Stability Charts for Pseudostatic Stability Analysis of Rock Slopes Using the Nonlinear Hoek–Brown Strength Reduction Technique

Table 2

Comparison of the FOS for a given rock slope with various HB parameters.

Input parameters			FOS
	GSI	mi	Group 1	Group 2	Group 3
β = 45°; kh = 0.1; SR = 40
	10	5	1.2	1.2	1.2
	10	15	1.71	1.71	1.71
	10	25	2.01	2.01	2.03
	10	35	2.23	2.23	2.24
	50	5	4.5	4.51	4.52
	50	15	4.52	4.53	4.53
	50	25	4.7	4.69	4.7
	50	35	4.89	4.88	4.89
	100	5	46.2	46.21	4.19
	100	15	35.25	35.26	35.25
	100	25	30.81	30.79	30.81
	100	35	27	27.02	26.99