Implementation of the Barton–Bandis Nonlinear Strength Criterion into Mohr–Coulomb Sliding Failure Model

Table 1

Shear strength parameters and fitting relationship of the structural plane.

Normal stress, (MPa)	Peak shear strength, (MPa)	Initial shear rigidity,		Asymptotic value of the hyperbolic curve, (MPa)
0.050	0.070	0.50		0.073
0.100	0.082	0.63		0.098
0.150	0.110	0.74		0.113
0.200	0.130	1.04		0.146
Relation fitting curve	Fitting formula	Determination of parameter		Correlation coefficient
		a	b
Linear relationship		0.2394	−0.0095	0.9733
relationship ()		2.0547	0.4881	0.9091
Linear relationship ()		1.0812	0.0014	0.9368
Linear relationship ()		0.4170	0.0458	0.9773