Table 2.

Reduction factor settings.

Reduction factor	Cohesion (KPa)	Internal friction angle (°)
0.5	55.6	19.42540014
0.75	37.06666667	13.23012418
1	27.8	10
1.25	22.24	8.029256754
1.5	18.53333333	6.70442623
1.75	15.88571429	5.753605682
2	13.9	5.038368773
2.25	12.35555556	4.480971414
2.5	11.12	4.034435684
3	9.266666667	3.363727412