E 18 near Sunsmyra NORWAY – 1987/88
Problem Low load-bearing subsoil; Increase of the road height by 2.5 m to protect against flooding –› buoyancy resistant solution required.
Cubic Area: 5,000 m3. Load: No data.
Composition Road bed 60 cm total thickness. Base Non-woven textile covering; Leca®, in 3 layers, total thickness 2.5 m; Geotextile as separating membrane; Pre-loading with 1.5 m crushed rock. Subsoil 4-5 m peat; 10 m cohesive soils with soft consistency; Load-bearing rock at depth of 15-18 m; Naturally high water levels (buoyancy problem).
Building method 1. Removal of a thin layer of peat; 2. Application of the 3 Leca® layers on geotextile; 3. Compaction; 4. Non-woven textile covering; 5. Application of pre-load of 1.5 m crushed rock; 6. Removal of the rock layer after 16 months (50 cm settlement); 7. Construction of the road superstructure.
Construction Leca®
High water mark 34.50 m
Cross-section Sundsmyra
Roads (01-015-A)
01-015-A – pag 2/2
Quality control Settlement measurements: –› settlements under pre-load of up to 50 cm
Performance Measurements Settlement measurements: –› less than the forecast: 9 cm over the first three years.
Settlement in cm
Theoretical settlement curve Section 5240
Section 5280
Settlement Diagram: Sundsmyra.
Flaws/damage Type: no data. Time: -Maintenance work No data.
Appraisal/Experiences Successful load reduction.
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