Extraction of Ore Reserves from Safety Pillars in Rockburst-Hazardous Conditions of Tashtagol and Sheregesh Deposits
V. N. Filippov1, A. A. Eremenko1,2, E. A. Khristolyubov3
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630091 Russia
2Gorbachev Kuzbass State Technical University, Kemerovo, 650000 Russia
3EVRAZ ZSMK's, Sheregesh, Kemerovo Region 652971 Russia
Keywords: Rock burst, stress concentration, extraction block, cushioning volume, roof, safety pillar, backfill, rocks, level, mining system
Abstract
In deeper level mining in Tashtagol deposit, during extraction of ore reserves from safety pillar, the stresses and inelastic strain zones increase 2-4 times. In safety pillar in Sheregesh deposit, the tensile stress zones, where failure of undermined rocks intensifies, enlarge as mined-out stoping void grows. During mining in the Eastern and Northwestern sites of Tashtagol deposit, at the tunneling speed of 2.0-2.5 m/day and more, rock bumps of energy class 5-6 are recorded. In mining of Podruslovy and New Sheregesh sites, the decrease in the energy class of rock bumps is achieved at the tunneling rate of 0.4-0.6 m/day. The feasibility and sequence of safe extraction of ore reserves from safety pillars established under the Kondoma and Bolshaya Rechka rivers are justified. The backfill options in extraction of ore reserves from safety pillars in Tashtagol and Sheregesh deposits are discussed.
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