The Plastic Zone of Tunnel Surrounding Rock under Unequal Stress in Two Directions Based on the Unified Strength Theory

Table 1

The calculation parameters of the tunnel.

r0 (m)	E (GPa)		p0 (MPa)	ps (MPa)	φ (°)	c (MPa)	λ
3	10	0.25	8	0.4	40	1.0	0.6