The three-dimensional vegetation net slope protection technology integrates the advantages of geotechnical net and vegetation slope protection, and can effectively solve the problems of rock slope and steep slope protection. The application example shows that the three-dimensional vegetation net slope protection is beneficial to the stability of the slope, and the protection effect is very good.
In recent years, the three-dimensional vegetation net slope protection technology not only significantly improves the overall and local stability of the slope, but also is conducive to the growth of slope vegetation. At the same time, the project cost is low, which conforms to the development direction of slope engineering, and has great application value in water and soil conservation in China.
3D vegetation net slope protection refers to the use of active plants and engineering materials such as geosynthetics to build a protection system with its own growth capacity on the slope surface, and strengthen the slope through the growth of plants door New technology. According to the landform, soil quality and regional climate of the slope, a layer of geosynthetics shall be covered on the slope surface and various plants shall be planted at a certain combination and spacing. The purpose of root reinforcement and erosion prevention of stems and leaves can be achieved through plant growth activities. After slope protection technology, dense vegetation coverage can be formed on the slope surface and the topsoil layer Packing Staggered root system and rainstorm runoff erode the slope, increase the shear strength of soil, reduce the pore water pressure and soil gravity, thus greatly improving the stability and scouring capacity of the slope.
Slope treatment
Clean up the miscellaneous stones and debris on the slope, backfill and tamp the low-lying areas to ensure the smoothness of the slope.
Lay 3D network
(1) Pave the three-dimensional vegetation net on the slope from top to bottom along the slope, and keep a smooth combination between the net and the slope.
(2) When the embedded three-dimensional network is laid on the slope top, it needs to extend 40~80cm, be buried in the soil and compacted.
(3) Anchorage: fix the three-dimensional mesh from bottom to top with U-shaped rebars of more than ф 6mm. The U-shaped rebars are about 15~30cm long and 8mm wide. The spacing between U-shaped rebars is about 1.5~2.5m, and 8 # U-shaped rebars are used in the middle Nails Or bamboo nails for auxiliary fixation.
⑷ After the three-dimensional vegetation net covering soil is paved, the soil shall be evenly covered on the three-dimensional vegetation net, and the net shall be covered until there is no empty bag, so as to ensure that the soil thickness on the three-dimensional vegetation net is not less than 12mm. Then mix the fertilizer, auxin and cementing agent in a certain proportion and sprinkle them on the surface. The fertilizer is compound fertilizer with N: P: K=15:15:15 or N: P: K=10:8:7 and N content of about 30-50g/㎡.
Spray seeding
After backfilling, hydraulic spraying shall be carried out, that is, grass seeds (sprayed at about 25g per square meter) and the adhesive, wood fiber, fertilizer, auxin, preservative and water that promote their growth shall be mixed in a certain proportion to form a uniform mixture, which shall be evenly sprayed on the slope by hydraulic sprayer.
cover
After the completion of spray seeding and grass planting, the slope surface shall be covered with non-woven fabric to maintain the slope surface moisture, reduce the erosion of seeds by rainfall and promote the growth of seeds. If the temperature is too high, it will be covered to prevent the occurrence of diseases and pests.
maintenance management
After the completion of grass spraying construction, regular maintenance shall be carried out until the lawn is leveled. When the lawn is about 5cm long, the non-woven fabric can be uncovered.
