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Investigating the effect of fractures on unusual gas emission in coal mines; case study of Parvadeh coal mine, Iran

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Figure

Figure 1. The location of Parvadeh coal mine and the target tunnel (Named Slope-1).
Figure 2 and Figure 3. Gas concentration fluctuations is presented in graphs related to the mining activities and the time of excavating the
Figure 4. Methane gas concentration variations in a period of two months from
Figure 5. Factors that contribute to the occurrence of unusual gas emissions/gas outbursts and rockbursts in coalmines (modified after [3])

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