Determination of parameters of the underground inclined coal seam mining in Quang Ninh basin under protected objects on the surface
- Institute of Mining Science and Technology – Vinacomin
Abstract
Based on analysis of mining and geological conditions of natural occurrence of coal seams at Quang Ninh basin it has been determined that more than 37 % of deposit reserves are located under the protected surface objects. To justify the possible variants of technological schemes for development of these coal seams situated under protected surface objects there has been a methodology for evaluation of displacement parameters of undermined layer during underground mining operations. The article shows the possibility to perform calculations for this methodology that originally were developed for coal deposits in Russia and to use calculated coefficients for Bulanashskoe deposit (Ural), because its mining and geological conditions of natural occurrence for coal seams are similar to the conditions of occurrence at Quang Ninh basin. It also presents the research results for possibility to apply the development systems to mine the reserves located under protected surface objects using the technological schemes with roof control, with complete caving, full backfilling and pillar roof support. It has been identified that with a system of roof support using complete caving the deformation of surface exceed the critical values required for preservation of surface objects. In case of using the development technology with full backfilling there have been defined a minimal admissible coefficient of backfilling, as well as requirements to filling materials. For coal deposit mining technology using the method of pillar roof support there have been defined parameters for pillars and chambers, identified maximum admissible extraction ratio ensuring protection and safety of objects located on the surface. It also presents the algorithm for selection of technological mining scheme for development of coal seams of Quang Ninh basin.
References
- Avershin S.G. Calculation of deformations of the rock massif under the influence of underground mining. Leningrad: VNIMI, 1960, p. 87 (in Russian).
- Borisov A.A. Mechanics of rocks and massifs. Мoscow: Nedra, 1980, р. 360 (in Russian).
- Grebenkina S.S., Mel'nik V.V. Advanced technologies of underground mining of deposits with backfilling of mined out spaces. Donetsk: «VIK», 2013, р. 749 (in Russian).
- Gusev V.N., Volokhov E.M. Displacement and deformation of rocks. Sankt-Peterburgskii gosudarstvennyi gornyi institut (tekhnicheskii universitet). Second edition, St. Petersburg, 2008, р. 83 (in Russian).
- Kazanin O.I., Mustafin M.G., Le Van Khau. Selection of development technology for seams at Nam mau mine (Vietnam) providing safety of undermined objects. Promyshlennaya bezopasnost' predpriyatii mineral'no-syr'evogo kompleksa v XXI veke. Gornyi informatsionno-analiticheskii byulleten'. 2015. Otdel'nyi vypusk N 7, p. 545-554 (in Russian).
- Kazanin O.I., Le Van Khau. State and prospects for development of underground coal mining technology in Quang Ninh basin in Vietnam. Gornyi informatsionno-analiticheskii byulleten'. 2014. N 5, p. 15-20 (in Russian).
- Makinali P. How to make Russian mines economically efficient. Ugol'. 1999. N 9, p. 46-50 (in Russian).
- Mel'nik V.V., Khrisanov P.E. Usage of mine rocks and coal processing waste as backfilling material for underground coal mining. Gornyi informatsionno-analiticheskii byulleten'. 2010. N 5, р. 282-287 (in Russian).
- Methodical instructions on the forecast of displacement and deformations of the earth's surface and determination of loads on buildings with multiple undermine operations. Leningrad: VNIMI, 1987, p. 94 (in Russian).
- Methodological guidelines for the selection of geomechanical parameters of the technology of coal seams development by short longwall faces. M-vo energetiki RF. RAN. FGUP «Gos. NII gorn. geomekh. i marksheid. dela – NTs VNIMI». St. Petersburg, 2003, p. 89 (in Russian).
- Mustafin M.G., Naumov A.S. Control of admissible deformations of earth’s surface during construction of vertical work-ings under conditions of built-up areas. Zapiski Gornogo instituta. 2012. Vol. 198, p. 194-197 (in Russian).
- Pevzner M.E., Iofis M.A., Popov V.N. Geomechanics. Мoscow: Gornaya kniga, 2008, p. 438 (in Russian).
- Safety rules for structures and natural objects protection from influence of underground mining operations at coal deposits. St. Petersburg: VNIMI, 1998, р. 291 (in Russian).
- Klishin V.I., Zvorykin L.V., Lebedev A.V., Savchenko A.V. Safety issues and new technologies in underground mining of coal deposits. Novosibirsk: Novosibirskii pisatel', 2011, p. 524 (in Russian).
- Puchkov L.A., Zhezhelevskii Yu.A. Underground mining of mineral deposits: In 2 vol. Мoscow: Izd-vo MGGU, 2009. Vol. 1, p. 561 (in Russian).
- Borshch-Komponiets V.I., Batugina I.M., Varlashkin V.M., Kapralov V.K. Displacement of rocks and land surface during underground mining operations. Мoscow: Nedra, 1984, p. 245 (in Russian).
- Zaidenvarg V.E., Sobolev V.V., Snytkin I.I. et al. Technological schemes of seams development at coal mines. Ed. by V.E.Zaidenvarga. IGD im. A.A.Skochinskogo. Lyubertsy, 1991. Part 1, p. 206; Part 2, p. 415 (in Russian).
- Brady B.H.G., Brown E.T. Rock Mechanics for Underground mining: Third edition. Kluwer academic Publishers, Dor-recht – Boston – London. 2004, p. 628.
- Palarski J. Multi-slice Longwalling with backfill. 2th International underground Coal Conference – Underground Coal Mining Global Experience – Lessons for Survival, The Australian Coal Industry Research Laboratories (ACIRL) and the University of New South Wales, Sydney, 1999, p. 37-46.
- Peng S.S. Coal Mine Ground Control. West Virginia University. 2008, p. 750.