Strength reduction on saturation of coal and coal measures rocks with implications for coal pillar strength

Poulsen, B. A., Shen, B., Williams, D. J., Huddlestone-Holmes, C., Erarslan, N. and Qin, J. (2014) Strength reduction on saturation of coal and coal measures rocks with implications for coal pillar strength. International Journal of Rock Mechanics and Mining Sciences, 71 41-52. doi:10.1016/j.ijrmms.2014.06.012


Author Poulsen, B. A.
Shen, B.
Williams, D. J.
Huddlestone-Holmes, C.
Erarslan, N.
Qin, J.
Title Strength reduction on saturation of coal and coal measures rocks with implications for coal pillar strength
Journal name International Journal of Rock Mechanics and Mining Sciences   Check publisher's open access policy
ISSN 1365-1609
1873-4545
Publication date 2014-10
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.ijrmms.2014.06.012
Open Access Status
Volume 71
Start page 41
End page 52
Total pages 12
Place of publication Kidlington, Oxford United Kingdom
Publisher Pergamon Press
Collection year 2015
Language eng
Abstract Coal and associated coal measures rocks, including shales, mudstones and sandstones, may lose significant strength on water saturation due to the absorption of water, stress corrosion or mineralogical changes to the clays within the rock matrix. As most coal seams are natural aquifers, water ingress into underground mine workings is common, and is typically controlled during mining by dewatering pumps. After a mine has closed, unless ongoing pumping is maintained, workings will flood and coal pillars and the pillar roof and floor foundations will revert to fully saturated conditions. This paper reports on a study of how flooding effects pillar strength in an abandoned coal mine in Queensland, Australia. The reduction in strength of coal and coal measures rocks between unsaturated and saturated water moisture contents has been quantified through physical testing. These strength data, along with the distribution of lithologies in a coal pillar from the mine, were used as inputs for numerical modelling of the strength reduction of a coal pillar on water saturation. It was found that the modelled pillar strength reduction could be estimated by the average strength reduction of all the lithological components of the pillar, weighted by the thickness of each lithology.
Keyword Coal strength
Strength reduction
Water saturation
Coal pillar strength
Laboratory testing
Coal measure rocks
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2015 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 3 times in Thomson Reuters Web of Science Article | Citations
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