Abstract
In underground coal mining any increase in coal recovery rate is dependent on a decrease in pillar size. Backfilling is one way of reducing the required size of pillars and hence the volume of coal left underground. Therefore any comparisons made between a self-supported mine layout and backfill supported mine layout are based directly on pillar design. The most effective way to examine the effect of backfill on pillar support, and subsequently the rate of recovery, would be to incorporate the mechanisms of backfill support directly into the current design procedure for coal pillars. This paper presents a review of the mechanics of backfill support, a method of estimating the magnitude of that support based on earth pressure theory, and an example that incorporates backfill support into current coal pillar design.
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References
Aithchison, G.D., Kurzeme, M.and Willoughby, D.R.(1973)Geomechanic considerations in optimizing the use of ll,In:Mine Filling-Proceedings of the Jubilee Symposium, Australian Institute of Mining and Metallurgy,Queensland,Australia,pp.25-48.
Barker, R.M., Duncan, J.M., Rojiani, K.B., Ooi,P., Tan, C.K.and Kim, S.G.(1991) Engineering manual for retaining walls and abutments-manuals for the design of bridge foundations,National Cooperative Highway Research Program Report 343,53-110.
Barret, J.R., Coulthard, M.A.and Dight, P.M.(1978)Determination of ll stability,In: Mining with Back ll-12th Canadian Rock Mechanics Symposium, Canadian Institute of Mining and Metallurgy,Quebec,Special Vol.19,pp.85-91.
Basu,K.(1997)Feasibility of and integrated thin seam coal mining and waste disposal system, Thesis,Virginia Tech,Blacksburg,VA,92.
Bieniawski, Z.T.and van Heerden, W.L.(1975)The signi cance of in-situ tests on large rock specimens,International Journal of Rock Mechanics and Mining Science, 12, 101-113.
Blight, G.E.and Clarke, I.E.(1983)Design and properties of stiff ll for lateral support of pillars,In:Proceedings of International Symposium on Mining with Back ll, A.A.Balkema, Rotterdam,pp.303-307.
Brady, B.H.and Brown, E.T.(1992)Rock Mechanics for Underground Mining, Chapman and Hall, New York,pp.571.
Cai,S.(1983)A simple and convenient method for design of strength of cemented hydraulic ll,In:Proceedings of International Symposium on Mining with Back ll, A.A.Balkema, Rotterdam,pp.405-412.
Caquot, A.and Kersiel J.(1948)Tables for the Calculation of Passive Pressure,Active Pressure,and Bearing Capacity of Foundations, Translated by Maurice Bec,Gauthier-Villars,Paris,p.120.
Clark, I.H.and Boyd, G.L.(1998)The potential for back ll in highwall mining,summary of progress for Australian Coal Association Research Project C6014:Highwall Mining Back ll.
Clough, G.W.and Duncan, J.M.(1971)Finite element analyses of retaining wall behavior, Journal of Soil Mechanics and Foundations Division, ASCE,97, 1657-1673.
Coates, D.F.(1981)Caving,subsidence,and ground control,In:Rock Mechanics Principles, Minister of Supply and Services Canada,Chapter 5.
Donovan,J.(1997)The effects of back lling on ground control and recovery in thin-seam coal mining,Thesis,Virginia tech,Blacksburg,VA,148.
Donovan, J.and Karfakis, M.G.(2001)The effects of back lling on ground control and recovery in thin-seam coal mining,In:Proceedings of MINEFILL 2001, SME,Seattle.
Farmer, I.W.(1985)Coal Mine Structures, Chapman and Hall, New York,310.
Guang-Xu, T.and Mao-Yuan, H.(1983)Assessment on support ability of the ll mass, In:Proceedings of International Symposium on Mining with Back ll, A.A.Balkema, Rotterdam,pp.433-442.
Hume, R.G.and Searle, G.K.(1998)Improved recovery in highwall mining using back ll, Australian Coal Association Research Project,no.C3502.
Jeremic, M.L.(1985)Strata Mechanics in Coal Mining, A.A.Balkema, Rotterdam,p.566.
Mark, C.and Chase, F.E.(1997)Analysis of retreat mining pillar stability,In:Proceedings: New Technology for Ground Control in Retreat Mining, NIOSH Information Circular, No.9446,pp.17-34.
Salamon, M.D.G.and Oravecz, K.L.(1976)Rock Mechanics in Coal Mining, Chamber of Mines of South Africa,PRD Series,198,pp.59-65.
Swan, G.and Board,M.(1989)Fill-induced post-peak pillar stability,In:Proceedings of the 4th International Symposium on Mining with Back ll-Innovations in Mining Back ll Technology, A.A.Balkema, Rotterdam,pp.80-87.
Terzaghi,K., Peck, R.B.and Mesri,G.(1996)Soil Mechanics in Engineering Practice, Wiley and Sons, New York,pp.549.
Thomas, E.G.(1979)Fill Technology in Underground Metalliferous Mines, International Academic Services Ltd.,Kingston,Ontario,293.
Wagner,H.(1974)Determination of the complete load-deformation characteristics of coal pillars,In:Proceedings of the 3rd International Congress on Rock Mechanics, ISRM, Denver,pp.1076-1082.
Yamaguchi, U.and Yamatomi,J.(1989)An experimental study to investigate the effect of back ll for ground stability,In:Proceedings of the 4th International Symposium on Mining with Back ll-Innovations in Mining Back ll Technology, A.A.Balkema, Rotterdam, pp.71-80.
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Donovan, J.G., Karfakis, M.G. Design of backfilled thin-seam coal pillars using earth pressure theory. Geotechnical and Geological Engineering 22, 627–642 (2004). https://doi.org/10.1023/B:GEGE.0000047047.65476.c6
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DOI: https://doi.org/10.1023/B:GEGE.0000047047.65476.c6