Development of Seismic Activity Zones in Undermined Rock Mass in Hybrid Opencast/Underground Mining in Kirovsk Mine

The seismic activity in undermined rock mass in a mine at the Khibiny Massif is analyzed over the period from 2008 to 2020. The influences on deformation, tensile fracturing and caving in undermined rock mass are revealed. Three zones of deformation of different nature and velocity are identified in...

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Bibliographic Details
Published in:Journal of mining science 2022-12, Vol.58 (6), p.966-972
Main Authors: Semenova, I. E., Zhukova, S. A., Zhuravleva, O. G.
Format: Article
Language:English
Subjects:
Buttresses
Deformation
Earth and Environmental Science
Earth Sciences
Earthquakes
Fronts
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Massifs
Mineral industry
Mineral Resources
Mining
Mining industry
Open pit mining
Rock
Rock Failure
Rock masses
Rocks
Seismic activity
Underground mines
Underground mining
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Summary:The seismic activity in undermined rock mass in a mine at the Khibiny Massif is analyzed over the period from 2008 to 2020. The influences on deformation, tensile fracturing and caving in undermined rock mass are revealed. Three zones of deformation of different nature and velocity are identified in undermined rock mass in Kirovsk Mine: the zone at the juncture of underground and opencast mining; the zone of overhanging rocks; the zone of two- and three-side buttress at the edges of operating deposits. It is found that mining with head-on fronts, with formation of a support pillar and with overhanging of an uncaved rock mass beam is adverse. The pillar collapses later on and deformation of the pillar-supported rock mass during breaking of the butt section on sublevels occurs in the dynamic mode with high seismic activity both in terms of the number of seismic events and their energy emission. It is found that the width of the seismic activity band and the caving pitch of the overhang depend on the height of undermined rock mass.
ISSN:1062-7391
1573-8736
DOI:10.1134/S1062739122060114