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Numerical modelling of rectangular footing on a sand embankment over mine tailings

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posted on 30.01.2020, 00:00 by Shah Neyamat Ullah, MS Hossain, Y Hu, A Fourie
3D finite element simulations are conducted to better understand the soil-structure interaction of rectangular foundations resting on a sand embankment over soft mine tailings. To account for large strains, an updated Lagrangian formulation is used in which the stiffness matrix is updated with the non-linear change of the soil geometry. The sand is modelled using a modified Mohr-Coulomb (MMC) soil model where the friction and dilation angles are varied with deviatoric plastic strains. It is shown that failure over a moderate slope angle of 22° and normalised sand embankment height (H/B) of 0.26 (H is the embankment height and B is the footing width) involves a deep seated circular slip plane, involving the sand and clay layers, where the foundation was close to the crest of the embankment. The failure pattern turns gradually to typical punch-through with an inclined sand shear plane as the distance of the footing edge exceeds 1.13B from the crest. The results of this study agree well with those from model centrifuge experiments, and can be utilised in developing better analytical models and equipment capable of live monitoring of slope deformation. © 2020, Springer Nature Singapore Pte Ltd.

History

Editor

Wang CM; Ho JCM; Kitipornchai S

Parent Title

ACMSM25: Proceedings of the 25th Australasian Conference on Mechanics of Structures and Materials

Volume

37

Start Page

1027

End Page

1036

Number of Pages

10

Publisher

Springer

Place of Publication

Singapore

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

University of Western Australia

Era Eligible

Yes

Number of Chapters

104

Exports