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

Table 4

Calculation parameters.

Rock mass			a
1	0.0039	0.0039	0.55	0.6	1.7	1.7
2	0.0039	0.0019	0.55	0.55	1.7	1.7
3	0.0039	0.0039	0.55	0.55	1.7	1.6
4	0.0039	0.0039	0.55	0.55	1.7	0.85