## Abstract

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.

Original language | English |
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Title of host publication | ACMSM25 |

Subtitle of host publication | Proceedings of the 25th Australasian Conference on Mechanics of Structures and Materials |

Editors | Chien Ming Wang, Johnny C.M. Ho, Sritawat Kitipornchai |

Place of Publication | Germany |

Publisher | Springer Heidelberg |

Pages | 1027-1036 |

Number of pages | 10 |

ISBN (Electronic) | 9789811376030 |

ISBN (Print) | 9789811376023 |

DOIs | |

Publication status | Published - 4 Sep 2020 |

Event | 25th Australasian Conference on Mechanics of Structures and Materials - Brisbane, Australia Duration: 4 Dec 2018 → 7 Dec 2018 Conference number: ACMSM25 |

### Publication series

Name | Lecture Notes in Civil Engineering |
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Volume | 37 |

ISSN (Print) | 2366-2557 |

ISSN (Electronic) | 2366-2565 |

### Conference

Conference | 25th Australasian Conference on Mechanics of Structures and Materials |
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Country/Territory | Australia |

City | Brisbane |

Period | 4/12/18 → 7/12/18 |