Research Article

Groundwater Inrush Control and Parameters Optimization of Curtain Grouting Reinforcement for the Jingzhai Tunnel

Table 3

Pore permeability parameters.

Permeability coefficient in carbonaceous slate
Permeability coefficient in grouting zone
Porosity in carbonaceous slate0.33
Porosity in grouting zone0.15
Coefficient4.2 m-1