GROUND DAM BUILT ON PERMAFROST BASE Russian patent published in 2007 - IPC E02B7/06 

FIELD: hydraulic structures, particularly earth-fill and rock-fill dams.

SUBSTANCE: dam comprises central part extending from base to top thereof and made of fine ground, as well as upstream and downstream side shells and vertical impervious barrier. The impervious barrier is arranged in central dam part and is formed of intersecting bored piles along the full central part height. The bored piles are submersed in base for predetermined depth and made of plastic clay-concrete. Ice-and-ground frozen curtain adjoins impervious barrier from downstream side thereof. The frozen curtain is made with the use of freezing columns and is connected to impervious barrier by freezing thereof to the barrier. Freezing column bottom is below that of the nearest bored piles. Impervious barrier may be covered with consistent layer of fine ground in which mud solution is injected from upstream side thereof and with ground-and-concrete layer formed by clay-cement mix injection in fine ground and arranged from downstream barrier side.

EFFECT: increased stability and reliability of frozen dam operation.

7 cl, 3 dwg, 2 ex