Water Inrush Mechanism in Fault Fracture Zone Based on a Nonlinear Mechanical Model of Three Flow Fields

Table 1

The hydrodynamic parameters in three stages.

Flow field parameters	Aquifer	Fault zone	Inside the tunnel
Density	1000	1000	1000
Power viscosity	0.001	0.001	0.001
Porosity of rock layer	0.14	0.348	—
Penetration rate			—
Non-Darcy factor	—	Equation (5)	—
Initial pressure	4.1	—	0.1