Solution of Strain-Softening Surrounding Rock in Deep Tunnel Incorporating 3D Hoek-Brown Failure Criterion and Flow Rule

Table 3

Plastic radius, critical stresses, and displacements of surrounding rock.

	Softening parameters		/	Associated flow rule; (%)	Nonassociated flow rule; (%)	Nonassociated flow rule; (%)	Nonassociated flow rule; (%)	Nonassociated flow rule; (%)
2D H-B	e-p	1.4591	1		0.6793	0.7245	0.7906	0.8534
		1.4660	1		0.6879	0.7373	0.8114	0.8839
		1.4945	1.2401		0.7239	0.7819	0.8676	0.9500
	e-b-p	1.5091	1.5091		0.7358	0.7947	0.8819	0.9658
3D H-B	e-p	1.2681	1	0.7877	0.5621	0.5815	0.6088	0.6337
		1.2841	1.0372	0.9599	0.5669	0.5884	0.6194	0.6484
		1.2980	1.2198	1.0685	0.5944	0.6219	0.6610	0.6970
	e-b-p	1.3010	1.3010	1.0873	0.6036	0.6314	0.6710	0.7074