Complex Analytical Study of the Stability of Tunnel-Surrounding Rock in a Layered Jointed Rock Mass

Table 4

Modified score parameters of joint obliquity.

Joint inclination	Very advantageous (VA)	Favorable (F)	General (G)	Unfavorable (UF)	Very disadvantageous (VD)
Parameters suggested in this article	0°–15°	75°–90°	20°–30°; 60°–75°	15°–20°; 30°–45°	45°–60°
Score value	0	−2	−5	−10	−12