METHOD TO DEVELOP CUTOFF CURTAIN Russian patent published in 2015 - IPC E02B3/16 E02D3/12 

FIELD: construction.

SUBSTANCE: method includes erection of a water retaining earth dam 7, placement of a layer of geotextile needle-punched non-woven material 4 from synthetic fibres with volume density of 100-150 kg/m³ and treatment of dam slope with a water soluble powder polymer. After placement of the geotextile material 4 layer it is treated at negative temperature of ambient air by aqueous solution of polyvinyl alcohol and boron compound, for instance, borax or boric acid, with flow rate of 5-10 l/m² at their concentration of 3.0…12.0%, 0.2…1.0% accordingly. Then after freezing of the applied solution the geotextile needle-punched non-woven material 4 is covered with a soil layer 3.

EFFECT: increased reliability of hydraulic insulation of a cutoff curtain under impact of sign-alternating temperatures due to generation of a layer of cryogel composite by a freezing-thawing process, strength and antifiltration properties of which are not deteriorated under multiple impact of freezing-thawing processes.

1 dwg