SOIL NON-HOMOGENUOUS FILL DAM Russian patent published in 2009 - IPC E02B7/06 

FIELD: hydraulic engineering construction.

SUBSTANCE: invention refers to hydraulic engineering construction of soil non-homogeneous fill dams. In cross section the dam consists of a transitive zone crossing the body of the dam by height and of the zone separating part of the dam body out of fine grain sand from the part of the dam body out of large-sized soil. The transitive zone is made of two layers out of soil of specified grain composition in form of a two-layer gabion wall out of tied gabions. The basket of each gabion is of a box shape, is made out of wire mesh and is divided into cells with one or more diaphragms. Certain cells are filled with soil of the first transitive layer and form the first layer of the gabion wall, while other sells are filled with soil of the second transitive layer and form the second layer of the gabion wall. Soil of at least the first transitive layer in the cell of the basket is enclosed in a flexible shell; while a dividing layer out of geo-synthetic material is made between a gabion wall and fine grain of the dam body. The flexible shell is made out of geo-textile canvas and has a box shape; the dimensions of the shell are at least equal to dimensions of the basket cell and facilitate tight fit of enclosed in the basket soil to the wire mesh of the cell. The dividing layer is made in form of a counter-suffosion element out of water-proof fibre material, mainly of geo-textile canvas and/or mineral-fibre plates, calculated diametre of water conducting holes of which is limited with mathematic dependence. The dividing layer can be made in form of a counter-filter element containing a water-proof membrane.

EFFECT: invention decreases volume of soil of transitive layer and enhances dam reliability.

4 cl, 9 dwg, 2 ex