A method for slope ecological restoration

Abstract

The invention discloses a method for ecological restoration of slopes. According to a large number of test data and engineering experience, the method summarizes the reasonable material ratio of the spraying substrate, so that the physical and chemical properties of the substrate can reach the optimal index required by plant growth; Compared with the highly dispersed soil particles formed by similar technologies, the soil structure with rich voids in the present invention can retain water and breathe, slow down the leaching of nutrients, and ensure the good growth of plant roots; the sprayed artificial soil has low density, light unit weight, and low internal friction. The angle is large, easy to attach on steep slopes and not easy to peel off. Compared with similar technologies, the thickness of spraying can be significantly increased to meet the long-term growth needs of plants. The use of polyacrylamide has a flocculation effect on the solid matrix, which separates the solid and liquid of the matrix sprayed onto the slope, filters out clear water, and reduces the loss of solid matrix and nutrients; during the syneresis process of the matrix, the solid matrix forms a certain porosity The aggregate structure is more conducive to plant growth.

Description

technical field [0001] The invention relates to a method for ecological restoration of a side slope, belonging to the technical field of soil and water conservation and ecological restoration. Background technique [0002] With the progress of society, more and more attention is paid to the ecological environment. The construction of the project has caused serious damage and impact on the ecological environment. How to restore the ecological environment destroyed during the construction as soon as possible has become an important and urgent issue. [0003] An important part of ecological restoration is to rebuild vegetation, and the vegetation restoration of slopes is one of the key and difficult points. After decades of research and exploration, developed countries such as Japan, Europe and the United States have formed their own basic theories and technical solutions for vegetation slope protection technology. The domestic research on slope ecological restoration started...

AI Technical Summary

Problems solved by technology

[0007] (1) The material ratio is unreasonable, and the physical and chemical properties of the spraying substrate cannot meet the best indicators for plant growth

[0008] (2) The soil is mixed with water to form a mixed slurry, which destroys the aggregate structure of the soil itself. After spraying, the artificial soil formed on the slope loses the pores between the aggregates, and the soil is saturated with capillary water, which is impervious to water and ventilation, similar to "hardening". state, unfavorable for plant growth

To solve this problem in the industry, high-order aggregate spraying technology is used, but the cost of special additives is high, and special equipment is required, which is expensive and difficult to be widely used

[0009] (3) Soil single grains are highly dispersed, the ability to control the release of nutrients is weak, and the nutrient elements in the soil are leached quickly, resulting in premature exhaustion of fertility, unable to maintain the necessary nutrients for plants for a long time, resulting in the degradation of vegetation restoration effect

[0011] (5) The artificial soil after spraying has a high density, a large unit weight, and a small internal friction angle. It is not easy to adhere to steep slopes and is easy to peel off. To solve this problem, it is necessary to use additives to improve its bonding strength, but the excessive strength will aggravate the hardening state. bad for plant growth

[0012] (6) Due to the high density, low strength and low cohesion of the substrate itself, the soil layer formed by spraying is usually thin (about 10cm), which cannot reach the thickness required for long-term growth of plants

[0013] (7) There is no "skeleton" structure in the matrix, which will shrink and expand under the alternating action of drought and rain, and is susceptible to water erosion and winter freeze-thaw erosion, resulting in the loss of the limited matrix and man-made soil erosion face, contrary to the idea of ​​soil and water conservation

[0014] (8) The proportion of additives is unscientific, adding too little can not achieve the expected effect; adding too much will cause changes in the physical and chemical properties of the soil, which is not conducive to plant growth

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