NorNickel’s Polar Division, Norilsk, Russia

T. P. Darbinyan, Director of Mining Production Department, Candidate of Engineering Sciences, DarbinyanTP@nornik.ru
A. V. Bylkov, First Deputy Director of Mineral Resources and Mineral Supplies
A. A. Tsymbalov, Deputy Director of Mining Production

College of Mining, National University of Science and Technology “MISIS”, Moscow, Russia
M. S. Pleshko, Professor, Doctor of Engineering Sciences

In mines vertical shafts are constructed in integration with various roadways joined with the shafts. Multiple research of vertical shafts shows that junctions of the shafts and roadways feature up to 75 % of critical damage in the shaft structure, and their maintenance-free operations is no longer than 3–4 years sometimes. In this respect, in construction of SKS-1 shaft in Skalisty Mine, NorNickel’s Polar Division, for joined roadways at great depths, an innovative heading scheme with the advanced mixed-type ground support and reinforcement system was employed. Concurrently, the stress–strain monitoring was performed in the mine support together with the stability estimation of roadways using the field inspection and calculation techniques. The deepest-set measurement station was placed in a shaft roadway at the depth of 2048.5 m. From the observation data collected for one year and a quarter, in the permanent support of the shaft-joined roadway, deformation is stabilized at all monitoring points and at a relatively low loading. Concrete of the lining works elastically (deformation stage I), and the roadway is steady-state. The research findings allow concluding that the proposed scheme of the stress–strain monitoring in a roadway joined to a mine shaft is a simple and effective method of stability evaluation. The wire-type transducers placed in concrete are sufficiently reliable and durable, have a comparatively low cost and provide continuous and objective information on deformation processes in roadway support systems.

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