Table 4. Calibrated parameters for the... | Emerald Publishing

Table 4.

Calibrated parameters for the Lode-dependent strength criterion, based on Sheng et al. (2000) and Gajo & Muir Wood (1999)

Parameters	CoT	CoP
Dominant mineralogy	Tectosilicates (quartz and feldspar)	Phyllosilicates (biotite and chlorite)
Critical state stress ratio for triaxial compression, M_tc	1·46	1·40
Critical state stress ratio for simple shear, M_ss	1·02	0·99
M_ss/M_tc	0·70	0·71
M(θ) equation (Sheng et al., 2000)	$M (θ) = 1·046 * {[\frac{0 \cdot 270}{1 \cdot 135 - 0 \cdot 865 \times \sin (3 θ)}]}^{\frac{1}{4}}$	$M (θ) = 1 \cdot 40 * {[\frac{0 \cdot 286}{1 \cdot 143 - 0 \cdot 857 \times \sin (3 θ)}]}^{\frac{1}{4}}$
Predicted critical state stress ratio for triaxial extension, M_te	0·88	0·86
Critical state friction angle for triaxial compression, ϕ′_tc	36·0°	34·6°
Critical state friction angle for simple shear, ϕ′_ss	36·1°	34·8°

Parameters	CoT	CoP
Dominant mineralogy	Tectosilicates (quartz and feldspar)	Phyllosilicates (biotite and chlorite)
Critical state stress ratio for triaxial compression, M_tc	1·46	1·40
Critical state stress ratio for simple shear, M_ss	1·02	0·99
M_ss/M_tc	0·70	0·71
M(θ) equation (Sheng et al., 2000)	$M (θ) = 1·046 * {[\frac{0 \cdot 270}{1 \cdot 135 - 0 \cdot 865 \times \sin (3 θ)}]}^{\frac{1}{4}}$	$M (θ) = 1 \cdot 40 * {[\frac{0 \cdot 286}{1 \cdot 143 - 0 \cdot 857 \times \sin (3 θ)}]}^{\frac{1}{4}}$
Predicted critical state stress ratio for triaxial extension, M_te	0·88	0·86
Critical state friction angle for triaxial compression, ϕ′_tc	36·0°	34·6°
Critical state friction angle for simple shear, ϕ′_ss	36·1°	34·8°