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Rock mass structure assessment on the destress borehole surface in rock pillar in Sheregesh Mine

The geological and geotechnical analyses show that rocks of Sheregesh deposit feature high stress and intense jointing. Enclosing rocks (syenite, scarn, diorite, porphyrite, granite and sandstone) possess high elasticity and brittle fracture ability. In deeper level mining and during blasting at different sites of the mine field, rock mass experiences stress redistribution, geodynamic phenomena and higher rock pressure, which damages blastholes and destress boreholes. The boreholes are inspected visually using a surveillance system of Sheregesh Mine. The fracture behavior in the destress boreholes is defined. The various jointing zones are identified—from a monolith and to extremely jointed rocks. The fracture mechanism in the boreholes situated in broken and extremely jointed zones is determined: it points at the stress relaxation in rock mass by 60–70%. The rock mass jointing zones are identified from axial and transverse joints at different depths and on different measurement sites. In broken and extremely jointed rock mass, contraction of boreholes with the formation of an ellipse-shaped cross-sections was observed.

Keywords: deposit, ore, destress borehole, stress, joint, fault, rock mass, dynamic activity.
For citation:

Eremenko A. A., Koltyshev V. N., Uzun E. E., Khristolyubov E. A. Rock mass structure assessment on the destress borehole surface in rock pillar in Sheregesh Mine. MIAB. Mining Inf. Anal. Bull. 2023;(11):91-101. [In Russ]. DOI: 10.25018/0236_1493_2023_11_0_91.

Acknowledgements:
Issue number: 11
Year: 2023
Page number: 91-101
ISBN: 0236-1493
UDK: 622.83
DOI: 10.25018/0236_1493_2023_11_0_91
Article receipt date: 07.02.2023
Date of review receipt: 26.04.2023
Date of the editorial board′s decision on the article′s publishing: 10.10.2023
About authors:

A.A. Eremenko1, Dr. Sci. (Eng.), Professor, Chief Researcher, ORCID ID: 0000-0002-7342-7617,
V.N. Koltyshev1, Junior Researcher, e-mail: Witalq@mail.ru, ORCID ID: 0009-0005-1810-8137,
E.E. Uzun2, Head of PPGU Section, e-mail: Ekaterina.uzun@evraz.com,
E.A. Khristolyubov2, Chief Construction Supervision Specialis,
1 Chinakal Institute of Mining of Siberian Branch of Russian Academy of Sciences, 630091, Novosibirsk, Russia,
2 Gorno-Shor branch of EVRAZ ZSMK JSC, 652971, Sheregesh, Russia.

 

For contacts:

E.E. Uzun, e-mail: Ekaterina.uzun@evraz.com.

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