To achieve optimal performance of a structure reinforced with geotextiles, it is vital to develop an adequate construction process, taking into account the recommendations for the handling, transport and storage of the geotextile.
If you want to know the best practices to build the reinforcement of subgrades with geotextiles, Ing. Juan Pablo Vargas, explains it to you in the following video. Remember that you can also access the transcript.
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Find out how the subgrade reinforcement contributed to the success of two projects here.
Construction recommendations for the reinforcement of subgrades with geotextile
In order to guarantee the integrity of the material, from its storage and transportation process to its installation process, it is important to take into account the following recommendations:
- Always store the rolls on smooth and dry surfaces, avoiding stacking them crosswise one to the other.
- If it is necessary to store the rolls outdoors, it is important to do so at least 50 cm above the ground to avoid contact with moisture.
- Take into account the identification label that each of the rolls brings. This is to guarantee adequate quality control and traceability in the work.
Thinking about each of the stages of the construction process and the installation of the geotextile, we give you these recommendations.
- The first stage corresponds to the preparation of the land. This activity consists of adapting the support surface of the geotextile, correcting all existing irregularities and removing any type of debris. If possible you should compact the surface.
RECOMMENDATION: Additionally, it is very important to ensure proper management of subsurface water in the subgrade soil. For this, it is advisable to implement a subdrainage system, prior to placing the geotextile.
- The second stage corresponds to the extension of the geotextile, which can be done manually or with the help of some equipment, as long as the geotextile is kept well raised and tensioned. This to avoid the formation of voids under the material.
RECOMMENDATION: It is very important to take into account the direction of extension of the geotextile since, when the rolls are extended along the track, the continuity in the performance of the material can be affected. For this reason it is important to guarantee optimum efficiency in longitudinal joints or overlaps.
Keep in mind that the minimum dimensions of the overlap must be respected, both longitudinally and transversally. These dimensions must be defined based on the bearing capacity of the subgrade soil, represented in the CBR parameter.
If you opt for sewn joints, you should check their efficiency taking into account the type of thread, the type of seam and the type of machine to be used. In any case, the installation joints must be prepared in accordance with the provisions of article 232, of the technical specifications of the National Institute of Roads (Invias).
- The third stage corresponds to the placement of the material.
This activity must be carried out by pushing, so that the vehicles can move freely over the granular material. The circulation of heavy vehicles directly on the geotextile can alter its mechanical behavior.
RECOMMENDATION: In order to guarantee the development of all the reinforcement mechanisms that justify this application, it is important to ensure adequate anchorage at the installation edges, either by overwidth or by confinement, so that tension is generated at the base of the material.
Learn more about the installation of this and other of our materials in our specialized library. If you don't know its application in real projects, We invite you to consult our success stories below.