Research Article
Research on the Safety Thickness of Tunnel Outburst Prevention in Water-Rich Fault Fracture Zone Based on Janssen’s Theory
Table 1
Mechanical parameters of surrounding rock and support structure.
| | Parameter | Ordinary surrounding rock | Fault zone surrounding rock | Initial support | Secondary lining |
| | Weight (kN/m3) | 24 | 21.5 | 25 | 26 | | Elastic modulus (GPa) | 20 | 5 | 26 | 28 | | Poisson’s ratio | 0.28 | 0.32 | 0.2 | 0.2 | | Cohesion (MPa) | 1.5 | 0.6 | — | — | | Internal friction angle (°) | 48 | 30 | — | — | | Permeability coefficient (m/s) | | | | |
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