Construction method for combined protection of three-dimensional soil fixation net pad and coconut shred blanket on inner slope of embankment

Abstract

The invention relates to the technical field of slope treatment, and provides a dike inner slope soil fixation net pad and coconut shred blanket combined protection construction method. According to the construction method, surface soil is laid on a leveled slope surface and compacted, and anchoring grooves are excavated in the slope top and the slope bottom; grass seeds are uniformly mixed and sown on the surface soil, and after the coconut shred blanket is uniformly laid and covers the prepared slope surface without wrinkles, the three-dimensional soil fixing mesh pad is unfolded and laid on the fixed coconut shred blanket; and finally, after the three-dimensional soil fixation net pad is laid, water spraying maintenance is carried out. Therefore, the three-dimensional soil fixation net points are used for providing an excellent soil fixation effect, the coconut shred blankets are used for promoting vegetation growth and ecological restoration, through the combined effect of the three-dimensional soil fixation net pads and the coconut shred blankets, protection of the side slope is achieved, meanwhile, harmonious symbiosis with the natural environment can be better achieved, and protection of the side slope in the embankment can be conducted more environmentally, economically and conveniently. And meanwhile, the method has the characteristics of simplicity and convenience in construction, low cost, environment friendliness and the like.

Description

Technical Field

[0001] The present application relates to the technical field of slope management, and in particular to a construction method for combined protection of an inner slope of a levee with a soil-fixing mesh mat and a coconut fiber blanket. Background Art

[0002] In the construction of embankment projects, ensuring the stability of the slope is the primary task, and the stability and ecological protection of the slope inside the embankment are key issues. Although traditional protective measures, such as gabion mesh slopes and concrete slopes, can provide a certain degree of stability in the short term, these methods have the disadvantages of complex construction, high cost, and a greater impact on the spontaneous combustion environment.

[0003] In addition, although gabion cages have good water permeability and durability, their material cost is high and installation is cumbersome; although concrete slope protection has high strength and strong anti-scouring ability, it causes great damage to the original landform during construction, and ecological restoration is difficult. These problems not only limit the sustainable development of the project, but also run counter to the current goal of pursuing ecological civilization. Summary of the invention

[0004] The purpose of the present application is to provide a combined protection construction method of a soil-fixing mesh mat and a coconut fiber blanket on the inner slope of a levee, so as to solve or alleviate the problems existing in the above-mentioned prior art.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] The present application provides a combined protection construction method of a soil-fixing mesh mat and a coconut fiber blanket on the inner slope of a levee, comprising: step S101, laying 20mm-30mm thick topsoil on a leveled slope surface and compacting it, and at the same time, excavating anchor trenches at the top and bottom of the slope along the water flow direction according to preset dimensions; step S102, evenly mixing and sowing different kinds of grass seeds on the topsoil, and covering a 5mm-10mm thick soil layer and compacting it; step S103, after the coconut fiber blanket is evenly and wrinkle-freely laid on the trimmed slope surface, the three-dimensional soil-fixing mesh mat is unfolded and laid on the fixed coconut fiber blanket; step S104, after the three-dimensional soil-fixing mesh mat is laid, watering and curing are carried out, and the soil moisture content is kept at 40%-50%.

[0007] Preferably, step S101 includes: after trimming the side slope of the embankment according to a preset slope, grading and leveling the slope surface; after fertilizing the leveled slope surface, laying 20mm to 30mm thick topsoil with a water retaining agent added and compacting it; and excavating anchor trenches at the top and bottom of the slope along the water flow direction with a depth of 30cm and a width of 15cm.

[0008] Preferably, in step S102: tall fescue seeds and ryegrass seeds are uniformly mixed and sown on the topsoil in a ratio of 1:2, compacted after covering with a soil layer of 5 mm to 10 mm thickness, and watered for maintenance.

[0009] Preferably, in step S103, the coconut fiber carpet is laid downward from the top of the slope by overlapping, and the coconut fiber carpet is fixed on the slope surface by U-shaped nails.

[0010] Preferably, the coconut fiber carpet is laid longitudinally on the slope surface, and the top is buried in the anchoring groove; the overlap method is used to process the joints of the coconut fiber carpet, and the middle joints and seams of the coconut fiber carpet are reinforced with U-shaped nails; wherein the overlap width of the coconut fiber carpet during the overlap treatment is not less than 15 cm.

[0011] Preferably, the three-dimensional soil-fixing mesh mat is unfolded and laid on the fixed coconut fiber carpet in accordance with the slope direction of the slope surface, and the upper and lower ends of the three-dimensional soil-fixing mesh mat are respectively buried in the anchoring grooves at the top and bottom of the slope, and the three-dimensional soil-fixing mesh mat is fixed to the coconut fiber carpet with U-shaped nails; wherein the overlap width of adjacent three-dimensional soil-fixing mesh mats is 10 cm.

[0012] Preferably, in step S104, a sprinkler belt is laid on the slope surface for uniform watering and maintenance, and the watering and maintenance cycle is 3 to 4 weeks.

[0013] Beneficial effects:

[0014] In the combined protection construction method of the soil-fixing mesh mat and coconut fiber blanket for the inner slope of the embankment provided in the embodiment of the present application, first, a 20mm to 30mm thick topsoil is laid on the leveled slope surface and compacted, and at the same time, anchor trenches of preset sizes are excavated at the top and bottom of the slope along the direction of water flow; then, different kinds of grass seeds are evenly mixed and sown on the topsoil, and covered with 5mm to 10mm thick fine soil and compacted; then, after the coconut fiber blanket is evenly and wrinkle-freely laid on the finished slope surface, the three-dimensional soil-fixing mesh mat is unfolded and laid on the fixed coconut fiber blanket; finally, after the three-dimensional soil-fixing mesh mat is laid, watering and maintenance are carried out, and the soil moisture content is maintained at 40% to 50%.

[0015] Therefore, the three-dimensional soil-fixing mesh mat provides strong structural support, forms a stable network structure on the slope surface, effectively disperses and absorbs external forces, increases the shear strength of the soil, and prevents soil and water loss; the coconut fiber blanket provides good water retention and air permeability, provides necessary environmental support for soil and vegetation, maintains soil moisture content, and promotes plant growth. This combined process makes full use of the mechanical protection of the three-dimensional soil-fixing mesh mat and the ecological improvement function of the coconut fiber blanket. The three-dimensional soil-fixing mesh mat and the coconut fiber blanket work together to build a slope protection system that is both stable and has ecological functions. It not only effectively prevents soil and water loss, but also accelerates vegetation recovery, achieving the dual effects of soil and water conservation and ecological restoration, and ensuring the long-term stability and ecological sustainability of the slope. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0017] in:

[0018] Figure 1 A schematic diagram of a process of a combined protection construction method of a soil-fixing mesh mat and a coconut fiber blanket for an inner slope of a levee provided according to some embodiments of the present application;

[0019] Figure 2 A schematic diagram of the structure of a coconut silk blanket provided according to some embodiments of the present application;

[0020] Figure 3 A schematic diagram of the structure of a three-dimensional soil-fixing mesh mat provided according to some embodiments of the present application;

[0021] Figure 4 A schematic diagram of the structure of a U-shaped nail provided according to some embodiments of the present application;

[0022] Figure 5 A schematic diagram of the protection design of the inner slope of the embankment provided according to some embodiments of the present application. DETAILED DESCRIPTION

[0023] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present application and does not limit the present application. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present application without departing from the scope or spirit of the present application. For example, a feature shown or described as a part of an embodiment may be used in another embodiment to produce yet another embodiment. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the embodiments of the present invention should belong to the scope of protection of the embodiments of the present invention.

[0024] At present, in the construction of inner slopes of embankments, traditional protective measures such as gabion mesh slopes and concrete slopes are generally used. Although these traditional measures can provide a certain degree of stability in the short term, the construction is complex, the cost is high, and the impact on the spontaneous combustion environment is large; moreover, although gabion mesh has good permeability and durability, its material cost is high and the installation is cumbersome; and although concrete slope protection has high strength and strong anti-scouring ability, it causes great damage to the original landform during construction, and ecological restoration is difficult.

[0025] Based on this, the embodiment of the present application provides a method for the combined protection construction of a soil-fixing mesh mat and a coconut fiber blanket on the inner slope of a levee. The method uses three-dimensional soil-fixing mesh points to provide an excellent soil fixation effect, and uses coconut fiber blankets to promote vegetation growth and ecological restoration. Through the combined action of the three-dimensional soil-fixing mesh mat and the coconut fiber blanket, the slope can be better protected while coexisting harmoniously with the natural environment. It is more environmentally friendly, economical and convenient to protect the inner slope of the levee. Compared with traditional methods, it not only significantly improves the stability of the slope, but also has the characteristics of simple construction, low cost and environmental friendliness.

[0026] like Figures 1 to 5 As shown, the combined protection construction method of the soil-fixing mesh mat and coconut fiber blanket on the inner slope of the embankment includes:

[0027] Step S101: laying topsoil with a thickness of 20 mm to 30 mm on the leveled slope and compacting it. At the same time, excavating anchor trenches with preset dimensions along the water flow direction at the top and bottom of the slope.

[0028] In this application, before laying the three-dimensional soil-fixing mesh mat and coconut fiber carpet, first remove the debris on the slope and level the slope. Specifically, remove the debris and loose soil on the embankment, especially the obstacles that affect the stability of the slope (such as large rocks, tree roots, etc.), ensure that the slope is clean and tidy, and provide good basic conditions for subsequent construction. Then, the embankment is sloped according to the preset slope. During the slope trimming process, special equipment, such as excavators or bulldozers, are used to ensure that the slope is uniform and smooth, and the slope is monitored at all times, and finally it reaches the predetermined slope standard of 1:3.

[0029] After the slope is corrected, the slope surface is graded and leveled to ensure the flatness and stability of the slope, especially at the junction of different geological layers, reinforcement treatment is carried out to prevent landslides or soil loss. During the slope finishing process, appropriate drainage design and treatment are carried out to ensure that the slope has good drainage performance. If necessary, drainage ditches, drainage holes or other drainage facilities can be set up to prevent rainwater or groundwater from scouring the slope surface and affecting the stability of the slope.

[0030] Among them, geological survey, meteorological condition assessment and hydrological survey are required before repair. Through geological survey, the geological conditions of the slope are determined, including soil type, slope, stability, etc., to ensure the scientificity and feasibility of the construction; through meteorological condition assessment, the climate and weather conditions of the construction area, especially the rainfall and rainfall intensity, are determined, and the impact of meteorology on construction is assessed to formulate corresponding preventive measures; through hydrological survey, the hydrological conditions around the slope, such as the flow direction and flow of surface water and groundwater, are determined to ensure the rationality of the drainage design.

[0031] After the slope is leveled, fertilization is carried out, and appropriate amounts of organic fertilizer and compound fertilizer are applied to improve soil toughness and promote the growth of vegetation roots; after fertilization, 20mm to 30mm thick topsoil is laid to improve soil density and slope stability. Among them, water-retaining agents are added to the topsoil to enhance the soil's water retention capacity and effectively reduce vegetation damage caused by drought. The selection of topsoil is based on actual geological conditions. Soil rich in organic matter and good air permeability is selected to facilitate subsequent grass seed sowing and vegetation growth.

[0032] While the slope is being constructed, anchor trenches are excavated along the water flow direction at the top and bottom of the slope. The trench depth is 30 cm and the width is 15 cm. This is used to fix the three-dimensional soil-fixing mesh mat and coconut fiber blanket. It should be noted that the precise excavation of the anchor trench is conducive to ensuring the firmness and stability of the subsequent laying materials.

[0033] Step S102: Different kinds of grass seeds are evenly mixed and sown on the surface soil, and covered with 5 mm to 10 mm thick fine soil and compacted.

[0034] In the embodiment of the present application, tall fescue seeds and ryegrass seeds are uniformly mixed in a ratio of 1:2 and then uniformly and mixedly sown on the topsoil. Among them, tall fescue has deep roots and drought tolerance; while ryegrass has the characteristics of rapid germination and strong early covering ability. By mixing tall fescue and ryegrass, both the stability of the slope and the early greening effect can be taken into account.

[0035] Sow the mixed grass seeds evenly on the entire slope surface as required to avoid the problem of grass seed accumulation or uneven distribution. By evenly mixing and sowing the mixed grass seeds in the topsoil with a thickness of 20mm to 30mm, the seeds can be effectively protected from the influence of the external environment and the germination rate of the seeds can be increased. During the sowing process, adjust the sowing depth according to the specific conditions of the soil so that the grass seeds are in close contact with the topsoil to facilitate the development and growth of the root system.

[0036] After sowing the grass seeds, cover them with a layer of fine soil of 5mm to 10mm and gently compact the topsoil to ensure good contact between the seeds and the soil. The covering of the fine soil layer helps protect the grass seeds from wind erosion and bird pecking, and is also conducive to maintaining soil moisture. After covering, use a compaction tool to gently compact the topsoil to improve the contact between the grass seeds and the soil, thereby effectively promoting uniform germination.

[0037] After the grass seeds are taken care of, the soil moisture content is maintained at 40% to 50%. Appropriate soil moisture is crucial for the germination and growth of grass seeds. Especially in the early stage of sowing, watering maintenance should be strengthened to ensure that the soil is continuously moist. Here, the frequency of watering should be appropriately adjusted according to climatic conditions, such as high temperature and dry weather, to ensure that the grass seeds can germinate smoothly and quickly cover the slope surface.

[0038] Step S103: After the coconut fiber carpet is evenly and wrinkle-freely laid on the trimmed slope surface, the three-dimensional soil-fixing mesh mat is unfolded and laid on the fixed coconut fiber carpet.

[0039] In the embodiment of the present application, the coconut silk carpet is laid flat on the arranged slope surface to ensure uniform coverage and no wrinkles. And during the laying process, it is laid from the top of the slope downwards in sequence to ensure that the coconut silk carpet is closely fitted to the slope surface and reduce the wrinkles generated during the laying process. Among them, when the coconut silk carpet is laid, according to the force of the slope, the coconut silk carpet is laid longitudinally to enhance the stability of the coconut silk carpet; and the top plate of the coconut silk carpet is buried in the anchoring ditch, and U-shaped nails are used for reinforcement at the middle joints and seams. The overlap method is used at the joints of the coconut silk carpet, and the overlap width is not less than 15cm to ensure that the coconut silk carpet is evenly covered on the slope surface, effectively preventing soil erosion and displacement of the coconut silk carpet.

[0040] After the coconut fiber carpet is laid on the slope, it is fixed on the slope with U-shaped nails. Here, the fixing points of the coconut fiber carpet should be evenly distributed, especially at the edges and joints, to increase the density of the fixing points to ensure that the coconut fiber carpet fits the slope tightly and effectively prevents the coconut fiber carpet from loosening or shifting.

[0041] In the embodiment of the present application, the coconut silk carpet is made of natural coconut fiber, has excellent environmental protection characteristics and biodegradability, and has a structure including a multi-layer net and a fiber layer. The mesh of the coconut silk carpet is dense and of reasonable size, so all kinds of grass seeds can grow smoothly, providing moisture retention, wind protection and heat preservation for the early, middle and late stages of plant growth. In addition, the coconut silk carpet also has good water retention and air permeability, can keep the soil moist, and provide ideal conditions for plant seed germination and growth. As the coconut silk carpet degrades, its organic components can also provide nutrients for vegetation, promote rapid coverage of vegetation and root development, thereby enhancing the anti-erosion ability of the slope. Here, the performance indicators of the coconut silk carpet are shown in Table 1:

[0042] Table 1 Coconut silk carpet performance index table

[0043]

[0044] After the coconut fiber mat is laid and fixed, the three-dimensional soil-fixing mesh mat is unfolded and laid on the fixed coconut fiber mat according to the design requirements. When laying, the three-dimensional soil-fixing mesh mat should be consistent with the slope direction to ensure that the three-dimensional soil-fixing mesh mat is in close contact with the coconut fiber mat and the soil surface. In this process, the three-dimensional soil-fixing mesh mat should not be tightened.

[0045] During the laying process of the three-dimensional soil-fixing mesh mat, the upper and lower ends of the three-dimensional soil-fixing mesh mat are buried in the anchoring trenches at the top and bottom of the slope respectively, and the side ends are buried in the corresponding drainage trenches, and are reinforced with U-shaped nails or other devices to ensure the close combination of the three-dimensional soil-fixing mesh mat and the coconut fiber carpet to avoid loosening; the overlap width of the connected three-dimensional soil-fixing mesh mats is 10cm to effectively ensure the continuity of the overall coverage of the three-dimensional soil-fixing mesh mat.

[0046] When laying the three-dimensional soil-fixing mesh mat, use U-shaped nails to fix the three-dimensional soil-fixing mesh mat on the coconut fiber carpet. Specifically, use U-shaped nails with a diameter of 6mm and a length of 20cm to 40cm, and use washers to fix the three-dimensional soil-fixing mesh mat. The spacing between the U-shaped nails is 100cm to 15cm (including the overlap). Among them, U-shaped nails are arranged in the trench at a spacing of about 1m, and then the soil is filled and compacted. It should be noted that the fixing points of the U-shaped nails should be evenly distributed, especially at the edges and joints. The density of the fixing points should be appropriately increased to ensure that the three-dimensional soil-fixing mesh mat fits tightly with the coconut fiber carpet and the slope.

[0047] In areas with sudden changes in terrain or complex terrain, the density of U-shaped nails is effectively increased to ensure the overall flatness and stability of the three-dimensional soil-fixing mesh. At the junction of the three-dimensional soil-fixing mesh and the concrete paving stone, protective measures need to be taken because there are steel wires on the three-dimensional soil-fixing mesh. Soft materials are used to cover the surface of the mesh and U-shaped nails are used to fix it to ensure safety.

[0048] In the embodiment of the present application, the three-dimensional solid mesh pad is a multi-layer plastic structure made of thermoplastic resin, has a three-dimensional structure similar to the loofah network, has a flexible texture, can provide 90% space for soil, gravel and fine stones, promotes the in-depth development of plant roots, and forms a green protective layer. The specific structural performance indicators are shown in Table 2 below:

[0049] Table 2 Performance index table of three-dimensional soil-fixing mesh pad

[0050]

[0051]

[0052] The three-dimensional soil-fixing mesh slope protection can effectively improve the slope's anti-scouring ability through vegetation coverage; when the vegetation coverage rate reaches 30%, the slope can resist the erosion of light rain; when the vegetation coverage rate reaches 80%, the slope can also remain stable during heavy rain. In addition, when the plants grow lushly, the slope can withstand a runoff velocity of up to 6m / s, which is far beyond the anti-scouring ability of ordinary turf. The three-dimensional soil-fixing mesh slope protection can also effectively reduce water evaporation and increase soil infiltration. The use of black polyethylene material is also conducive to heat absorption and insulation, promoting seed germination and plant growth. It combines the physical stability of the geonet and the ecological benefits of the plants to provide lasting protection for the slope.

[0053] Step S104: After the three-dimensional soil-fixing mesh mat is laid, water is sprinkled for oxidation, and the soil moisture content is maintained at 40% to 50%.

[0054] After the coconut fiber carpet and three-dimensional soil-fixing net mat are laid, watering maintenance should be started immediately. In hot weather, watering should be carried out multiple times according to soil moisture and evaporation rate to keep the soil moist, especially in the early stage of grass seed germination, the soil moisture content should be kept at 40% to 50%. In cold weather, soil moisture evaporates slowly, and the number of sprinkler irrigation can be reduced accordingly to maintain appropriate soil moisture and ensure normal plant growth.

[0055] When watering and maintaining, sprinkler belts laid on the slope can be used for even watering. The amount of water can be better controlled through the sprinkler belts to avoid soil erosion or seed loss caused by excessive water flow, which can effectively reduce resource waste and improve water resource utilization efficiency. At the same time, it helps to keep the soil evenly moist, thereby increasing the germination rate of seeds.

[0056] During watering maintenance, it is necessary to regularly check soil moisture and plant survival rate. When the vegetation begins to grow steadily and the survival rate reaches more than 80%, the frequency of sprinkler irrigation can be gradually reduced while keeping the soil basically moist.

[0057] In the embodiment of the present application, the watering maintenance cycle is 3 to 4 weeks, but the maintenance period can be appropriately extended or shortened according to the vegetation growth and climatic conditions. In the early stage of vegetation growth, especially before the lawn reaches more than 5 cm, maintain a high frequency of sprinkler irrigation; as the vegetation grows, gradually reduce the number of sprinkler irrigation until the vegetation can spontaneously maintain moisture.

[0058] It should be noted that during the entire maintenance process, environmental factors such as rainfall, wind speed, sunshine time, etc. should be comprehensively considered, and the sprinkler irrigation plan should be flexibly adjusted according to the actual situation. For example, in continuous rainfall weather, sprinkler irrigation operations can be reduced or suspended to avoid overwatering. At the same time, a sprinkler maintenance monitoring mechanism should be established to record sprinkler irrigation time, sprinkler irrigation volume, and soil and vegetation reactions, so as to ensure that sprinkler irrigation maintenance work is scientific and reasonable through continuous monitoring, so as to meet the needs of vegetation growth and effectively save water resources.

[0059] In the method of the present application, the three-dimensional soil-fixing mesh mat is closely combined with the soil to form a solid protective layer to prevent slope sliding and collapse, and the coconut fiber blanket provides additional protection for the surface layer to reduce the erosion of the surface soil by water flow. At the same time, the coconut fiber blanket is made of natural coconut fiber, which has good degradability and environmental protection. It not only does not pollute the environment, but also can be naturally degraded into organic fertilizer, providing additional nutritional support for the growth of vegetation.

[0060] The construction method of the present application, on the one hand, is extremely simple in construction process, easy to operate, does not require professional equipment, and is easy to master in laying and fixing materials. It is suitable for slope protection projects in various complex terrains, which can significantly shorten the construction period and reduce manpower and equipment costs. Compared with traditional protection methods, the material cost of three-dimensional soil-fixing mesh mats and coconut fiber carpets is relatively low, and they are particularly suitable for large-scale promotion and use. In addition, the degradable nature of coconut fiber carpets reduces the need for later maintenance, thereby further reducing the total cost of the project.

[0061] On the other hand, this construction method can not only effectively prevent soil erosion, but also allow for rapid vegetation cover to form a self-igniting green landscape. While achieving the engineering protection goals, it also improves the ecological environment and aesthetic effects of the embankment, and is more in line with modern green engineering standards.

[0062] By applying this construction method to the internal slope protection of various embankment projects, especially earth slopes and engineering projects with ecological restoration requirements, such as river management, reservoir dams, channel slopes, etc., the combination of three-dimensional soil-fixing mesh mats and coconut fiber blankets can significantly improve the stability of the slopes, prevent soil erosion, promote vegetation recovery, and improve the quality of the ecological environment; it provides an efficient, environmentally friendly and economical solution for slope protection projects that require rapid construction, reduced costs and reduced environmental impact.

[0063] In the description of the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0064] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A construction method for combined protection of inner slope soil consolidation mesh mat and coconut fiber blanket in embankment, characterized in that: include: Step S101: laying topsoil with a thickness of 20 mm to 30 mm on the leveled slope and compacting it, and at the same time, excavating anchor trenches at the top and bottom of the slope along the direction of water flow according to preset dimensions; Step S102, sowing different kinds of grass seeds evenly mixed on the topsoil, and covering with a soil layer of 5 mm to 10 mm thickness and compacting; Step S103: After the coconut fiber carpet is evenly and wrinkle-freely laid on the trimmed slope surface, the three-dimensional soil-fixing mesh mat is unfolded and laid on the fixed coconut fiber carpet; Step S104: After the three-dimensional soil-fixing mesh mat is laid, watering and curing are performed to maintain the soil moisture content at 40% to 50%.

2. The combined protection construction method of the soil-fixing mesh mat and coconut fiber blanket for the inner slope of the embankment according to claim 1 is characterized in that: Step S101 includes: After the embankment slope is trimmed according to the preset slope, the slope surface is graded and leveled; After fertilizing the leveled slope, lay 20mm to 30mm thick topsoil with water retaining agent and compact it; Anchor trenches were excavated at the top and bottom of the slope with a depth of 30 cm and a width of 15 cm along the direction of water flow.

3. The combined protection construction method of the soil-fixing mesh mat and coconut fiber blanket for the inner slope of the embankment according to claim 1 is characterized in that: In step S102: Evenly mix tall fescue seeds and ryegrass seeds in a ratio of 1:2 and sow them on the topsoil. After covering with a 5mm to 10mm thick layer of soil, compact it and water it for maintenance.

4. The combined protection construction method of the soil-fixing mesh mat and coconut fiber blanket for the inner slope of the embankment according to claim 1 is characterized in that: In step S103, The coconut fiber carpet is laid from the top of the slope downwards using the overlapping method, and is fixed to the slope surface using U-shaped nails.

5. The combined protection construction method of the soil-fixing mesh mat and coconut fiber blanket for the inner slope of the embankment according to claim 4 is characterized in that: The coconut fiber carpet is laid longitudinally on the slope surface, and the top is buried in the anchoring trench; The overlapping method is used for the joints of the coconut fiber blanket, and the middle joints and seams of the coconut fiber blanket are reinforced with U-shaped nails; wherein, the overlapping width of the coconut fiber blanket during the overlapping treatment is not less than 15cm.

6. The combined protection construction method of the soil-fixing mesh mat and coconut fiber blanket for the inner slope of the embankment according to claim 1 is characterized in that: The three-dimensional soil-fixing mesh mat is unfolded and laid on the fixed coconut fiber carpet in accordance with the slope direction of the slope surface, and the upper and lower ends of the three-dimensional soil-fixing mesh mat are buried in the anchoring trenches at the top and bottom of the slope respectively, and the three-dimensional soil-fixing mesh mat is fixed to the coconut fiber carpet with U-shaped nails; among which, the overlap width of adjacent three-dimensional soil-fixing mesh mats is 10cm.

7. The combined protection construction method of the soil-fixing mesh mat and coconut fiber blanket for the inner slope of the embankment according to claim 1 is characterized in that: In step S104, Sprinkler belts are laid on the slope for uniform watering and maintenance, and the watering maintenance cycle is 3 to 4 weeks.

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