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Special composite geomembrane to understand the classification and main technical requirements of geosynthetics in highway applications

Special composite geomembrane brings you to understand the classification and main technical requirements of geosynthetics in highway applications:

1 Classification and main technical requirements of geosynthetics

1.1 Geotextile
The main types used today are non-woven and spun, and knitted types are rarely used. The geotextile is a water-permeable geosynthetic material with light weight, high tensile strength, good corrosion resistance and microbial resistance, good overall continuity (can be made into a large area as a whole), and convenient for construction. However, it has poor UV aging resistance (it still has good anti-aging properties inside the soil).
1.2 Geomembrane
A relatively impervious film made of asphalt or polymer, both reinforced and unreinforced. Can be factory made or produced on site. The main technical requirements of geomembrane are high strength, chemical stability, heat resistance and deformability, especially good aging resistance and low permeability and water permeability.
1.3 Special geosynthetics
1.3.1 Geogrid
Geogrid is mainly used for reinforced soil structure or geocomposite reinforcement (ribs), and is widely used in geogrid reinforced roadbed. It is divided into plastics and fiberglass .
1.3.2 Geomembrane bag
The geomembrane bag is a joined or separate strip material made of a double layer of polymer fiber fabric. Geomembrane bags are divided into two types: mechanical film bags and simple film bags. The mechanism membrane bag is further divided into a filter drainage point film bag ( FP), a non-reverse drainage drainage film bag (NF), a drainage point concrete film bag (CX), a hinge block type film bag (RB), and a sash type film. Bag (NB). The function of the filter point is to remove the water seepage in the soil, but not to invade the geomembrane bag to replace the template, and to pour the concrete and the second slurry into the geomembrane bag, and then form a structure of clothes or other shapes. For slope protection or foundation treatment works.
1.3.3 Geonet
The geonet is a mesh geosynthetic material with a large mesh, a relatively rigid planar structure or a three-dimensional structure, which is made of fiber strip, thick strand weave or synthetic resin. Mainly used for soft foundation reinforcement cushion, slope protection, grass planting and weaving combined geotechnical materials. The main technical requirements of geonets are tensile strength and modulus of elasticity. The performance of geonets varies greatly depending on the mesh shape, size, thickness and weaving method. When used as reinforcement, attention should be paid to the tensile strength.
1 . 3.4 Geotechnical pads and geocells
Geotechnical mats and geocells are geosynthetic materials of three-dimensional structure. The former is a three-dimensional water-permeable polymer mesh mat composed of filaments, and the latter is a honeycomb or mesh three-dimensional structure composed of geotextile, geogrid or geomembrane, and strip polymer. It is mainly used for anti-crushing and soil-preserving projects. It is mostly used in foundation reinforced cushions or retaining structures with high rigidity and high lateral limit capability.

1.4 composite geosynthetics
It is made up of two or more of geotextile, geomembrane and some special geosynthetics. Combining the advantages of various constituent materials, it achieves versatility and meets the requirements of many projects.

2. Application of geosynthetics
2.1 Filtration and drainage
Placing the geotextile between the soil surface or adjacent soil layers can effectively prevent the passage of particles, thereby preventing the soil from being destroyed due to the loss of soil particles. At the same time, the water or gas in the soil is allowed to be freely discharged through the fabric, so as to avoid the unfavorable consequences of soil instability due to the increase of the pore water pressure. Geosynthetics can be used alone or in combination with other materials, as a filter body, drainage body for dark trenches, seepage, slope protection, drainage after wall of supporting structure, drainage mat on soft foundation embankment foundation, treatment of mud and mud Drainage ditch of sexual frozen soil.
2.2 isolation
Some geosynthetic materials can separate two different particle sizes of soil, sand, stone, or soil, sand, stone and foundation or other buildings to avoid mixing with each other, losing the integrity of various materials and structures, or Soil particle loss occurs. Geotextiles and geomembranes often provide isolation and reinforcement
2.3 reinforcement
The geosynthetics can be placed in the soil to distribute the soil stress, increase the modulus of the soil, transfer the tensile stress, limit the lateral displacement of the soil, and improve the stability of the soil and related buildings. Geotextiles, geomembranes, geonets and some special or composite geosynthetics have reinforced effects. They are mainly used to strengthen the weak foundation: to enhance the stability of the slope: as a reinforced or anchored retaining wall in the backfill of the retaining wall: building a wrapped retaining wall or abutment: reinforcing the flexible pavement and preventing reflection cracks development of. It also has excellent effects in reducing the settlement and settlement difference on the top surface of the roadbed and reducing the misalignment of the bridge head.
2.4 anti-seepage effect
Geomembrane and composite geosynthetics prevent liquid leakage, gas spillage, and environmental or building safety. Geomembrane and composite geosynthetics are mainly used for anti-seepage, anti-seepage, anti-seepage of tunnels and culverts in earth-rock dams and reservoir areas, and prevention of seepage and evaporation of various large liquid containers or pools.
2.5 protection
Many geosynthetic materials can protect the soil, especially the rivers, rainwater, etc.
Soil slope protection can be removed by using stretched mesh turf, fixed grass cloth or grid. Rock slope protection can be done by geonet or geogrid. The roadbed along the river can be washed and protected by geotextile soft sinking and geomembrane bags .

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