Both belong to geotechnical materials, a new type of environmentally friendly material. The difference between the two raw materials is that the geotextile is a brand new polyethylene resin particle extracted from crude oil by Sinopec, while the geotextile is made of polyester fiber or polypropylene fiber. The production process is also different. Geomembranes can be made through casting and rolling processes or blown film three-layer co extrusion processes, while geotextiles are formed through non woven repeated needle punching processes. The performance is also different. Geomembranes are mainly used for anti-seepage of the main body, while geotextiles have the function of permeability and mainly play the role of reinforcement protection and filtration in engineering. The price also varies, and the geomembrane is calculated based on its thickness. The thicker the thickness, the higher the price. Most hdpe anti-seepage membranes used in landfills are designed with a thickness of 1.5 or 1.0 millimeters. The urban construction standard for geomembrane geotextile is based on the weight per square meter, and the higher the weight, the higher the price.
(1) Differences in performance and usage
1. Geomembrane is made of high-density polyethylene and mainly used for anti-seepage, while geotextile is made of non-woven fabric and mainly used for strengthening foundations. Its anti-seepage performance mainly depends on the anti-seepage performance of plastic film. When we use it together, it is generally divided into one cloth and one film and two cloth and one film, which can enhance the anti-seepage performance.
2. Geotextile is a permeable geosynthetic material made from synthetic fibers needle punched or woven, widely used in fields such as highways, railways, water conservancy, large buildings, power plant ash dam construction, non-ferrous metal tailings treatment, environmental protection engineering, and soil and water conservation. The plastic film and geotextile of geomembrane are widely used in fields such as highways, railways, water conservancy, large buildings, power plant ash dam construction, non-ferrous metal tailings treatment, environmental protection engineering, and soil and water conservation.
(2) Permeability: Geomembranes are impermeable, while geotextiles are permeable. Geotextiles are a good type of geotechnical data. The permeability coefficient required for geotextile design is 10 times greater than that of soil. Therefore, in order to increase the water head ahead, under the influence of permeability, small soil particles with small diameters near the geotextile can be carried away from the geotextile, gradually forming an elevated layer with a certain thickness composed of coarse soil particles. The particles are thicker and the permeability coefficient is larger. However, it cannot prevent the movement of fine soil particles. When the filtering effect of geotextile is fully exerted, the geotextile membrane will form a natural filtering layer on the upstream side of the overhead layer. The content of fine soil particles in the natural filter layer is higher than that in the overhead layer, and the water permeability is relatively low, which hinders the movement of fine soil particles in adjacent natural soil layers. Although both are new environmentally friendly materials, there are still certain differences in raw material production, performance, and usage. When choosing, everyone should follow their needs.