests on footings with widths that range between 1 m and 3 m conducted in the National Instrumentation Site at Texas A&M University were used to calibrate the finite element models. The factors that influence the critical depth at which the rigid layer has no more influence on the bearing capacity of square/circular and strip footings were investigated for a series of drained friction angles (32 degrees, 35 degrees, 40 degrees, 45 degrees) and footing widths (B=1m, 1.5m, 2.5m, 3m). As expected, results indicate a diminishing rigid layer effect with increasing depth, but more importantly, the influences of drained friction angle, footing width and shape that have not been previously examined in detail, were revealed and presented in the form of design charts.