In areas where the subsoil consists of clay, the terrain is often strongly characterized by gullies. Steep slopes have been formed down towards rivers and as a result of old landslides. Between the slopes there are often lowland of varying size. Road construction in such areas often leads to high embankments across valleys and deep cuttings in valley slopes. It is a geotechical challenge to prevent landslides and settlements in connection with road construction on clayey soil. The main embankments are constructed using suitable clay from the cuts, while inferior cut materials are used in counterfills or dump pits. The road authorities often takes the initiativ to cooperate with the landowners, so that the road planning can be coordinated with a prefered ground levelling of areas in connection with the road project. Topographic adjustments to areas next to the road can therefore be performed in a satisfactory manner for all parts, also providing environmental improvements, often combined with embankments used as noise barriers if required.
Abstract