1、 Preparation work before laying

1. Foundation treatment: The site should be level and all debris on the site should be removed thoroughly.

2. Prepare materials and arrange the width reasonably according to the design size.

During transportation (including on-site transportation from material storage to work site), geotextile rolls must be protected from damage.

2、 Laying and overlapping methods

1. Manual rolling should be used for laying, which should be smooth, moderately loose, and in contact with the soil surface. The laying personnel should not wear hard soled shoes.

2. The paving on the slope should be carried out from bottom to top; At the top and bottom, they should be fixed, and anti slip nails should be installed on the slope surface, which should be pressed along with the laying.

3. If there is damage, it should be repaired or replaced. There are generally two methods for connecting adjacent pieces: overlap and stitching. The overlap width is generally 300mm, and the stitching is usually done using a overlock machine. For areas where displacement may occur, the overlap width should be appropriately increased, not less than 500mm, for laying on uneven ground, soft soil, and underwater. The upstream piece should be laid on the downstream piece at the water flow point.

4. The connection with the bank slope and structure should be well bonded.

3、 Climate requirements for geotextile construction

1. The temperature should generally be above 5 degrees Celsius. Geotextiles should be tighter at low temperatures and more relaxed at high temperatures.

2. The wind force is below level four.

When the temperature is too low, construction should generally not be carried out in strong winds of level 4 or above, as well as in rainy and snowy weather.

4. In windy weather, when the wind affects the construction of geotextiles, large stones or sandbags should be used to press them firmly.

4、 Backfilling

1. Timely backfill soil materials, and the maximum drop height of backfill soil and stones shall not exceed 300mm. Heavy soil and stones shall not roll and slide on the slope surface.

2. The compaction degree of the fill soil should meet the design requirements. After backfilling with a 300mm loose soil layer, it should be lightly rolled and compacted.

5、 Construction inspection

1. All geotextile sheets and seams must be inspected. Defective geotextile pieces and seams must be clearly marked on the geotextile and repaired.

2. Worn geotextiles must be repaired by laying and hot connecting small pieces of geotextile, which should be at least 200mm longer than the edge of the defect in all directions.

3. The hot connection must be strictly controlled to ensure that the geotextile patch and geotextile are tightly bonded and do not cause damage to the geotextile.