| 摘要 |
FIELD: hydraulic engineering.SUBSTANCE: invention relates to hydraulic engineering, specifically to erection of earth dams with cryosolic curtain in body and base. Earth dam on permafrost base is made from base of dam to its crest of soil and comprises upper 3 and local 4 prisms with slopes and anti-filtration cryosolic curtain in body and base, created by means of vertically installed freezing devices 5. On external surface of crest 2, lower 4 and upper 3 prisms of dam to water line 1 there is heat-insulating material 6. Method of creating earth dam with sealing cryosolic curtain in body and base by means of vertically installed freezing devices 5 comprises laying heat-insulating material 6 on surface of crest 2, lower 4 and upper 3 dam slope to water line 1. Placing heat-insulating material 6 is performed after freezing thawed soil layers of body and base of dam and maximum cooling by freezing devices 5 and heat exchange of surface of dam with cold ambient air in end of first winter after dam construction. Heat-insulating material 6 can be a layer of soil or fixing anchors. Freezing device can be mounted in previously drilled wells, which are embedded in permafrost at a depth of not less than h1 equal to 1.0-1.5 m, with pitch providing for closure of ice-ground cylinders, formed by separate devices. Tests on method for creating sealing cryosolic curtain in soil structures were conducted on protective dam on Lake Krugloe in Yakutia, showing effectiveness of method.EFFECT: technical result of present group of inventions is maintaining in warm season upper surface of sealing cryosolic curtain at a higher level and reduced as a result, height of dam and flow rate of building soil.4 cl, 2 dwg |
