Mining of Mineral Deposits

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Mathematical modeling of unsteady water filtration into anchored mine opening

O. Krukovskyi1, V. Krukovska2, Yu. Vynohradov3

1Institute of Geotechnical Mechanics named after M.S. Polyakov of the National Academy of Sciences of Ukraine, Dnipro, Ukraine

2Department of Dynamic Phenomena Management of Rock Pressure, Institute of Geotechnical Mechanics named after M.S. Polyakov of the National Academy of Sciences of Ukraine, Dnipro, Ukraine

3Department for Physics of Sorption Processes, Institute for Physics of Mining Processes of the National Academy of Sciences of Ukraine, Dnipro, Ukraine


Min. miner. depos. 2017, 11(2):21-27


https://doi.org/10.15407/mining11.02.021

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      ABSTRACT

      Purpose. To develop a mathematical model of the interrelated processes of coal-rock mass deformation and water filtration in the disturbed area to study the change in the value of water inflow into the mine working de-pending on the method of its supporting.

      Methods. In this research, we used methods of rigid body mechanics, fluid and gas mechanics as well as numerical simulation based on the finite element method.

      Findings. A mathematical model of water filtration in the deformed rock mass was developed. It is shown that the use of bolting prevents fracturing process in the zone subjected to the influence of the mine working. In this case, solidity of the virgin mass in the roof is maximally preserved. Significant reduction of the filtra-tion area and decrease in its permeability leads to the drop in intensity of the liquid filtration movement and prevents or reduces water inflow into the mine workings with anchor support.

      Originality. Bolting is considered as a technological method of reducing water inflow into mine workings for the first time. Based on the results obtained, the “Method for Reducing Water Inflow into the Mine Workings with the Roof Bolting” was developed. Effectiveness of this method was proved in the coal mines of the Western Donbas.

      Practical implications. The calculations show that bolting can simultaneously perform two functions: ensuring stability of the mine working and its waterproofing, which significantly reduces the operating costs.

      Keywords: deformation of the coal-rock mass, permeability, water filtration, numerical simulation


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