DBPapers
DOI: 10.5593/SGEM2015/B13/S3.043

GEOMECHANICAL MODELING AS A BASIS FOR INCREASING MINING SAFETY IN THE STRELTSOVSKOE ORE DEPOSITS

A. A. Kozyrev, I. M. Avetisian, I. E. Semenova
Friday 7 August 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-33-9 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 3, 329-336 pp

ABSTRACT
The uranium mines in the Streltsovskoe ore body are considered as rockburst hazardous ones. The efficient and safe mining operations in this region depend largely on timely regional forecast of forming the tension concentration zones, and consequently, rockburst hazard, under specific mining and geological conditions. Such forecast allows optimizing constructive parameters of mining methods and order of mining operations. Numerical methods are one of modern methods to predict stress fields.
The paper presents the experience in adopting SigmaGT, the special software with integrated designed different-scaled models of the Antey deposit, Streltsovskoe ore body, straight into the mining enterprise. The deposit is exposed to tectonic stresses which exceed the weight of overlapping rock thickness in 2.5 times; mining operations are carried out at the depth of 800 m.
The numerical modeling results are shown on stress-strain state of rock mass in the vicinity of the Antey deposit during different development stages. The calculations were performed by the finite element method in the volume setting. The technique of the consecutive approximations was applied in order to receive relevant results. The method is based on 3D numerical modeling of stress field on several scaled levels with considering principal geological and mining-technological factors. Modeling data were compared to those on location of areas with increased seismic hazard and occurrences of rock pressure in excavations.
The software with the models designed was installed in the equipment of the Service of predicting and preventing rockbursts. Mining engineers of the Service can now simulate development of stope and driving operations, reveal the areas with increased seismicity and choose measures for the rock mass unloads and excavations supporting. The tools were designed to export data of calculated stress fields into the MINEFRAME software which is used by the enterprise for planning and maintaining mining operations. There the data can be visualized jointly with geomechanical monitoring data.
The study has been carried out under the grant on priority areas of the Russian Scientific Fund activity “Fundamental scientific studies and pilot scientific studies performed by independent research teams” № 14-17-00751.

Keywords: geomechanics, stress-strain state, mathematical modeling, underground mining