MINING BLOCK STABILITY ANALYSIS IN ESTONIAN OIL SHALE MINES BY STATISTICAL METHODS

J. R.Pastarus, T. Tomberg

Abstract


This paper analysis the stability o f the mining blocks in Estonian oil shale mines, where the room-and-pillar mining system is used. The pillars are arranged in a singular grid. The processes in overburden rocks and pillars have caused the subsidence of the ground surface. Statistical analysis o f the pillars cross-sectional area evaluated the calculations. Normal distribution control allows determing the stability of a mining block. By normal distribution of the pillars cross-section area a potential collapse of a mining block can be expected. Theoretical and in situ investigations in Estonian oil shale mines showed that their results are close to the modeling ones. The surface subsidence parameters will be determined by conventional calculation schemes. Presented method suits well for mining block stability analysis and spontaneous failure prognosis.

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References


Pastarus, J.-R., Toomik, A. Subsidence prediction in Estonia’s oil shale mines. Proc. of the sixth International Conference SWEMP 2000 Environmental issues and management of waste in energy and mineral production. Galgari/Alberta/Canada, May30-June 2, 2000, A.A.Balkema/Rotterdam/Brookfield, 2000, p. 225-229

Talve, L. Check-up of real parameters of room-and-pillar mining in Estonia's oil shale mines. Ibid., No.451, 1978, p 23-35 [in Russian]

Bevington, P.R., Robinson D.K. Data reduction and error analysis for the physical sciences. McGraw-Hill, Inc., New York, 1992. P.328

Weimer, R.C. Statistics. 2nd ed. Belmont, CA:Wm.C.Brown Publishers, 1993, p.213.

Borissov,A. Mechanics of Rock and Rock Masses. Nedra, Moscow, 1980, p360 [in Russian]

Parker,! Mine pillar design in 1993: Computers have become the opiate of the mining engineers Mining Engineering. July and August, 1993, p 714-717 and 1047-1050. (London)

Stetsenko, V., Ivanov, G. Prognosis of the time-depending roof displacements for different span lengths. Oil-Shale, No.ll, 1981, p 13-18 (EstNIINTI) [inRussian]

Toomik,A., Undusk,V. Determination of the surface subsidence parameters for room-and-pillar mining. Oil

Shale , No.6, 1983, p. 7-11 (in Russian)




DOI: http://dx.doi.org/10.17770/etr2001vol1.1931

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