Research Article
A Dynamic Risk Assessment Method for Deep-Buried Tunnels Based on a Bayesian Network
Table 4
Risk rating factors grading criteria.
| | Factors | Grading |
| Objective factors | Section size | Medium | | Large | Construction method | Center diagram (CD) method | Bench cut method (BCM) | Ring cut method (RCM) | Full face excavation method (FFEM) | Center cross diagram (CRD) method | Tunnel depth | <15 m | 15~25 m | >25 m | Surrounding rock level | IV | V | VI | Groundwater | No water | Water leaking | Water gushing | Mud inrush | No mud | Mud leaking | Mud inrush | Subjective factors | Prereinforcement effects | Good | Medium | Poor | Support timing | In time | | Late | Construction quality | Good | Medium | Poor | Construction experience | Well experienced | Medium | Inexperienced | Construction management | Strict | Medium | Poor | Support strength | High | Medium | Low | Monitoring factors | Inner-tunnel observation | Normal | Slight cracks | Slip off | Arch crown convergence | III | II | I | Side wall displacement | III | II | I |
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