Research Article
Intelligent Recognition of Safety Risk in Metro Engineering Construction Based on BP Neural Network
Table 3
Classification criteria for risk level S.
| Grade | Valuation S | Meaning description |
| Level 1 | 0.8–1.0 | The highest level of risk, which may cause devastating disasters and heavy casualties | Level 2 | 0.6–0.8 | The level of risk is very high, causing widespread damage or casualties | Level 3 | 0.4–0.6 | The risk level is relatively high, which may cause damage within a certain range | Level 4 | 0.2–0.4 | The risk level is low, and appropriate preventive measures can be taken | Level 5 | 0–0.2 | The lowest level of risk, almost no risk |
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