Geomembrane and geotextile are often used in civil engineering construction. There are differences between geotextile and geomembrane.Because they are commonly used geotechnical materials and waterproof materials, and geotextile fabric and geomembrane liner have many similarities and very similar names, most people think they are the same geosynthetics, in fact, they are different materials, the differences between these two aspects (few people know the difference) :
1.Differences in performance and use:
(1) Geomembrane is made of high-density polyethylene, which is mainly used to prevent seepage, while geotextile is made of non-woven fabric, which is mainly used to strengthen the foundation. Its impermeability mainly depends on the impermeability of plastic film.
When we use them, we usually use them together. They are divided into one cloth one membrane and two cloth one membrane, which has stronger anti-seepage performance.
Geotextile is a kind of permeable geosynthetic material made of synthetic fiber by needling or weaving, which is widely used in highway, railway, water conservancy, large-scale construction, power plant ash dam construction, non-ferrous metal tailings treatment, environmental protection engineering, water and soil conservation, etc.
Geomembrane is plastic membrane, and geotextile is fiber cloth geotextile, which is widely used in highway, railway, water conservancy, large-scale construction, power plant ash dam construction, non-ferrous metal tailings treatment, environmental protection engineering, water and soil conservation, etc.
Geomembrane is impermeable, geotextile is permeable.
Geotextile is a kind of good geotechnical data. The design requirement of the permeability coefficient of geotextile is more than 10 times of that of the soil. Therefore, in order to increase the front water head, it is possible to carry the smaller size soil particles close to the geotextile into the geotextile under the effect of the permeability
This situation gradually develops away from the geotextile, and gradually forms a certain thickness of overhead layer composed of coarse soil particles. The particles in this layer are relatively coarse and the permeability coefficient is large, but it can not prevent the movement of fine soil particles
When the filtering effect of geotextile is fully exerted, a natural filter layer will be formed on the upstream side of the overhead layer. The fine soil particle content of the natural filter layer is more than that of the overhead layer, and the water permeability is relatively low, so as to block the movement of the fine soil particles of the adjacent natural soil layer, so it plays a role of retaining soil. This is how geotextile plays a role.
Geomembrane is a kind of relatively impermeable geosynthetics. According to different raw materials, it can be divided into polymer and asphalt. In order to meet the needs of different strength and deformation, there is a distinction between unreinforced and reinforced. Polymer membranes are manufactured in the factory, while asphalt membranes are mostly manufactured in the field.
What is a geomembrane liner made from?The polymers used to make geomembranes are thermoplastic ( PVC geomembrane), crystalline thermoplastic ( HDPE geomembrane), thermoplastic elastomer (such as oxidized polyethylene) and rubber (such as neoprene), etc. The main methods of manufacturing geomembrane are extrusion, calendering or coating.
Extrusion is to make a geomembrane of 0.25-4mm thick from the melted polymer through a mold. Calendering is to roll the thermoplastic polymer into a geomembrane with a thickness of 0.25-2mm. The coating is made by evenly coating the polymer on the paper and uncovering the geomembrane after cooling.
There are same and differences of geotextile and geomembrane.Both geosynthetics are widely used in earthwork project.