Method for ecological remediation of side slope

Abstract

The invention discloses a method for ecological remediation of a side slope. According to the method, a reasonable material proportion of a spraying-seeding substrate is summarized on the basis of a lot of test data and project experience, so that the physicochemical properties of the substrate reach the best indexes required for the growth of plants; compared with highly-dispersive soil particlesformed by technologies of the same kind, the soil structure with rich pores is formed by means of the method, can achieve water retention and ventilation, slow down leaching loss of nutrient elements, and guarantee the good growth of root systems of the plants; sprayed artificial soil is small in density, low in unit weight, and large in internal friction angle, is easily attached to a steep slope, and is unlikely to be peeled off; compared with the technologies of the same kind, the spraying-seeding thickness can be obviously increased, and the long-term growth demands of the plants are met.Through the use of polyacrylamide, the effect of flocculating the solid substrate is achieved, so that the substrate sprayed on the slope surface is subjected to solid-liquid separation, clear wateris filtered out, and the loss of the solid substrate and nutrients is reduced; in the dewatering shrinkage process of the substrate, the solid substrate forms a granular structure with certain porosity, and thus the growth of the plants is better facilitated.

Description

technical field [0001] The invention relates to a method for slope ecological restoration, which belongs to the technical field of water and soil 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 damaged 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 restoration of vegetation on slopes is the key and difficult point. Developed countries such as Japan, Europe and the United States have formed their own basic theories and technical solutions for vegetation slope protection technology after decades of research and exploration. Domestic research on slope ecological restoration started relatively late. ...

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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