Integrated deformation monitoring of the northwestern wall of Glavny open pit of EVRAZ KGOK

The article analyzes deformation of the northwestern wall of Glavny open pit of EVRAZ KGOK. The integrated monitoring was applied to study deformations and to ensure safety of mining operations. The integrated monitoring included the engineering and geological study of the structure and tectonics of the pit wall rock mass with mapping of unfavorably oriented extended cracks, faults and fragmentation zones, as well as the instrumental surveying observations using an electronic tacheometer, areal monitoring of the quarry sides with use of the RIEGL ground-based laser scanning system, inspection of displacements of check points of the geodynamic test site, and the estimate of changes in the stress–strain behavior of pit wall rock mass using the satellite geodesy technologies. The studies of deformation development in rock mass after recommencement of mining operations, including blasting on the northwestern pit wall are presented. It is found that gravitational and tectonic deformations prevail periodically. Initially, blasting, excavation and loading operations activated movability of rock mass. Subsequently, after mining-out of upper part of the pit wall and with increasing depth of the open pit, the displacement amplitude and PPV in the direction toward the mined-out void decreased. It is recommended to reduce deformations by implementing simultaneous operation on a few benches to provide the cutback at the top of the pit wall and with intent to diminish the active pressure wedge.

Yakovlev A. V., Perekhod T. M., Shimkiv E. S., Tynynyka L. V. Integrated deformation monitoring of the northwestern wall of Glavny open pit of EVRAZ KGOK. MIAB. Mining Inf. Anal. Bull. 2021;(5—2):181—191. [In Russ]. DOI: 10.25018/0236_1493_2021_52_0_181.

The article is prepared under the State Contract on the Methods to Take into Account Transient Technological Processes in Mining Deep-Sated Mineral Deposits of Complex Structure, Topic No. 0405-2019-0005.

Yakovlev A. V., Head of Laboratory of Open Geotechnology, Cand. Sci. (Eng.),
Perekhod T. M., Leading Engineer,
Shimkiv E. S., Research Worker,
Institute of Mining Ural branch of Russian Academy of Sciences, Ekaterinburg, Russia, lubk_igd@mail.ru;
Tynynyka L. V., Head of the mine surveying department of SGM AO EVRAZ KGOK, Kachkanar, Sverdlovsk region, Russia.

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