A numerical analysis of how permeability affects the development of pore water pressure in early age cemented paste backfill in a backfilled stope

Authors: Veenstra, RL; Grabinsky, MW; Bawden, WF; Thompson, BD

DOI https://doi.org/10.36487/ACG_rep/1404_05_Veenstra

Cite As:
Veenstra, RL, Grabinsky, MW, Bawden, WF & Thompson, BD 2014, 'A numerical analysis of how permeability affects the development of pore water pressure in early age cemented paste backfill in a backfilled stope', in Y Potvin & T Grice (eds), Mine Fill 2014: Proceedings of the Eleventh International Symposium on Mining with Backfill, Australian Centre for Geomechanics, Perth, pp. 83-95, https://doi.org/10.36487/ACG_rep/1404_05_Veenstra

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Abstract:
This paper examines the behaviour of cemented paste backfill in the top part of the paste column. The paste within this section tends to exhibit isotropic behaviour and behaves more like a fluid than a solid. This trend will be examined using in situ instrumentation data obtained from test stopes. This behaviour in this isotropic zone tends to be determined by consolidation properties as opposed to strength properties. In order to examine this behaviour three models were run. Two using a fixed permeability curve and the third using a function that determines the consolidation parameters as a function of curing age and applied stress. A comparison of these results will help determine how the paste is behaving at these early curing ages.

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