Research Article
Selection of Compatible Coal Seam for Methane Drainage Operation Based on Uncertain Geological Conditions: A Hybrid Fuzzy Approach
Table 7
The presented functions for the evaluation of the MDA of coal seams.
| | Qualitative class | Thickness of seam | Depth of seam |
| | Very poor | | | | Poor | | | | Moderate | | | | Good | | | | Very good | | |
| | Qualitative class | Uniformity of seam | Cleats | | Very poor | | | | Poor | | | | Moderate | | | | Good | | | | Very good | | | | Qualitative class | Gas content | Underground water condition | | Very poor | | | | Poor | | | | Moderate | | | | Good | | | | Very good | | |
| | Qualitative class | Roof quality | Permeability | | Very poor | | | | Poor | | | | Moderate | | | | Good | | | | Very good | | |
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