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

Table 4

Selection comparison table of λ (according to rib-to-rib displacement convergence).

Items	2	3	4	6	7	10
λ	0.70	0.74	0.75	0.80	0.85	0.87
F	2.27	3.43	13.72	3.01	2.87	2.11
F0.05	4.14	3.25	2.86	2.50	2.39	2.28
F–F0.05	−1.87	0.18	10.86	0.51	0.48	−0.17