Research Article
A Numerical Investigation on the Hydraulic Fracturing Effect of Water Inrush during Tunnel Excavation
Table 1
Numerical simulation parameters.
| | Parameter | Value | Parameter | Value |
| | Compressive strength () | 20 MPa | Homogenization () | 4 | | Tensile strength () | 2 MPa | Elastic modulus () | 10000 MPa | | Self-weight () | | Poisson’s ratio () | 0.25 | | Residual strength factor () | 0.1 | Internal friction angle () | 30 | | Permeability coefficient () | 0.01 m/d | Water pressure () | 3 MPa | | Permeability coefficient jump rate () | 20 | Coupling coefficient () | 0.01 | | Pore water pressure coefficient () | 0.1 | Excavation diameter (d) | 20 mm |
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