The laying of woven geotextile should be determined according to the amount of labor in the construction of the backfill project. With the promotion of the backfill construction, the progress of the drainage board should be controlled at a distance of 3-5 meters in front of the backfill soil, so as to facilitate the maintenance of the drainage board. When the centralized laying method is adopted, the total laying area is not suitable to exceed 1000 m2 or the total construction area of the backfill project on that day Pile point compaction should be carried out to avoid wind turbulence and overturning drainage board and geotextile.

Backfill soil on the drainage equipment to avoid damage to the drainage equipment by the soil truck. The backfill must be backfilled from nearby to inside. The process flow is as follows:

① During the backfilling, the non waterproof cloth shall be laid first, while the non waterproof cloth is laid, the backfill soil mound shall be used for compaction, and then the backfill (the drainage board with cloth can be laid immediately and the backfilling shall be carried out immediately). See the plane design drawing for the pushing sequence of earthwork backfill.

② The first layer of backfill is compacted by manual backfilling, with a thickness of 400mm at one time; then the second layer of soil is backfilled with a thickness of 400mm, and the soil is transported by laborer truck; after the second layer of soil is compacted, the frog rammer can move the earth machinery on the backfill; for sand soil, the first layer of soil can be flushed with water.

③ The thickness of each backfill can be 60b250m.

④ The thickness of 300 ~ 500mm is reserved for artificial foundation soil. Of course, it is backfilled without compaction.

⑤ During the construction of woven geotextile, it is not necessary to crawl hard and cart on the drainage board immediately. The filling starts from the top, and then the soil layer is pulled upward to overload. The mechanical equipment method can be used to push the backfill, from one side to the other side; when the filling reaches 80 cm, the mechanical equipment vehicle can immediately backfill the actual operation.

The thickness and quality (weight) of the backfill and planting materials in each planting area should meet the requirements of landscape architecture and overall design. The planting materials should adopt the cohesive soil layer with good water solubility, and the surface layer of foundation soil should be leveled with an inclination of 1% ~ 3%, and it should be 30mm ~ 100mm lower than the surrounding retaining wall.