Experience in refining the critical depth of rock burst hazard at the ore deposit during transition to underground mining
About authors
- 1 — Ph.D. Deputy General Director Geotechnical Bureau LLC ▪ Orcid
- 2 — Ph.D. Associate Professor Empress Catherine II Saint Petersburg Mining University ▪ Orcid
- 3 — Ph.D. Chief Specialist Geotechnical Bureau LLC ▪ Orcid
- 4 — Ph.D. Associate Professor Empress Catherine II Saint Petersburg Mining University ▪ Orcid
Abstract
The paper considers the problem of refining the critical depth of rock burst hazard for the Nyorkpakhk apatite-nepheline ore deposit in the context of transition to underground mining. The relevance of the study results from the discrepancy between the value of 400 m (according to regulatory documentation) and the actual mining and geological conditions, especially considering the significant impact of the existing open pit on the stress-strain state of the rock mass and other natural factors of the region. The aim of the study is the development and testing of a comprehensive methodology for assessing the critical depth of rock burst hazard, including core discing analysis, seismicity monitoring, spatial numerical modeling of the stress-strain state using the CAE Simulia Abaqus software, assessment of the rock burst hazard potential of rocks based on the Kaiser criterion, and comparison with a geomechanically similar analogue Oleniy Ruchey deposit. Core discing analysis revealed only local stress zones associated with tectonic faults, without characteristics pointing to rock burst hazard down to the +100 m level. The results of numerical modeling confirmed the absence of stress concentrations down to the +35 m level both before the start and after the completion of open pit mining. Comparison using the similarity method showed expected manifestation of rock burst hazard below the +50 m level. The studies, according to the described methodology, enabled scientific justification of increasing the critical depth of rock burst hazard relative to the regulatory value, down to the +100 m level. It has also been determined that for the Khibiny deposits there is no direct correlation between the brittleness criterion and the propensity for rock burst hazard. The proposed methodology is recommended for testing at rock burst hazardous deposits with complex mining and geological conditions.
Область исследования:
Geotechnical Engineering and Engineering Geology
Keywords:
stress-strain state
rock burst hazard depth
rock pressure manifestations
core discing
numerical modeling
Kaiser criterion
rock brittleness
Funding:
None
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