Authors: Veenstra, RL; Grice, AG; Grabinsky, MW; Bawden, WF


DOI https://doi.org/10.36487/ACG_rep/1504_25_Veenstra

Cite As:
Veenstra, RL, Grice, AG, Grabinsky, MW & Bawden, WF 2015, 'Early curing age paste backfill exposures – the role of effective stress', in R Jewell & AB Fourie (eds), Proceedings of the 18th International Seminar on Paste and Thickened Tailings, Australian Centre for Geomechanics, Perth, pp. 329-340, https://doi.org/10.36487/ACG_rep/1504_25_Veenstra

Download citation as:   ris   bibtex   endnote   text   Zotero


Abstract:
This paper presents results from a numerical modelling exercise that looks at vertically exposing sub-28-day cemented paste backfill. The reason for this exercise is that underground mining operations would like to start exposing cemented paste backfill (CPB) earlier in order to increase production. However, these earlier exposures would mean that the pore water pressures in the stope may not have fully dissipated, hence entering an effective stress state versus a total stress state. The goal of this paper was to examine how effective stress impacts these early exposures. This was done by modelling the filling and the subsequent pore water dissipation within a stope. This modelled CPB was then vertically exposed, using both effective and total stress models, at various times ranging from immediately after filling to 28 days after filling. The results of these models were then compared in order to determine what difference there was between the overall outcome.

References:
Grabinsky, MW, Bawden, WF, Simon, D, & Thompson, B 2008, ‘In situ properties of cemented paste backfill in an Alimak stope’, Proceedings of the 61st Canadian Geotechnical Conference, Canadian Geotechnical Society, Edmonton.
Hasan, A, Suazo, G, Doherty, JP & Fourie, AB 2014, ‘In situ measurements of cemented paste backfill in an operation stope at Lanfranchi Mine’, in Y Potvin & AG Grice (eds), Proceedings of the 11th International Symposium on Mining with Backfill, Australian Centre for Geomechanics, Perth, pp. 327-336.
Itasca Consulting Group, Inc. 2014, ‘FLAC3D: Fast Lagrangian Analysis of Continua in 3 Dimensions’, version 5.10, Itasca Consulting Group, Inc., Minneapolis,
Mozaffaridana, M 2011, ‘Using thermal profiles of cemented paste backfill to predict strength’, Master’s thesis, University of Toronto.
Thompson, BD, Grabinsky, MW, Veenstra, RL & Bawden, WF 2011, ‘In situ pressures in cemented paste backfill – a review of fieldwork from three mines’, in RJ Jewell & AB Fourie (eds), Proceedings of the 14th International Seminar on Paste and Thickened Tailings, Australian Centre for Geomechanics, Perth, pp. 491-504.
Veenstra, RL 2013, ‘A design procedure for determining the in situ stresses of early age cemented paste backfill’, PhD thesis, University of Toronto.




© Copyright 2020, Australian Centre for Geomechanics (ACG), The University of Western Australia. All rights reserved.
Please direct any queries or error reports to repository-acg@uwa.edu.au