ESTIMATION OF CRITICAL DEPTH OF DEPOSITS BY ROCK BUMP HAZARD CONDITION
- Belgorod State National Research University
Abstract
During the development of minerals by the underground method, dynamic manifestations of rock pressure occur at a certain depth, which significantly reduces the safety of mining operations. Regulatory documents prescribe at the exploration and design stages to establish the critical depth for classifying a deposit as liable to rock bumps. Currently, there are a number, mainly instrumental, methods for determining the liability of rock mass to rock bumps and methods based on the determination of physical and technical properties and the stress-strain state of rock massifs. The paper proposes a theoretical method for determining the critical depth for classifying a deposit as liable to rock bumps. A formula for determining the critical depth of the rock bump hazard condition is obtained. A mathematical analysis of the influence of the physical and technical parameters of the formula on the critical depth is carried out. Its physical and mathematical validity is substantiated. The numerical calculations of the critical depth for 17 developed fields were carried out using a simplified formula. It also provides a comparison of calculated and actual critical depth values. It is established that the variation of the actual and calculated critical depth is due to the lack of actual data on the value of the friction coefficient and parameters of fracturing of the rock mass in the simplified formula. A simplified calculation formula can be used to estimate the critical depth of a field at the survey and design stages. More accurate results can be obtained if there are actual data on fracture parameters, friction coefficients and stress concentration near the working areas.
References
- Aksenov A.A. Improving the practice of classifying deposits as liable to rock bursts. Bezopasnost' truda v promyshlennosti. 2018. N 1, p. 58-60. DOI: 10.24000/0409-2961-218-1-58-60 (in Russian).
- Rasskazov I.Yu., Saksin B.G., Usikov V.I., Potapchuk M.I. Geodynamic state of the rock massif of the Nikolaev polymetallic deposit and the characteristics of the manifestation of rock bump hazard during its development. Gornyi zhurnal. 2016. N 12,
- р. 23-25. DOI: 10.17580/gzh.2016.12.03(in Russian).
- Freidin A.M., Neverov S.A., Neverov A.A., Konurin A.I. Geomechanical evaluation of geotechnologies for underground min-ing of ores at the design stage. Gornyi zhurnal. 2016. N 2, p. 39-44. DOI: 10.17580/gzh.2016.02.08 (in Russian).
- Kuranov A.D. The use of numerical modeling to select the safe parameters of ore deposits development systems in the highly stressed rock mass. Zapiski Gornogo instituta. 2013. Vol. 206, p. 60-64 (in Russian).
- Lomakin V.S., Grigorovich S.V., Potekhin R.P., Khalevin N.I. On the relationship of the volume of the focal destruction zone with the seismic energy of rock bursts. Geologiya i geofizika. 1989. N 5, p. 129-132 (in Russian).
- Petukhov I.M. Classification of rock bumps. Bezopasnost' truda v promyshlennosti. 1987. N 12, р. 41-43 (in Russian).
- Petukhov I.M. On the nature of pulsing impact rock mass deformation. Gornyi zhurnal. 1989. N 7, p.45-48 (in Russian).
- Rasskazov I.Yu. Control and management of rock pressure in the mines of the Far Eastern region. Moscow: Gornaya kniga, 2008, p. 329 (in Russian).
- Reference (inventory) of the physical properties of rocks. Pod red. N.V.Mel'nikova, V.V.Rzhevskogo, M.M.Protod'yakonova. Moscow: Nedra, 1975, р. 279 (in Russian).
- Tyupin V.N. Explosive and geomechanical processes in the fractured strained rock mass. Belgorodskii natsional'nyi issle-dovatel'skii universitet. Belgorod, 2017. p. 192 (in Russian).
- Wang N., Wan B.H., Zhang P., Du X.L. Analysis on deformation development of open-pit slope under the influence of un-derground mining. Proceedings of International Symposium on Land Reclamation and Ecological Restoration. Beijing. China. 2015, p. 53-58.
- Braun L.G. Seismic hazard evaluation using apparent stress ratio for mining-induced seismic events. Ph. D. Thesis, Lauren-tian University, 2015, p.257.
- Ingraham M.D., Issen K.A., Holcomb D.J. Use of acoustic emission to investigate localization in high-porosity sandstone subjected to true triaxial stresses. Acta Geotechnica. 2013. Vol. 8. N 6, p. 646-663.
- Marcak M., Mutke G. Seismic activation of tectonic stresses by mining. Journal of Seismology. 2013.Vol. 17. N 4, р. 1139-1148.
- Snelling P.E., Godin L., McKinnon S.D. The role of geologic structure and stress in triggering remote seismicity in Creighton Mine, Sudbury, Canada. International Journal of Rock Mechanics and Mining Sciences. 2013. Vol. 58, p. 166-179.
- Young D.P. Energy variations in mining-induced seismic events using apparent stress. MASc Thesis. Laurentian University, 2012, p. 85.
- Wesseloo J., Woodward K., Pereira J. Grid-based analysis of seismic data. The Journal of Southern African Institute of Min-ing and Metallurgy. 2014. Vol. 114, p. 815-822.