Waterproofing Structure of Geomembrane liners/Geomembrane Composite

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Waterproofing Structure of Geomembrane liners/Geomembrane Composite

Jan 03, 2020

Waterproofing structure of geomembrane liners
The geomembrane is the main body of the anti-seepage structure and should meet the stress requirements during construction and operation. Since the anti-seepage effect of the geomembrane is related to the strength and thickness of the membrane, the appropriate thickness should be selected according to the design stress.

The stresses suffered by the geomembrane liners impervious layer during operation mainly come from the unevenness of the foundation and local subsidence and other abnormal phenomena. The design thickness of the geomembrane is related to the material and shape of the support layer. The larger the particle size and angularity of the sandy soil support layer, the greater the required thickness.

hdpe liner installation for shrimp pond in India
Geomembrane liners installation for shrimp pond in India

Waterproofing structure of geomembrane composite
One or both sides of the membrane surface are combined with the geotextile as a whole. Due to its high overall strength, tear resistance, burst resistance, and strong puncture resistance, the geotextile compounded on the membrane surface performs as a support and protective medium.

For impervious structures using composite geomembrane, in general, the transition layer and the support layer after the membrane can be simplified. That is, the concrete surface or the surface composed of crushed stone cushion and concrete plates, dry stone and mortar stone can be directly laid on the membrane. The medium coarse sand cushion or soil protection layer can be directly paved on geomembrane liners.

The thickness of the geomembrane liners should be determined according to the requirements of anti-seepage and strength. Controlling the amount of leakage is particularly important to isolate the source of pollution. Therefore, thickening the geomembrane can effectively reduce the amount of infiltration, and also can ensure that geomembrane will not be punctured through and can be prevent leaking under water pressure.

The reason of geomembrane being punctured is that the contact surface is uneven. The pressure can be caused by water pressure or the load transmitted by the coarse-grained soil. Water pressure is the main cause.

Method for Installation of Waterproof Geomembrane
First, subgrade treatment
The subgrade must be prepared and maintained according to the design requirements. This is the key to ensure the anti-seepage effect, especially the sharp stones, tree roots and other debris must be completely removed. The subgrade does not allow unevenness. A tamp with a ram or ram can be used to make it dense and flat.

Second, laying
When laying the geomembrane liners, they must be laid from top to bottom. The overlap between geomembrane liners, and between geomembrane liner and the subgrade should be flat and tight, but it should not be pulled too tightly, generally it should be slightly loose. The bubbles should be prevented from at the bottom. Because geomembrane liners are relatively thin and light, it is easy to be blown by the wind before the protective layer is laid. Therefore, geomembrane liners should not be deployed with a large area at one time. Lay the protective layer of soil once geomembrane liners are laid well.

Third, stitching
There are three methods of splicing: hot-melt welding, gluing, and compaction. The hot-melt welding has the best waterproof effect.

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