Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia:

S. S. Neugomonov, Associate Professor, Candidate of Engineering Sciences, ssn_00@mail.ru
P. V. Volkov, Associate Professor, Candidate of Engineering Sciences

Vostoktsvetmet, Ust-Kamenogorsk, Kazakhstan:
A. A. Zhirnov, Chief Geotechnical Engineer

The article considers the issue of ensuring stability of mine tunnels in weak rocks using the reinforced combined support on the basis of self-fastening rock bolts (SZA) in Artemyevsk Mine of Vostoktsvetmet. The experience of Australian and Canadian mines show that support of mine tunnels in heavily deformable and rockburst-hazardous rocks should possess high energy absorption capacity, i.e., the support must be strong enough to withstand high loads, and at the same time flexible enough to permit a slight displacement of the walls of the mine. Aiming to estimate load-bearing capacity of concrete lining, it was decided to estimate wave impact of blasting (seismic vibration) expressed in terms of explosion output energy. The results of the full-scale trials show that the combination support technology in weak rocks using self-fastening friction-type rock bolts (SZA model) and MasterRoc STS 1510 shotcrete ensures stability of surfaces in tunnels and is applicable in Artemyevsk mine without signifi cant change in the list of available drilling, rockbolting and shotcreting machines, which favors transition to the described design of support.

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