Ecological protection construction method for high-filling side slope

Abstract

The invention provides a high-filling slope ecological protection construction method, and relates to the technical field of slope protection engineering. The construction method comprises the following implementation steps: step 1, slope pretreatment; the method comprises the following steps: firstly, shaping and trimming a high-filled side slope, cleaning surface topsoil, gravels and weeds, and synchronously presetting a through-type drainage system at the top, the waist and the toe of the side slope; comprising the four steps of anchor rod laying, grouting and anchoring, lattice beam pouring and geogrid laying, specifically, drilling is conducted on the trimmed slope surface of the side slope, anchor rods are laid, lattice beams fixedly connected with the anchor rods are formed through pouring, then the geogrids are flatly laid in the coverage area of the lattice beams, and double fixing is completed. The anti-sliding stability of the slope body is enhanced, the geogrids can disperse the load of the slope body, the shear strength of the surface soil body of the slope is improved, the overall stability of the high-filled slope is remarkably improved, and geological disasters such as landslide and collapse of the slope are effectively prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of slope protection engineering, in particular to a high-fill slope ecological protection construction method. BACKGROUND

[0002] The high-fill slope refers to the slope with a fill height exceeding 10m, which has the characteristics of large thickness of fill, large dead load, poor stability, etc. Under the action of the natural environment, it is prone to geological disasters such as landslide, collapse, soil erosion, etc. Not only will it destroy the surrounding ecological environment, but also may cause serious consequences such as damage to infrastructure and casualties. At present, the high-fill slope protection methods are mainly divided into two categories: traditional rigid protection and ecological protection. The traditional rigid protection methods include mortar rubble retaining wall, sprayed anchor concrete, lattice beam support, etc. This kind of method has the advantages of high supporting strength and good stability, but has the problems of poor ecology, destruction of the surrounding natural landscape, and insufficient coordination with the environment. The ecological protection method has insufficient stability, and it is difficult to meet the anti-sliding requirements of high-fill slope by relying on vegetation roots alone, especially in areas with steep slope or poor geological conditions, which is prone to slope instability. In addition, the anti-erosion ability is weak, and the ecological substrate layer is prone to loss under the action of rainfall erosion, resulting in low vegetation survival rate.

[0003] Therefore, the present application provides a high-fill slope ecological protection construction method which has high stability, strong ecology, strong anti-erosion ability and convenient construction, thereby effectively solving the above problems and technical difficulties. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a high-fill slope ecological protection construction method, which aims to overcome the defects of poor stability, insufficient ecology, weak anti-erosion ability and low construction efficiency of the high-fill slope protection method in the prior art, and provides a high-fill slope ecological protection construction method. The method improves the slope stability by constructing a composite support system, optimizes the structure of the ecological substrate layer to enhance the water and fertilizer retention and anti-erosion ability, improves the vegetation survival rate by combining scientific vegetation planting and maintenance measures, and realizes the coordination and unity of the protection and reinforcement of the high-fill slope and ecological restoration.

[0005] To achieve the above purpose, the present application is realized by the following technical scheme: A high-fill slope ecological protection construction method, the implementation steps of the construction method are as follows: Step 1: slope pretreatment; first, the high-fill slope is shaped and trimmed, the surface soil, gravel and weeds are cleaned, and a through drainage system is simultaneously preset on the slope top, waist and foot; Step 2: composite support system construction; including four steps of anchor rod layout, grouting anchor rod, lattice beam pouring and geogrid laying, drilling anchor rod on the trimmed slope surface, pouring to form lattice beam fixedly connected with the anchor rod, then laying geogrid on the lattice beam covering area and completing double fixation; Step 3: laying of ecological substrate layer; the ecological substrate layer is sequentially improved substrate layer, water retaining layer and nutrient layer from bottom to top, each layer is tightly combined to form stable ecological growth environment; Step 4: vegetation planting; adopting the combination of spray seeding and seedling greening, spray seeding mixed grass seeds on the surface of the ecological substrate layer, and planting shrub seedlings at the lattice beam nodes and slope foot area; Step 5: later maintenance; implementing integrated maintenance measures of watering and moisture retention, staged fertilization, comprehensive pest control and replanting.

[0006] Further, in the process of step 1 slope pretreatment, according to the actual terrain, the slope surface gradient after slope shaping and trimming needs to be controlled between 1:1.5 and 1:2.5, when the slope height is greater than or equal to 15 m, a horse path with a width of 2-3 m is arranged along the vertical direction of the slope at intervals, the horizontal slope of the horse path is inclined inward by 2%-3%, the depth of topsoil cleaning needs to be greater than 10 cm, the slope surface is leveled by hand after cleaning and is treated by tamping to ensure that the slope surface is flat and solid, the compaction degree is greater than or equal to 90%, the pre-set through drainage system includes a slope top water intercepting ditch, a slope waist drainage ditch and a slope foot edge ditch, the ditches are connected in sequence to form a drainage network, the slope top water intercepting ditch is 2-3 m away from the slope top edge, the cross section of the ditch is isosceles trapezoidal, the width of the ditch is 60-80 cm, and the depth of the ditch is 50-70 cm, the slope waist drainage ditch is arranged along the inner side edge of the horse path, the cross section of the ditch is rectangular, the width of the ditch is 40-60 cm, and the depth of the ditch is 40-50 cm, the slope foot edge ditch is connected with the end of the slope waist drainage ditch, and the longitudinal slope gradient of the entire drainage system is not less than 0.5%.

[0007] Further, in the process of anchor rod layout of step 2 composite support system construction, the anchor rod is full-length bonded threaded steel anchor rod, the distance between the anchor rods is 1.5-2.5 m, and the anchor rods are uniformly arranged in the shape of a plum blossom, after drilling, the hole is cleaned to remove rock powder and sundries, then the anchor rod is inserted into the hole, the length of the exposed end of the anchor rod is controlled to be 10-15 cm, after the anchor rod is inserted, cement slurry is used for grouting and solidification, during the process of grouting and anchoring, the grouting pressure is controlled to be 0.5-1.0 MPa, the secondary grouting process is adopted during the grouting process to ensure that the grouting is full, and after the strength of the cement slurry reaches more than 70% of the design strength, subsequent construction is carried out.

[0008] Further, the step 2 composite support system is constructed after grouting and anchoring, and the lattice beam is formed by pouring reinforced concrete. The spacing of the lattice beam needs to correspond to the spacing of the anchor rod. During the construction of the lattice beam, longitudinal and transverse stress reinforcement is welded to the exposed end of the anchor rod to form a steel framework, and the thickness of the steel reinforcement protective layer is ≥30 mm. The formwork is assembled by steel formwork, and the verticality deviation of the formwork installation is ≤3 mm / m. The pouring is carried out by inserting the vibrating rod to densify the layers, and after pouring is completed, the geotextile is covered and watered for maintenance, and the maintenance time is not less than 14 days. After maintenance is completed, the geogrid is laid. The geogrid is a bidirectional tensile polypropylene geogrid, which is laid along the slope surface from top to bottom, with a lap width of 15-20 cm, and the lap is fixed by U-shaped nails with a spacing of 50-80 cm. At the same time, the edge of the geogrid is welded and fixed with the exposed end of the anchor rod.

[0009] Further, during the step 3 ecological substrate layer laying process, the improved substrate layer is mixed by plough soil, river sand, mature organic fertilizer, ordinary Portland cement and polyacrylamide water retaining agent in a weight ratio of 60:20:15:3:2. During the mixing process, an appropriate amount of water is added for adjustment. The water content is in the range of 20%-25%, the laying thickness is 8-12 cm, the water retaining layer is mixed by high molecular water absorbing resin and perlite in a weight ratio of 1:5, the laying thickness is 2-3 cm, the nutrient layer is mixed by humus, nitrogen, phosphorus and potassium compound fertilizer and microbial agent in a weight ratio of 90:8:2, and the laying thickness is 3-5 cm.

[0010] Further, during the step 4 vegetation planting process, the spray seeding mixed grass seed is composed of tall fescue, kikuyu grass, alfalfa and cornflower in a weight ratio of 4:3:2:1. Before spray seeding, 20 g / m² non-woven fabric is laid on the surface of the nutrient layer. During spray seeding, the mixed grass seed is mixed with water and plant adhesive in a weight ratio of 1:50:0.5 to form spray seeding slurry. After spray seeding is completed, a shading net with a shading rate of 70% is covered. The shrub seedlings are selected from robust seedlings of Amorpha fruticosa, Hippophae rhamnoides or Caragana. The plant spacing is 50-80 cm, the row spacing is 60-100 cm, the planting pit is artificially excavated, the pit depth is 30-50 cm, a 5-10 cm thick mat layer of mature organic fertilizer is laid on the pit bottom, and after planting, the improved substrate is backfilled and compacted in layers. Then, the root fixing water is poured, and 0.1% rooting agent is added to the root fixing water.

[0011] Further, during the step 5 later stage maintenance process, watering and moisture retention need to be carried out once a day, using a spraying method, maintaining the water content of the substrate layer at 60%-70%, and applying the first mature organic fertilizer 30 days after spray seeding, with an application amount of 50-80 g / m². The second mature organic fertilizer is applied 60 days later, with the same application amount as the first time. The nitrogen, phosphorus and potassium compound fertilizer is applied 90 days later, with an application amount of 30-50 g / m². After fertilization, water is poured in time to dissolve.

[0012] Furthermore, in the later maintenance process of step 5, the integrated pest management adopts a combination of biological and chemical control methods. The growth of vegetation on the slope is inspected regularly, and pests and diseases are dealt with in a timely manner to prevent their spread. The integrated maintenance measures of replanting and reseeding are carried out 60 days after spraying for areas with a survival rate of less than 80%. When replanting, the original spraying grass seed ratio and spraying amount are used. When replanting, seedlings of the same species as the original shrubs and with strong growth are selected for planting to ensure uniform vegetation coverage on the slope.

[0013] This invention provides a construction method for ecological protection of high-fill slopes. It has the following beneficial effects: 1. This invention provides a construction method for ecological protection of high fill slopes. The construction method consists of a composite support system composed of anchor rod grid beams and geogrids. The anchor rod grid beams can effectively transfer slope stress and enhance the slope's anti-sliding stability. The geogrids can disperse slope loads and improve the shear strength of the surface soil of the slope, significantly improving the overall stability of high fill slopes and effectively preventing geological disasters such as slope landslides and collapses.

[0014] 2. This invention provides a construction method for ecological protection of high-fill slopes. The high-fill slopes constructed using this method exhibit better ecological conditions and stronger erosion resistance. It employs a layered ecological substrate layer, combined with a vegetation establishment method that integrates hydroseeding and seedling planting, achieving a reasonable combination of herbaceous plants and shrubs to form a stable vegetation community. The improved substrate in the ecological substrate layer incorporates wood fiber, enhancing its cohesiveness. The water-retaining layer is composed of a mixture of superabsorbent polymer and perlite, possessing excellent water retention and air permeability. The nutrient layer is rich in nutrients, promoting rapid vegetation growth. The tightly bonded layers form an ecological protection layer with strong erosion resistance, effectively reducing soil erosion. Detailed Implementation

[0015] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1:

[0016] This invention provides a construction method for ecological protection of high-fill slopes. The implementation steps of the construction method are as follows: Step 1: slope pretreatment; first, the high fill slope is shaped and trimmed, the surface soil, gravel and weeds are cleaned, and a through-type drainage system is preset on the slope top, waist and foot. According to the actual terrain, the slope gradient after shaping and trimming needs to be controlled between 1:1.5~1:2.5. When the slope height is greater than or equal to 15m, a horse path with a width of 2~3m is set along the vertical direction of the slope at intervals. The horizontal slope of the horse path is inclined inward by 2%~3%. The depth of the surface soil cleaning needs to be greater than 10cm. After cleaning, the slope surface is leveled by hand and treated by tamping to ensure that the slope surface is flat and solid, and the compaction degree is greater than or equal to 90%. The preset through-type drainage system includes a slope top water intercepting ditch, a slope waist drainage ditch and a slope foot ditch. The ditches are connected in sequence to form a drainage network. The slope top water intercepting ditch is 2~3m away from the slope top edge, with an isosceles trapezoidal cross section, a ditch width of 60~80cm and a ditch depth of 50~70cm. The slope waist drainage ditch is arranged along the inner side edge of the horse path, with a rectangular cross section, a ditch width of 40~60cm and a ditch depth of 40~50cm. The slope foot ditch is connected with the end of the slope waist drainage ditch. The longitudinal slope gradient of the entire drainage system is not less than 0.5%; Step 2: construction of composite support system; including anchor rod arrangement, grouting anchoring, lattice beam pouring and geogrid laying, four steps. Anchor rods are drilled and arranged on the shaped and trimmed slope surface. Lattice beams are poured to form fixed connection with the anchor rods. Then geogrids are laid on the lattice beam covering area and double fixation is completed. The anchor rod is a full-length bonded threaded steel anchor rod. The anchor rod spacing is 1.5~2.5m, and is uniformly arranged in a plum blossom shape. After drilling, the hole is cleaned of rock powder and debris. Then the anchor rod is inserted into the hole. The length of the exposed end of the anchor rod is controlled to be 10~15cm. After the anchor rod is inserted, cement slurry is used for grouting and solidification. During the grouting and anchoring process, the grouting pressure is controlled to be 0.5~1.0MPa. The two-stage grouting process is used to ensure full grouting. After the strength of the cement slurry reaches more than 70% of the design strength, subsequent construction is carried out. After grouting and anchoring, the lattice beam is poured and formed by reinforced concrete during the lattice beam pouring process. The spacing of the lattice needs to correspond to the spacing of the anchor rods. During the construction of the lattice beam, longitudinal and transverse stress reinforcing steel bars are welded on the exposed end of the anchor rod to form a steel reinforcement cage. The thickness of the steel reinforcement protective layer is greater than or equal to 30mm. The formwork is assembled by steel formwork. The verticality deviation of the formwork installation is less than or equal to 3mm / m. The pouring is carried out by inserting a layered vibrating rod for dense vibration. After pouring, the geotextile is covered and watered for maintenance. The maintenance time is not less than 14 days. After maintenance, the geogrid is laid. The geogrid is a bidirectional tensile polypropylene geogrid. The geogrid is laid along the slope surface from top to bottom. The overlap width is 15~20cm. The overlap is fixed by U-shaped nails with a spacing of 50~80cm. At the same time, the edge of the geogrid is welded and fixed with the exposed end of the anchor rod. Step 3: ecological substrate layer laying; the ecological substrate layer is sequentially improved substrate layer, water retaining layer and nutrient layer from bottom to top, each layer is tightly combined to form a stable ecological growth environment, the improved substrate layer is mixed by cultivated soil, river sand, mature organic fertilizer, ordinary Portland cement and polyacrylamide water retaining agent according to a weight ratio of 60:20:15:3:2, a proper amount of water is added for adjustment during the mixing process, the water content is in a range of 20% to 25%, the laying thickness is 8 to 12 cm, the water retaining layer is mixed by high molecular water absorbing resin and perlite according to a weight ratio of 1:5, the laying thickness is 2 to 3 cm, the nutrient layer is mixed by humus, nitrogen, phosphorus and potassium compound fertilizer and microbial agent according to a weight ratio of 90:8:2, the laying thickness is 3 to 5 cm; Step 4: vegetation planting; a combination of spray seeding and seedling greening is adopted, mixed grass seeds are sprayed on the surface of the ecological substrate layer, shrub seedlings are planted at the nodes of the lattice beam and the slope foot, the mixed grass seeds are composed of tall fescue, Bermuda grass, alfalfa and cornflower according to a weight ratio of 4:3:2:1, 20 g / m2 non-woven fabric is laid on the surface of the nutrient layer before the mixed grass seeds are sprayed, the mixed grass seeds, water and plant adhesive are mixed according to a weight ratio of 1:50:0.5 to prepare spray seeding slurry, the spray seeding is completed, and a shading net with a shading rate of 70% is covered, the shrub seedlings are selected from robust seedlings of Amorpha fruticosa, Hippophae rhamnoides or Caragana, the plant spacing is 50 to 80 cm, the row spacing is 60 to 100 cm, the planting pits are manually excavated, the pit depth is 30 to 50 cm, a 5 to 10 cm thick mat layer of mature organic fertilizer is laid on the pit bottom, the improved substrate is backfilled after the planting, and is layered and compacted, and then the root fixing water is poured, the root fixing water is added with 0.1% rooting agent; Step 5: later maintenance; integrated maintenance measures of watering and moisture keeping, staged fertilization, disease and pest comprehensive prevention and control and supplemental planting and seeding are implemented, watering and moisture keeping needs to be implemented once a day, a spraying mode is adopted, the substrate layer water content is kept at 60% to 70%, the first mature organic fertilizer is applied 30 days after the spray seeding, the application amount is 50 to 80 g / m2, the second mature organic fertilizer is applied 60 days after the spray seeding, the application amount is the same as the first time, the nitrogen, phosphorus and potassium compound fertilizer is applied 90 days after the spray seeding, the application amount is 30 to 50 g / m2, water is poured in time after the fertilization to dissolve, the disease and pest comprehensive prevention and control adopts a combination of biological prevention and chemical prevention, the slope vegetation growth condition is regularly checked, the disease and pest are treated in time to avoid the disease and pest spreading, the integrated maintenance measures of supplemental planting and seeding are implemented 60 days after the spray seeding on the areas with a survival rate of less than 80%, the original spray seeding grass seed ratio and spray seeding amount are adopted for spray seeding when the supplemental seeding is implemented, the same shrub species as the original planting shrub species and robust seedlings are selected for planting when the supplemental planting is implemented, and the slope vegetation coverage is ensured to be uniform.

[0017] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since various modifications can be made by those skilled in the art, without departing from the spirit and scope of the application, which are defined by the appended claims and their equivalents. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present application, without creative work, are within the scope of the present application.

Claims

1. A construction method for ecological protection of high-fill slopes, characterized in that: The implementation steps of the construction method are as follows: Step 1: Slope pretreatment; First, the high fill slope is shaped and repaired, and the surface loose soil, gravel and weeds are cleared. At the same time, a through-type drainage system is pre-installed at the top, middle and bottom of the slope. Step 2: Construction of composite support system; including four steps: anchor bolt installation, grouting and anchoring, grid beam pouring and geogrid laying. Anchor bolts are drilled and installed on the trimmed slope surface, and grid beams are poured to form fixed connections with the anchor bolts. Then, geogrids are laid flat in the area covered by the grid beams and double-fixed. Step 3: Laying the ecological substrate layer; The ecological substrate layer consists of an improved substrate layer, a water-retaining layer, and a nutrient layer from bottom to top. Each layer is tightly bonded to form a stable ecological growth environment. Step 4: Vegetation establishment; A combination of hydroseeding and seedling planting is adopted. Mixed grass seeds are hydroseeded on the surface of the ecological substrate layer, and shrub seedlings are planted at the nodes of the grid beams and the foot of the slope. Step 5: Post-maintenance; Implement integrated maintenance measures including watering and moisturizing, phased fertilization, integrated pest and disease control, and replanting / sowing.

2. The construction method for ecological protection of high-fill slopes according to claim 1, characterized in that: In step 1 of the slope pretreatment process, the slope gradient after shaping and trimming needs to be controlled between 1:1.5 and 1:2.5, depending on the actual terrain. When the slope height is ≥15m, a 2-3m wide walkway is set vertically along the slope, with a transverse slope of 2%-3% inward. The topsoil clearing depth needs to be greater than 10cm. After clearing, the slope surface is manually leveled and compacted to ensure a flat and firm surface with a compaction degree ≥90%. The pre-designed continuous slope... The drainage system includes a top intercepting ditch, a waist drainage ditch, and a foot ditch. These ditches are connected in sequence to form a drainage network. The top intercepting ditch is 2-3m from the edge of the top of the slope, with an isosceles trapezoidal cross-section, a width of 60-80cm, and a depth of 50-70cm. The waist drainage ditch is laid along the inner edge of the walkway, with a rectangular cross-section, a width of 40-60cm, and a depth of 40-50cm. The foot ditch is connected to the end of the waist drainage ditch. The longitudinal slope of the entire drainage system is not less than 0.5%.

3. The construction method for ecological protection of high-fill slopes according to claim 1, characterized in that: In the anchor installation process of the composite support system in step 2, full-length bonded threaded steel anchors are used. The anchor spacing is 1.5-2.5m, and they are evenly arranged in a quincunx pattern. After drilling, the rock powder and debris in the hole are cleaned, and then the anchor is inserted into the hole. The exposed length of the anchor is controlled to be 10-15cm. After the anchor is inserted, cement grout is injected for curing. During the grouting and anchoring process, the grouting pressure is controlled to be 0.5-1.0MPa. A secondary grouting process is used during the grouting process to ensure full grouting. Subsequent construction is carried out after the cement grout strength reaches more than 70% of the design strength.

4. The construction method for ecological protection of high-fill slopes according to claim 1, characterized in that: The composite support system in step 2 is constructed after grouting and anchoring. During the casting of the grid beam, the grid beam is cast with reinforced concrete. The spacing of the grid needs to correspond one-to-one with the spacing of the anchor rods. During the construction of the grid beam, longitudinal and transverse reinforcing bars are welded to the exposed ends of the anchor rods to form a reinforcing steel skeleton. The thickness of the reinforcing steel protective layer is ≥30mm. The formwork is assembled with steel formwork. The verticality deviation of the formwork installation is ≤3mm / m. The pouring is carried out by layering and compacting with an immersion vibrator. After the pouring is completed, the geotextile is covered and water is sprinkled for curing. The curing time is not less than 14 days. After the curing is completed, the geogrid is laid. The geogrid is made of biaxially stretched polypropylene geogrid. When laying the geogrid, it is laid flat from top to bottom along the slope. The overlap width is 15-20cm. The overlap is fixed with U-shaped nails with a spacing of 50-80cm. At the same time, the edge of the geogrid is welded and fixed to the exposed ends of the anchor rods.

5. The construction method for ecological protection of high-fill slopes according to claim 1, characterized in that: In step 3, during the laying of the ecological substrate layer, the improved substrate layer is composed of topsoil, river sand, decomposed organic fertilizer, ordinary silicate cement, and polyacrylamide water-retaining agent mixed in a weight ratio of 60:20:15:3:

2. During the mixing process, an appropriate amount of water is added to adjust the moisture content, which ranges from 20% to 25%. The thickness of the layer is 8 to 12 cm. The water-retaining layer is composed of superabsorbent polymer resin and perlite mixed in a weight ratio of 1:

5. The thickness of the layer is 2 to 3 cm. The nutrient layer is composed of humus, nitrogen, phosphorus, and potassium compound fertilizer, and microbial agents mixed in a weight ratio of 90:8:

2. The thickness of the layer is 3 to 5 cm.

6. The construction method for ecological protection of high-fill slopes according to claim 1, characterized in that: In step 4, during vegetation establishment, the mixed grass seed is composed of tall fescue, bermudagrass, alfalfa, and cosmos in a weight ratio of 4:3:2:

1. Before spraying, a 20g / m² non-woven fabric is laid on the surface of the nutrient layer. During spraying, the mixed grass seed is mixed with water and plant binder in a weight ratio of 1:50:0.5 to make a spraying slurry. After spraying, a shade net with a 70% shading rate is used to cover the seed. Healthy seedlings of Amorpha fruticosa, Hippophae rhamnoides, or Caragana korshinskii are selected for shrub seedlings. The plant spacing is 50-80cm and the row spacing is 60-100cm. The planting pits are dug manually, with a depth of 30-50cm. A 5-10cm thick layer of decomposed organic fertilizer is laid at the bottom of the pit. After planting, the improved substrate is backfilled and compacted in layers. The seedlings are then thoroughly watered, and 0.1% rooting agent is added to the water.

7. The construction method for ecological protection of high-fill slopes according to claim 1, characterized in that: During the later maintenance process in step 5, watering and moisturizing should be carried out once a day by spraying to maintain the moisture content of the substrate layer at 60% to 70%. For staged fertilization, the first application of well-rotted organic fertilizer should be applied 30 days after spraying, at a rate of 50 to 80 g / m²; the second application of well-rotted organic fertilizer should be applied 60 days after spraying, at the same rate as the first application; and the application of nitrogen, phosphorus, and potassium compound fertilizer should be applied 90 days after spraying, at a rate of 30 to 50 g / m². Water should be applied promptly after fertilization to dissolve the fertilizer.

8. The construction method for ecological protection of high-fill slopes according to claim 1, characterized in that: In the later maintenance process of step 5, the integrated pest management adopts a combination of biological and chemical control. Regularly inspect the vegetation growth on the slope, and deal with pests and diseases in a timely manner to prevent their spread. The integrated maintenance measures of replanting and reseeding are carried out 60 days after spraying for areas with a survival rate of less than 80%. When reseeding, spraying is carried out according to the original spraying grass seed ratio and spraying amount. When replanting, select healthy seedlings of the same species as the original shrubs to ensure uniform vegetation coverage on the slope.