Surrounding Rock Stability Classification Method of Coal Roadway Based on In Situ Stress

Table 3

Selection comparison table of λ (according to roof-to-floor convergence).

Items	2	3	4	5	6	7	12
λ	0.65	0.70	0.75	0.77	0.80	0.85	0.89
F	3.89	2.99	3.79	2.87	3.18	2.86	2.70
F0.05	4.14	3.25	2.86	2.67	2.50	2.39	2.25
F–F0.05	−0.26	−0.25	0.93	0.20	0.68	0.47	0.45