[en] The article is devoted to the study of non-drained peat strength in the site of Tungol oil field determined by the core sampling with the help of impeller. The authors present the research results in peat composition, physical, and strength characteristics, changes in properties with depth, revealed relationships between the indicators, the regression equation obtained on their basis for prediction of composition and characteristics. Based on the cluster analysis including all studied indicators the peat classification is performed, three main classes are distinguished, typical values of characteristics as well as recommendations for using peat of every class as construction foundation and corresponding load bearing capacity are given