Geotextile mat three dimensional used in railway, in the transportation infrastructure construction, the service life of the project is closely related to its own drainage system, among which the geotextile mat three dimensional is an important part of the drainage system.

Geotextile mat three dimensional used in railway

Geotextile mat three dimensional is a new geosynthetic material. The composite structure is a three-dimensional geonet core, both sides of which are bonded with needle punched non-woven geotextiles. The 3D geogrid core consists of a thick vertical rib and a diagonal rib at the top and bottom. It can quickly discharge the underground water of the road, and has a pore maintenance system, which can block the capillary water under high load. At the same time, it can also play the role of isolation and foundation reinforcement.

Geotextile mat three dimensional used in railway is made of special three-dimensional geotextile with double-sided bonding. The combination of geotextile (anti filtration) and geonet (drainage and protection) provides a complete "anti filtration drainage protection" effect.

The unique three-dimensional structure of geotextile mat three dimensional used in railway mesh core can bear high compression load in the whole use process, and can maintain a considerable thickness, providing a good water conductivity.

The action characteristics of geotextile mat three dimensional used in railway:

1.Geotextile mat three dimensional used in railway is laid between the foundation and the bottom foundation to drain the water between the foundation and the bottom foundation, block the capillary water and effectively integrate it into the edge drainage system. This structure automatically shortens the drainage way of the foundation, greatly shortens the drainage time, and reduces the number of selected foundation materials (i.e. materials with more fine materials and lower permeability can be used). It can extend the service life of the road.

2.The three-dimensional composite drainage network laid on the sub base of the geotextile mat three dimensional used in railway can prevent the fine materials of the sub base from entering the sub base (that is to say, it plays a role of isolation). The aggregate base course will enter the upper part of the geonet to a limited extent. In this way, the composite geogrid has a potential role in limiting the lateral movement of aggregate base. In this way, its role is similar to the reinforcement of geogrid. Generally speaking, the tensile strength and rigidity of the three-dimensional layer of geotextile are better than many geogrids used for foundation reinforcement, which will enhance the supporting capacity of the foundation.

3.After the road is aged and cracks are formed, most of the rainwater will enter the section. In this case, the geotextile three-dimensional pavement is directly laid under the pavement instead of the drainage foundation. The three-dimensional composite drainage network can collect the water before it enters the foundation / subbase. In addition, a layer of membrane can be wrapped at the bottom of the three-dimensional composite drainage network to further prevent water from entering the foundation. For a rigid road system, this structure allows the design of the road with a higher drainage coefficient CD. Another advantage of this structure is that it is possible to make the concrete hydrate more evenly (the degree of this advantage is being studied). Whether for rigid road or flexible road system, this structure can extend the service life of the road.

4.In the northern climate, geotextile mat three dimensional used in railway can help reduce the frost heaving. If the freezing depth is very deep, the geonet can be laid in the shallower position of the foundation as a capillary block. In addition, the granular subbase which is not easy to frost heave is often used to replace it and extend down to the frozen depth. The backfill soil that is easy to frost heave can be directly filled on the geotextile mat three dimensional used in railway until the surface line of the ground base. In this case, the system can be connected to a drain outlet so that the groundwater level is at or below this depth. In this way, the development of ice crystals can be potentially limited. When ice melts in spring in cold areas, the traffic load is not limited.