ANALYSIS OF THE ROOF AND PILLAR DESIGN IN ESTONIA'S OIL SHALE MINES
J.-R. PASTARUS
Tallinn Technical University,
Department of Mining
82 Kopli St., Tallinn
EE0004 Estonia
| This paper analyses the pillar and roof design in Estonia's
oil shale mines, where the roof-and-pillar mining is used. Numerical modeling was performed by
the FLAC-program, using Mohr-Coulomb's failure criterion, average strength and elasticity
parameters. The methodology for rock mechanics modeling in data limited conditions was exploited.
Analysis showed that the roof calculation method includes very large factor of safety. Tributary area method was used for pillar design. It is recommended to use a monitoring system for estimation the stability of a mining block. Performed analysis and recommendations enable to im- prove the underground design quality in Estonia's oil shale mines. |