STONE-EARTH FILL DAM WITH FREEZING UPPER PART Russian patent published in 1997 - IPC

FIELD: construction of dams in severe climatic conditions. SUBSTANCE: dam has core 1 made of cohesive earth, transition zones 2-5, side prisms of rock fill, head part 6 and tail part 7, protective layer 8 above core ridge made of non-cohesive earth. Core side portions 9,10 above boundary 11 of freezing of upper part of dam are made smooth and inclined towards core axis. Adjacent to dam upper part, actually to core upper part are successive polymeric film 12 and filter 13, and adjacent to core lower part are polymeric film 14 and filter 15. Bottom part of film 12 and of filters 13 and 15 is located below boundary 16 of expected loosening of core seasonal thawing. Film 14 is located within limits of freezing upper part of dam. Films 12 and 14 and/or filters 13 and 15 are made of current-conducting polymeric matter. . . and are provided with electrodes 18.19. Films 12,14 at core side are coated with layer of lubricant. EFFECT: high efficiency. 2 cl, 2 dwg