Risk assessment of seismic impact on the roof and pillars stability in Estonian underground

Sergei Sabanov, Jyri Rivaldo Pastarus, Oleg Nikitin, Erik Väli

Research output: Contribution to journalArticlepeer-review


The processes of immediate roof exfoliation and pillars collapse is accompanied by significant subsidence of the ground surface. Ground surface subsidence causes soil erosion and flooding, swamp formation, agricultural damage, deforestation, changes in landscape, ground water level decreasing and the formation of unstable cavities. For the last four years a new blasting technology with great entry advance rates (EAR) has been introduced in an experimental mining block. By improved blasting technique the EAR reached 4 m; it is twice greater in comparison with usual technology, but emulsion explosive volume is twice higher and explosion occurs for 4.5 seconds (about 15 times longer than with the old technology). As a result of such greater advance rates, unsupported room lengths up to 5.5 m with decreasing stability of the immediate roof (IR) can be expected. In this paper the analysis of the IR stability using the deformation criteria for a new room-and-pillar mining technology with modern machinery at "Estonia" mine is presented. The analysis of the IR stability is based on the on-site underground testing by using benchmark stations and convergence measurements. The target of this study is to determine the impact of the vibration on the roof and pillars stability using the risk assessment method. Risk analysis on the basis of available earthquake data is also carried out.

Original languageEnglish
Pages (from-to)325-333
Number of pages9
JournalEstonian Journal of Engineering
Issue number4
Publication statusPublished - Dec 1 2008


  • Deformation
  • Immediate roof
  • Particle peak velocity
  • Risk analysis
  • Room-and-pillar mining
  • Stability

ASJC Scopus subject areas

  • Engineering(all)

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