Galurgia JSC (Perm, Russia):

Zhukov A. A., Head of Geophysics Laboratory, e-mail: Zhukov.Aleksandr@gallurgy.ru
Tarasov V. V., Head of Mining Laboratory

PPI-Geofizika Ltd. (Perm, Russia):
Prigara A. M., Director, Candidate of Engineering Sciences
Tsarev R. I., Engineer

The article reveals disadvantageous features of current techniques used in mine shaft lining inspection. The best suitable methods for inspection of potash mine shaft lining and the lining-adjacent rock mass are highlighted. The lining condition is assessed using a package of complementary nondestructive test methods, including geo radio location, thermal imaging and acoustic surveys. Georadar sounding defines thickness of concrete lining and locates heterogeneities in the lining layer and the lining-adjacent rocks. Options of telephotography and acoustic sounding as applied to handling the set problems are considered. It is found that the most efficient is the following sequence of the nondestructive test methods: first, georadar and thermal imaging are implemented as the promptest and real-time methods, then, if necessary, the acoustic sounding is carried out to authenticate detected abnormalities. The integrated analytic survey has identified some zones with probable karst cavities in rock mass adjacent to concrete lining. In the identified areas, verification holes were drilled, which showed that concrete thickness changed in the range from 43 to 97 cm. Correlation of the concrete thickness values obtained from the drilling results and geophysical survey allows connection of the geophysical survey and drilling data. In whole, effect of the nondestructive test methods is considered positive and the mentioned package of the nondestructive test methods is introduced as a promising approach to elimination of visual control shortcomings and for real-time inspection of mine shafts.

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