Selection of Compatible Coal Seam for Methane Drainage Operation Based on Uncertain Geological Conditions: A Hybrid Fuzzy Approach

Table 4

The weights from the FCM method for each criterion.

Criteria	Symbol	Weights from learning algorithm
		Lower limit	Middle limit	Higher limit
Depth of seam	C1	0.4038	0.5053	0.6087
Thickness of seam	C2	0.3132	0.3394	0.3586
Cleats	C3	0.6631	0.6939	0.7281
Uniformity of seam	C4	0.4716	0.4862	0.4921
Gas content	C5	0.6177	0.6521	0.6945
Roof quality	C6	0.3357	0.3764	0.3902
Water condition	C7	0.5033	0.5304	0.6697
Permeability	C8	0.5209	0.5445	0.5706
Methane drainage	C9	-	-	-