GROUND DAM ON PERMAFROST SOILS Russian patent published in 2011 - IPC E02B7/06 

FIELD: construction.

SUBSTANCE: ground dam comprises a body made of soil, an antifiltration device in the form of a water impermeable geomembrane from polymer material, arranged within the limits of the central part of the dam body and tightly coupled with permafrost soils by means of an ice-ground prism, a freezing system and a layer of heat insulation. The ice-ground prism is made of moist cohesive soil, is arranged under the central part of the dam body on the natural surface of permafrost soils and is frozen to them. Cooling elements of the freezing system are arranged in the ice-ground prism and during the dam operation provide for keeping this prism in ice-ground condition, frozen to permafrost soils. Each cooling element of the freezing system is arranged in the form of a metal pipe of large diametre, providing for visual inspection and repair of such cooling pipe from inside, and by means of inlet and outlet section the cooling pipe is communicated to atmosphere. The layer of heat insulation is made of cellular plastic with tightly closed pores, is arranged underneath the dam body foot on the prepared surface of frozen season-thawing layer at the top side from the geomembrane and above the ice-ground prism, and adjoins it tightly. At the same time the lower part of the geomembrane is tightly jammed in the ice-ground prism.

EFFECT: increased reliability of the ground dam due to higher quality of antifiltration device coupling with base and moderation of frozen soils thawing in the base.

7 cl, 2 dwg