LONG-TERM STABILITY MONITORING OF THE MINING BLOCKS IN ESTONIAN OIL SHALE MINES
DOI:
https://doi.org/10.17770/etr2003vol1.2008Keywords:
larg-term stability, monitoring methods mining blocksAbstract
This paper deals with long-term stability prediction and monitoring methods by room-and-pillar mining system. Roof-to-floor convergence and conditional thickness methods suit for calculations. They allow determination of the location, area and time of the collapse in a mining block. The uncertainty in time is less than 10 % at the 95 % confidence level. Roof-to-floor convergence method is preferred; it takes into consideration all the geological and mining feature in the critical area. Conditional thickness method demands supplementary investigations, determination of the influence factors on the process. The applicability of these methods is clearly demonstrated.Downloads
References
Pastarus, J.-R., Nikitin, O. Mining block stability estimation in Estonian oil shale mines. Proc. of the International Symposium on Geotechnical Issues of Underground Space Use for Environmentally Protected World. Dnipropetrovsk, Ukraine, 26-29 June 2001, NMUU/Dnipropetrivsk, 2001, p.121-125.
Pastarus, J.-R., Tomberg,T. Mining block stability analysis in Estonian oil shale mines by statistical methods. . Proc. of the 3nd International Conference "Environment. Technology. Resources." Rezekne, Latvia, June 19-21, 2001, p.132-137.
Pastarus, J.-R., Toomik,A. Roof and pillar stability prognosis in Estonian oil shale mines. Rock Mechanics. Proc. of the ISRM Regianal Symposium EUROCK 2001 “Rock Mechanics a shallenge for society”. Espoo, Finland, 4-7 June 2001, A.A.Balkema/Lisse/Abingdon/Exton (PA)/Tokyo, 2001, p.849-853.
Ranalli, G. Rheology of the Earth. Chapman & Hall. London/Glasgow/New York, Tokyo/ Madras. 1995, 413 p.
Erganov, G.S., Saginov, A.S., Gumenyuk, G.N., Veksler, Y.A., Nesterov, G.A. Creep of the sedimentary rocks. Nauka. Alma-Ata, 1970, 208 p. (in Russian)
Bulychov, N. Mechanics of underground constructions. Nedra. Moscow. 1989. (in Russian)
Rosenbeg, V.M. Creep of metals. Metallurgia. Moskow. 1967, 157 p. (in Russian)
Parker, I. 1993. Mine pillar design in 1993: Computers have become the opiate of the mining engineers. Mining Engineering, London, July and August 1993: 714-717 and 1047-1050.
