2019-8-4

УДК 622.831 DOI: 10.21440/0536-1028-2019-8-30-37 Download

Sosnovskaia E. L., Avdeev A. N. Forecasting potential rockburst hazard of Kholbinsky mine lower horizons. Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal = News of the Higher Institutions. Mining Journal. 2019; 8: 30–37 (In Russ.). DOI: 10.21440/0536-1028-2019-8-30-37

ABSTRACT

Introduction. In 2016–2017 the lower horizons of Kholbinsky mine showed harmful rock pressure manifestation in the shape of detachment and caving of rock blocks. There is a critical need to specify geomechanical conditions in the mine in order to estimate the hazard level of currently operating and new mine workings.
Methodology. In the course of the research, a complex of methods and techniques including laboratory experiments on strength and elastic properties of rocks; spatial and statistic analysis of rock jointing; analysis of the level of kern disking in the marginal massif of prospecting holes; in-situ measurement of natural stresses by the method of crack release by the method of IM UB RAS; engineering and mathematical calculations of technogenic stresses in design elements of geotechnologies by proprietary techniques; mathematical modelling by the finite element method; visual observations of mine workings baring stability level, etc.
Results. It has been stated that a massif of rocks of Kholbinskymine lower horizons is caregorized as “nonhazardous”. Mine workings and pillars are in the unstable state. Statistic forms of rock pressure manifestation have been recorded. In order to improve the stability of support systems design elements, a complex of engineering-technical measures is required, including: well-timed extraction floor and intervening pillars; block reserves extraction term reduction; switch to rockburst-safe systems with backfilling; excavation walls supporting with anchors, etc. A final Report on rockbust hazard and gasdynamic manifestations at Zun-Kholba goldmine has been worked out according to the results of the research (2017).

Key words: narrow and large gold lodes; stability; rockburst hazard; mine workings; pillars; physicalmechanical properties of rocks; natural and technogenic stresses.

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Received 12 July 2019

 

 

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