GEOMECHANICAL STUDY OF COAL SERIES MINING IN THE RUBAN MINE UNDER HYDRAULIC FILL OF OPEN PIT

Geological conditions of Blagodatnyi Gluboki site in the Ruban Mine and hydraulic fill formed during open pit mining of Krasnogorski II coal seam of the Mokhovo Open Pit Coal Mine division are analyzed in connection with scheduled mining of lower lying Polysaevski II, Nadbaikaim and Baikaim seams. In this case, the hydraulic fill is a water body, on the one hand, involving hazards associated with water and water-saturated rock breakouts in underground excavations and, on the other hand, is a water-saturated mass which may present an environmental threat in case of an accident. The scientific missions and engineering problems are formulated to ensure the underground mine safety and hydraulic fill stability on the undermined site. The results of the pilot longwall 812 mining of Polysaevski II coal seam with monitoring of deep-seated check point displacements and variation in water pressure in undermined rock mass, as well as with ground surface deformation surveillance are analyzed, and the actual height of water-conducting fracturing zone is determined.

The depths of safe mining are calculated for the Blagodatnyi Gluboki coal site under the hydraulic fill. It is concluded that water-conducting fractures in the undermined rock mass will not reach the water body if its boundary fits the hydraulic fill bed. The geomechanical design of shield-type structures for the hydraulic fill undermining shows that safety factor of dams will be higher than standard value in Polysaevski II and Nadbaikaim coal seams while it will drop below the standard in Baikaim seam mining. The structural stability of dam slopes will be provided by means of additional dumping.


For citation: Sablin M. V., Borger E. B., Kutepov Yu. I., Kutepov Yu. Yu., Mironov A. S. Geomechanical study of coal series mining in the Ruban Mine under hydraulic fill of open pit. MIAB. Mining Inf. Anal. Bull. 2019;(6):124-135. [In Russ]. DOI: 10.25018/0236-1493-2019-06-0-124-135.

Keywords

Rock mass movement, hydraulic fill, hydrodynamic accident, water body, undermining, water-conducting fracture zone, safe mining depth, dam stability.

Issue number: 6
Year: 2019
ISBN: 0236-1493
UDK: 622.841
DOI: 10.25018/0236-1493-2019-06-0-124-135
Authors: Sablin M. V., Borger E. B., Kutepov Yu. I., etc.

About authors: M.V. Sablin (1), Chief Engineer of Mine Administration named after Ruban e-mail: SablinMV@suek.ru, E.B. Borger (1), Chief Surveyor of Mine Administration named after Ruban, e-mail: BorgerEB@suek.ru, Yu.I. Kutepov (2), Dr. Sci. (Eng.), Professor, Head of Laboratory, e-mail: koutepovy@mail.ru, Yu.Yu. Kutepov (2), Graduate Student, Engineer, e-mail: KutepovYY@ya.ru, A.S. Mironov (2), Cand. Sci. (Geol. Mineral.), Leading Researcher, e-mail: mironov1940@mail.ru, 1) JSC «SUEK-Kuzbass», 652507, Leninsk-Kuznetsk, Kemerovo region, Russia, 2) Saint Petersburg Mining University, 199106, Saint-Petersburg, Russia. Corresponding author: Yu.Yu. Kutepov, e-mail: KutepovYY@ya.ru.

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