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IMPROVED UNDERGROUND MINING DESIGN METHOD FOR ESTONIAN OIL SHALE DEPOSIT

Jyri-Rivaldo Pastarus

Abstract


The paper deals with the improved mining design method for Estonian oil shale mines, where the room-and-pillar mining system is used. Design of mining block parameters is based on the instruction used in Estonian oil shale mines. The factor of safety is very large. Consequently, the design method does not take into consideration all the influence factors. It is determined the supplementary influence factors and given the mathematical formulas. In this case the factor of safety is reduced up to 1.2. The improved mining design method is of particular interest for practical purposes.


Keywords


depth of excavation; design; factor of safety; fracture process; influence factor; influence zone; mining block; pillar cross-section area; room-and-pillar mining; stability

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References


Mining-law and legal regulation acts. Ministry of Environment, Ministry of Economy. Part II. Tallinn, 1988 (in Estonian).

Nikitin, O. Optimization of the Room-And-Pillar Mining Technology for Oil-shale Mines. Doctoral theses. Tallinn, TTU, 2003 .

Pastarus, J.-R. Improved method of predicting long-term stability of the mining blocks in Estonian oil shale mines. Proc. of the International Conference “Scientific achievements for wellbeing and development of society. Enabling environment for society wellbeing”. (Noviks, G. ed.). Rezekne Augstskolas Izdevnieciba, Rezekne, Latvia,March 4-5, 2004, p.37-42.

Pastarus, J.-R., Toomik, A. Roof and pillar stability prognosis in Estonian oil shale mines. Rock Mechanics. Proc. of the ISRM regional Symposium EUROCK 2001 “Rock Mechanics a shallenge for society”. Espoo, Fin land, 4-7 June 2001, A. A. Balkema/Lisse/Abingdon/Exton (PA)/Tokyo, 2001, p.849-853.

Pastarus, Yu.-R. V., Nikitin, O.V. Estimation methods for stability of mining excavations (on the example of shailoil deposit in Estonia). Gornyj Zhurnal. Ruda I Metally, Moscow, 4-5. 2003, p.71-75. (in Russian).

Pastarus, J.-R. Fracture process in pillars. Proc. of the International Conference on Structural Integrity and Fracture (SIF 2002). Perth, Australia, 25-27 September 2002, p.343-346.




DOI: https://doi.org/10.17770/etr2005vol1.2140

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