Abstract
Climate change can make an impact on the mining sector and post-mining sites. Among others, extreme weather events are connected with sudden and deep pressure drops which lead to gas emissions from an underground space to the surface through closed shafts. The tests undertaken in the frameworks of TEXMIN project lead to get measuring data of this phenomenon and will allow validating numerical models for further forecasts and mitigation means. Three examples of the results were presented. They showed that the intensity of pressure drop influences strongly on gas emissions from a closed shaft. Although the pressure drop process should be investigated in detail considering hourly or even more frequent variations of pressure. Considering the variation of emitted gases in the vicinity of the closed shaft they remained increased even 20 – 30 m from the point of emissions.
Highlights
Mining is a sector exposed to climate change
The concentration of CO2 in emitted gases decreased from 2.37% vol to background value (0.056% vol.) and the oxygen concentration increased from 18.4% vol to 20.9% vol (Figs. 10 and 11)
The change in the intensity of emission influenced on the gas emissions rate and the change in oxygen concentration
Summary
Mining is a sector exposed to climate change. Changing climatic conditions will influence both, operating and closed mines. It should be emphasized here that the article is referred to one of the possible cases of gas emissions from closed mines - through the decommissioned shaft It is when there is hydraulic flow of gases through a shaft which is not filled with backfilling material. It was assumed that the pressure difference at the outlet of the opening from the reservoir is caused by a decreasing barometric tendency In this model, a constant density of the mixture was assumed, gas expansion, gas viscosity and process isothermal nature were omitted. The gas flows under pressure towards the surface through all available gaps They can be fault gaps, cracks, gaps in porous material filling closed workings and holes [17,18]. This article presents the first step of the research e the measurements, by three different examples
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