Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia:

A. A. Eremenko, Deputy Director of Science, Professor, Doctor of Engineering Sciences, eremenko@ngs.ru
A. I. Konurin, Researcher, Candidate of Engineering Sciences

Gornaya Shoria Division, Evraz United West-Siberian Metallurgical Plant, Tashtagol, Russia:
V. A. Shtirts, Head of Rockburst Prediction and Prevention Service

Gornaya Shoria Division, Evraz United West-Siberian Metallurgical Plant, Sheregesh, Russia:
V. V. Prib, Head of Rockburst Prediction and Prevention Service, Candidate of Engineering Sciences

The rapid increase in the mining depth at the Tashtagol iron ore deposit is accompanied by dynamic phenomena of rock pressure and complication of stoping. The geomechanical situation is particularly difficult in case of dynamic impact exerted on rock mass. The major dynamic events are represented by sudden movement of structural blocks along faults during blasting. The critical rockburst-hazardous depth in the deposit is 400 m. The revealed features of the abutment pressure distribution in the vicinity of stoping zone make it possible to formulate general provisions of the procedure for identification of hazardous zones in rock mass of the deposit. The authors have developed the procedure for calculation and mapping of hazardous zones deep in rock mass from the edges of stoping area. To this effect, the following objectives are met. The geodynamic behavior of rock mass in the zone of abutment pressure is assessed using the methods of micro-seismicity, electrometry and core drilling. The abutment pressure distribution is influenced by geological and geomechanical characteristics of the deposit. An emphasis is laid on the geotechnology, with increasing volume of stoping area with mining depth and with varied intensity blasting. As ore is being extracted, the field stress around the stoping zone changes and embraces ever growing area. It is found that hazardous zones permanently migrate in rock mass and are governed by the stress field parameters, configurations of stoping zones, impacts on ore bodies, etc. The concentration zones of different intensity bumps in the course of mining in different sections of ore body are identified, and the hazardous zones in enclosing rock mass are detected. The procedure is developed for calculating and mapping hazardous zones of increased rock pressure during mining. The parameters of hazardous zones in advanced overmining of ore bodies at the depths of 450–800 m are determined. The width of the hazardous zone varies from 30 to 35 m at different depths.

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