Results of research on the stability of mine workings, fixed by arched supports made of composite materials, in the conditions of the Pokrovske Mine Administration

Abstract

The paper provides a detailed analysis of innovative technologies for maintaining mine workings at great depths. The possibility of using composite materials (in particular, carbonfiber-reinforced plastic) as fastening elements is of special attention. It has been conducted a comparative analysis of the physical-mechanical properties of carbon fiber-reinforced plastic and low-alloy steel, traditionally used for the manufacture of frame support. To conduct a comparative analysis of the stress-strain state, a series of models has been developed and computer modelling has been performed by the finite element method using the Ansys Mechanical software product. In mining-geological conditions Pokrovske Mine Administration, three types of supports, namely, basic, composite with variable section and composite with constant section, have been studied. The initial and boundary conditions, as well as the assumptions and idealization of the model, have been substantiated. A comparative analysis of the stress intensity confirms the advantage of the proposed frame supports made of composite materials in terms of limiting the zones with maximum values. Laboratory research, conducted on a 3D-printer, testifies to the adequacy of conducted modelling. The reliability of the obtained values makes it possible to recommend an innovative support using carbon fiber-reinforced plastic for conducting a mine experiment.

Increasing the underground coal gasification efficiency using preliminary electromagnetic coal mass heating

“…where O2 and CO is oxygen and carbon monoxide concentrations, kg/m 3 ; V is filtration velocity in the channel, m/s; η is oxygen diffusion coefficient; z is a coordinate, which is counted along the channel, m; k is the carbon monoxide-oxygen reaction rate constant; r is channel radius, m. Solving differential equations yields the distribution of oxygen and carbon monoxide concentration along the channel length: 22…”

“…Investing in research into new technologies and mining methods could pave the way for a more sustainable future. Thus, the coal industry remains important to the global economy, but its future requires serious efforts to preserve the environment, social stability and efficient use of resources [21], [22]. The coal industry, as an important sector of the global economy, is currently facing two key challenges.…”