Belaruskali, Soligorsk, Republic of Belarus:

S. I. Patiyuk, Director of Mine Management 4
Yu. B. Petrovskiy, Head of Underground Mine of Mine Management 4

Soligorsk Institute of Resources Saving Problems with Pilot Production, Soligorsk, Belarus:
V. Ya. Prushak, Director, Corresponding Member of the National Academy of Sciences of Belarus, ipr@sipr.by

The increase in mining depth (down to 900 m) at the Starobin potash salt deposit intensifies deformation of boundaries of permanent and development excavations by 2–3 times and shortens their life. The causes are both the limit long-term strength of adjoining rock mass and the amplification of spalling and schistocity of rocks. Stability of underground openings requires an integrated approach, including improvement of mining flow charts and introduction of safety and support technologies based on multi-level rock bolting systems of increased load-bearing capacity and yield. Based on the results of the mine tests of different support systems, it has been concluded that in potash mines at the Starobin deposit, the combination of rock support and surface reinforcement in permanent and development excavations and their junctures in the unfavorable, extremely difficult geological and geotechnical conditions at the mining depth down to 900 m ensures stability for the required time period. Application of the combination support jointly with compensation voids considerably enhances safety and stability of underground roadways.

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