A laboratory study of backfilling bord and pillar voids using fly ash slurry

Authors: Williams, DJ; Ramlackhan, M; Spriggs, D; Alehossein, H; Shen, B

DOI https://doi.org/10.36487/ACG_rep/1104_46_Williams

Cite As:
Williams, DJ, Ramlackhan, M, Spriggs, D, Alehossein, H & Shen, B 2011, 'A laboratory study of backfilling bord and pillar voids using fly ash slurry', in R Jewell & AB Fourie (eds), Paste 2011: Proceedings of the 14th International Seminar on Paste and Thickened Tailings, Australian Centre for Geomechanics, Perth, pp. 537-550, https://doi.org/10.36487/ACG_rep/1104_46_Williams

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Abstract:
In various locations worldwide, fly ash slurry has been injected into underground bord and pillar coal mine workings to provide support, and the method was recently used successfully for the Ipswich Motorway upgrade in southeast Queensland, Australia. This paper describes laboratory testing, and the results obtained, aimed at achieving an improved understanding of the backfilling processes and to provide guidance for the effective application of fly ash slurry injection to stabilise bord and pillar underground coal workings and allow the safe development of the surface.

References:
ACARP Project C7033 (2001) Utilising Fly Ash Paste Backfill.
AS 1289, Methods of Testing Soils for Engineering Purposes, Standards Australia.
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Wald, S. and Beechie, B. (1996) Fly ash grout testing in a simulated wet mine environment, in Proceedings 18th Annual Conference of the Association of Abandoned Mine Lands, Kalispell, Montana, September 15–18, 1996.
Ward, C.R., French, D., Jankowski, J., Riley, K. and Li, Z. (2006) Use of coal ash in mine backfill and related applications, Research Report 62, CRC for Coal in Sustainable Development, Queensland Centre for Advanced Technologies.




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