Building a solid slope in Northern Italy
Geogrid and drainage composite from TenCate Geosynthetics form the basis for a new slope which carries a dual carriageway in northern Italy: a solution with minimal impact on the environment.
Oggiogno is a small village in the hills above Lago Maggiore, fifteen kilometres to the south of the Italian-Swiss border. The provincial road that links this village to other towns and villages was destroyed in 2012 after a period of very heavy rainfall.
In order to preserve this beautiful, green environment as far as possible, standard solutions with concrete walls were considered unacceptable. For this reason the decision was taken to construct a safe slope reinforced with geosynthetics. Construction work began in February 2013 and, despite the abysmal spring weather, the slope was completed by the end of June.
Following this, the building contractor was able to start building a new dual carriageway on top of the slope. The new mountain wall is 13.6 metres high and has an angle of inclination of 65° and a surface area of 1,300 m2. TenCate Miragrid® GX was the material chosen for reinforcement of the slope.
To ensure rapid drainage of rainwater, the drainage composite TenCate Polyfelt® Megadrain was installed behind the slope, since lack of good drainage was part of the cause of the landslide last year. The chosen solution had an added advantage: no large quantities of building materials or construction machinery had to be brought in from elsewhere. In this way, despite the small and difficult area of operations, it was possible to continue working full steam ahead. As regards transport, the carbon footprint produced was modest.
The provincial road will shortly be reopened to traffic. The slope has been stabilized and seeded and will soon be entirely covered in greenery as before.