noun
- the prepared foundation layer of soil or other material beneath a road, railway, or other construction
Usage: engineering; construction
Examples
- The engineers tested the subgrades before laying the asphalt.
- Poor subgrades can cause roads to crack and deteriorate quickly.
- The construction crew compacted the subgrades to ensure stability.
- Different soil types require different subgrade preparation methods.
- The railway project required extensive work on the subgrades.
- Heavy rainfall can weaken subgrades if drainage is inadequate.