Sadovenko I.А., Tymoshchuk V.I., Zahrytsenko A.N., Dereviahina N.I. Evaluation of hydrogeomechanical risks for mining operations in the area of influence of floor operations

Details

Parent Category: Geo-Technical Mechanics, 2020

Category: Geo-Technical Mechanics, 2020, Issue 151

Geoteh. meh. 2020, 151, 190-202

DOI: https://doi.org/10.15407/geotm2020.151.190

Evaluation of hydrogeomechanical risks for mining operations in the area of influence of floor operations

¹Sadovenko I.А., ¹Tymoshchuk V.I., ¹Zahrytsenko A.N., ¹Dereviahina N.I.

¹National Technical University “Dnipro Polytechnic”

UDC 622.831:838.5

Language: Ukrainian

Abstract.

Justification of rational parameters of a barrier safety pillar using an example of real mining and technical situation near the flooded 1st southern stope of the seam l₂¹ of the southern slope of the Dobropilska mine of Industrial-Structural Enterprise “Colliery Group Dobropilske” for safe development of ventilation drift of the adjacent 2nd southern stope of the seam l₂¹. Numerical modelling of processes of non-stationary filtration in finite differences for determining predicted water inflows into the working, which is in the influence zone of developed and flooded areas. Estimation of a stress-strain state of rocks of the barrier (or safety) pillar in the influence zone of flooded workings is performed using the profile model of a mine fieldarea, where the solution results of problems of planned filtration on forming a field of pressures around mine workings are used.

It is established that the developed and flooded field of stopeshas a lasting draining influence oncoal–waste rock massif, while creating lowered values of pressures within the developed areas. In addition, permeability parameters of collapsed rocks approach the natural values in a process of their gravitational densification for 25 years. For sizes ofa safety pillar with width of 20 and 5 meters water inflows from the side of the flooded field have a secondary value and are 8…17 % of the total drainage of a new stope under design. During this, the risks of water influx from stratified zones of a roof of contiguous coal seamare present, where zones of the most intense crack looseningare formed in the interval of rock interlayer at joints of preparatory workings.

Parameters of safety pillar stability and risk of filtration water influx considering the changes of filtration, capacity, and geomechanical properties of a rock massif in time are qualitatively estimated for the first time. The estimation is based on a synthesis of models of non-stationary filtration in finite differences and profile finite-element hydrogeomechanical model of discrete medium.

Recommendations on determining the optimal size of a safety pillar in an influence zone of flooded workings are developed and introduced in production. The safety pillar ensures the safety of mining operations on the one hand and the completeness of coal extraction on the other one. Risks of water influx from stratified zones of a roof of contiguous coal seam can be minimized through preparation and development of diagonal stopes with a standard slope for water drainage.

Keywords:

hydrogeomechanical processes, flooding, barrier safety pillar, modelling, water inflow, deformations

References:

1.   Sadovenko, I., Zahrytsenko, A., Podvigina, O., Dereviahina, N. and Brzeźniak, S. (2018), “Methodical and Applied Aspects of Hydrodynamic Modeling of Options of Mining Operation Curtailment”, Solid State Phenomena, vol. 277, pp. 36-43.
https://doi.org/10.4028/www.scientific.net/SSP.277.36

2.   Hrinov, V.G. and Khorolskyi, A.A. (2018), “Improving the process of coal extraction based on the parameter optimization of mining equipment”, E3S Web of Conferences: Ukrainian School of Mining Engineering, vol. 60. pp. 1-10.
https://doi.org/10.1051/e3sconf/20186000017

3.   Loredo, С., Roqueñí, N. and Ordóñez, A. (2016), “Modelling flow and heat transfer in flooded mines for geothermal energy use”, International Journal of Coal Geology, vol. 164, pp. 115-122.
https://doi.org/10.1016/j.coal.2016.04.013

4.   Sadovenko, I., Inkin, O. and Zagrytsenko, А. (2016), “Theoretical and geotechnological fundamentals for the development of natural and man-made resources of coal deposits”, Mining of mineral deposits, no. 10 (4), рр. 1-10.
https://doi.org/10.15407/mining10.04.001

5.   Falshtynskyy, V., Dychkovskyy, R., Lozynskyy, V. and Saik, P. (2012), “New method for justification the technological parameters of coal gasification in the test setting”, Geomechanical Processes During Underground Mining, pp. 201‑208.
https://doi.org/10.1201/b13157-35

6.   Goerke-Mallet, P. and Drobniewski, M. (2013), “Planning long-term mine-water management for the Ibbenbüren coal basin”, XV International ISM Congress, Aachen (International Societz for MineSurvezing), pp. 319-324.

7.   Pedchenko, S.V. and Shiptenko, A.V. (2011), “Mining practices in the neighbourhood of the flooded mine workings”, Tractates of UkrRDIMGRMMS of NAS of Ukraine, no. 9 (1), pp. 80-88.

8.   Vervoort, A. and Declercq, P.-Y. (2018), “Upward surface movement above deep coal mines after closure and flooding of underground workings”, International Journal of Mining Science and Technology, no. 28(1), pp. 53-59.
https://doi.org/10.1016/j.ijmst.2017.11.008

9.   Sadovenko, I.A., Demchenko, Yu.I. and Ulitski, O.A. (2003), “Evaluation of geomechanical stability of intermine pillars”, Collection of scientific papers of NMU, no. 1(17), pp. 40-43.

10. Napa-García, G.F. and Navarro Torres (2017), “Applicability of failure strain for the stability evaluation of square pillars in room and pillar mining”, Proceedings of the First International Conference on Underground Mining Technology, Australian Centre for Geomechanics, Perth, pp. 557-565.
https://doi.org/10.36487/ACG_rep/1710_45_Napa-Garcia

11. Gao, W. and Mingming, G. (2016), “Stability of a coal pillar for strip mining based on an elastic-plastic analysis”, International Journal of Rock Mechanics and Mining Sciences, vol. 87, pp. 23-28.
https://doi.org/10.1016/j.ijrmms.2016.05.009

12. Sadovenko, I.A., Prokopenko, T.D., Yuzhakova, R.A. and Tishkov, V.V. (2007), “Modeling permeability of grouting mixture”, Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 3, pp. 8-11.

13. Khorolskyi, A., Hrinov, V., Mamaikin, O. and Demchenko, Y. (2019), “Models and methods to make decisions while mining production scheduling”, Mining of Mineral Deposits, vol. 13(4), pp. 53-62.
https://doi.org/10.33271/mining13.04.053

14. Ermakov, V.N., Semenov, A.P. and Ulitskiy, O.A. (2001), “Development of processes of flooding of the earth’s surface under the influence of the closing mines”, Ugol Ukrainy, no. 6, pp. 12-13.

15. Barnett, B., Townley, L., Post, V., Evans, R. et al. (2012), “Australian groundwater modeling guidelines”, Waterlines Report Series, 82, pp. 204.

16. Otto, C. and Kempka, T. (2017), “Prediction of Steam Jacket Dynamics and Water Balances in Underground Coal”, Gasification Energies, no. 10(6), pp. 739.
https://doi.org/10.3390/en10060739

About the authors:

Sadovenko Ivan Oleksandrovych, Doctor of Technical Sciences, Professor, Professor at Department of Hydrogeology and Engineering Geology, National Technical University “Dnipro Polytechnic”, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Tymoshchuk Vasyl Ipolitovych, Candidate of Technical Sciences, Associate Professor at Department of Hydrogeology and Engineering Geology, National Technical University “Dnipro Polytechnic”, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Zahrytsenko Alina Mykolaivna, Candidate of Technical Sciences, Associate Professor at Department of Hydrogeology and Engineering Geology, National Technical University “Dnipro Polytechnic”, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Dereviahina Nataliia Ivanіvna, Candidate of Technical Sciences, Associate Professor at Department of Hydrogeology and Engineering Geology, National Technical University “Dnipro Polytechnic”, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

• < Prev
• Next >