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Geomembrane requirements
Process flow
Zhoutou Reservoir dam composite geomembrane anti-seepage adopts the section cycle operation of digging, laying, ramming and protecting.
Base surface cleaning
The base surface must be cleaned according to the design requirements, which is the key to ensure the anti-seepage effect, especially the debris such as sharp stones and tree roots should be completely removed. Use a tamper or tamper to tamp it tightly to make it compact and level.
composite laying
When laying the film, it must be laid from bottom to top. The film and the film and between the film and the base surface should be pressed flat and tightly, but the film should not be pulled too tightly. Generally, it should be slightly loose, but there should be no air bubbles at the bottom of the film. Because the geomembrane is relatively thin and light, it is very easy to be blown by the wind before the protective layer is laid after laying, so the area of one laying membrane should not be large, and it is best to cover the protective layer with soil material while laying the membrane.
According to the information provided by the manufacturer, the width of the composite geomembrane is 1.0~1.9m, and the width of 1.9m is selected for this project to reduce the material used for the joint. The joints are hot-bonded, glued, lap joint and other methods. The design of this project adopts glue, and the joint width is 50mm.
If a puncture or tear of the geomembrane is found, it must be repaired with a geomembrane adhesive three times the size of the damaged area.
protective face
The 10cm-thick protective layer soil material by the geomembrane must be sieved, and no particles larger than 6mm in size are allowed, otherwise the geomembrane will be easily pierced. The soil material of the protective layer must be compacted by tamping to ensure that the dry bulk density is above 1.5, and sampling inspection shall be conducted at any time. When backfilling the protective layer and building block stone protective surface, it must be handled lightly to avoid breaking the geomembrane. Under the block stone protective surface, a 100mm thick gravel or gravel cushion should be laid to prevent the soil protection layer from being washed away due to the influence of water level changes, wind and waves and other factors. Dry masonry blocks shall be paved with artificial hanging lines, the blocks shall be tightly embedded, the individual weight of the surface blocks shall be greater than 48kg, and all gaps shall be filled with small blocks.
Peripheral processing
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, prevent seepage water from entering the bottom surface of the geomembrane, form blisters, and burst the geomembrane when the reservoir water level drops. . Therefore, the perimeter junction must dig a water interception groove and bury the geomembrane in the groove .
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