3D Erosion Control Mat planting grass, irrigation and slope protection construction plan

The 3D Erosion Control Mat is to to build a protection system with its own growth ability on the slope, and use the growth of vegetation to reinforce soil erosion. However, the structure of the three-dimensional network is based on the comprehensive consideration of the topography, soil quality and environment of the soil slope, in addition to covering a layer of engineering materials on the surface of the slope, and planting slope protection vegetation in a certain proportion.

The role of vegetation in the 3D Erosion Control Mat is mainly considered from three parts. 

The first part is the growth layer of plants, the second part is the humic layer, and the third part is the root layer. 

The growth layer of the plant prevents direct erosion of the surface soil of the slope by rainwater through its own dense covering, thereby reducing soil erosion;

The humic layer mainly provides a protective layer for the surface soil of the slope; 

The root layer is mainly for the slope surface Surface soil provides mechanical stabilization.

3D Erosion Control Mat (3D vegetation net) planting grass, irrigation and slope protection construction plan:

The installation of the 3D Erosion Control Mat can control the erosion of the slope caused by heavy rain and strong wind to a certain extent, increase the firmness of the soil, and reduce the water pressure between the pores and the self-gravity of the soil, thereby reducing soil erosion.

1. Slope cleaning

Remove debris and loose rock blocks on the working surface, trim the corners of the slope and the corners of the slope top to make it arc-shaped, and smooth the working surface as much as possible to facilitate the effective combination of the geonet and the slope, and increase the work Greening effect on the surface; if the rock area on the slope is large, a layer of fine topsoil should be laid on the slope and compacted gently to provide a basic growth environment for plants such as grass and shrubs.

2. Nail the net pad

Excavate trenches with a width of 20cm and a depth of 30cm at the top of the slope and the foot of the slope respectively. Pave the geonet in the trench, fix it with square wooden piles (square pile spacing is 100cm) and fill it with soil. Lay the geonet from top to bottom, the lap length in the vertical and horizontal directions shall not be less than 20cm, and fix it with U-shaped steel nails every 100cm along the longitudinal direction (the lap joints must be fixed), the diagonal spacing is 100cm, and the geonet should be close to the slope. The surface shall not have any hanging wrinkles, and sow grass seeds after the geonet is laid.

3. Backfill

After the three-dimensional geonet pad is fixed, the original surface soil is used for backfilling, and it is manually thrown on the slope surface in 2 to 3 times, and backfilled until the net bag is covered. After each spraying, spray water on the surface of the soil layer. When spraying, the water column should be dispersed and the amount of water should not be too much to avoid loss of the new backfill. The purpose is to make the backfilled soil settle naturally and be moderately compacted to prevent the partial new backfill from separating from the three-dimensional network. The slope surface after filling is required to be smooth and no net bag is exposed. The selected soil particles are well-balanced, powdery, and free of stones and other debris.

4. Sowing grass seeds

(1) Selection of plant seeds

According to the nature of the soil or rock surface of the construction work surface, the local climatic conditions, the construction season, combined with the growth characteristics of various plants, select herb plants with well-developed root systems and seeds of trees and shrubs, and increase the similar tree species on the work surface of similar landforms in the local area. The natural vegetation will gradually merge with the natural ecological vegetation in the next few years, and there will be no trace of artificial carving.

(2) Sowing grass seeds

Choose a professional spreader for spreading. After the equipment is in place, adjust the pressure of the delivery pump and the air output so that the grass seeds are evenly sprayed on the slope, platform and slope protection. After the slope is planted and greened, dig a hole to plant shrubs. When the temperature is lower than 12 ℃, it is not suitable for spreading construction.

5. Deep excavation slope protection

(1) For deep excavation slope protection construction, the excavation shall be carried out step by step from top to bottom. Each level of excavation and level of protection shall be about 8m in height to avoid long-term exposure of the slope;

(2) Chamber blasting is strictly prohibited during stone excavation, and smooth blasting should be used for the part near the slope;

(3) During the construction process, slope control points should be set according to topographical features, geological verification should be carried out at any time according to the excavation situation, and slope stability should be monitored;

(4) Main inspection items:

①Slope top surface survey, mainly to investigate whether there are cracks in the surface soil, timely drain the water in the cracks and seal the cracks to prevent surface water seepage;

②Slope surface survey, the geological section of the excavated section should be recorded during the slope excavation process, and the slope rock layering, joint development and groundwater exposure should be observed. If the combination of structural surfaces is encountered, it is not conducive to slope stability. Emergency measures should be taken in time for groundwater gushing and other situations;

③ Observation standard measurement, regular plane and elevation measurement of each observation point (accurate to millimeters), if continuous increase in deformation is observed, the qualitativeness of slope stability should be carefully studied and necessary emergency measures should be taken.

6. Maintenance management

After the sowing construction is completed, cover with 30g/m2 non-woven fabric, strengthen management, and carry out timely and appropriate water spraying, replanting, weeds and pest control. When the seedling plant grows to 5-6cm or 2 to 3 leaves, then the non-woven fabric can be removed to ensure the normal growth of seedlings.