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

Details

Parent Category: Geo-Technical Mechanics, 2019

Category: Geo-Technical Mechanics, 2019, Issue 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 s_b in relation to the value s_cr; 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

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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,   This email address is being protected from spambots. You need JavaScript enabled to view it.

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, This email address is being protected from spambots. You need JavaScript enabled to view it.

Kyrychenko Maryna Serhiivna, Assistant Lecturer of Department of Power Engineering, National Technical University Dnipro Polytechnic (NTU “DP”), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

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