2019-6-5

DOI: 10.21440/0536-1028-2019-6-41-50

Kozyrev A. A., Kuznetsov N. N., Fedotova Iu. V., Shokov A. N. The determination of rockburst hazard degree of hard rocks by the test results under uniaxial compression. Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal = News of the Higher Institutions. Mining Journal. 2019; 6: 41–50 (In Russ.). DOI: 10.21440/0536-1028-2019-6-41-50

Introduction. Currently the principal approach to the estimation of rock tendency to rockburst hazard consists in analyzing their complete stress-strain curve and defining the post-peak strain and energy parameters under uniaxial compression conditions. The disadvantage of such method is a need of performing the studies on specialized stiff test machines. The possibility of such machines purchasing is limited by their high prices and unit quantity of production.
Research aim. Our work is aimed at comparing the determination results of rockburst hazard in the Khibiny and Kovdor rock massifs of the Murmansk region by applying the method proposed and a method of the complete stress-strain curve analysis of hard rocks with using stiff test machines.
Methodology. Energy parameters and strain characteristics of hard rocks have been experimentally studied, parameters and characteristics of their rockburst hazard have been determined. We propose a more simple method to determine the rockburst hazard for rocks by analyzing the strain curve at a prepeak region and values of elastic energy accumulated till the compressive strength. For this we do not need the test machines with enhanced stiffness and the laboratory studies are performed on usual equipment by standard methods.
Results. Based on the studies, we determined the strain and energy parameters of the hard rocks, investigated and defined their rockburst category – rockburst hazardous or not.
Conclusions. The obtained data made it possible to conclude that the estimation results of rockburst hazard for the rocks at the pre-peak stage fully correspond to the results of estimation carried out on the basis of complete deformation curve analysis.

Key words: rockburst hazard; deformation; elastic energy; hard rocks; laboratory tests; uniaxial
compression; sample.

 

REFERENCES

1. Kozyrev A. A., Panin V. I., Maltsev V. A., Akkuratov M. V. Prediction and prevention of rockbursts and man-induced earthquakes on the Khibiny apatite mines. In: Geomechanics of mining in highly-strained massifs: collection of scientific articles. Apatity: 1998. p. 73–82. (In Russ.)
2. Lan T., Chzhan H., Batugina I. M., Juj L., Li Sh., Han C., Sun V., Tan G. Research of rocckburst system energy of coal mine. Gornyi informatsionno-analiticheskii biulleten (nauchno-tekhnicheskii zhurnal) =Mining Informational and Analytical Bulletin (scientific and technical journal). 2015; 6: 287–292. (In Russ.)
3. Kabwe E., Wang Y. Review on rockburst theory and types of rock support in rockburst prone mines. Open Journal of Safety Science and Technology. 2015; 5: 104–121.
4. Cai M. Prediction and prevention of rockburst in metal mines. A case study of Sanshandao gold mine. Journal of Rock Mechanics and Geotechnical Engineering. 2016; 8: 204–211.
5. Ptacek J. Rockburst in Ostrava-Karvina coalfield. Procedia Engineering. 2017; 191: 1144–1151.
6. Turchaninov I. A., Iofis M. A., Kasparyan E. V. The fundamentals of rock mechanics. St. Petersburg: Nedra Publishing; 1977. (In Russ.)
7. Petukhov I. M., Iliin A. M., Trubetskoi K. N. Prediction and prevention of rockbursts in mines. Moscow: Akademiia gornykh nauk Publishing; 1997. (In Russ.)
8. Petuhov I. M., Linkov A. M. Mechanics of rockbursts and bumps. Moscow: Nedra Publishing; 1983. (In Russ.)
9. Stavrogin A. N., Protosenia A. G. The strength of rocks and stability of workings at great depths. Moscow: Nedra Publishing; 1985. (In Russ.)
10. Singh S. P. Technical note. Burst energy release index. Rock Mechanics and Rock Engineering. 1988; 21: 149–155.
11. Zhao T., Guo W., Yu F., Tan Y., Huang B., Hu S. Numerical investigation of influence of drilling
arrangements on the mechanical behavior and energy evolution of coal models. Advances in Civil Engineering. 2018. Available from: https://www.hindawi.com/journals/ace/aip/3817397 [Accessed 21 January 2019].
12. Kidybiski A. Bursting liability indices of coal. International Journal of Rock Mechanics and Mining Science & Geomechanics Abstract. 1981; 18 (4): 295–304.
13. Tarasov B. G. Superbrittleness of rocks at high confining pressure. Deep Mining, Australian Centre for Geomechanics. Perth, 2010, pp. 119–133.
14. Kozyrev A. A., Kasparian E. V., Fedotova Iu. V., Kuznetsov N. N. Estimating the rockburst hazard of hard rocks based on laboratory test results. Vestnik MGTU: Trudy Murmanskogo gosudarstvennogo tekhnicheskogo universiteta = Vestnik of MSTU: Scientific Journal of Murmansk State Technical University, 2019; 22 (1): 138–148. (In Russ.)
15. Kuznetsov N. N., Fedotova I. V., Pak A. K. Strain and energy parameters of burst-prone rocks: study and analysis. In: Proceedings of the 3rd International Conference on Rock Dynamics and Applications (RocDyn-3), Trondheim, Norway. 2018. p. 281–284.

Received 7 May 2019

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