There are several construction steps and precautions before geotextile installation, first of all, to avoid damage. Geotextile rolls should be stacked in a flat and water-free place, the height of the stack should not exceed four rolls, and the rolled-up identification sheet should be visible. To prevent UV aging, geotextile rolls must be made of opaque material. When preserving, the integrity of the label and the information should be ensured. Geotextile rolls must be protected from damage during transport (including on-site transport from the material storage site to the worksite).
Geotextile rolls that have been physically damaged must be repaired. Severely worn geotextiles cannot be used. Geotextiles that come into contact with leaking chemicals must not be used in this project.
Geotextile laying method
Using manual roll laying, the cloth surface should be flat and the deformation margin should be appropriately retained. Filament geotextiles or long silk geotextiles are generally lapped, sewn, and welded. The width of the seam and weld is generally above 0.1m, and the width of the lap is generally above 0.2M. If there is a long time exposure, welding or stitching should be carried out.
Geotextiles
Stitching of geotextile
All seams must be continuous (e.g., no point seams are allowed). Before covering, the geotextiles should be overlapped by at least 150 mm. The minimum seam allowance for geotextiles is at least 25 mm from the woven edge (outer edge of the material). sewn geotextile seams are most a thread-locked seam method. The sewn thread should have a minimum tension of more than 60 N resin material and have the same or higher or better chemical and UV resistance than the geotextile. Any missed stitches on the geotextile must be re-stitched in the affected area. After installation, measures should be taken to prevent soil, particles, and impurities from entering the geotextile layer. The fabric surface can be classified as natural lap, seam, or welded according to topography and use.
Construction instructions
All geotextiles and seams must be inspected after construction. Out of defective geotextile pieces and seams must be clearly marked on the geotextile and made to repair. Broken geotextiles must be repaired in all directions at a distance of at least 200 mm, by means of a hot or thermal application, so that the broken geotextile is at least 200 mm long in each direction.
The thermal joint must be strictly controlled so that the geotextile patch is tightly bonded to the geotextile and does not damage the geotextile. Before finishing laying each day, check the geotextile surface laid that day to make sure all damaged areas are marked and repaired immediately to determine if there are any external materials on the surface that could be damaged, such as fine needles, small iron nails, etc. If the geotextile crack exceeds 10% of the width of the roll, the damaged part should be cut off first and then the double geotextile should be connected; if the crack on the slope exceeds 10% of the width of the roll, it should be removed and replaced with a new roll.
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