A method for ecological restoration of a slope

Abstract

The application discloses a kind of slope ecological restoration methods, it is related to ecological restoration technical field.Slope ecological restoration method is applied to the slope of slope ratio ≤1:1, this method includes the following steps: cleaning the slope surface of slope to make slope surface even;Uniformly dig multiple depth 25-35cm planting hole on the slope body of slope;To the slope body of slope, inject grout mixture;Planting soil is filled in the planting hole;Grass seed mixture is sprayed on the surface of the slope body of slope;Grass seed mixture includes the following raw materials: water, planting soil, organic fertilizer, microbial inoculant, grass fiber, mixed seed, water-retaining agent, binder;Planting arbor shrub in planting hole;Non-woven fabric is covered on the surface of vegetation layer, and water is maintained.The slope ecological restoration method of the application has the advantages of low cost, short construction period and excellent repair effect.

Description

Technical Field

[0001] The present application relates to the field of ecological restoration technology, and more specifically, to a slope ecological restoration method. Background Art

[0002] Mineral mining, road construction and other infrastructure construction are prone to form loosely structured slopes, which refer to slopes with a certain slope. The above-mentioned slopes are at risk of collapse and landslide when rainwater infiltrates during the rainy season or is disturbed by external forces. In addition, during the dry season, the slopes are in a permeable state, and the roots of the vegetation are always in a state of water and nutrient deficiency, which makes the vegetation on the slopes easily degraded or even withered. Currently, the hanging net spraying method is usually used to carry out ecological restoration of slopes formed by abandoned slag and soil. Hanging net spraying is a comprehensive environmental protection technology that integrates disciplines such as rock mechanics, soil science, biology, fertilizer science, horticulture, and ecology. Hanging net spraying is a technology that first fixes the mesh on the slope to strengthen the slope structure, and then sprays soil, fertilizer, organic matter, plant seeds and other base materials to form a planting matrix with a certain thickness on the slope that allows plants to grow.

[0003] However, conventional net-based spraying is expensive and time-consuming to perform ecological restoration on slopes. Therefore, it is urgent to develop a slope ecological restoration method with excellent restoration effects, low cost, and short construction period. Summary of the Invention

[0004] In order to improve the ecological restoration effect of slopes, reduce the cost of slope ecological restoration, and shorten the construction period of slope ecological restoration, this application provides a slope ecological restoration method using the following technical solutions:

[0005] A slope ecological restoration method is applied to slopes with a slope ratio of ≤1:1. The slope ecological restoration method comprises the following steps:

[0006] 1) Slope cleaning: clean the slope surface to make it smooth;

[0007] 2) Digging planting holes: dig multiple planting holes with a depth of 25-35 cm evenly on the slope;

[0008] 3) Grouting: injecting a grouting mixture into the slope of the side slope, wherein the grouting mixture is injected into the slope of the side slope to a depth of 40-50 cm to form a nutrient grouting layer with a thickness of 40-50 cm;

[0009] 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 parts of microbial agent;

[0010] 4) Backfilling the planting hole: filling the planting hole with planting soil;

[0011] 5) Spraying: Spraying the grass seed mixture on the slope surface to form a vegetation layer with a thickness of 1.5-3.5 cm;

[0012] 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 parts of microbial agent, 25-30 parts of grass fiber, 1.2-1.5 parts of mixed seeds, 0.25-0.3 parts of water retaining agent, and 0.35-0.4 parts of binder;

[0013] 6) Planting: Planting trees and shrubs in the planting holes;

[0014] 7) Maintenance: Cover the surface of the vegetation layer with non-woven fabric and sprinkle water for maintenance.

[0015] By adopting the above technical solution, the slope ecological restoration method of the present application has a 30-day vegetation coverage rate of 54.6-56.2%; a 60-day vegetation coverage rate of 86.7-88.7%; a 90-day vegetation coverage rate of 99.1-100%; a 30-day soil erosion rate of 3.0-4.0%; a 60-day soil erosion rate of 4.1-5.1%; a 90-day soil erosion rate of 4.8-5.9%; and a plant survival rate of 74.1-75.9%. The slope ecological restoration method of the present application significantly improves the plant survival rate and plant coverage rate of the slope and reduces the soil erosion rate through the mutual synergy between the various steps, the mutual synergy between the various raw materials in the grouting mixture, and the mutual synergy between the various raw materials in the grass seed mixture. In addition, the slope ecological restoration method of the present application has a short construction period and a low cost, which meets the needs of social development.

[0016] The slope ecological restoration method in the present application is suitable for slopes with a slope ratio of ≤1:1. The slope with a slope ratio of ≤1:1 has a relatively gentle slope, which makes the subsequent spraying substrate adsorbed on the slope more stable and not easy to slip. In addition, before spraying, the slope body of the slope is first filled with a grouting mixture, so that the slope stability of the slope is enhanced and the resistance to soil and water loss is improved. At the same time, by adding grass fibers to the grass seed mixture, the grass fibers can fix the vegetation layer to the slope surface of the slope, so that the slope ecological restoration method in the present application has an excellent restoration effect without the need for netting. In addition, the amount of base material used for spraying is small, and the thickness of the vegetation layer formed after spraying is small, which helps to reduce the cost of slope repair. Moreover, the slope ecological restoration method in the present application does not require conventional netting operations, so it can reduce the material costs and machinery and labor costs used in the netting process, which can further reduce the cost of slope repair. In addition, the slope ecological restoration method in this application does not require conventional netting operations and can also shorten the construction period, so that the construction period of the slope ecological restoration method is about one-third of the construction period of slope repair through netting spraying.

[0017] Furthermore, the slope ecological restoration method disclosed in this application sprays the grass seed mixture onto the slope surface in one go, forming a vegetation layer. This eliminates the need for separate spraying of the substrate and grass seeds, as with conventional net spraying methods, thus shortening the construction period. Furthermore, the mixed seed, substrate, binder, and water-retaining agent are evenly mixed and then sprayed onto the slope surface, enhancing the stability of the mixed seed on the slope surface and preventing it from escaping. This helps improve the slope's stability and resistance to soil and water erosion, while also increasing the slope's vegetation coverage and plant survival rate.

[0018] Optionally, the planting holes are distributed in a rectangular array on the slope.

[0019] By adopting the above technical solution, trees and shrubs can be evenly distributed on the slope after being planted in the planting holes, which helps to further improve the stability of the slope.

[0020] Optionally, the organic fertilizer is decomposed farmyard manure.

[0021] By adopting the above technical solutions, the slope can provide a long-term nutrient supply environment for the subsequent vegetation growth, thereby improving the vegetation coverage rate and plant survival rate of the slope.

[0022] Optionally, the microbial agent is a mixture of Trichoderma harzianum and Bacillus subtilis.

[0023] By adopting the above technical solution, Trichoderma harzianum and Bacillus subtilis work together to further improve the fertility of the slope, provide a long-term nutrient supply environment for the subsequent vegetation growth, and increase vegetation coverage and plant survival rate.

[0024] Optionally, the particle size of the planting soil is less than or equal to 3 cm.

[0025] By adopting the above technical solution, the particle size of the planting soil is smaller, which helps to improve the adhesion of the planting soil, enhance the stability of the slope, and help plants absorb nutrients in the planting soil, thereby improving the survival rate of plants.

[0026] Optionally, the raw materials of the grouting mixture further include 6-8 parts of gamma-cyclodextrin in parts by weight.

[0027] By adopting the above technical solution, the addition of gamma-cyclodextrin can not only improve the compatibility between the raw materials in the grouting mixture and improve the permeability of the grouting mixture, but also further enhance the reinforcement effect of the grouting mixture on the slope and improve the stability of the slope.

[0028] Optionally, the length of the grass fiber is 3-5 cm.

[0029] Optionally, the raw materials of the grass seed mixture further include 3-6 parts of hydroxypropyl methylcellulose.

[0030] By adopting the above technical solution, hydroxypropyl methylcellulose has excellent film-forming properties, which can not only improve the stability of the slope and reduce the soil erosion rate, but also improve soil fertility, plant survival rate and vegetation coverage.

[0031] Optionally, the binder is silicate cement.

[0032] By adopting the above technical solution, silicate cement can significantly improve the bonding force between the vegetation layer and the slope surface, making the vegetation layer less likely to slip and having strong resistance to soil and water erosion.

[0033] In summary, this application has at least the following beneficial effects:

[0034] 1. The slope ecological restoration method in this application reduces the cost of slope ecological restoration and shortens the construction period of slope ecological restoration through the synergistic effect between various steps, and has excellent restoration effects;

[0035] 2. By adding gamma-cyclodextrin to the grouting mixture, the soil erosion rate of the slope is further reduced, and the vegetation coverage and plant survival rate of the slope are improved;

[0036] 3. By adding hydroxypropyl methylcellulose to the grass seed mixture, the soil erosion rate of the slope is further reduced, and the vegetation coverage rate and plant survival rate of the slope are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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 present application.

[0038] Figure 1 Schematic diagram of the repaired slope structure provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below with reference to the examples.

[0040] raw material

[0041] Wood ash organic fertilizer, the active ingredient is potassium carbonate, the effective content is 99%, and it is sourced from natural plants; superphosphate compound fertilizer, the model is agricultural grade, the total phosphorus content is ≥12%; Trichoderma harzianum, the dosage form is powder, the effective content is 5 billion, and the moisture content is 10%; Bacillus subtilis, the dosage form is powder, the effective substance content is 98%, and the culture temperature is 37°C; hydroxypropyl methylcellulose, the model is food grade, the content is 52%, and the effective substance content is 99%; decomposed farmyard manure, the ingredients are fermented and decomposed animal manure, the organic matter content is ≥45%, the nitrogen, phosphorus and potassium content is ≥5%, and the moisture content is ≤30%; γ-cyclodextrin, selected from Xi'an Xinweihe Organic Biotechnology Co., Ltd.; silicate cement is slag silicate cement, the initial setting time is 3.2h, and it is selected from Fenghaohua Industrial Salt Sales Office in Yuhong District, Shenyang City.

[0042] Preparation Example

[0043] Preparation Example 1

[0044] Preparation Example I-1

[0045] A grouting mixture is prepared by the following method:

[0046] The planting soil was passed through a 4.0 cm sieve, and then 1100 kg of the sieved planting soil was evenly mixed with 1050 kg of water to obtain a mixture; then 60 kg of organic fertilizer, 2.5 kg of compound fertilizer and 0.01 kg of microbial agent were added to the mixture and stirred for 30 minutes to obtain a grouting mixture;

[0047] Among them, the organic fertilizer is wood ash organic fertilizer; the compound fertilizer is superphosphate compound fertilizer; and the microbial agent is Bacillus subtilis.

[0048] Preparation Example I-2

[0049] A grouting mixture is provided, which differs from Preparation Example I-1 in that the organic fertilizer is an equal amount of decomposed farmyard manure, and the rest is the same as Preparation Example I-1.

[0050] Preparation Example I-3

[0051] A grouting mixture, which differs from Preparation Example I-2 in that the microbial agent is an equal amount of Trichoderma harzianum, and the rest is the same as Preparation Example I-2.

[0052] Preparation Example I-4

[0053] A grouting mixture, which differs from Preparation Example 1-2 in that the microbial agent is a mixture of equal amounts of Trichoderma harzianum and Bacillus subtilis, and the mass ratio of Trichoderma harzianum to Bacillus subtilis is 1:1, and the rest is the same as Preparation Example 1-2.

[0054] Preparation Example I-5

[0055] A grouting mixture, which differs from Preparation Example I-4 in that its raw materials also include 6 kg of γ-cyclodextrin, and during the preparation of the grouting mixture, γ-cyclodextrin is added to the mixture together with organic fertilizer, compound fertilizer and microbial agent, and the rest are the same as Preparation Example I-4.

[0056] Preparation Example I-6

[0057] A grouting mixture is provided, which differs from Preparation Example I-5 in that the planting soil is passed through a 3.0 cm sieve, and the rest is the same as Preparation Example I-5.

[0058] Preparation Example II

[0059] Preparation Example II-1

[0060] A grass seed mixture is prepared by the following method:

[0061] 1050 kg of water and 1500 kg of planting soil passed through a 3.0 cm sieve were mixed evenly, 25 kg of grass fiber was added under stirring, followed by 28 kg of organic fertilizer and 0.01 kg of microbial agent, and the mixture was stirred until uniformly mixed, and then 1.3 kg of mixed seeds was added and stirred for 15 minutes to obtain a premix; 0.25 kg of water retaining agent and 0.35 kg of binder were added to the premix under stirring;

[0062] Among them, the length of the grass fiber is 3-5cm, and the material is rice straw; the organic fertilizer is decomposed farmyard manure; the microbial agent is a mixture of Trichoderma harzianum and Bacillus subtilis with a mass ratio of 1:1.2; the mixed seeds are mixed seeds of trees, shrubs, grasses and flowers; the water-retaining agent is a potassium salt-type water-retaining agent for rooting powder hydroponic plants; the adhesive product number is FMN-95, and it is selected from Guangxi Zhongxing Ecological Garden Co., Ltd., with an active ingredient content of 98%.

[0063] Preparation Example II-2

[0064] A grass seed mixture is different from Preparation Example II-1 in that the binder is an equal amount of Portland cement, and the rest is the same as Preparation Example II-1.

[0065] Preparation Example II-3

[0066] A grass seed mixture is different from Preparation Example II-2 in that the raw materials of the grass seed mixture also include 4 kg of hydroxypropyl methylcellulose, and during the preparation of the grass seed mixture, hydroxypropyl methylcellulose is added to the premix simultaneously with the water-retaining agent and the binder. The rest is the same as Preparation Example II-2.

[0067] Example

[0068] Example 1

[0069] A slope ecological restoration method comprises the following steps:

[0070] 1) Slope cleaning: clean the slope surface to make it smooth;

[0071] 2) Digging planting holes: Dig multiple planting holes with a depth of 30 cm evenly on the slope at intervals of 1.5 m x 1.5 m. The planting holes are distributed in a rectangular array on the slope.

[0072] 3) Grouting: Filling the slope with a grouting mixture to a depth of 45 cm to form a nutrient grouting layer with a thickness of 45 cm. The grouting mixture was prepared according to Preparation Example I-1.

[0073] 4) Backfill the planting hole: fill the planting hole with planting soil;

[0074] 5) Spraying: Spraying a grass seed mixture on the slope surface to form a vegetation layer with a thickness of 2 cm. The grass seed mixture was prepared according to Preparation Example II-1.

[0075] 6) Planting: Plant trees and shrubs in the planting holes;

[0076] 7) Maintenance: Cover the surface of the vegetation layer with non-woven fabric and sprinkle water for maintenance;

[0077] Among them, the slope structure after being repaired by slope ecological restoration method is as follows Figure 1 As shown, the slope is a slag dump slope. The slope ratio of the slag dump slope is 0.9:1. There are multiple planting holes distributed on the surface of the slag slope, and trees and shrubs are planted in the planting holes. After grouting, a nutrient grouting layer with a thickness of 45 cm is formed on the slag slope. After spraying, a vegetation layer is formed on the surface of the slag slope. Since the mixed seeds sprayed are mixed seeds of trees, shrubs, grasses and flowers, this vegetation layer is a tree, shrub, flower and grass plant community layer.

[0078] Examples 2-6

[0079] The slope ecological restoration method of Examples 2-6 is different from that of Example 1 in that the grouting mixtures are prepared in sequence from Preparation Example I-2 to Preparation Example I-6, and the rest are the same as in Example 1.

[0080] Examples 7-8

[0081] The slope ecological restoration method of Example 7-8 is different from that of Example 6 in that the grass seed mixture is prepared in sequence from Preparation Example II-2 to Preparation Example II-3, and the rest is the same as that of Example 6.

[0082] Comparative Example

[0083] Comparative Example 1

[0084] A slope ecological restoration method is provided, which differs from Example 1 in that the injection depth of the grouting mixture is 30 cm, and the rest is the same as Example 1.

[0085] Comparative Example 2

[0086] A slope ecological restoration method is provided, which differs from Example 1 in that the injection depth of the grouting mixture is 60 cm, and the rest is the same as Example 1.

[0087] Comparative Example 3

[0088] A slope ecological restoration method is provided, which differs from Example 1 in that no trees or shrubs are planted, and the rest is the same as Example 1.

[0089] Comparative Example 4

[0090] A slope ecological restoration method is provided, which differs from Example 1 in that the amount of water added to the grouting mixture is 850 kg, and the rest is the same as Example 1.

[0091] Comparative Example 5

[0092] A slope ecological restoration method is provided, which differs from Example 1 in that the amount of water added to the grouting mixture is 1150 kg, and the rest is the same as Example 1.

[0093] Comparative Example 6

[0094] A slope ecological restoration method is provided, which differs from Example 1 in that no grass fiber is added to the grass seed mixture, and the rest is the same as Example 1.

[0095] Performance testing

[0096] The following properties of the repaired slopes in Examples 1-8 and Comparative Examples 1-6 were tested using simulated slopes. The simulated slopes were 5m x 5m in size, with a slope ratio of 0.9:1 and paved with tailings slag. These performance tests began on February 10, 2021, and were conducted outdoors without prolonged heavy rainfall.

[0097] The plant coverage of the slopes after repair in Examples 1-8 and Comparative Examples 1-6 was detected at 30 days, 60 days, and 90 days;

[0098] The soil erosion amount of the repaired slopes in Examples 1-8 and Comparative Examples 1-6 was detected at 30 days, 60 days, and 90 days. The detection method was to collect the slag from the slope every 30 days, dry it, calculate the ratio of its mass to the initial mass, and then calculate the soil erosion amount;

[0099] The survival rates of plants on the repaired slopes in Examples 1-8 and Comparative Examples 1-6 were tested at 30 days. The test results are shown in Table 1.

[0100] Table 1 Test results

[0101]

[0102] As shown in Table 1, after applying the slope ecological restoration method described in this application, the slope's vegetation coverage and plant survival rate were high, while the soil erosion rate was low. Specifically, the 30-day vegetation coverage of the restored slope ranged from 54.6% to 56.2%; the 60-day vegetation coverage ranged from 86.7% to 88.7%; and the 90-day vegetation coverage ranged from 99.1% to 100%. The 30-day soil erosion rate ranged from 3.0% to 4.0%; the 60-day soil erosion rate ranged from 4.1% to 5.1%; and the 90-day soil erosion rate ranged from 4.8% to 5.9%. The plant survival rate ranged from 74.1% to 75.9%. The slope ecological restoration method in the present application significantly improves the stability of the slope and the resistance to soil and water loss through the mutual synergy between the various steps, the mutual synergy between the various raw materials in the grouting mixture, and the mutual synergy between the various raw materials in the grass seed mixture, and makes the vegetation site conditions of the repaired slope excellent, with a high plant survival rate and plant coverage rate, which meets the needs of social development.

[0103] Comparing Comparative Example 1 with Example 1, after the slope ecological restoration method in Comparative Example 1, the vegetation coverage rate of the repaired slope was 47.2% at 30 days, 76.4% at 60 days, and 84.6% at 90 days; the soil erosion rate at 30 days was 8.4%; the soil erosion rate at 60 days was 11.6%; the soil erosion rate at 90 days was 17.6%; and the plant survival rate was 63.5%. After the slope ecological restoration method in Example 1, the vegetation coverage rate of the repaired slope was 54.6% at 30 days, 86.7% at 60 days, and 99.1% at 90 days; the soil erosion rate at 30 days was 4.0%; the soil erosion rate at 60 days was 5.1%; the soil erosion rate at 90 days was 5.9%; and the plant survival rate was 74.1%. Comparison shows that after the slope ecological restoration method in Comparative Example 1, the vegetation coverage and plant survival rate of the repaired slope decreased, while the soil erosion rate increased. Compared with Example 1, the injection depth of the grouting mixture in Comparative Example 1 was 30 cm. The reduced thickness of the nutrient grouting layer reduced slope stability and increased soil erosion, further reducing plant survival rate and vegetation coverage.

[0104] Comparing Comparative Example 2 with Example 1, after the slope ecological restoration method in Comparative Example 2, the vegetation coverage rate of the repaired slope was 48.1% at 30 days, 77.2% at 60 days, and 85.8% at 90 days. The soil erosion rate at 30 days was 4.8%, 6.0% at 60 days, and 7.1% at 90 days. The plant survival rate was 65.6%. After the slope ecological restoration method in Example 1, the vegetation coverage rate of the repaired slope was 54.6% at 30 days, 86.7% at 60 days, and 99.1% at 90 days. The soil erosion rate at 30 days was 4.0%, 5.1% at 60 days, and 5.9% at 90 days. The plant survival rate was 74.1%. Comparison shows that after the slope ecological restoration method in Comparative Example 2, the vegetation coverage and plant survival rate of the repaired slope decreased, while the soil erosion rate increased. Compared with Example 1, the injection depth of the grouting mixture in Comparative Example 2 was 60 cm. The increased thickness of the nutrient grouting layer resulted in a decrease in slope stability, an increase in soil erosion, and a decrease in plant survival rate and vegetation coverage.

[0105] Comparing Comparative Example 3 with Example 1, after the slope ecological restoration method in Comparative Example 3, the vegetation coverage rate of the repaired slope was 47.9% at 30 days, 77.2% at 60 days, and 85.1% at 90 days; the soil erosion rate at 30 days was 7.2%; the soil erosion rate at 60 days was 10.0%; the soil erosion rate at 90 days was 15.7%; and the plant survival rate was 66.6%. After the slope ecological restoration method in Example 1, the vegetation coverage rate of the repaired slope was 54.6% at 30 days, 86.7% at 60 days, and 99.1% at 90 days; the soil erosion rate at 30 days was 4.0%; the soil erosion rate at 60 days was 5.1%; the soil erosion rate at 90 days was 5.9%; and the plant survival rate was 74.1%. Comparison shows that after the slope ecological restoration method in Comparative Example 3, the vegetation coverage and plant survival rate of the repaired slope decreased, while the soil erosion rate increased. Compared with Example 1, the lack of tree and shrub planting in Comparative Example 3 resulted in decreased slope stability, increased soil erosion, and further decreased plant survival rate and vegetation coverage.

[0106] Comparing Comparative Example 4 with Example 1, after the slope ecological restoration method in Comparative Example 4 was used, the vegetation coverage rate of the repaired slope was 49.2% at 30 days, 79.4% at 60 days, and 87.6% at 90 days. The soil erosion rate at 30 days was 4.8%, 6.1% at 60 days, and 7.2% at 90 days. The plant survival rate was 68.1%. After the slope ecological restoration method in Example 1 was used, the vegetation coverage rate of the repaired slope was 54.6% at 30 days, 86.7% at 60 days, and 99.1% at 90 days. The soil erosion rate at 30 days was 4.0%, 5.1% at 60 days, and 5.9% at 90 days. The plant survival rate was 74.1%. Comparison shows that after the slope ecological restoration method in Comparative Example 4, the vegetation coverage and plant survival rate of the repaired slope decreased, while the soil erosion rate increased. Compared to Example 1, the amount of water added to the grouting mixture in Comparative Example 4 was 850 kg. The reduced water content in the grouting mixture resulted in decreased slope stability, increased soil erosion rate, and a poorer nutrient supply environment for later vegetation growth, further reducing plant survival rate and vegetation coverage.

[0107] Comparing Comparative Example 5 with Example 1, after the slope ecological restoration method in Comparative Example 5 was used, the vegetation coverage rate of the repaired slope was 50.0% at 30 days, 80.5% at 60 days, and 88.8% at 90 days. The soil erosion rate at 30 days was 4.7%, 5.8% at 60 days, and 7.0% at 90 days. The plant survival rate was 69.4%. After the slope ecological restoration method in Example 1 was used, the vegetation coverage rate of the repaired slope was 54.6% at 30 days, 86.7% at 60 days, and 99.1% at 90 days. The soil erosion rate at 30 days was 4.0%, 5.1% at 60 days, and 5.9% at 90 days. The plant survival rate was 74.1%. Comparison shows that after the slope ecological restoration method in Comparative Example 5, the vegetation coverage and plant survival rate of the repaired slope decreased, while the soil erosion rate increased. Compared to Example 1, the amount of water added to the grouting mixture in Comparative Example 5 was 1150 kg. The increased water content in the grouting mixture reduced the stability of the slope, increased the soil erosion rate, and deteriorated the nutrient supply environment provided by the slope for subsequent vegetation growth, further reducing the plant survival rate and vegetation coverage.

[0108] Comparing Comparative Example 6 with Example 1, after the slope ecological restoration method in Comparative Example 6 was used, the vegetation coverage rate of the repaired slope was 31.0% at 30 days, 62.2% at 60 days, and 70.3% at 90 days. The soil erosion rate at 30 days was 16.7%, 23.26% at 60 days, and 37.1% at 90 days. The plant survival rate was 47.1%. After the slope ecological restoration method in Example 1 was used, the vegetation coverage rate of the repaired slope was 54.6% at 30 days, 86.7% at 60 days, and 99.1% at 90 days. The soil erosion rate at 30 days was 4.0%, 5.1% at 60 days, and 5.9% at 90 days. The plant survival rate was 74.1%. Comparison shows that after the slope ecological restoration method in Comparative Example 6, the vegetation coverage and plant survival rate of the repaired slope decreased, while the soil erosion rate increased. Compared with Example 1, the grass seed mixture in Comparative Example 6 did not include grass fiber, which led to decreased slope stability, increased soil erosion, and further decreased plant survival rate and vegetation coverage.

[0109] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as such modifications are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A slope ecological restoration method, characterized in that: Applied to slopes with a slope ratio of ≤1:1, the slope ecological restoration method includes the following steps: 1) Slope cleaning: clean the slope surface to make it smooth; 2) Digging planting holes: dig multiple planting holes with a depth of 25-35 cm evenly on the slope; 3) Grouting: injecting a grouting mixture into the slope of the side slope, wherein the grouting mixture is injected into the slope of the side slope to a depth of 40-50 cm to form a nutrient grouting layer with a 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 parts of microbial agent; 4) Backfilling the planting hole: filling the planting hole with planting soil; 5) Spraying: Spraying the grass seed mixture on the slope surface to form a vegetation layer with a 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 parts of microbial agent, 25-30 parts of grass fiber, 1.2-1.5 parts of mixed seeds, 0.25-0.3 parts of water retaining agent, and 0.35-0.4 parts of binder; 6) Planting: Planting trees and shrubs in the planting holes; 7) Maintenance: Cover the surface of the vegetation layer with non-woven fabric and sprinkle water for maintenance.

2. A slope ecological restoration method according to claim 1, characterized in that: The planting holes are distributed in a rectangular array on the slope.

3. A slope ecological restoration method according to claim 1, characterized in that: The organic fertilizer is decomposed farmyard manure.

4. A slope ecological restoration method according to claim 1, characterized in that: The microbial agent is a mixture of Trichoderma harzianum and Bacillus subtilis.

5. A slope ecological restoration method according to claim 1, characterized in that: The particle size of the planting soil is less than or equal to 3 cm.

6. A slope ecological restoration method according to claim 1, characterized in that: In parts by weight, the raw materials of the grouting mixture also include 6-8 parts of gamma-cyclodextrin.

7. A slope ecological restoration method according to claim 1, characterized in that: The length of the grass fiber is 3-5 cm.

8. A slope ecological restoration method according to claim 1, characterized in that: The raw materials of the grass seed mixture also include 3-6 parts of hydroxypropyl methylcellulose in parts by weight.

9. A slope ecological restoration method according to claim 1, characterized in that: The binder is silicate cement.

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