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01-12-2018 | Technical paper | Issue 1/2018

Innovative Infrastructure Solutions 1/2018

Assessment of failure mechanism of a strip footing on horizontal ground considering flow rules

Journal:
Innovative Infrastructure Solutions > Issue 1/2018
Authors:
Rana Acharyya, Arindam Dey

Abstract

Numerical investigation of the failure mechanism developed beneath a strip footing resting on non-dilatant cohesionless soil has been investigated in a finite element framework. The observed failure mechanism is manifested in terms of incremental displacement and incremental deviatoric strain patterns. A series of simulation on foundation models were carried out to examine the influence of various factors on the failure mechanism, namely meshing pattern, mesh refinement schemes, soil shear strength properties and embedment of the footing. The numerical outcomes have been verified against sophisticated laboratory investigations available in the literature. The developed failure mechanism is found to be asymmetric and markedly one-directional, the nature being prevalently independent to the variation in the influencing factors. Failure mechanism is found to progressively evolve following a mode-switching phenomenon, exhibiting transition from elastic to plastic deformations at- or near-failure. The deviations of the numerically obtained evolving failure mechanism from the same as pre-assumed in the conventional bearing capacity theories are explored and reported herein.

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