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

Table 1

Coefficients affecting the compressive strength of the roof rock.

Rock type
Sandstone	0.33	0.7	0.6
Limestone	0.42	0.6	0.4
Limestone and Claystone	0.5	0.6	0.4