Reasons and mechanism for soil sliding processes in the Rebrnice area, Vipava valley, SW Slovenia

A motorway Razdrto-Podnanos is being built across Rebrnice area in Vipava valley. There is limestone scree material deposed on flysch rocks. Limestone scree is unstable and gradually slides downslopes because of slope inclination, underground water and clayey zones. Clayey zones have been created on the contact between scree and flysch rocks. Material movements can be observed on the surface but they were also measured in wells. Limestone scree composition and reasons for landslides were described in this article.