METHOD FOR ERECTION OF EARTHFILL STRUCTURE, OF DAM TYPE WITH INSPECTION PATH ON SOFT GROUND Russian patent published in 2009 - IPC E02D17/18 

FIELD: construction.

SUBSTANCE: invention is related to hydrotechnical construction of dams with inspection path erected on soft and subsiding grounds. Method for erection of earthfill structure includes double-layer laying of geotextile on ground and bends of geotextile ends with creation of closed circuit of filtration screen. The first layer is laid onto natural ground from soft geotextile with further filling of layer sand on it with height of 20-30 cm. Ends of soft geotextile are folded on top of fill from its lateral sides closer to the middle of its open surface, at equal distance from lateral sides of fill. Length of folding ends from lateral sides of fill are set as equal to triple height of sand fill. The second layer from rigid geotextile is applied on top onto open and closed surfaces of fill. Ends of hard geotextile are freely lowered along fill slant with enveloping of its lateral sides pressed by soft geotextile. Ends of hard geotextile are lowered down to the level of natural ground and are installed on foundation ground at the length of 50-70 cm from lateral sides of fill for the possibility of tight and strong pressing of hard geotextile ends to foundation base. On top on layer of hard geotextile, geogrid is installed with filling of sand layer into its cells. Filling is carried out by height that corresponds to height of geogrid and is higher than that by 5-10 cm for creation of additional extent of sand compaction. On geogrid on lateral sides of fill and onto lowered ends of hard geotextile, drainage layer is applied from crushed stone with fraction of 40-70 mm, on which road layer is laid from crushed stone of fraction 20-40 mm. Thickness of drainage layer filling from crushed stone is set depending on required height of erected earthfill structure.

EFFECT: improved strength of earthfill structure, its stability to effect of external loads from transport passing by.

2 dwg