Restriction of salt rock as subgrade filling in railway construction
| Subgrade layer | High-speed railway and intercity railway | Heavy haul railway, and ≥160 km/h mixed passenger & freight railway | <160 km/h mixed passenger & freight railway |
|---|---|---|---|
| Upper layer of subgrade bed | Not allowed | Not allowed | Not allowed |
| Bottom layer of subgrade bed | Not allowed | Not allowed | Allowed |
| Below the subgrade bed | Not allowed | Allowed | Allowed |
| Subgrade layer | High-speed railway and intercity railway | Heavy haul railway, and ≥160 km/h mixed passenger & freight railway | <160 km/h mixed passenger & freight railway |
|---|---|---|---|
| Upper layer of subgrade bed | Not allowed | Not allowed | Not allowed |
| Bottom layer of subgrade bed | Not allowed | Not allowed | Allowed |
| Below the subgrade bed | Not allowed | Allowed | Allowed |
Note(s): After National Railway Administration of the People's Republic of China (2018)
Source(s): Authors’ own work
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