Vlasenko V.V., Dudlia K.Ye., Kyrychenko M.S. Mathematical model of the cracking process in the coal-rock massif under hydrodynamic impact

Деталі
Батьківська категорія: Геотехнічна механіка, 2019
Категорія: Геотехнічна механіка, 2019, № 147

Geoteh. meh. 2019, 147, 172-182

https://doi.org/10.1051/e3sconf/201910900111

Mathematical model of the cracking process in the coal-rock massif under hydrodynamic impact

1Vlasenko V.V., 1Dudlia K.Ye., 2Kyrychenko M.S.

1Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine, 2National Technical University Dnipro Polytechnic

UDC [622.023.62:532.5].001.57          

Language: English

Abstract.

. The research results of the hydrodynamic impact method on a stressed gas-saturated mountain massif are presented in the article. The object of study is the process parameters of hydrodynamic effects on a stressed gas-saturated coal massif. Subject of study is the process of cracking in a coal seam with hydrodynamic effects on it.

The physics of hydrodynamic impact is in the softening of the coal seam due to the generation of alternation stress in it. Stress is carried out due to injection and discharge of fluid into the coal seam in the filtration mode. To determine the process parameters that can vary filtering modes, the physical model of the process and an algorithm for its mathematical solution was developed. The model allows to determine the nature of the coal destruction in forward and inverse filtering of fluid in the mass.

For the solution, the finite difference method is used. Calculations performed at parameter’s values close to experimental investigation that was previously realized. The purpose of these calculations is to establish the role of each foregoing hydrodynamic impact process parameters, namely, on the process of destruction of the coal massif. As practical experience shows the breaking strength of a coal substance has an essential role in initiation of a sudden blast process. Therefore, the role of this parameter in the hydrodynamic impact process is investigated.

Determined that, cracking in the process of fluid filtration is achieved while simultaneously fulfilling two criteria: power and energy. During the hydrodynamic impact on a coal massif, it is possible to influence on the stress state by the changing the fluid flow mode in the pore space. With a decrease of the strength of the coal substance on the crack, the generation of the first crack is carried out earlier than in the above calculations; the size of the first piece of coal decreases with decreasing relative to the value sb in relation to the value scr; the distances between the cracks are equidistant; the water pressure in the pores of the coal formed pieces quickly tends to the pressure value in the well.

Keywords: hydrodynamic impact, gas-dynamic phenomena, coal seam, cracking, outburst coal seam.

References

1. Samaskiy, A.A. (1989), Teoriia raznostnyh shem[Theory of difference schemes]. Nauka, Moscow, Russia.

2. Matchenko, V.A. and Sadovenko, I.A. (2014), “Investigation of deformation features of non-ideally elastic rocks”, Naukonyy visnyk NMU, no. 6, pp. 80-86.

3. Sofiyskiy, K.K., Silin, D.P., Vlasenko, V.V. and Kolchin, G.I. (2012), “The change in the state of the mountain massif as a result of hydrodynamic inpact”, Materials deformation and destruction with defects and dynamic phenomena in rocks and working, Simferopil, Ukraine, pp. 317-319.

4. Sadovenko, I.A., Inkin, A.V., Yakubovskaya, Z.N. and Maksimova-Gulyayeva, N.A. (2012), “Estimation of gas losses during storage in aquifers of Western Donbass”, Naukovyy visnyk NMU, no. 6, pp. 18-24.

5. Sadovenko, I.O., Inkin, O.V., Zholudev, S.V. (2012). Mihratsiya i teploperenos navkolo pidzemnoho hazoheneratora [Migration and heat transfer around an underground gas generator], National Mining University, Dnipropetrovsk, Ukraine

6. Zorin, A.N., Kolesnikov, V.G. and Didenko, A.T. (1984). “Impulse wave perturbation in a well in the pneumo-hydraulic method of coal production”, Fiziko-tekhnicheskiye problemy razrabotki poleznykh iskopayemykh, no. 4, pp. 88-92.

7. Vlasenko, V., Gavrilov, V. and Moskovskiy O. (2015), Influence of hydrodynamic impact on degassing of steep coal seam at the top of the overhead longwall, New developments in mining engineering Theoretical and practical solutions of mineral resolurces mining, The Netherlands, EN Leiden: CRC Press/Balkema, pp. 369-372

8. Vlasenko, V., Agaiev, R., Dudlia, K., Kyrychenko M. and Prytula D. (2017), “On the Possibility of Coalbed Methane Extraction as a Source of Energy under the Hydrodynamic Impact on the Outburst Coal Seam”. Advanced Engineering Forum Submitted, Switzerland: Trans Tech Publications, no. 25, pp. 106-112

9. Agaiev, R., Katulskyi, O. and Prytula, D. (2015), Intensification of coalbed methane recovery through the surface degasing borehole, New developments in mining engineering Theoretical and practical solutions of mineral resolurces mining, The Netherlands, EN Leiden: CRC Press/Balkema, pp. 575-578

10. Vlasenko, V.V., Zhitlenok, D.M., Moskovskiy, O.V. and Starodubtsev, S.V. (2009). The criterion for the destruction of coal during hydrodynamic impact on the seam, Geotekhnicheskaya mekhanika [Geo-technical mechanics], no. 81, pp. 227-232.

About the authors

Vlasenko Vasyl Victorovych, Candidate of Technical Sciences (Ph. D.), Senior Researcher of Department of Underground Coal Mining Technology, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NAS of Ukraine), Dnipro, Ukraine,   Ця електронна адреса захищена від спам-ботів. вам потрібно увімкнути JavaScript, щоб побачити її.

Dudlia Kateryna Yevheniivna,Candidate of Technical Sciences (Ph. D.), Researcher of Department of Underground Coal Mining Technology, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NAS of Ukraine), Dnipro, Ukraine, Ця електронна адреса захищена від спам-ботів. вам потрібно увімкнути JavaScript, щоб побачити її.

Kyrychenko Maryna Serhiivna, Assistant Lecturer of Department of Power Engineering, National Technical University Dnipro Polytechnic (NTU “DP”), Dnipro, Ukraine, Ця електронна адреса захищена від спам-ботів. вам потрібно увімкнути JavaScript, щоб побачити її.