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A Solution to Estimate Stresses in Backfilled Stopes by Considering Self-weight Consolidation and Arching

  • Jian ZhengEmail author
  • Li Li
Conference paper
Part of the Environmental Science and Engineering book series (ESE)

Abstract

Mine backfilling is an environment friendly solution. It has become a common practice in many underground mines around the world. Despite numerous advantages associated with this practice, efforts are needed to adequately design a retaining structure, called barricade to hold the backfill slurry in the stopes. This requires a good knowledge of the backfill pressures on the barricades. When a slurried backfill is poured in the stope, self-weight consolidation takes place with a quick generation and a slow dissipation of excess pore water pressure (PWP). When the dissipation of excess PWP advances sufficiently, effective stresses can develop in the backfill and shear stresses generate along fill-wall contacts. The shear stresses along the fill-wall contacts tend to reduce the stresses in the backfill and known as arching effect. Until now, the pressure estimation in backfilled stopes has been done mostly by considering only one of the two processes. In this paper, a solution is presented to evaluate the stresses in backfilled stopes by taking into account the self-weight consolidation and arching effect. The proposed solution is validated against numerical modeling performed with PLAXIS2D.

Keywords

Mine backfilling Barricade Backfill pressure Self-weight consolidation Arching effect 

Notes

Acknowledgements

The authors would like to acknowledge the financial support from the Natural Sciences and Engineering Research Council of Canada (NSERC 402318), Institut de recherche Robert- Sauvé en santé et en sécurité du travail (IRSST 2013-0029), Fonds de recherche du Québec—Nature et Technologies (FRQNT 2015-MI- 191676), and industrial partners of the Research Institute on Mines and the Environment (RIME UQAT-Polytechnique; http://rime-irme.ca/).

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Research Institute of Mining and Environment (RIME UQAT-Polytechnique), Department of Civil, Geological and Mining EngineeringÉcole Polytechnique de MontréalMontréalCanada

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