Requirements of anti-seepage construction of geomembrane

Release time: [2017-08-22 10:47:33]    Views:68


When laying the geomembrane, be sure to lay down from top to bottom. Geomembrane and geomembrane, between the geomembrane and the base surface to flatten close. But not to pull the geomembrane too tight. Generally slightly loose, but no bubble under the geomembrane. Because the geomembrane is relatively thin and light. After paving, without laying the protective layer before the wind can be easily be blown, so a film area should not be large. It should be paving the geomembrane and cover layer of soil protection material.
The requirement of surrounding boundary treatment is that the geomembrane composite is closely connected with the surrounding soil, and the geomembrane blocks the seepage inlet to cut off the lateral leakage path and prevent the seepage from entering the bottom surface of the geomembrane, forming blister. So the surrounding border must be dug the tank, and the geomembrane buried in the tank.
Geomembrane of Zhoutou Reservoir dam, geomembrane composite seepage to take digging, paving, tamping, protecting of the cycle of operation.
Near the geomembrane 10cm thickness protective layer of soil material must be sifted, not allowed to have gravel size bigger than 6 mm, or easy to puncture the geomembrane composite protective layer of soil material must use ramming dense to ensure that the dry bulk density of more than 1.5mm. And sampling inspection at any time. Back-fill protection layer and masonry stone protection surface, be sure to lightly, so as not to break the geomembrane in the block stone face. It should be 100mm thick gravel or gravel cushion. To prevent the water level changes, wind and waves and other factors scouring soil protection layer, dry block stone to take artificial pavement paving stones should be tightly embeded solid surface stone block weight should be greater than 48kg, all the gaps are small stone filling.
The base surface must be cleaned in accordance with the design requirements, which is to ensure that the key impermeable effect, especially for sharp stones, roots and other debris to be completely removed, the base surface does not allow local unevenness, geomembrane composite clean up. Base surface to use hammer or ram tamping to dense formation.
Geomembrane to plastic film as impermeable substrate, and non-woven composite made of geotextile impervious material, new material geomembrane its impermeability depends on the plastic film impermeability. Currently, domestic and foreign seepage application (PVC) and polyethylene (PE), EVA (ethylene / vinyl acetate copolymer), there are also applications in the design of the ECB (ethylene vinyl acetate modified asphalt blending geomembrane) of the plastic film. They are a polymer flexible material, the proportion of small, strong extension, to adapt to high deformation capacity, corrosion resistance, low temperature, good frost resistance.
Geomembrane is mainly used in landfills, waste water treatment plants and other waterproofing works.