Krukovska V.V., Krukovskyi O.P., Kocherga V.M., Kostrytsia A.O. Solving coupled problems of geomechanics and gas filtration for mining safety ensuring

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Parent Category: Geo-Technical Mechanics, 2022

Category: Geo-Technical Mechanics, 2022, № 160

Geoteh. meh. 2022, 160, 106-122

https://doi.org/10.15407/geotm2022.160.106

 

SOLVING COUPLED PROBLEMS OF GEOMECHANICS AND GAS FILTRATION FOR MINING SAFETY ENSURING

¹Krukovska V.V., ¹Krukovskyi O.P., ¹Kocherga V.M., ¹Kostrytsia A.O.

¹Institute of Geotechnical Mechanics named by N.Poljakov of National Academy of Sciences of Ukraine 

UDC 622.267.5

Language: English

Abstract. Some features of combined progress for the coupled processes of coal bed deformation and gas filtration are considered in the study, the mathematical model is developed taking into account the mutual influence of these processes. Simulation flowcharts for the following tasks related to the safety of mining operations in coal mines are presented: methane filtration into the mine working, which is arranged in a gas-bearing coal bed; filtration flows motion in the presence of methane drainage boreholes as well as and protective structures used within a gateroad; influence of water in the fracture-pore space of coal on the origin of gasdynamic phenomena; dependence of unloading of gas-bearing outburst prone sandstones on rock pressure within the zone of the working face influence.
Calculations show that a zone of increased fracture spreads around the mine working over time. At the same time, the filtration area grows, within which methane can move from methane sources (gas-bearing coal seams and sandstones) to the mine working space. Therefore, the filtration area covers more distant sources of methane release over time. Simulation of drainage boreholes performance in the deformed gas-bearing rocks makes it possible to study the influence of factors such as stoping of a gateroad and the use of protective structures on stability of the boreholes and their efficiency. The calculation results show the following features. In case of underworking of methane drainage boreholes they get broken and stall their performance, if no protective structures are involved. If the protective structures are used, the rock-bolting beam within the underworking space gets sustained. Methane drainage boreholes span beyond the zones of inelastic deformations and remain in operating conditions even after their undermining by means of a working face. Taking into consideration tectonic fault as well as change of the physical and mechanical properties of coal within the perturbed zone provides an opportunity to study behavior of the coupled processes for geomechanics and filtration that occur during mining operations over outburst prone coal seams. Taking into account the influence of water on the change of physical and mechanical properties of coal as well as the formation of the phase permeability field for gas, the influence of moisture on the origin of gasdynamic processes could be studied.
The paper shows that solving complex problems related to gas and outburst safety of mining operations in coal mines requires the use of numerical simulation methods for coupled physical processes. In some cases, the calculation error reaches out large values if the mutual influence of the processes occurring in the rock is neglected.
Keywords: mining safety, coal and methane outburst, rock deformation, coupled processes, methane emission, numerical simulation.

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About authors:

Krukovska Viktoriia Viktorivna, Doctor of Technical Sciences (D.Sc.), Senior Researcher, Senior Researcher in Department of Pressure Dynamics Control in Rocks, 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.

Krukovskyi Oleksandr Petrovych, Corresponding Member of NAS of Ukraine, Doctor of Technical Sciences (D.Sc.), Deputy Director of the institute, 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.

KochergaViktor Mykolaiovych, Candidate of Technical Sciences (Ph.D.), Сhief Technologist in Department of Pressure Dynamics Control in Rocks, 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.

Kostrytsia Andrii Oleksiiovych, Postgraduate Student, 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.

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