Table 4 Assessment standard of extreme rainfall climate in cold regions
From: Analysis methodology and assessment indices of vulnerability for asphalt pavement in cold regions
Assessment Index | Micro | Mild | Moderate | Severe | Extreme |
|---|---|---|---|---|---|
Average annual rainstorm days (d) | < 3 | 3 ~ 5 | 5 ~ 9 | 9 ~ 11 | ≥11 |
Pavement drainage capacity | Reasonable pavement drainage system and location of bridges | Reasonable pavement drainage system and location of bridges, bridge aperture deviation ≤10% | Poor pavement drainage system and good location of bridges, bridge aperture deviation between 10%–20% | Poor pavement drainage system and unreasonable location of bridges, bridge aperture deviation between 10%–20% | Inadequate pavement drainage system and deviated location of bridges, bridge aperture deviation> 20% |
Terrain slope (°) | < 8 | 8 ~ 15 | 15 ~ 25 | 25 ~ 35 | ≥35 |
Surface incision depth (m) | < 100 | 100 ~ 300 | 300 ~ 500 | 500 ~ 700 | ≥700 |
Geotechnical types | Hard rock | Medium hard rock | Soft rock | Earth-rock aggregate | Loose oil |