tienpohjaa
Tienpohja, or road foundation, refers to the lower load-bearing layer of a road structure. It is formed from the compacted natural soil or from stabilized fill, and it serves to distribute traffic loads to the underlying ground, while providing stability and resistance to frost and moisture effects. The tienpohja acts as the foundation for the upper layers of the road, and its properties influence the overall bearing capacity, settlement, and durability of the pavement.
Materials and methods vary with local conditions. In many cases tienpohja consists of compacted natural soil
Design and testing practices aim to ensure adequate bearing capacity, frost protection, and long-term performance. Common
Maintenance of tienpohja focuses on preventing excessive settlements and moisture-related deterioration. Drainage improvements, re-compaction, or stabilization