Freeze-Thaw Effects on Stability of Open Pit Slope in High-Altitude and Cold Regions

Table 8

Strength parameters of rock mass on No. 4 minefield slope under freeze-thaw environment.

Lithology	Internal friction angle φ (°)		Cohesion (MPa)		Poisson ratio	Deformation modulus (GPa)	Unit weight (kN/m^3)
	Improved Hoek-Brown criterion	RocLab	Improved Hoek-Brown criterion	RocLab
Coarse sandstone	44.5	37.8	0.412	0.669	0.17	5.25	26.89
Fine sandstone	49.9	42.1	0.259	0.436	0.20	4.89	26.39
Muddy siltstone	36.9	22.8	0.249	0.270	0.19	2.66	26.59