Analysis of Large Displacements of an Aggregate Stockpile

M. Kanungo

In the proceedings of: GeoVancouver 2016: 69th Canadian Geotechnical Conference

Session: CASE HISTORIES - III Miscellaneous

ABSTRACT: Potential foundation failure of cone and triangular prism-shaped aggregate stockpiles into an adjacent river was investigated through back-analysis of a previous large foundation displacement event. Ground conditions included fill, thin silty sand layers and an extensive silty clay deposit. Borehole and piezocone investigations, pre- and post-displacement bathymetric river surveys, and limit equilibrium slope stability analyses were used to assess displacement mechanisms. A simplified method of accounting for three-dimensional effects within two-dimensional slope stability analysis methods was devised. Parametric analyses with and without 3-D effects subsequently informed operational guidelines for new stockpiles. During a busy construction season, stockpile height limitations were exceeded and large displacements occurred. Rapid site responses including removal of large stockpile volumes avoided full failure into the watercourse.

RÉSUMÉ: incluaient du remblai, du et post--alyser la rupture. Une méthode simplifiée bidimensionnelles. Des analyses paramétriques avec et sans effets tridimensionnels ont ensuite influencé les lignes directu.

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