A New Unified Solution for Deep Tunnels in Water-Rich Areas considering Pore Water Pressure

Table 1

Geometrical and mechanical parameters.

Parameters	Values
Radius of the tunnel, (m)	3
Initial stress, (MPa)	16.2
Support pressure, (MPa)	0
Lateral stress coefficient	1.5
Pore water pressure, (MPa)	5
Pore water pressure coefficient,	1
	12
Poisson’s ratio,	0.25
Young’s modulus, (MPa)	2400
Initial cohesion, (MPa)	3.5
Residual cohesion, (MPa)	1.5
Dilation angle, (°)	10