Effect of drainage and consolidation on the pore water pressures and total stresses within backfilled stopes and on barricades

Type de document

Études primaires

Année de publication

2019

Langue

Anglais

Titre de la revue

Advances in Civil Engineering

Résumé

The pore water pressures (PWPs) and total stresses during the placement of a slurried backfill in underground mine stopes are the key parameters for the design of barricades, built to retain the backfill in the stopes. They can be affected by the drainage and consolidation of the backfill. Over the years, several studies have been reported on the pressure and stresses in backfilled stopes by accounting for the drainage and consolidation. Most of them focused on the pressure and stresses in the stopes, few specifically on the barricades. The effect of the number of draining holes commonly installed through the barricade has never been studied. In this paper, the influence of hydraulic properties and filling rate of the backfill, stope size, barricade location, and number of draining holes is systematically investigated with numerical simulations. The results show that the stresses in the backfilled stope and on the barricade largely depend on the filling rate, hydraulic conductivity, and Young's modulus of the backfill. The draining holes can significantly decrease the PWP, but only slightly the total stresses on the barricades in short term. © 2019 El Mustapha Jaouhar and Li Li.

Mots-clés

Exploitation avec remblayage, Stowing and filling, Concentration de tensions, Stress concentration, Formation de voûtes, Arching

Numéro de projet IRSST

2013-0029

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