Origin of three-dimensional vegetation network in Yancheng, Jiangsu

The three-dimensional vegetation net is a three-dimensional structure used for planting grass and solidifying the soil. The texture is loose and flexible, like a loofah network. It leaves 50% space that can be filled with soil, gravel and fine stones. Plant roots can pass through it comfortably, neatly and neatly. The balanced growth of the mature turf firmly combines the surface of the mesh mat, turf, and soil together. Because the plant roots can penetrate deep into the ground, a solid green composite protective layer is formed.
Three-dimensional vegetation network overview editor
Three-dimensional vegetation network slope protection technology combines the advantages of geonets and vegetation slope protection to effectively solve the protection problems of rocky slopes and high and steep slopes. Application examples show that the three-dimensional vegetation net slope protection is extremely beneficial to the stability of the slope and the protection effect is very good.
The three-dimensional vegetation network slope protection technology that has emerged in recent years not only significantly improves the overall and local stability of the slope, but also facilitates the growth of slope vegetation. At the same time, the project cost is also lower, which is in line with the development direction of slope engineering in my country's soil and water. It has great application value in maintenance.
Basic principles of three-dimensional vegetation network slope protectionEdit
The concept of three-dimensional vegetation network slope protection
Three-dimensional vegetation network slope protection refers to the use of active plants combined with geosynthetic materials and other engineering materials to build a slope with its own The growth protection system is a new technology that reinforces slopes through the growth of plants. According to the characteristics of the slope topography, soil quality and regional climate, the slope surface is covered with a layer of geosynthetic material and a variety of plants are planted in a certain combination and spacing. Through the growth activities of plants, the purpose of root system reinforcement and stem and leaf erosion prevention can be achieved. After ecological slope protection technology, dense vegetation can be formed on the slope surface to cover the topsoil layer to form an intertwined root system, which can effectively inhibit the erosion of the slope by heavy rain runoff and increase the soil mass. The shear strength reduces the pore water pressure and the self-gravity of the soil, thereby greatly improving the stability and erosion resistance of the slope.
Slope protection mechanism of three-dimensional vegetation network
The anti-erosion effect of vegetation is achieved through its three main components: First, the growth layer of the plant (including perianth, leaf sheaths, leaves, and stems) passes through Its own dense coverage prevents the surface soil of the slope from being directly eroded by rainwater, reduces the erosion energy of heavy rain runoff and surface runoff speed, thereby reducing soil loss. Secondly, the humus layer (including the interface between leaf litter and rhizomes) provides water for the surface soil of the slope. The third protective layer is the root layer, which provides mechanical stabilization for the reinforced anchorage of the surface soil on the slope. Under normal circumstances, in the early stages of plant growth, the root system formed by a single plant is only loosely tangled together, and the root system that does not lie down easily separates from the soil layer and cannot provide protection. The application of three-dimensional network is to achieve more thorough shallow protection by enhancing the effects of the above three aspects. One is to increase its protective performance and mechanical stability within a certain thickness range. The other is due to the existence of the three-dimensional mesh. The huge root system of the plants is connected with the mesh of the three-dimensional mesh to form a plate structure (equivalent to the surface soil reinforcement of the slope). This increases the tensile strength and shear strength of the protective layer to limit the expansion of the phenomenon of gradual damage caused by erosion (erosion will directly cause damage to individual plants and increase the damaged area over time), and ultimately limits the shallow slopes. The occurrence of surface sliding and uplift.
The role of three-dimensional vegetation net slope protection
The three-dimensional vegetation net slope protection technology combines the advantages of geonet and plant slope protection and plays the role of composite slope protection. When the vegetation coverage rate of the slope reaches more than %, it can withstand the erosion of light rain. When the vegetation coverage rate reaches more than %, it can withstand the erosion of heavy rain. When the plants grow vigorously, the runoff flow rate that can resist erosion is more than twice that of ordinary turf. The existence of geonet has a good effect on reducing the evaporation of water in the slope soil and increasing the infiltration amount. At the same time, because the geonet material is black polyethylene, it has the effect of heat absorption and heat preservation, which can promote seed germination and is beneficial to plant growth.
Quick protection measures
⑴ When there is a conflict between the construction period and the vegetation cultivation period, when the project is just completed and enters the heavy rain season, reinforced turf must be used to quickly protect the project so that full coverage of anti-scouring can be obtained after completion. vegetation. Reinforced turf uses a three-dimensional vegetation net to pre-cultivate the turf in the lawn planting field or the open space near the construction site. After the turf is formed into a flat surface, it can be rolled up in whole or in pieces and then laid on the slope that needs protection.
⑵ In arid areas that are difficult to control, soil coagulant can be used to mix the selected suitable grass seeds with the soil coagulant after special treatment and spray (you can also sow grass seeds first and then apply the soil coagulant). Grass seeds and soil on slopes treated with soil coagulant will not be lost due to wind and rain. At the same time, the coagulant reduces the evaporation of water in the soil, ensuring the water supply of grass seeds to a certain extent and greatly improving the survival of grass seeds. Rate.
Construction Technology Editor
Slope Treatment
Clean up the debris on the slope and backfill and compact the low-lying areas to ensure a smooth slope.
Laying the three-dimensional mesh
⑴ Laying the three-dimensional vegetation mesh along the slope from top to bottom to maintain a smooth connection between the mesh and the slope.
⑵ When laying the pre-embedded three-dimensional mesh on the top of the slope, it needs to be extended, buried in the soil and compacted.
⑶ Anchor the three-dimensional mesh from bottom to top using shaped steel bars of ф or above to fix the three-dimensional mesh. The length of the steel bars is about ~ ~ width and the spacing between the shaped steel bars is about . ~. Use ﹟-shaped iron nails or bamboo nails in the middle for auxiliary fixation.
⑷After the laying of the soil-covered three-dimensional vegetation net is completed, cover the soil evenly on the three-dimensional vegetation net and cover the net bag until no empty bags appear. Ensure that the soil thickness on the three-dimensional vegetation net is not less than 1. Then mix fertilizer, auxin and cement in a certain proportion and evenly spread on the surface. The fertilizer is nitrogen:phosphorus:potassium=:: or nitrogen:phosphorus:potassium=:: compound fertilizer and the amount of organic fertilizer is about ~/㎡.
Spraying
After the soil backfill is completed, hydraulic spraying will be carried out, which will include grass seeds (sprayed at a rate of about one square gram) and adhesives, wood fibers, fertilizers, auxins, moisturizers and water to promote their growth. Mix and stir in a certain proportion to form a uniform mixture and spray it evenly on the slope through a hydraulic sprayer.
Covering
After the spraying and grass planting construction is completed, the slope surface is covered with non-woven fabric to maintain slope moisture and reduce the erosion of seeds by rainfall to promote seed growth. If the temperature is too high, there is no need to cover it to avoid the occurrence of pests and diseases.
Maintenance and management
After the grass spraying construction is completed, regular maintenance must be carried out until the lawn becomes flat. The non-woven fabric can be uncovered when the lawn is about 10 feet long.
Feature Editor
The embankment can be protected from wind and rain erosion before the turf grows.
It can keep grass seeds evenly distributed on the slope and protect them from wind and rain.
Mesh mats can absorb a large amount of heat energy, enhance ground temperature, promote grass seed germination, and extend the growth period of plants.
The composite protective layer formed by the growth of plants can withstand high water levels and high flow rates.
It can replace concrete, asphalt, rocks and other slope materials and is mainly used for slope protection of roads, railways, rivers, dams and other slopes.