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

Table 1

The stability coefficients N_s of Chen [8] and Sun et al. [21] and this work.

(°)	Source	°
		15°	25°	35°	45°	55°	65°	75°
5°	Chen [8]	14.38	10.02	8.41	7.35	6.53	5.81	5.14
	Sun et al. [21]	14.30	9.99	8.38	7.33	6.53	5.79	5.12
	Present	14.37	10.12	8.41	7.35	6.53	5.81	5.14
10°	Chen [8]	45.49	16.64	11.61	9.31	7.84	6.73	5.80
	Sun et al. [21]	44.99	16.57	11.61	9.29	7.83	6.72	5.80
	Present	45.49	16.64	11.61	9.31	7.84	6.73	5.80
15°	Chen [8]	—	32.11	16.83	12.05	9.54	7.85	6.57
	Sun et al. [21]	—	31.96	16.78	12.04	9.53	7.84	6.56
	Present		32.11	16.83	12.05	9.54	7.85	6.57
20°	Chen [8]	—	94.63	26.66	16.16	11.80	9.25	7.48
	Sun et al. [21]	—	93.74	26.58	16.14	11.78	9.24	7.49
	Present		94.63	26.66	16.16	11.80	9.25	7.48