Geomembrane and geotextile are two commonly used geosynthetic materials, and they have the following similarities:
Material properties and uses
- Material properties: geomembrane and geotextiles are geosynthetic materials, are made of polymer materials, such as polyethylene, polypropylene and other polymer materials. These materials make them have certain chemical corrosion resistance, water resistance and microbial erosion resistance, and can maintain stable performance in more complex engineering environments.
- Engineering applications: Both in water conservancy, transportation, environmental protection, construction and other engineering fields are widely used. In water conservancy projects, they can be used for seepage prevention of channels, dam construction of reservoirs, etc. In traffic engineering, it can be used for road, railway roadbed reinforcement, slope protection, etc. It also plays an important role in environmental protection projects such as landfills and sewage treatment plants.
Functional characteristics
- Isolation effect: geomembrane and geotextile can play a role in isolating different media. Geomembrane can isolate different soil layers, water bodies and soil to prevent mutual penetration and pollution, such as separating garbage from surrounding soil and groundwater in landfill sites. Geotextiles can also separate soil materials of different properties and particles of different sizes to avoid mixing with each other, ensure the performance and structural stability of each layer of materials, and are often used for isolation between the road base and the surface layer.
- Protective effect: they all have a certain protective function. Geomembrane can prevent the erosion and destruction of the underlying structure by external water and chemical substances, such as preventing the penetration of water to the dam body in the hydraulic structure. Geotextile can protect roadbed, slope, etc., from the influence of natural factors such as rain erosion and weathering, and can also prevent the direct pressure damage of upper objects on the lower structure to a certain extent, such as laying geotextile on the soft soil foundation, which can protect the foundation soil from excessive extrusion of the upper load.
Construction characteristics
- Construction convenience: geomembrane and geotextile in the construction process have a certain convenience. They can all be made into different sizes and shapes according to engineering needs, which is easy to transport and lay on site. And can use mechanical laying or manual laying, can adapt to different construction conditions and project scale.
- Connection method: In the construction, the connection method of geomembrane and geotextile has some similarities. All can be connected by stitching, welding, bonding, etc., to ensure the overall performance and integrity after laying. For example, the common welding methods of geomemes are hot wedge welding, extrusion welding, etc., and geotextiles in some cases will also use stitching or bonding to connect different plates, so that they form a continuous overall structure to better play its function.
why the installation of geotextile is beneath geomembrane?
Geotextiles are installed under the geomembrane for the following reasons:
- Prevent puncturing: The ground may contain sharp objects, such as stones, gravel or branches. Without the protection of geotextiles, these sharp objects can easily puncture the geomembrae during or after installation, damaging its integrity and impermeability. The geotextile acts as a buffer, separating the geomembrane from the rough ground and reducing the risk of puncturing.
- Poorly isolated subgrade: In projects like landfills, subgrade may have uneven settlement or contain hard lumps. Geotextiles can isolate the geomembrane from the roadbed, absorb and buffer the pressure and deformation caused by the roadbed, so as to protect the geomembrane from the damage of uneven stress.
Improved hydraulic performance:
- Drainage function: geotextile has good permeability and drainage performance. When installed under the geomembrane, it quickly drains water that has passed through the geomembrane or accumulated on the surface of the subgrade, preventing the formation of puddles that could affect the stability of the geomembrane and the overall project.
- Filtration and separation: geotextiles can prevent soil particles from mixing with water and blocking drainage channels or pores in the geomembrane. It allows water to pass through while retaining soil particles, maintaining the permeability and normal operation of the drainage system.
Enhanced engineering performance:
- Increase friction: the surface of the geotextile is rough, which can increase the friction between the geomembrane and the roadbed or other adjacent layers. This increased friction helps to hold the geomembrane in place, improve the stability of the overall structure, and prevent the geomembrane from sliding or moving due to external forces such as water pressure or soil displacement.
- Enhancement: although the geomembrane has a certain tensile strength, but when combined with geotextiles, geotextiles can further enhance the overall tensile and tear resistance of the structure. In the case of large deformation or stress in the project, the geotextile and geomembrane work together to share the stress and improve the overall strength and durability of the anti-seepage system.
Although both geotextile and geomembrane belong to geosynthetic materials, they are widely used in engineering fields such as water conservancy and environmental protection, but they are different in many aspects. In terms of material and structure, geotextiles are mostly made of synthetic fibers by needling, spunbonding and other processes, and the structure is loose; Geomembrane is mainly made of high polymer such as polyethylene and has a tight texture. In terms of functional characteristics, geotextiles focus on filtration, drainage, isolation and reinforcement; The core function of geomembrane is seepage prevention and isolation. In appearance, geotextile is similar to cloth, with obvious fiber texture; Geomembrane is a smooth film. In terms of construction, geotextile connections are often stitched, and geomembranes are more welded to ensure the anti-seepage effect. Understanding these differences helps to accurately select and apply the two materials according to actual needs in engineering.
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