Geosynthetics (geogrids or geotextiles) can be added to the soil slope to act as reinforcement. As far as the reinforcement function is concerned, compared with the needle-punched geotextile, the geogrid and the reinforced geotextile can work under a smaller strain, while the needle-punched geotextile has a geogrid and the woven geotextile does not have. The water permeability of the geosynthetic material in the plane. In the actual application process, different geosynthetics can be used in combination to make the reinforcement effect better. For example, needle-punched geotextiles and geogrids can be superimposed and laid, and needle-punched geotextiles and woven geotextiles can be superimposed and combined to have reinforcement and drainage functions; geosynthetics can be used as the internal drainage system of the soil slope (vertical and horizontal) Direction) combined with geogrid and woven geotextile.
The application prospect of geosynthetics in reinforced soil slopes is to use geosynthetics as a carrier containing activated carbon fibers to make the geosynthetics a water-conducting filled polymer or metal fiber. Thus, the properties of fine-grained soil in the reinforced zone are improved through electrophoresis, ion transfer and electroosmosis.
reinforced earth retaining wall
Similar to reinforced soil slopes, reinforced soil retaining walls can form upright walls. The reinforced material can be geotextile, but geogrid is more used.
The application prospect of geosynthetics in reinforced soil retaining walls is to set up polymer ropes, strips and anchors (or soil nails) in the anchoring area, and anchor the wall unit in the anchoring area through the reinforcement. In essence, this concept has been adopted on reinforced earth retaining walls in my country in the 1980s. If the reinforced earth retaining wall is close to the rock mass, anchors (or soil nails) can also be anchored on the rock. Earth embankment foundation reinforcement
Reinforcement is set between the embankment and the foundation to reduce uneven settlement. The application prospect of geosynthetics as reinforcement of earth embankment foundation is to find ways to install prestressed reinforcement on site. After stress relaxation, the prestress can reduce the occurrence of displacement.
Concrete dam seepage prevention
Paste geomembrane on the upstream surface of the concrete dam. A horizontal stainless steel tank is set every 2 meters in the vertical direction to clamp the geomembrane.
The improvement of this method is to first set up a geogrid on the upstream surface of the concrete dam, and then paste the geomembrane on the geogrid.
Due to ultraviolet rays and oxidation, the life of geomembrane is limited. In case of high temperature, these effects have a very large impact on most polymer materials. The development prospect in this area should be the development of improved polymer materials to provide geomembrane with longer life.
Earth dam seepage prevention
Geomembrane and lining (GCI.) formed by geosynthetics and cohesive soil have been used on the upstream surface of earth dams or earth dams as impermeable bodies. The latest development is the application of this technology to roller compacted concrete dams. In this case, the geomembrane and the underlaying
Geotextile is pasted on the concrete slab in the factory. This technology effectively reduces horizontal leakage.
Tunnel seepage prevention
The current method is to use geomembrane for the impervious body on the inner side of the permanent concrete, together with the needle-punched non-woven geotextile of larger weight, to set the water guide at the drainage outlet of the tunnel foot to form a closed drainage system. However, the layout of the geomembrane and the geotextile underneath is very difficult. Geosynthetics will sag from the temporary roof and will be easily damaged during the construction of the permanent concrete lining. Geosynthetics should be constructed at the same time as the permanent concrete lining to avoid damage to the geosynthetics during the construction of the permanent concrete lining. The future development is to develop geosynthetics with a life span of more than 100 years to resist the adverse environment around the tunnel.