The need to study changes in the composition and properties of the city in the area of placement of tailing dumps of PA Phosphorite is associated with the problem of temporary prediction of the stability of the base and slopes of these structures, the operation of which has been carried out since 1963.

Ensuring the stability of containment dams, slopes and the body of tailings dams is impossible without predicting the change in the strength characteristics of the clayey rocks of their base in time.