CN115589806A

CN115589806A - Slope ecological restoration method

Info

Publication number: CN115589806A
Application number: CN202211197191.6A
Authority: CN
Inventors: 王林瀚; 卢正才; 柴陆军; 李洋; 刘峰; 高玉璞; 张丽; 王云; 耿飞; 张顺; 李涛
Original assignee: Baotou Steel Group Co Bayan Obo Iron Mine; Shandong Linyinda Ecological Engineering Co ltd; Beijing Bailing Tiandi Environmental Protection Technology Co ltd
Current assignee: Baotou Steel Group Co Bayan Obo Iron Mine; Shandong Linyinda Ecological Engineering Co ltd; Beijing Bailing Tiandi Environmental Protection Technology Co ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2023-01-13

Abstract

The application discloses a slope ecological restoration method and relates to the technical field of ecological restoration. The method for restoring the ecological slope is applied to the slope with the slope ratio less than or equal to 1, and comprises the following steps: cleaning the slope surface of the side slope to flatten the slope surface; uniformly digging a plurality of planting holes with the depth of 25-35cm on the slope body of the side slope; grouting and filling a slurry mixture into the slope body of the side slope; filling the planting holes with planting soil; spraying grass seed mixture on the surface of the slope body of the side slope; the grass seed mixture comprises the following raw materials: water, planting soil, organic fertilizer, microbial agent, grass fiber, mixed seeds, water-retaining agent and binder; planting arbor and shrub in the planting hole; and covering the surface of the vegetation layer with non-woven fabric, and watering and maintaining. The side slope ecological restoration method has the advantages of low manufacturing cost, short construction period and excellent restoration effect.

Description

Ecological restoration method for side slope

Technical Field

The application relates to the technical field of ecological restoration, in particular to a slope ecological restoration method.

Background

The foundation construction such as mineral mining and highway construction is easy to form a side slope with a loose structure, and the side slope is a slope surface with a certain slope. The slope body of the side slope has the risk of collapse and landslide when rainwater permeates or is interfered by external force in rainy season. In addition, in the dry season, the slope body is in a ventilated state, and the root system of the vegetation is always in a water and nutrient deficient state, so that the vegetation on the slope is easy to degrade and even wither. At present, the side slope formed by waste slag stones and waste soil is generally subjected to ecological restoration by adopting a net hanging and spray sowing mode. The net hanging and spray seeding is a comprehensive environment protection technology for the subjects of rock and stone collection mechanics, soil science, biology, fertilizer science, horticulture, ecology and the like. The net hanging and spraying is a technology for fixing net sheets on a slope surface to reinforce the slope structure, and then spraying base materials such as soil, fertilizer, organic matters, plant seeds and the like, so that a planting matrix with a certain thickness and capable of enabling plants to grow is formed on the slope surface.

However, the construction cost for ecological restoration of the side slope by the conventional net hanging and spray seeding mode is high, and the construction period is long. Therefore, the development of a slope ecological restoration method with excellent restoration effect, low cost and short construction period is urgent.

Disclosure of Invention

In order to improve the ecological restoration effect of the side slope, reduce the side slope ecological restoration cost simultaneously, and shorten the side slope ecological restoration time limit, the application provides a side slope ecological restoration method, adopts the following technical scheme:

a side slope ecological restoration method is applied to a side slope with a slope ratio of less than or equal to 1, and comprises the following steps:

1) Slope surface cleaning: cleaning the slope surface of the side slope to flatten the slope surface;

2) Digging a planting hole: uniformly digging a plurality of planting holes with the depth of 25-35cm on the slope body of the side slope;

3) Grouting: injecting a grouting mixture into the slope body of the side slope, wherein the injection depth of the grouting mixture in the slope body of the side slope is 40-50cm, so as to form a nutrient grouting layer with the thickness of 40-50 cm;

the grouting mixture comprises the following raw materials in parts by weight: 950-1050 parts of water, 1050-1200 parts of planting soil, 50-75 parts of organic fertilizer, 2.5-3 parts of compound fertilizer and 0.01-0.015 part of microbial agent;

4) Backfilling planting holes: filling the planting holes with planting soil;

5) Spray seeding: spraying grass seed mixture on the surface of the slope body of the side slope to form a vegetation layer with the thickness of 1.5-3.5 cm;

the grass seed mixture comprises the following raw materials in parts by weight: 950-1050 parts of water, 1400-1600 parts of planting soil, 25-30 parts of organic fertilizer, 0.01-0.012 part of microbial agent, 25-30 parts of grass fiber, 1.2-1.5 parts of mixed seed, 0.25-0.3 part of water-retaining agent and 0.35-0.4 part of binder;

6) Planting: planting trees and shrubs in the planting holes;

7) And (3) maintenance: and covering the surface of the vegetation layer with non-woven fabrics, and watering and maintaining.

By adopting the technical scheme, the range of 30d vegetation coverage of the slope restored by the slope ecological restoration method is 54.6-56.2%; the vegetation coverage range of 60d is 86.7-88.7%; the 90d vegetation coverage range is 99.1-100%; the soil erosion rate range of 30d is 3.0-4.0%; the soil erosion rate range is 4.1-5.1% in 60 d; the soil erosion rate range of 90d is 4.8-5.9%; the range of the survival rate of the plants is 74.1-75.9%. According to the slope ecological restoration method, the plant survival rate and the plant coverage rate of the slope are obviously improved and the soil erosion rate is reduced through the mutual synergistic effect among the steps, the mutual synergistic effect among the raw materials in the grouting mixture and the mutual synergistic effect among the raw materials in the grass seed mixture. In addition, the side slope ecological restoration method is short in construction period and low in manufacturing cost, and meets the social development requirements.

The slope ecological restoration method is suitable for a slope with a slope ratio of less than or equal to 1, and the slope of the slope with the slope ratio of less than or equal to 1 is relatively slow, so that the stability of the base material of the subsequent spray seeding adsorbed on the slope is relatively strong and the base material is not easy to slip. In addition, before spray seeding, a slurry mixture is injected into the slope body of the side slope, so that the stability of the slope body of the side slope is enhanced, and the water and soil loss resistance is improved. Meanwhile, the grass fiber is added into the grass seed mixture, so that the grass fiber can fix the vegetable layer on the surface of the slope body of the side slope, and the side slope ecological restoration method in the application has excellent restoration effect without net hanging. In addition, the amount of the base material for spray-seeding is small, and the thickness of the vegetation layer formed after spray-seeding is small, so that the construction cost for slope restoration is reduced. In addition, the slope ecological restoration method does not need conventional net hanging operation, so that the material cost and the mechanical and labor cost used in the net hanging process can be reduced, and the cost of slope restoration can be further reduced. In addition, the side slope ecological restoration method does not need conventional net hanging operation, and the construction period can be shortened, so that the construction period of the side slope ecological restoration method is about one third of the construction period of side slope restoration through net hanging spray seeding.

In addition, the side slope ecological restoration method in the application sprays the grass seed mixture on the surface of the side slope body at one time to form the vegetation layer, and the base material and the grass seeds are required to be separately sprayed and sown without the conventional net hanging and spraying, so that the construction period is shortened. And the mixed seeds, the base material, the binder and the water-retaining agent are uniformly mixed and then sprayed on the surface of the slope body of the side slope, so that the stability of the mixed seeds on the surface of the slope body of the side slope is enhanced, the mixed seeds are not easy to run off, the stability and the water and soil loss resistance of the side slope are improved, and the vegetation coverage rate and the plant survival rate of the side slope are improved.

Optionally, the planting holes are distributed in a rectangular array on a slope body of the side slope.

By adopting the technical scheme, the trees and shrubs can be uniformly distributed on the slope body of the side slope after being planted in the planting holes, and the stability of the side slope is further improved.

Optionally, the organic fertilizer is decomposed farmyard manure.

By adopting the technical scheme, the side slope is beneficial to providing a long-term nutrient supply environment for later-stage vegetation growth, and the vegetation coverage rate and the plant survival rate of the side slope are improved.

Optionally, the microbial agent is a mixture of trichoderma harzianum and bacillus subtilis.

By adopting the technical scheme, the trichoderma harzianum and the bacillus subtilis are mutually cooperated, so that the fertility of a slope body of the side slope can be further improved, a long-term nutrient supply environment is provided for later vegetation growth, and the vegetation coverage rate and the plant survival rate are improved.

Optionally, the grain size of the planting soil is less than or equal to 3cm.

By adopting the technical scheme, the particle size of the planting soil is small, the binding power of the planting soil is improved, the slope stability is enhanced, meanwhile, the plants can absorb nutrients in the planting soil, and the survival rate of the plants is improved.

Optionally, the raw materials of the grouting mixture further include 6-8 parts by weight of gamma cyclodextrin.

By adopting the technical scheme, the addition of the gamma cyclodextrin can not only improve the compatibility among raw materials in the grouting mixture and improve the permeability of the grouting mixture, but also further enhance the reinforcing effect of the grouting mixture on the side slope and improve the stability of the side slope.

Optionally, the length of the grass fibers is 3-5cm.

Optionally, the raw material of the grass seed mixture also comprises 3-6 parts of hydroxypropyl methyl cellulose.

By adopting the technical scheme, the hydroxypropyl methyl cellulose has excellent film forming property, not only can improve the stability of the side slope and reduce the soil erosion rate, but also can improve the soil fertility and improve the survival rate of plants and the vegetation coverage rate.

Optionally, the binder is portland cement.

By adopting the technical scheme, the portland cement can remarkably improve the bonding force between the vegetable layer and the surface of the slope body of the side slope, so that the vegetable layer is not easy to slide and has strong water and soil loss resistance.

In summary, the present application has at least the following beneficial effects:

1. according to the slope ecological restoration method, the manufacturing cost of slope ecological restoration is reduced through the mutual synergistic effect of the steps, the construction period of the slope ecological restoration is shortened, and the excellent restoration effect is achieved;

2. by adding the gamma cyclodextrin into the grouting mixture, the soil erosion rate of the side slope is further reduced, and the vegetation coverage rate and the plant survival rate of the side slope are improved;

3. by adding hydroxypropyl methyl cellulose into the grass seed mixture, the soil erosion rate of the side slope is further reduced, and the vegetation coverage rate and the plant survival rate of the side slope are improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Fig. 1 is a schematic view of a repaired slope structure provided in an embodiment of the present application.

Detailed Description

The present invention will be described in further detail with reference to examples.

Raw materials

The plant ash organic fertilizer contains potassium carbonate as an effective component, the effective content is 99%, and the source is natural plants; the calcium superphosphate compound fertilizer is of agricultural grade, and the total phosphorus content is more than or equal to 12 percent; trichoderma harzianum in the form of powder with effective content of 50 hundred million and water content of 10%; the bacillus subtilis is in a powder form, the content of effective substances is 98 percent, and the culture temperature is 37 ℃; hydroxypropyl methylcellulose, type food grade, content 52%, effective substance content 99%; the decomposed farmyard manure comprises the components of animal manure, namely fermentation and decomposition, wherein the content of organic matters is more than or equal to 45 percent, the content of nitrogen, phosphorus and potassium is more than or equal to 5 percent, and the content of water is less than or equal to 30 percent; gamma cyclodextrin selected from the group consisting of Cissampeloti organic Biotech, inc.; the portland cement is portland slag cement, the initial setting time is 3.2h, and the portland cement is selected from Shenyang city and Hongkong Hao Hua industrial salt sales places.

Preparation example

Preparation example I

Preparation example I-1

A grouting mixture is prepared by adopting the following method:

sieving the planting soil by a 4.0cm sieve, and then uniformly mixing 1100kg of the planting soil after sieving with 1050kg of water to obtain a mixture; then adding 60kg of organic fertilizer, 2.5kg of compound fertilizer and 0.01kg of microbial agent into the mixture, and stirring for 30min to obtain a grouting mixture;

wherein the organic fertilizer is plant ash organic fertilizer; the compound fertilizer is a calcium superphosphate compound fertilizer; microbial inoculum bacillus subtilis.

Preparation example I-2

A grouting mixture is different from the grouting mixture prepared in the preparation example I-1 in that organic fertilizers are decomposed farmyard manure with the same amount, and the rest are the same as the grouting mixture prepared in the preparation example I-1.

Preparation example I-3

A grouting mixture is different from the grouting mixture prepared in preparation example I-2 in that a microbial agent is Trichoderma harzianum in equal amount, and the rest is the same as the grouting mixture prepared in preparation example I-2.

Preparation example I-4

A grouting mixture is different from the preparation example I-2 in that a microbial agent is a mixture of equal amounts of Trichoderma harzianum and Bacillus subtilis, the mass ratio of the Trichoderma harzianum to the Bacillus subtilis is 1, and the balance is the same as the preparation example I-2.

Preparation examples I-5

The grouting mixture is characterized in that the raw materials of the grouting mixture also comprise 6kg of gamma-cyclodextrin, and in the preparation process of the grouting mixture, the gamma-cyclodextrin, an organic fertilizer, a compound fertilizer and a microbial agent are added into the grouting mixture, and the rest is the same as that in the preparation example I-4.

Preparation example I-6

A grouting mixture, which is different from preparation example I-5 in that planting soil is passed through a 3.0cm sieve, and the rest is the same as preparation example I-5.

Preparation example II

Preparation example II-1

A grass seed mixture, which is prepared by adopting the following method:

1050kg of water and 1500kg of planting soil passing through a 3.0cm screen mesh are uniformly mixed, 25kg of grass fiber is added under the stirring condition, then 28kg of organic fertilizer and 0.01kg of microbial agent are added, the mixture is stirred until the mixture is uniformly mixed, 1.3kg of mixed seeds are added, and the mixture is stirred for 15min to obtain a premix; adding 0.25kg of water-retaining agent and 0.35kg of adhesive into the premix under the condition of stirring;

wherein the length of the grass fiber is 3-5cm, and the material is straw; the organic fertilizer is decomposed farmyard manure; the microbial agent is a mixture of trichoderma harzianum and bacillus subtilis with the mass ratio of 1; the mixed seeds are arbor-shrub-grass mixed seeds; the water-retaining agent is a root powder hydroponic plant sylvite water-retaining agent; the binder has a product number of FMN-95, and is selected from Guangxi Zhongxing ecological garden Limited company, and the content of effective components is 98%.

Preparation example II-2

A grass seed mixture which differs from preparation II-1 in that the binder is an equal amount of portland cement and the remainder is the same as preparation II-1.

Preparation example II-3

A grass seed mixture, which is different from preparation example II-2 in that 4kg of hydroxypropyl methylcellulose is further included in the raw materials of the grass seed mixture, and the hydroxypropyl methylcellulose is simultaneously added to a premix with a water-retaining agent and a binder during the preparation of the grass seed mixture, and the rest is the same as preparation example II-2.

Examples

Example 1

A slope ecological restoration method comprises the following steps:

2) Digging a planting hole: uniformly digging a plurality of planting holes with the depth of 30cm on the slope body of the side slope according to the distance of 1.5 m multiplied by 1.5 m, wherein the planting holes are distributed on the slope body of the side slope in a rectangular array;

3) Grouting: injecting and filling a grouting mixture into the slope body of the side slope, wherein the injection depth of the grouting mixture in the slope body of the side slope is 45cm so as to form a nutrient grouting layer with the thickness of 45cm, and the grouting mixture is prepared by the preparation example I-1;

4) Backfilling planting holes: filling planting holes with planting soil;

5) Spray seeding: spraying a grass seed mixture on the surface of the slope body of the side slope to form a vegetation layer with the thickness of 2cm, wherein the grass seed mixture is prepared by the preparation example II-1;

6) Planting: planting arbor and shrub in the planting hole;

7) And (3) maintenance: covering the surface of the vegetation layer with non-woven fabric, and watering and maintaining;

the slope structure restored by the slope ecological restoration method is shown in fig. 1, the slope is a slag discharging field slope, the slope ratio of a slag stone slope body of the slag discharging field slope is 0.9; after the slag stone slope body is subjected to grouting, a nutrient grouting layer with the thickness of 45cm is formed; and forming a vegetation layer on the surface of the slag stone slope after spray seeding, wherein the vegetation layer is an arbor and shrub herb plant community layer because the spray-seeded mixed seeds are arbor and shrub herb mixed seeds.

Examples 2 to 6

The method for restoring the ecology of the side slope in the embodiment 2-6 is different from the embodiment 1 in that the grouting mixture is prepared respectively from the preparation example I-2 to the preparation example I-6 in sequence, and the rest is the same as the embodiment 1.

Examples 7 to 8

The method for restoring ecological slope in example 7-8 is different from example 6 in that grass seed mixtures were prepared in the following steps of preparation example II-2 to preparation example II-3, respectively, and the rest steps were the same as example 6.

Comparative example

Comparative example 1

The slope ecological restoration method is different from the slope ecological restoration method in the embodiment 1 in that the injection depth of the grouting mixture is 30cm, and the rest is the same as that in the embodiment 1.

Comparative example 2

The ecological slope restoring method is different from that in the embodiment 1 in that the injection depth of the grouting mixture is 60cm, and the rest is the same as that in the embodiment 1.

Comparative example 3

The method for restoring the ecology of the side slope is different from the method in the embodiment 1 in that trees and shrubs are not planted, and the rest is the same as the method in the embodiment 1.

Comparative example 4

The slope ecological restoration method is different from the method in the embodiment 1 in that the adding amount of water in a grouting mixture is 850kg, and the rest is the same as the method in the embodiment 1.

Comparative example 5

The method for restoring the ecology of the side slope is different from the method in the embodiment 1 in that the adding amount of water in a grouting mixture is 1150kg, and the rest is the same as that in the embodiment 1.

Comparative example 6

A method for restoring ecology in a side slope, which is different from example 1 in that grass fiber is not added to a grass seed mixture, and the rest is the same as example 1.

Performance test

The following properties of the repaired side slope in examples 1-8 and comparative examples 1-6 were tested by simulating the side slope, the size of the simulated side slope was 5m × 5m, the slope ratio was 0.9. The test is carried out in the open air without long-time heavy rainfall.

The plant coverage rate of the repaired slopes of 30d, 60d and 90d in examples 1 to 8 and comparative examples 1 to 6 is detected;

detecting soil erosion amount of the side slope at 30d, 60d and 90d after the repair in the embodiments 1-8 and the comparative examples 1-6, wherein the detection method comprises the steps of collecting slag of the side slope body every 30d, drying, calculating the ratio of the mass of the slag to the initial mass, and further calculating to obtain the soil erosion amount;

the survival rate of the plants on the repaired slopes of examples 1 to 8 and comparative examples 1 to 6 was measured at 30 days, and the results are shown in table 1.

TABLE 1 test results

As can be seen from table 1, after the slope ecological restoration method in the present application, the vegetation coverage and the plant survival rate of the slope are high, and the soil erosion rate is low. Wherein the 30d vegetation coverage of the repaired side slope is 54.6-56.2%; the vegetation coverage rate range of 60d is 86.7-88.7%; the 90d vegetation coverage range is 99.1-100%; the soil erosion rate range of 30d is 3.0-4.0%; the soil erosion rate range is 4.1-5.1% in 60 d; the soil erosion rate range of 90d is 4.8-5.9%; the range of the survival rate of the plants is 74.1-75.9%. According to the slope ecological restoration method, the slope stability and the water and soil loss resistance are obviously improved through the mutual synergistic action among the steps, the mutual synergistic action among the raw materials in the grouting mixture and the mutual synergistic action among the raw materials in the grass seed mixture, the vegetation ground conditions of the restored slope are excellent, the plant survival rate and the plant coverage rate are high, and the social development requirements are met.

Comparing the comparative example 1 with the example 1, wherein after the slope ecological restoration method is adopted in the comparative example 1, the 30d vegetation coverage of the restored slope is 47.2%; the vegetation coverage rate is 76.4 percent in 60 d; the 90d vegetation coverage is 84.6%; the soil erosion rate is 8.4% in 30 d; the soil erosion rate is 11.6% in 60 d; the 90d soil erosion rate is 17.6%; the survival rate of the plants is 63.5 percent. After the ecological slope restoration method in the embodiment 1, the 30d vegetation coverage of the restored slope is 54.6%; the vegetation coverage rate is 86.7 percent in 60 d; the 90d vegetation coverage rate is 99.1%; the soil erosion rate is 4.0% in 30 d; the soil erosion rate is 5.1% in 60 d; the 90d soil erosion rate is 5.9%; the survival rate of the plants is 74.1 percent. Through comparison, the vegetation coverage rate and the plant survival rate of the restored side slope are reduced and the soil erosion rate is increased after the side slope ecological restoration method in the comparative example 1 is adopted. Compared with the example 1, the injection depth of the grouting mixture in the comparative example 1 is 30cm, the stability of the slope body is reduced due to the reduction of the thickness of the nutrient grouting layer, the soil erosion rate is increased, and the plant survival rate and the vegetation coverage rate are further reduced.

Comparing the comparative example 2 with the example 1, wherein after the slope ecological restoration method is adopted in the comparative example 2, the 30d vegetation coverage rate of the restored slope is 48.1%; the vegetation coverage rate of 60d is 77.2 percent; the 90d vegetation coverage rate is 85.8%; the soil erosion rate is 4.8% in 30 d; the soil erosion rate is 6.0% in 60 d; the 90d soil erosion rate is 7.1%; the survival rate of the plants is 65.6 percent. After the slope ecological restoration method in the embodiment 1, the 30d vegetation coverage of the restored slope is 54.6 percent; the vegetation coverage rate is 86.7 percent in 60 d; the 90d vegetation coverage rate is 99.1%; the soil erosion rate is 4.0% in 30 d; the soil erosion rate is 5.1% in 60 d; the 90d soil erosion rate is 5.9%; the survival rate of the plants is 74.1 percent. By comparison, the slope ecological restoration method in the comparative example 2 shows that the vegetation coverage rate and the plant survival rate of the restored slope are both reduced, and the soil erosion rate is increased. Compared with the embodiment 1, the injection depth of the grouting mixture in the comparative example 2 is 60cm, the stability of a slope body is reduced due to the increase of the thickness of the nutrient grouting layer, the soil erosion rate is increased, and the plant survival rate and the vegetation coverage rate are reduced.

Comparing the comparative example 3 with the example 1, the 30d vegetation coverage of the repaired side slope is 47.9% after the side slope ecological restoration method is carried out in the comparative example 3; the vegetation coverage rate of 60d is 77.2 percent; the 90d vegetation coverage is 85.1%; the soil erosion rate is 7.2% in 30 d; the soil erosion rate is 10.0% in 60 d; the 90d soil erosion rate is 15.7%; the survival rate of the plants is 66.6 percent. After the ecological slope restoration method in the embodiment 1, the 30d vegetation coverage of the restored slope is 54.6%; the vegetation coverage rate is 86.7 percent in 60 d; the 90d vegetation coverage rate is 99.1%; the soil erosion rate is 4.0% in 30 d; the soil erosion rate is 5.1% in 60 d; the 90d soil erosion rate is 5.9%; the survival rate of the plants is 74.1 percent. By comparison, the vegetation coverage rate and the plant survival rate of the restored slope are both reduced and the soil erosion rate is increased after the slope ecological restoration method in the comparative example 3. Compared with example 1, trees and shrubs are not planted in comparative example 3, so that the stability of the slope body is reduced, the soil erosion rate is increased, and the plant survival rate and the vegetation coverage rate are further reduced.

Comparing the comparative example 4 with the example 1, wherein the 30d vegetation coverage of the repaired side slope is 49.2% after the side slope ecological restoration method is adopted in the comparative example 4; the vegetation coverage rate is 79.4 percent in 60 d; the 90d vegetation coverage is 87.6 percent; the soil erosion rate is 4.8% in 30 d; the soil erosion rate is 6.1% in 60 d; the 90d soil erosion rate is 7.2%; the survival rate of the plants is 68.1 percent. After the slope ecological restoration method in the embodiment 1, the 30d vegetation coverage of the restored slope is 54.6 percent; the vegetation coverage rate is 86.7% in 60 d; the 90d vegetation coverage rate is 99.1%; the soil erosion rate is 4.0% in 30 d; the soil erosion rate is 5.1% in 60 d; the 90d soil erosion rate is 5.9%; the survival rate of the plants is 74.1 percent. It can be seen by comparison that after the slope ecological restoration method in the comparative example 4, the vegetation coverage and the plant survival rate of the restored slope are both reduced, and the soil erosion rate is increased. Compared with the embodiment 1, the addition amount of water in the grouting mixture in the comparative example 4 is 850kg, the stability of the side slope is reduced due to the reduction of the water content in the grouting mixture, the soil erosion rate is increased, the nutrient supply environment provided by the side slope for the growth of later-stage vegetation is deteriorated, and the plant survival rate and the vegetation coverage rate are further reduced.

Comparing the comparative example 5 with the example 1, wherein the 30d vegetation coverage of the repaired side slope is 50.0% after the side slope ecological restoration method is adopted in the comparative example 5; the vegetation coverage rate is 80.5% in 60 d; the 90d vegetation coverage is 88.8%; the soil erosion rate is 4.7% in 30 d; the soil erosion rate is 5.8% in 60 d; the soil erosion rate is 7.0% after 90 d; the survival rate of the plants is 69.4 percent. After the slope ecological restoration method in the embodiment 1, the 30d vegetation coverage of the restored slope is 54.6 percent; the vegetation coverage rate is 86.7% in 60 d; the 90d vegetation coverage rate is 99.1%; the soil erosion rate is 4.0% in 30 d; the soil erosion rate is 5.1% in 60 d; the soil erosion rate is 5.9% after 90 d; the survival rate of the plants is 74.1 percent. By comparison, the slope ecological restoration method in the comparative example 5 shows that the vegetation coverage rate and the plant survival rate of the restored slope are both reduced, and the soil erosion rate is increased. Compared with example 1, the addition amount of water in the grouting mixture in the comparative example 5 is 1150kg, the stability of the slope body of the side slope is reduced due to the increase of the content of water in the grouting mixture, the soil erosion rate is increased, the nutrient supply environment provided by the side slope for the growth of vegetation in the later period is deteriorated, and the plant survival rate and the vegetation coverage rate are further reduced.

Comparing the comparative example 6 with the example 1, wherein after the slope ecological restoration method is adopted in the comparative example 6, the 30d vegetation coverage of the restored slope is 31.0 percent; the vegetation coverage rate is 62.2% in 60 d; the 90d vegetation coverage rate is 70.3%; the soil erosion rate is 16.7% in 30 d; the soil erosion rate is 23.26% in 60 d; the 90d soil erosion rate is 37.1%; the survival rate of the plants is 47.1 percent. After the slope ecological restoration method in the embodiment 1, the 30d vegetation coverage of the restored slope is 54.6 percent; the vegetation coverage rate is 86.7 percent in 60 d; the 90d vegetation coverage rate is 99.1%; the soil erosion rate is 4.0% in 30 d; the soil erosion rate is 5.1% in 60 d; the soil erosion rate is 5.9% after 90 d; the survival rate of the plants is 74.1 percent. It can be seen by comparison that after the slope ecological restoration method in the comparative example 6, the vegetation coverage and the plant survival rate of the restored slope are both reduced, and the soil erosion rate is increased. Compared with the example 1, the grass seed mixture in the comparative example 6 is not added with grass fiber, so that the stability of a slope body is reduced, the soil erosion rate is increased, and the survival rate of plants and the vegetation coverage rate are further reduced.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. The side slope ecological restoration method is characterized by being applied to a side slope with a slope ratio of less than or equal to 1, and comprising the following steps:

3) Grouting: injecting and filling a grouting mixture into the slope body of the side slope, wherein the injection depth of the grouting mixture in the slope body of the side slope is 40-50cm, so as to form a nutrient grouting layer with the thickness of 40-50 cm;

4) Backfilling planting holes: filling the planting holes with planting soil;

6) Planting: planting trees and shrubs in the planting holes;

2. The method for ecologically restoring a side slope according to claim 1, wherein the planting holes are distributed on the slope body of the side slope in a rectangular array.

3. The method for restoring ecology of side slopes according to claim 1, wherein the organic fertilizer is decomposed farmyard manure.

4. The slope ecological restoration method according to claim 1, wherein the microbial agent is a mixture of trichoderma harzianum and bacillus subtilis.

5. The ecological slope restoration method according to claim 1, wherein the grain size of the planting soil is less than or equal to 3cm.

6. The ecological slope restoration method according to claim 1, wherein the raw materials of the grouting mixture further comprise 6-8 parts by weight of gamma cyclodextrin.

7. The ecological slope restoration method according to claim 1, wherein the length of the grass fiber is 3-5cm.

8. The ecological slope restoration method according to claim 1, wherein the grass seed mixture further comprises 3-6 parts by weight of hydroxypropyl methylcellulose in the raw materials.

9. The ecological slope restoration method according to claim 1, wherein the binder is portland cement.