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.

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.

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.

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

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