Abstract
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. When solving the problem, the finite element method was used. The calculation results of the displacements, stresses and pressures of methane in the studied area are represented 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.
Highlights
The analysis of the deep Donbas mines work shows that a significant part of the preparatory mine workings is in unsatisfactory state caused by the intensive bottom rocks swelling [1]
The coupled processes of the rock massif deformation and gas filtration in a disturbed area are described by a system of equations [7,8,9]: cg
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
Summary
The analysis of the deep Donbas mines work shows that a significant part of the preparatory mine workings is in unsatisfactory state caused by the intensive bottom rocks swelling [1]. The mechanism of deforming the strong rock layers is in the elastic bending into the cavity of mine working with the subsequent fault and the formation of a longitudinal fracture along the mine working. The growth of fractures is the main factor leading to the deformation and destruction of the rock massif around the mine working. If the fractures which are formed in the bottom reach the gas-bearing strata, a breakthrough of methane occurs into mine working, which leads to an excessive gasification of the mine environment, miners’ injury, and an increase in the cost for maintaining the mine working
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