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Minerals 2019, 9(1), 38; https://doi.org/10.3390/min9010038

Total and Effective Stresses in Backfilled Stopes during the Fill Placement on a Pervious Base for Barricade Design

1,*
,
1
and
2
1
Research Institute on Mines and Environment (RIME UQAT-Polytechnique), Department of Civil, Geological and Mining Engineering, École Polytechnique de Montréal, C.P. 6079, Succursale Centre-Ville, Montréal, QC H3C 3A7, Canada
2
MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China
*
Author to whom correspondence should be addressed.
Received: 10 November 2018 / Revised: 30 December 2018 / Accepted: 7 January 2019 / Published: 11 January 2019
(This article belongs to the Special Issue Backfilling Materials for Underground Mining)
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Abstract

Backfill is increasingly used in underground mines worldwide. Its successful application depends on the stability of the barricades built at the base of the stopes to hold the backfill in place, which in turn depends on the knowledge of the pore water pressure (PWP) and stresses during, or shortly after, the placement of the slurried backfill. Until now, self-weight consolidation is usually considered for the estimation of the PWP. There is no solution available to evaluate the total and effective stresses during, and shortly after, the filling operation. As excess PWP can simultaneously be generated (increased) and dissipated (decreased) during the backfilling operation, effective stresses can develop when the filling rate is low and/or hydraulic conductivity of the backfill is high. The arching effect has to be considered to evaluate the effective and total stresses in the backfilled stopes. In this paper, a pseudo-analytical solution is proposed to evaluate the effective and total stresses in backfilled stopes during the backfill deposition on a permeable base, by considering the self-weight consolidation and arching effect. The proposed solution is validated by numerical results obtained by Plaxis2D. A few sample applications of the proposed solution are shown. View Full-Text
Keywords: backfill; self-weight consolidation; arching effect; effective stress; total stress; excess pore water pressure (PWP); pervious base backfill; self-weight consolidation; arching effect; effective stress; total stress; excess pore water pressure (PWP); pervious base
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Zheng, J.; Li, L.; Li, Y. Total and Effective Stresses in Backfilled Stopes during the Fill Placement on a Pervious Base for Barricade Design. Minerals 2019, 9, 38.

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