Study the possibility of realistically numerical simulation of a jointed 
rock  mass  and  estimate  the  design  rock  mass  strength  involving  discontinuity 
surface conditions and various shapes and sizes of rock blocks

BABETS, Dmytro

SOSNA, Dmytro

Бабец, Д. В.

Бабец, Дмитрий Владимирович

Бабець, Д. В.

Бабець, Дмитро Володимирович

Сосна, Д. О.

Сосна, Дмитрий Олегович

Сосна, Дмитро Олегович

English

Scientific hub Dnipro University of Technology

27  References 1. Gajdaj O. Development technogenic deposits by the technology production of composite fuel / O. Gajdaj, V. Ruskyh // Materials of the International Scientific & Practical Conference «Energy Efficiency and Energy Saving 2017» (Program of reports) Матеріали міжнародної науково-практичної конференції «Енергоефективність та енергозбереження 2017» (програма виступів); November 16–17, 2017, Ministry of Educ. & Science of Ukraine, National Mining University. – Dnipro: NMU, 2017. – P. 17–18. 2. Gayday O. Researches of structural-mechanical properties of coal tailings as disperse systems / O. Gayday // Annual Scientific-Technical Collection. Leiden, The Netherland. – Press/Balkema, 2013. – Р. 327–331. 3. Ruskyh, V.V., Gayday, A.A. (2013). O primenenii programmnogo obespechenija “MineModeler” v uslovijah shaht PAO DTEK «Pavlogradugol'». Sbornik nauchnyh trudov Visnyk Natsionalnoho Hirnychoho Universytetu, (41), 98-102. 4. Гайдай А. А., Сулаев В. И. Технология адгезионо-химического окускования  угольных шламов и штыбов, бурого угля и торфа / А. А. Гайдай, В. И. Сулаев // Уголь Украины. – 2013. – № 1. – С. 39–43.  5. Дичковський Р.О. (2013). Наукові засади синтезу технологій видобування вугілля у слабометаморфізованих породах. Видавництво НГУ, 262. 6. Бондаренко В. И. Экологические аспекты и технологические решения отработки весьма тонких угольных пластов Западного Донбасса / В. И. Бондаренко, В. И. Сулаев, А. Г. Кошка, А. А.Гайдай, А. И. Яркович  // Матер. VІ Міжнар. наук.-практичної конф «Школа підземної розробки» 24–28 жовтня 2012 р. – Дніпропетровськ-Ялта, 2012. – С. 48–52.   NUMERICAL SIMULATION OF JOINTED ROCK MASS IN GEOMECHANICAL PROBLEMS  BABETS Dmytro & SOSNA Dmytro Dnipro University of Technology, Dnipro, Ukraine  Purpose. Study the possibility of realistically numerical simulation of a jointed rock mass and estimate the design rock mass strength involving discontinuity surface conditions and various shapes and sizes of rock blocks. Methodology. The stress-strain state of rock mass could be determined using one of the numerical methods. We apply the finite element method (FEM) well proven in geomechanics problems in combination with the strength theory in the nonlinear formulation.  Findings. The reliability of numerical simulation depends on the reliability of determining the physical and mechanical properties of rocks. The Western Donbas 28  rocks can be characterized as poor-quality, jointed rocks and compressive strength significantly decreases due to watering. Decrease in the strength of the intact rock should be considered using structural factor which can be determined according to statistical strength theory. Numerical simulation is carried out to determine the displacement of excavation contour and configuration and dimension of the yielding area. The effect of discontinuity parameters such as distance between joints, orientation of joints and discontinuity surface conditions on the results of numerical simulation of stress-strain state is estimated. The correspondence between domestic rock mass stability system and classification based on Geological Strength Index is specified. It provides a possibility of designing the mining excavations using a good proven generalized Hoek-Brown strength criterion considering natural and technogenic disturbance of rocks. They contain the research conducted within the project DZ – 151 (DB-2), financed by Ministry of Education and Science of Ukraine. Key words: Structural Factor, Rock Joints, Rock Mass Strength, Statistical Strength Theory  References  1. Sdvyzhkova, О.О., Babets, D.V., Smirnov, A.V. (2014). Support loading of assembly chamber in terms of Western Donbas plough longwall. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. (5), 26-32. 2. Sdvyzhkova, O., Gapeiev, S., & Tykhonenko, V. (2015). Stochastic model of rock mass strength in terms of random distance between joints. New Developments in Mining Engineering, 299-303. 3. Marinos, P., & Hoek, E. (2000). GSI – A geologically friendly tool for rock mass strength estimation. Proc. GeoEng2000 Conference, 1422-1446. 4. Khalimendik, Yu. M., Martovskiy, A.V., Sdvyzhkova, O.O. & Shashenko, O.M. (2011). Geomechanical processes in rocks around longwalls in terms of coal mine “Samarskaya”. Proceedings of 22nd World Mining Congress & Expo. Ankara, Turkey, “Audogdu Ofset”, 119-124. 5. Vladyko, O., Kononenko, M., & Khomenko, O. (2012). Imitating modeling stability of mine workings. Geomechanical Processes During Underground Mining, 147-150. doi: 10.1201/b13157-26 6. Pivnyak, G., Dychkovskyi, R., Smirnov, A., Cherednichenko, Yu. (2013) Some aspects on the software simulation implementation in thin coal seams mining. Energy Efficiency Improvement of Geotechnical Systems - Proceedings of the International Forum on Energy Efficiency. 1‒10. DOI: 10.1201/b16355-2  7. Pivnyak, G., Dychkovskyi, R, Bobyliov, O., Cabana, C.E., Smoliński, A. (2018). Mathematical and Geomechanical Model in Physical and Chemical Processes of Underground Coal Gasification. Solid State Phenomena, (277), 1-16. doi: https://doi.org/10.4028/www.scientific.net/SSP.277.1 29  8. Babets, D.V., Sdvyzhkova, О.О., Larionov, M.H., & Tereshchuk, R.M. (2017). Estimation of rock mass stability based on probability approach and rating systems. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. (2), 58-64. 9. Babets, D. (2018) Rock Mass Strength Estimation Using Structural Factor Based on Statistical Strength Theory. Solid State Phenomena, Vol. 277, pp. 111-122. https://doi.org/10.4028/www.scientific.net/SSP.277.111 10. Hoek, E., Carter, T.G., & Diederichs, M.S. (2013). Quantification of the geological strength index chart. Proceedings of the 47th US Rock Mechanics, 1-8. 11. Khomenko, O. et al., (2018) Classification of Theories about Rock Pressure, Solid State Phenomena, Vol. 277, pp. 157-167   SUBSTANTIATION OF THE TECHNOLOGICAL CONDITIONS OF OPEN PITS’ CONSERVATION  CHEREP Andrii, PILOVA Dar’ya & MORMUL Taras Dnipro University of Technology, Dnipro, Ukraine  Purpose. Theoretical definition of the matter of stand-by condition of production facilities at an open-pit and the development of technological approaches to its implementation under the operation of flat deposits; generalization of practical recommendations for meeting demand on mineral resources. The methodology of research is scientific substantiation of stand-by condition of the fixed assets on the basis of the temporary stop of open-pit’s equipment, mining workings and surface structure in accordance with the necessary preservation of their working condition for the further exploitation due to the market demand for the products. Findings. The special aspects of domestic open-pits on the exploitation of flat deposits, which are characterized by large geometric parameters and production capacity, are analyzed. This significantly increases the cost of production and makes it impossible competing. According to the above, the technological scheme for the mining of temporarily of stand-by condition of ore in the final extraction of reserves is developed. In order to reduce the cost of overburden, due to the large parameters of the production space of the open-pit, the technological scheme of separation of the open-pit field into two parts of which one plot is temporarily under stand-by condition, is developed. The required stability of the non-operating of open-pit side and dump side is provided by the certain set of measures which are proposed by the authors (by changing the parameters of the development system and organization of mining and transport operations in the working area of the open-pit). 

NUMERICAL SIMULATION OF JOINTED ROCK MASS IN  GEOMECHANICAL PROBLEMS

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NUMERICAL SIMULATION OF JOINTED ROCK MASS IN GEOMECHANICAL PROBLEMS

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