Construction of Geotextile and Geomembrane
Comparing the construction costs of the two materials, the construction cost of geomembrane is relatively higher. It requires professional personnel and specialized tools for on-site welding. Because the geomembrane material itself is very heavy, each technician needs to be assisted by 6-8 laborers to help unfold the membrane and align it properly for welding. The exact number of laborers depends on the thickness of the geomembrane on site. Additionally, relevant machinery is needed at the construction site to handle the placement of the geomembrane. Overall, this increases the cost. The welders’ wages are 300-400 RMB/day, and the laborers’ wages are calculated according to local rates. Around 3,000㎡ can be welded per day.
Geotextile construction is simpler since the material is lighter. Adjacent sheets only need to overlap; care should be taken to spread the fabric flat and leave some room for deformation.
If required: For overlaps of long or short fiber geotextiles, both welding and sewing are possible, with an overlap width of 10 cm. For natural overlaps, an overlap width of 20 cm is sufficient.
Laying geotextile requires basically no technical expertise, typically needing 2-4 laborers to unroll, straighten, and overlap the fabric. Geotextile is used for drainage, generally either needle-punched nonwoven geotextile or woven geotextile. It functions for filtration, reverse filtration, reinforcement, and has water permeability.
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