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ArticleName Geomechanical supervision of underground mining at Kombinat KMAruda
DOI 10.17580/gzh.2019.08.05
ArticleAuthor Sergeev S. V., Sinitsa I. V.

VIOGEM Institute, Belgorod, Russia:

S. V. Sergeev, Head of Laboratory, Professor, Doctor of Engineering Sciences,
I. V. Sinitsa, Senior Researcher, Candidate of Engineering Sciences


VIOGEM Institute had been conducting geomechanics-based studies at the Gubkin mine from 1969 to 2014. They included in-situ assessment of natural stress state in rock mass, survey of mining system elements, as well as observations of surface and underground movement in the mining-affected areas. As the mining operations reached the depth of 500 m, a need arose to assess the rock-burst proneness of the rock mass. In 2012, the Research Center of the Saint-Petersburg Mining University carried out geodynamic zoning of the Korobkovsky deposit of ferruginous quartzites. Based on the results, VIOGEM has been monitoring the behavior of the most problematic areas to assess the rock mass proneness to bursting. To monitor the rock-mass proneness to bursting we used the following methods: destress slotting, stress relief at large bases and geophysical vibroseis method. Deformation measurements and stress calculation made for one of the 125 m horizon sections evidenced that the stress in the rock mass did not exceed the unconfined compressive strength limit, taking into account a coefficient of 0.8. Therefore, the rock mass is unlikely to be prone to rock bursts. These results are confirmed by geophysical studies and by the similar results obtained other sections. Iron ore mining is carried out by the room-and-pillar method. To assess the stepwise rooming impact on the strain–stress behavior of pillars, we used a technique involving stress assessment in the pillars in the course of extraction of the rooms. We conducted three observation cycles at different working stages in the same room. The technique has proved is efficiency and will be applied in future during room-and-pilllar mining.

keywords Geomechanical studies, rock masses, rock burst proneness, stress measurements by destressing methods

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