DRAINAGE SYSTEM ON PERMAFROST SOILS Russian patent published in 2017 - IPC E02B11/00 E01F5/00 

FIELD: mining.

SUBSTANCE: drainage system on permafrost soils refers to the construction of earthworks in difficult climatic and geotechnical conditions and is intended for surface and ground water discharge mainly on permafrost soils and in areas of deep seasonal thawing. The drainage system at the permafrost soils contains an upper 2, lower 1 longitudinal trenches made outside the drained territory and filled with coarse-pored fractional draining soil, watertight barrier 3, reinforced shield 4, heat protection shield 5 and waterproof layer 6. The upper longitudinal trench 1 is located directly behind the lower longitudinal trench 2 below the slope of the mountainous terrain 7 with forming of a single stepline trench 12 and formed in an upper part of the seasonal thawing 10 layer. Lower longitudinal trench 2 is formed over the entire depth of seasonal thawing layer 10. Watertight barrier 3 is laid on the side stepped back 13 of a single trench 12, a reinforced shield 4 is laid on the top of it around the perimeter of the single stepline trench 12. A coarse-pored fraction drainage soil of the lower longitudinal trench 2 is wrapped with reinforced shield 4 with forming the drain 14. Lower longitudinal trench 2 at the level of a step 15 of the single stepline trench 12 is covered with heat protection shield 5 above which a waterproof layer 6 is laid to the level of the drained area relief. A waterproof geosynthetic woven material is selected by way of the watertight barrier, and a geosynthetic nonwoven material is selected by way of reinforced shield.

EFFECT: increased maintenance-free service life of the drainage system up to subgrade rearmament landmark duration due to permafrost soil delimitation preservation and seasonal thaw depth, located in the mountainous part of the relief within the drained area, and in natural conditions.

3 cl, 1 dwg