Research Article
Comprehensive Analysis of Stability of Coal Seam Composite Roof Based on Analytic Hierarchy Process
Table 7
Classification table based on the comprehensive influence coefficient of the composite roof structure.
| Factor | Rank | Comprehensive strength coefficient | Strata characteristics | Bending strength (MPa) |
| qk | I | 0.7 < k < 1 | Stable | 6.53–10.48 | II | 0.4 < k < 0.7 | Slightly stable | 3.86–6.53 | III | 0 < k < 0.4 | Unstable | 0.00–3.86 |
|
|