The article is devoted to identify the causes of specific behavior argillit-like clay clays Sochi suites at bid opening and interaction with water. The article outlines the history of rock formation, from the deposition of the primary clay material on the bottom of the sedimentation basin to convert it into a highly lithified argillaceous rocks, generating mechanism contacts between the clay particles and the type of contacts formed.

Keywords: Argillit-like clay, engineering geology, catagenesis, construction, swelling, the density of the soil, cutting the road