Research on Key Factors Influencing Surface Subsidence of Paste Backfilling Mining in Thick Coal Seam of Deep Mine

Table 5

Evaluation guidelines.

Stability grades	Membership degree	Meaning of each grade
I	0.8∼1.0	Good stability
II	0.6∼0.8	Fairly good stability
III	0.4∼0.6	General stability
IV	0.2∼0.4	Relatively poor stability
V	0∼0.2	Poor stability