Red clay slope ecological restoration structure and construction method

Abstract

The invention belongs to the technical field of red clay side slope protection, and relates to a red clay side slope ecological restoration structure and a construction method.The red clay side slope ecological restoration structure comprises a red clay side slope body and a red clay body, and an impermeable layer, a plant root system growth layer, an improved red clay mixing layer and a plant seed mixture are sequentially overlaid and laid on the side slope of the red clay side slope body; a first retaining wall acting layer is arranged at the bottom of the red clay slope body, and an improved red clay coping is arranged at the top of the red clay slope body. A novel ecological restoration material is prepared by compounding and adding a certain amount of high-molecular curing agent, polyacrylamide, lignin and charcoal and a certain amount of fibers and multiple low-carbon improvement materials with a certain length into the red clay, and the red clay is subjected to physical and mechanical improvement and is matched with vegetation planting to complete ecological restoration. Red clay resource utilization is effectively improved, resource consumption is reduced, cost is reduced, the road environment is beautified, air quality is improved, and the negative influence on the environment caused by reduction of soil humidity of side slopes along the line is adjusted.

Description

Technical Field

[0001] The invention relates to the technical field of red clay slope protection, and in particular to a red clay slope ecological restoration structure and a construction method. Background Art

[0002] Red clay is a carbonate rock red soil, which is widely distributed in the Yunnan-Guizhou Plateau in China and its adjacent central and western Guangxi and western Hunan. Red clay has the characteristics of high natural water content, high liquid limit and plasticity index, poor water stability and compaction, and easy shrinkage and cracking. As a result, the surface cracks of the red clay slope are easily softened by water in a hot and humid environment, and the surface cracks develop and penetrate, eventually leading to the collapse and cracking of the surface soil, forming rainwater infiltration channels, which easily cause soil erosion and slope instability in the rainy season, seriously affecting the stability and safety of the project.

[0003] The existing red clay slope protection is mainly engineering protection, including protective measures such as plastering, spraying, grouting, stone masonry, etc., which are effective in maintaining the initial stability of the slope and resisting rain erosion. However, with the passage of time, the weathering of rocks and concrete on the engineering protection slope will reduce their strength or even damage them. Therefore, it cannot fundamentally solve the problem of the initiation, development and penetration of surface cracks in the red clay slope under humid and hot environment, which ultimately leads to a decrease in the overall stability and safety of the slope. Engineering protection is inanimate protection, which cannot meet the requirements of the environment and landscape, nor can it utilize red clay as a resource, and the construction cost is relatively high. Summary of the invention

[0004] In order to solve the above existing technical problems, the present invention provides a red clay slope ecological restoration structure and a construction method.

[0005] The technical solution of the present invention is realized by the following scheme: a red clay slope ecological restoration structure, comprising a red clay slope body, wherein an anti-seepage layer, a plant root growth layer, an improved red clay mixed layer and a plant seed mixture are sequentially stacked and laid at the side slope of the red clay slope body, a first retaining wall function layer is arranged at the bottom of the red clay slope body, and an improved red clay cap is arranged at the top of the red clay slope body; The plant root growth layer comprises a water-retaining soil-solidifying layer and a plant nutrient solution mixed layer, wherein the water-retaining soil-solidifying layer is laid on the anti-seepage layer, and the plant nutrient solution mixed layer is located between the water-retaining soil-solidifying layer and the improved red clay mixed layer.

[0006] Through the above technical scheme, according to the strength characteristics, crack characteristics, water stability, swelling and shrinkage and suitability for plant growth of red clay, a certain amount of polymer curing agent, polyacrylamide, lignin, biochar and a certain amount and length of fiber low-carbon improved materials are added to the red clay to prepare new ecological restoration materials, and the red clay is physically and mechanically improved and coordinated with vegetation planting to complete ecological restoration, effectively improving the resource utilization of red clay, reducing resource consumption, reducing construction costs and maintenance costs, beautifying the road environment, enriching and coordinating the landscape, absorbing exhaust gas, purifying the air, improving air quality, regulating the humidity of the soil along the slopes, and reducing the negative impact on the environment.

[0007] Preferably, the improved red clay mixed layer is made by mixing lignin fiber, polyacrylamide, water and natural red clay; The water-retaining soil-solidifying layer is made of CHF curing agent and natural red clay; The plant nutrient solution mixed layer is made by mixing a CHF curing agent, a water retaining agent, straw fiber, peat, water and natural red clay.

[0008] Preferably, a second retaining wall function layer is provided on a side of the first retaining wall function layer away from the red clay slope body, a drainage ditch is provided between the first retaining wall function layer and the second retaining wall function layer, and the second retaining wall function layer is erected on the red clay soil body; A flow channel is provided at the first retaining wall function layer near the anti-seepage layer, and a plurality of drainage ports are provided at one side of the first retaining wall function layer near the intercepting ditch, wherein the drainage ports are connected to the flow channel. The construction method of the red clay slope ecological restoration structure comprises the following specific processing steps: S1, level the surface of the slope soil and remove the stones and protrusions on the surface of the slope soil; S2, laying of anti-seepage layer; S3, prefabricate improved red clay and lay the plant root growth layer; S4, prefabricate and lay the improved red clay mixed layer; S5, laying plant seed mix; S6, the first retaining wall layer, the second retaining wall layer and the intercepting ditch are arranged at the bottom of the slope; S7, improved red clay capping is set on the top of the slope.

[0009] Preferably, the specific steps of step S2 include: S201, spraying W-OH curing agent on the leveled slope surface to form an impermeable layer; S202, after standing still, laying a fixed geogrid layer on the impermeable layer; S203, the impermeable layer and the geogrid layer are combined to form an anti-seepage layer.

[0010] Preferably, the specific laying steps of step S3 include: S301: After prefabricated improved red clay is stirred, it is laid; S302, laying a water-retaining soil-solidifying layer with a thickness of 25 to 30 cm; S303, laying a plant nutrient solution mixed layer with a thickness of 5 to 10 cm on the water-retaining soil-solidifying layer.

[0011] Preferably, the water-retaining soil-solidifying layer is red clay improved by CHF curing agent with a dosage of 0.02%; The plant nutrient solution mixed layer is a uniform solution formed by mixing 0.02% CHF curing agent and 0.02% water retaining agent with water, and then pouring straw fiber and peat into natural red clay that has been air-dried, crushed and sieved, and stirring evenly, finally pouring the solution into the mixture and stirring evenly, putting it into a plastic bag, sealing it, and stuffing it for 24 hours to form improved red clay.

[0012] Preferably, in step S4, the modified red clay mixed layer is a mixture of 2% lignin fiber and 1% polyacrylamide mixed with water to form a uniform solution, and then natural red clay that has been air-dried, crushed and sieved is poured in, and the mixture is fully stirred for ≥15 minutes manually, sealed in a plastic bag, and stuffed for 24 hours to form a mixed modified red clay; Then the improved red clay mixed layer is laid.

[0013] Preferably, the specific laying steps of step S6 include: S601, laying the first retaining wall action layer at the bottom of the red clay slope body; S602, opening a flow channel and a drainage port on the first retaining wall working layer, and communicating with the anti-seepage layer; S603, build the second retaining wall working layer on the red clay soil; S604; Making soil-fixing materials to improve red clay; S605: Use soil-fixing materials to improve red clay and lay out the gap between the first retaining wall working layer and the second retaining wall working layer to form a drainage ditch.

[0014] Preferably, in step S604, the soil-fixing material for improving the red clay layer is based on ordinary Portland cement, 0.02% CHF curing agent, 0.5% polypropylene fiber and a water-cement ratio of 0.5, which is evenly mixed with natural red clay that has been air-dried, crushed and sieved, packed into a plastic bag, sealed, and sealed for 24 hours to form a mixture.

[0015] In summary, the present invention has the following beneficial effects: 1. The present invention prepares a novel ecological restoration material by compounding a certain amount of polymer curing agent, polyacrylamide, lignin, biochar and a certain amount and length of fiber low-carbon improved materials into the red clay according to the strength characteristics, crack characteristics, water stability, swelling and shrinkage and suitability of plant growth of red clay, and physically and mechanically improves the red clay and cooperates with vegetation planting to complete ecological restoration, effectively improving the resource utilization of red clay, reducing resource consumption, reducing cost and maintenance costs, beautifying the road environment, enriching and coordinating the landscape, absorbing exhaust gas, purifying the air, improving air quality, regulating the humidity of the soil along the slope, and reducing the negative impact on the environment.

[0016] 2. Adding lignin fiber and polyacrylamide to the red clay for improvement can significantly improve the aggregate structure and soil cohesion of the red clay. It can not only strengthen the soil structure of the slope, improve its shear strength and anti-slip ability, but also further stabilize the soil through plant growth, reduce soil erosion, and thus significantly improve the stability of the slope.

[0017] 3. The straw fiber and peat in the plant nutrient solution mixing layer increase the organic matter content of the soil, improve the soil fertility, provide a good growth environment for vegetation, promote the recovery and growth of vegetation, and cooperate with the water-retaining and soil-solidifying layer to form a water regulation system for ecological prevention and control.

[0018] 4. CHF curing agent is used to improve red clay, which can react chemically with the particles in the red clay, fill the gaps between the red clay particles, stabilize the active ingredients in the red clay, and reduce its expansion and contraction under hot and humid conditions, thereby maintaining the stability and safety of the slope, improving the shear strength, compressive strength and tensile strength of the red clay, and enhancing the strength of the red clay slope, so that the entire ecological restoration structure has better durability and weathering resistance, overcoming and avoiding the traditional use of large amounts of non-renewable resources such as rocks and concrete for slope protection, extending the service life and reducing construction costs.

[0019] 5. The combined effects of surface vegetation, anti-seepage layer and various improved red clay layers effectively reduce the direct scouring and penetration of rainwater on the slope. The drainage is carried out in conjunction with the flow channels and drainage outlets on the first retaining wall layer, which enhances the slope's ability to resist rainwater erosion, prevents the accumulation and penetration of rainwater on the slope, and reduces the risk of slope instability caused by rainwater. Finally, the drainage is guided by the intercepting ditch to further prevent water accumulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the construction process of the present invention.

[0021] Explanation of the reference numerals in the accompanying drawings: 1. Red clay slope body; 2. Improved red clay top; 3. Improved red clay mixed layer; 4. Plant root growth layer; 5. Impermeable layer; 6. Geogrid layer; 7. First retaining wall function layer; 8. Plant seed mixture; 9. Intercepting ditch; 10. Second retaining wall function layer; 11. Drainage outlet; 12. Flow channel; 13. Red clay soil body. DETAILED DESCRIPTION

[0022] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure. The present invention is further described in detail below in conjunction with the accompanying drawings.

[0024] Example 1: A red clay slope ecological restoration structure, such as Figure 1 As shown, it includes a red clay slope body 1 and a red clay soil body 13. The red clay slope body 1 is sequentially stacked with an anti-seepage layer, a plant root growth layer 4, an improved red clay mixed layer 3 and a plant seed mixture 8. The bottom of the red clay slope body 1 is provided with a first retaining wall layer 7. The top of the red clay slope body 1 is provided with an improved red clay top 2. The plant root growth layer 4 includes a water-retaining soil-solidifying layer and a plant nutrient solution mixed layer. The water-retaining soil-solidifying layer is laid on the anti-seepage layer. The plant nutrient solution mixed layer is located between the water-retaining soil-solidifying layer and the improved red clay mixed layer 3. Three layers are arranged on the slope for ecological prevention and control. The surface layer is the improved red clay mixed layer 3 and the plant seed mixture 8, which adopt vegetation to resist scour. The middle layer is the plant root growth layer 4, which provides a good growth environment and fixed support for the vegetation roots. The improved red clay mixed layer 3 is made of lignin fiber, polyacrylamide, water and natural red clay; the water-retaining soil-fixing layer is made of CHF curing agent and natural red clay; the plant nutrient solution mixed layer is made of CHF curing agent, water-retaining agent, straw fiber, peat, water and natural red clay, which can quickly restore the vegetation coverage of the slope and further improve the ecological environment of the slope through the ecological effects of vegetation (such as transpiration, root soil fixation, etc.). The bottom layer is the anti-seepage layer to prevent water from penetrating into the red clay slope body 1 and causing landslides. After the layout is completed, the overall top is pressed.

[0025] A second retaining wall layer 10 is provided on the side of the first retaining wall layer 7 away from the red clay slope body 1, a drainage ditch 9 is provided between the first retaining wall layer 7 and the second retaining wall layer 10, the second retaining wall layer 10 is erected on the red clay soil body 13, a flow channel 12 is provided near the anti-seepage layer of the first retaining wall layer 7, a plurality of drainage ports 11 are provided on the side of the first retaining wall layer 7 near the drainage ditch 9, the drainage ports 11 are connected to the flow channels 12, and water is discharged into the drainage ditch 9, and the soil softening and landslide risks caused by water infiltration are reduced in cooperation with the anti-seepage layer. At the same time, the drainage ditch 9 can also collect and guide the water flow on the slope to prevent water accumulation, further The probability of disasters such as landslides is further reduced. The infiltrated water slides down from the anti-seepage layer and flows into the flow channel 12 of the first retaining wall action layer 7, and is discharged through the drain outlet 11. The flow channel 12 of the first retaining wall action layer 7 is circular and is arranged every 1m on the first retaining wall action layer 7, ensuring the uniformity and efficiency of the drainage system and being able to quickly drain the water. The second retaining wall action layer 10 is in an inverted "L" shape and is erected on the red clay body 13. The first retaining wall action layer 7 and the second retaining wall action layer 10 are both made of red clay improved by CHF curing agent, which can effectively improve the mechanical properties and anti-seepage properties of red clay, thereby enhancing the overall stability of the slope.

[0026] A multi-layer structure is laid on the slope of the red clay slope body 1 to carry out ecological restoration, effectively reduce cracks on the slope surface, consolidate the slope, improve the overall stability and safety of the project, improve the resource utilization of red clay, reduce resource consumption, reduce cost and maintenance costs, beautify the road environment, enrich and coordinate the landscape, absorb exhaust gas, purify the air, improve air quality, regulate the humidity of the soil along the slope, reduce the negative impact on the environment, and form a virtuous circle of sustainable development between engineering construction and environmental protection.

[0027] Embodiment 2: A construction method for a red clay slope ecological restoration structure, such as Figure 1-Figure 2 As shown, the following steps are included: S1, level the surface of the slope soil and remove the stones and protrusions on the surface of the slope soil; The surface of the main body of the red clay slope is leveled, and the stone protrusions on the surface of the slope soil are removed and compacted for subsequent paving.

[0028] S2, laying of anti-seepage layer; S201, spraying W-OH curing agent on the leveled slope surface to form an impermeable layer 5; S202, after standing still, laying a fixed geogrid layer 6 on the impermeable layer 5; S203, the impermeable layer 5 and the geogrid layer 6 are combined to form an anti-seepage layer.

[0029] The anti-seepage layer includes an impermeable layer 5 and a geogrid layer 6. The material of the impermeable layer 5 is W-OH curing agent. The geogrid layer 6 is laid on the impermeable layer 5. The W-OH polymer curing agent is sprayed on the leveled slope surface and left to stand for about ten minutes to form the impermeable layer 5. Then the geogrid layer 6 is paved and a fixing nail is hammered in per square meter to complete the anti-seepage reinforcement of the bottom layer. After the W-OH curing agent reacts with water and solidifies, a tight solidified layer can be formed, which can effectively prevent the penetration of water.

[0030] S3, prefabricate improved red clay and lay plant root growth layer 4; S301: After prefabricated improved red clay is stirred, it is laid; S302, laying a water-retaining soil-solidifying layer with a thickness of 25 to 30 cm; S303, laying a plant nutrient solution mixed layer with a thickness of 5 to 10 cm on the water-retaining soil-solidifying layer.

[0031] The water-retaining and soil-solidifying layer is red clay improved with a CHF curing agent at a dosage of 0.02%; the plant nutrient solution mixing layer is a uniform solution formed by mixing a CHF curing agent at a dosage of 0.02% and a water-retaining agent at a dosage of 0.02% with water, and then pouring straw fiber and peat into the natural red clay that has been air-dried, crushed and sieved, and stirring evenly. Finally, pouring the solution into the mixture and stirring evenly, putting it into a plastic bag and sealing it, and then stuffing it for 24 hours to form the improved red clay.

[0032] The plant root growth layer 4 is composed of a water-retaining soil-solidifying layer and a plant nutrient solution mixed layer. The thicker water-retaining soil-solidifying layer can store more water, reduce water evaporation, and provide a continuous water supply for the plant roots. Sufficient soil layer thickness increases the mechanical strength of the soil. Appropriate soil layer thickness can provide sufficient growth space for the plant roots and promote the root system to expand around, thereby enhancing the anti-scouring property. The red clay improved by the CHF curing agent has better structural stability, can resist external pressure, and protect the plant roots from damage. The addition of straw fiber and peat in the plant nutrient solution mixed layer increases the organic matter content of the soil and improves the soil fertility. The thinner plant nutrient solution mixed layer can ensure that nutrients and water are more concentrated, which is conducive to the rapid absorption of the plant roots. The uniform distribution and permeability of the solution enable the roots to fully contact the nutrients and improve the absorption efficiency.

[0033] Vegetation absorbs moisture from the soil through its roots, reducing the penetration of moisture into the lower soil layers. At the same time, the transpiration of vegetation can also consume a large amount of water, further regulating the moisture content in the soil. The water-retaining soil-solidifying layer and the plant nutrient solution mixing layer together constitute a good moisture regulation system. The water-retaining soil-solidifying layer can slow down the rate of water infiltration, while the plant nutrient solution mixing layer can ensure that the vegetation obtains sufficient water and nutrients. The two work synergistically to achieve the goal of middle-layer blocking.

[0034] S4, prefabricate and lay the improved red clay mixed layer 3; In step S4, the improved red clay mixed layer 3 is a mixed red clay formed by mixing 2% lignin fiber and 1% polyacrylamide with water to form a uniform solution, and then pouring in natural red clay that has been air-dried, crushed and sieved, and manually fully stirring for ≥15 minutes, putting it into a plastic bag and sealing it, and then stuffing it for 24 hours to form a mixed red clay; then the improved red clay mixed layer 3 is laid.

[0035] The addition of lignin fiber and polyacrylamide significantly improved the aggregate structure and water retention properties of red clay, and increased the cohesion and shear strength of the soil, thereby forming a red clay mixed layer improved with anti-scouring, erosion and runoff inhibition materials, which in conjunction with subsequently planted vegetation constitutes surface drainage.

[0036] Combining the effects of different soil conditioners and based on the treatment principle of "surface drainage, middle layer sealing, and bottom layer reinforcement", it brings ecological restoration and fixed protection to the red clay slope as a whole.

[0037] S5, laying plant seed mixture 8; The plant seed mixture 8 is spread at a depth of 5 to 10 cm to ensure that the seeds can fully contact the soil, while avoiding excessive thickness that causes fierce competition between seeds and thus affects growth.

[0038] S6, the first retaining wall layer 7, the second retaining wall layer 10 and the intercepting ditch 9 are arranged at the bottom of the slope; S601, laying the first retaining wall action layer 7 at the bottom of the red clay slope body 1; S602, opening a flow channel 12 and a drainage port 11 on the first retaining wall working layer 7, and communicating with the anti-seepage layer; S603, constructing a second retaining wall working layer 10 on the red clay soil body 13; The second retaining wall layer 10 is set up on the outer red clay body 13 and is semi-enclosed, which can effectively prevent water from entering the outer red clay body 13 when the first retaining wall layer 7 is drained. The red clay body 13 and the second retaining wall layer 10 cooperate with each other to help enhance the stability of the retaining wall structure and prevent the wall from tilting or collapsing.

[0039] S604, making soil-fixing materials to improve red clay, S605, using soil-fixing material to improve red clay to arrange and trim the gap between the first retaining wall function layer 7 and the second retaining wall function layer 10 to form a water intercepting ditch 9.

[0040] In step S604, the soil-fixing material for improving the red clay layer is ordinary Portland cement, 0.02% CHF curing agent, 0.5% polypropylene fiber and a water-cement ratio of 0.5 as a basis, which is evenly mixed with natural red clay that has been air-dried, crushed and sieved, and then packed into a plastic bag and sealed. The mixture is formed after the material is stuffed for 24 hours. Ordinary Portland cement preferably uses 425 ordinary Portland cement to effectively prevent seepage and guide water.

[0041] The hydration products of cement and curing agent can fill the pores of red clay and improve its density and strength. The addition of polypropylene fiber further enhances the toughness and crack resistance of the mixture. The water-cement ratio of 0.5 can ensure that the cement and curing agent are fully hydrated while avoiding excessive free water that may lead to a decrease in soil strength.

[0042] S7, improved red clay capping 2 is set on the top of the slope, A small compacting machine is used to compact the top. Improved red clay compaction 2 uses red clay improved by CHF polymer curing agent for compaction to overcome the poor compaction characteristics of red clay. The compaction width is 10cm and the compaction thickness is 10-15cm. The setting of the compaction enhances the overall stability of the slope and improves its ability to resist external loads.

[0043] Red clay improved by CHF polymer curing agent has better adaptability to hot and humid environment, and has good plasticity and workability. The construction is simpler and faster, reducing the investment of manpower and material resources and reducing construction costs.

[0044] The preferred sieve for natural red clay after air drying and grinding is a 2mm square hole sieve. Red clay often has developed cracks and has strong expansion and contraction properties. The 2mm square hole sieve has a moderate aperture and meets the requirements of screening and curing agent stirring and mixing.

[0045] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A red clay slope ecological restoration structure, characterized by: The invention comprises a red clay slope body (1), wherein an anti-seepage layer, a plant root growth layer (4), an improved red clay mixed layer (3) and a plant seed mixture (8) are sequentially stacked and laid at the side of the red clay slope body (1), a first retaining wall function layer (7) is provided at the bottom of the red clay slope body (1), and an improved red clay capping layer (2) is provided at the top of the red clay slope body (1); The plant root growth layer (4) comprises a water-retaining soil-solidifying layer and a plant nutrient solution mixed layer, the water-retaining soil-solidifying layer is laid on the anti-seepage layer, and the plant nutrient solution mixed layer is located between the water-retaining soil-solidifying layer and the improved red clay mixed layer (3).

2. A red clay slope ecological restoration structure according to claim 1, characterized in that: The improved red clay mixed layer (3) is made by mixing lignin fiber, polyacrylamide, water and natural red clay; The water-retaining soil-solidifying layer is made of CHF curing agent and natural red clay; The plant nutrient solution mixed layer is made by mixing a CHF curing agent, a water retaining agent, straw fiber, peat, water and natural red clay.

3. A red clay slope ecological restoration structure according to claim 1, characterized in that: A second retaining wall function layer (10) is provided on the side of the first retaining wall function layer (7) away from the red clay slope body (1), a drainage ditch (9) is provided between the first retaining wall function layer (7) and the second retaining wall function layer (10), and the second retaining wall function layer (10) is erected on the red clay soil body (13); A flow channel (12) is provided on the first retaining wall function layer (7) near the anti-seepage layer, and a plurality of drainage openings (11) are provided on one side of the first retaining wall function layer (7) near the intercepting ditch (9), wherein the drainage openings (11) are connected to the flow channel (12).

4. A construction method for a red clay slope ecological restoration structure, characterized in that: The construction of the red clay slope ecological restoration structure described in claim 2 comprises the following steps: S1, level the surface of the slope soil and remove the stones and protrusions on the surface of the slope soil; S2, laying of anti-seepage layer; S3, prefabricated improved red clay, laying the plant root growth layer (4); S4, prefabricate and lay the improved red clay mixed layer (3); S5, laying plant seed mixture (8); S6, laying out a first retaining wall layer (7), a second retaining wall layer (10) and a drainage ditch (9) at the bottom of the slope; S7, a modified red clay cap is set on the top of the slope (2).

5. The construction method of a red clay slope ecological restoration structure according to claim 4 is characterized in that: The specific steps of step S2 include: S201, spraying W-OH curing agent on the leveled slope surface to form an impermeable layer (5); S202, after standing still, laying a fixed geogrid layer (6) on the impermeable layer (5); S203, the impermeable layer (5) and the geogrid layer (6) are combined to form an anti-seepage layer.

6. The construction method of a red clay slope ecological restoration structure according to claim 4 is characterized by: The specific laying steps of step S3 include: S301: After prefabricated improved red clay is stirred, it is laid; S302, laying a water-retaining soil-solidifying layer with a thickness of 25 to 30 cm; S303, laying a plant nutrient solution mixed layer with a thickness of 5 to 10 cm on the water-retaining soil-solidifying layer.

7. The construction method of a red clay slope ecological restoration structure according to claim 6 is characterized by: The water-retaining soil-solidifying layer is red clay improved by CHF curing agent with a dosage of 0.02%; The plant nutrient solution mixed layer is a uniform solution formed by mixing 0.02% CHF curing agent and 0.02% water retaining agent with water, and then pouring straw fiber and peat into natural red clay that has been air-dried, crushed and sieved, and stirring evenly, finally pouring the solution into the mixture and stirring evenly, putting it into a plastic bag, sealing it, and stuffing it for 24 hours to form improved red clay.

8. The construction method of a red clay slope ecological restoration structure according to claim 4 is characterized by: In step S4, the improved red clay mixed layer (3) is a mixture of 2% lignin fiber and 1% polyacrylamide mixed with water to form a uniform solution, and then natural red clay that has been air-dried, crushed and sieved is poured into it, and the mixture is fully stirred manually for ≥15 minutes, put into a plastic bag, sealed, and stuffed for 24 hours to form a mixed red clay; Then the improved red clay mixed layer (3) is laid.

9. The construction method of a red clay slope ecological restoration structure according to claim 4, characterized in that: The specific laying steps of step S6 include: S601, laying a first retaining wall working layer (7) at the bottom of the red clay slope body (1); S602, opening a flow channel (12) and a drainage port (11) on the first retaining wall working layer (7), and communicating the flow channel (12) and the drainage port (11) with the anti-seepage layer; S603, constructing a second retaining wall working layer (10) on the red clay soil body (13); S604, making soil-fixing materials to improve red clay; S605, using soil-fixing material to improve red clay to arrange and repair the gap between the first retaining wall working layer (7) and the second retaining wall working layer (10), so as to form a water intercepting ditch (9).

10. The construction method of a red clay slope ecological restoration structure according to claim 9, characterized in that: In step S604, the soil-fixing material for improving the red clay layer is based on ordinary Portland cement, 0.02% CHF curing agent, 0.5% polypropylene fiber and a water-cement ratio of 0.5, which is evenly mixed with natural red clay that has been air-dried, crushed and sieved, packed into a plastic bag, sealed, and sealed for 24 hours to form a mixture.

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