Precautions for laying geomembrane

Protective face

The 10cm-thick protective layer of the geomembrane must be sieved, and no particles larger than 6mm in diameter are allowed, otherwise the geomembrane is easy to pierce. The soil material of the protective layer must be compacted with ramming to ensure that the dry bulk density is above 1.5, and take samples for inspection at any time. When backfilling the protective layer and masonry surface protection, it must be handled gently to avoid breaking the geomembrane. Under the block stone protection surface, a 100mm thick crushed stone or gravel cushion should be filled to prevent the soil protection layer from being washed out due to the influence of water level changes, wind and waves and other factors. The dry block stone shall be laid by artificial hanging lines, the stones shall be tightly embedded, the individual weight of the surface block stone shall be greater than 48kg, and all the gaps shall be filled with small stones.

Peripheral treatment

The requirement of peripheral junction treatment is to tightly connect the composite geomembrane with the surrounding soil, block the seepage inlet, cut off the lateral leakage path, and prevent seepage water from entering the bottom surface of the geomembrane, forming blisters, and swelling and breaking the geomembrane when the reservoir water level drops. . Therefore, it is necessary to dig a water trough at the peripheral junction and bury the geomembrane in the trough.