An Improved Approach of Classical Upper Bound Theory for Stability Analysis of Layered Slopes

Table 2

Comparison of N_s between researchers and the presented for layered slopes with of 20° (Example 1).

m	Source
		45°	50°	55°	60°	65°	70°	75°	80°
0.2	Kumar and Samui [20]	15.69	13.60	11.86	10.30	8.95	7.89	7.06	6.32
	Sun et al. [21]	―	13.51	11.72	10.30	9.22	8.29	7.46	6.77
	Present	15.61	13.51	11.73	10.33	9.23	8.30	7.49	6.78
0.4	Kumar and Samui [20]	13.86	12.10	10.78	9.47	8.5	7.55	6.06	5.56
	Sun et al. [21]	―	12.84	11.21	9.94	8.91	7.29	6.61	5.81
	Present	15.06	12.85	11.22	9.96	8.92	8.36	7.30	6.62
	Geo-Slope (Morgenstern–Price)	15.31	―	―	―	―	8.30	7.51	6.80
0.6	Kumar and Samui [20]	13.26	11.78	10.48	9.22	8.25	7.31	6.6	5.95
	Sun et al. [21]	―	11.70	10.63	9.24	8.35	7.59	6.91	6.31
	Present	13.53	11.72	10.34	9.26	8.36	7.59	6.92	6.31