EARTH DAM OF FROZEN TYPE Russian patent published in 1995 - IPC

FIELD: hydraulic engineering. SUBSTANCE: earth dam of frozen type has impervious core of low-permeable coherent earth, upper-stream and downstream rockfill, intermediate layer between core and upstream and downstream rockfills and frozen curtain. Dam has additional low-permeable earthfill with height equalling at least depth of seasonal thawing of earth made along foot downstream slope from ridge of which columns of frozen curtain are installed and cover of coherent earth located under downstream rockfill. Intermediate layer and downstream rockfill are of minimal thickness. EFFECT: higher efficiency. 2 dwg