Krukovskyi O.P., Krukovska V.V. Numerical simulation of the stress state of the layered gas-bearing rocks in the bottom of mine working

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Parent Category: Geo-Technical Mechanics, 2019

Category: Geo-Technical Mechanics, 2019, Issue 146

Geoteh. meh. 2019, 146, 41-49

https://doi.org/10.1051/e3sconf/201910900043

NUMERICAL SIMULATION OF THE STRESS STATE OF THE LAYERED GAS-BEARING ROCKS IN THE BOTTOM OF MINE WORKING

¹Krukovskyi O.P., ¹Krukovska V.V.

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

UDC 622.411.332:622.83                                  

Language: English

Abstract.

. An analysis of the state of mine workings of the deep mines of Donbass shows that a significant part of them are in unsatisfactory condition due to intense heaving of floor rocks. If there are one or more layers of strong rocks on the more pliable rocks, then sudden destruction of working floor can occur. Cracks that form in the floor can reach gas-bearing rocks and coal seams. Then there is a breakthrough of methane into the mine, which leads to the gasification of the mine atmosphere, injuries to miners, increasing the cost of maintaining the mine. To prevent such negative consequences it is necessary to study the coupled processes of deformation of the layered gas-bearing rocks and methane filtration. The aim of the work is to numerically simulate the rocks stress state around a mine, provided that strong and pliable gas-bearing rocks alternate in its floor.  The mathematical model has been developed for the coupled processes of the rock massif deformation and gas filtration in a disturbed area around mine working, in the bottom of which there are hard and soft gas-bearing rocks. At each time iteration, the influence of the stress field on the formation of the filtration area, the influence of change in gas pressure on the stress state of rocks are taken into account. The finite element method was used to solve the problem. There are calculation results of the displacements, stresses and pressures of methane in the studied area in the paper. It is shown that the difference in the physical and mechanical properties of the bottom rocks of mine working causes the non-uniform distribution of geomechanics and filtration parameters. In more strong sandstone, the stresses concentration increases. Therewith, an intensive process of fractures formation takes place in the argillite and the coal. Methane from the upper part of the gas-bearing sandstone is filtered into the mine working; the destruction of the coal interlayer is accompanied by release of methane and its accumulation under the layer of a strong sandstone. The development of a zone of inelastic deformations leads to the destruction of sandstone. In case of brittle destruction, with the formation of fractures of a certain length, a breakthrough of methane may occur out of the bottom into mine working.

Keywords: deformation of the rocks, stress state of the rocks, coupled processes, gas filtration, brittle destruction.

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About the authors

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 N. Poljakov of National Academy of Science of Ukraine (IGTM, NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Krukovska Viktoria Viktorivna, Doctor of Technical Sciences (D. Sc), Senior Researcher, Senior Researcher in the Department of Control of Dynamic Demonstrations of Rock Pressure, Institute of Geotechnical Mechanics named N. Poljakov of National Academy of Science 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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