A 3D analytical solution for the short-term stress distribution in backfilled stopes and on barricades

Pengyu Yang, Li Li

In the proceedings of: GeoRegina 2014: 67th Canadian Geotechnical Conference

Session: Mining Geotechnics

ABSTRACT: Cemented paste backfill (CPB) is used to increase ground stability and ore recovery by underground mines worldwide. A key issue associated with application of CPB is to estimate the stresses in the backfilled stopes and on barricades. Recent numerical and experimental results showed that the critical moment for the safety of barricade is shortly after the placement of a CPB that still behaves like a fluid possessing a certain yield shear stress. This yield shear stress induced arching effect has never been considered in pressure estimation in backfilled openings. In this paper, a CPB shortly poured in a stope and barricade drift is treated as a Bingham fluid. A three dimensional analytical solution is proposed to evaluate the short-term stresses in backfilled stopes and on barricades. Sample calculations reveal that the yield shear stress induced arching effect is positively related with the backfill yield shear stress, fill height and barricade position, and negatively related with the cross sectional areas of the stope and drift.

RÉSUMÉ: Le remblai en pâte cimenté (RPdu terrain et augmenter le taux de récupération de minerai. Un aspect essentiel pour une utilisation sécuritaire du RPC dans un chantier remblayé et sur les barricades. Les résultats numériques et expérimentaux récents ont montré que du RPC lorsqu se comporte encore comme un fluide possédant un certain . . Dans cet article, le RPC peu après son versement dans un chantier est traité comme un fluide de Bingham. Une solution analytique tridimensionnelle est proposée pour évaluer les contraintes à court terme dans un chantier remblayé et sur les barricades est positivement lié au du remblai, à la hauteur du remblai et à la position de la barricade. Cependant il est inversement lié à l-section du chantier et des galeries.

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