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Civil-Comp Proceedings
ISSN 1759-3433 CCP: 63
COMPUTING DEVELOPMENTS IN CIVIL AND STRUCTURAL ENGINEERING Edited by: B. Kumar and B.H.V. Topping
Paper VI.6
Advanced Numerical Modelling of Terzaghi's Superposition Theory for Embedded Granular Foundations P.K. Woodward
Department of Civil and Offshore Engineering, Heriot-Watt University, Edinburgh, Scotland P.K. Woodward, "Advanced Numerical Modelling of Terzaghi's Superposition Theory for Embedded Granular Foundations", in B. Kumar, B.H.V. Topping, (Editors), "Computing Developments in Civil and Structural Engineering", Civil-Comp Press, Edinburgh, UK, pp 211-218, 1999. doi:10.4203/ccp.63.6.6
Abstract
Traditionally the analysis of footings embedded in granular
soils has been one of the most difficult finite element
simulations to be attempted in geomechanics. This is
particularly noticeable by a general lack of published work in
foundation analysis using finite elements in the literature.
Because of the difficulties involved most of the work
performed in this area has concentrated on the use of simple
linear elastic perfectly plastic Mohr-Coulomb constitutive soil
models. This paper advances the state-of-the-art by describing
the use of a non-linear elastic multi-surface kinematic soil
model for the simulation of circular foundations embedded in a
particular granular soil. The paper first computes the bearing
capacity factors N_gamma and N_q separately, then checks Terzaghi's
superposition theory by simulating an embedded foundation
(modeled as a surface foundation with an initial surcharge). It
is well known that the bearing capacity factor N_gamma is a function
of the foundation width. The paper confirms this, and also
shows that the bearing capacity factor N_q is actually related to
the foundation depth.
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