A functional zoning slope protection method based on dredged silt

Abstract

The present invention provides a functional zoning slope protection method based on dredged sludge, belonging to the field of ecological slope protection technology. The method comprises the following steps: measuring the waterline position and cleaning the slope surface; laying material A in the area below the waterline and performing a first wet curing after compaction; laying a mixture of material A and material B in the transition area of ​​the waterline and performing a second wet curing after compaction; laying material B in the area above the waterline and performing a third wet curing after compaction. Material A comprises dredged sludge, activated incinerator slag powder, iron-carbon powder, hemihydrated phosphogypsum, and cement; and material B comprises dredged sludge, plant ash, plant fiber, activated incinerator slag powder, and cement. By optimizing the material formulation and slope protection method, the present invention improves the resource utilization efficiency of dredged sludge while balancing the stability and ecological function of the slope. The method is suitable for slope restoration projects in complex hydrological conditions such as waterfronts and wetlands.

Description

Technical Field

[0001] The present invention relates to the technical field of ecological slope protection, and in particular to a functional zoning slope protection method based on dredged silt. Background Art

[0002] Dredged silt is a common waste in dredging projects, characterized by high moisture content and low solid particle strength. When used directly for slope management, it often faces problems such as insufficient strength, poor crack resistance, and lack of ecological functions. Traditional treatment methods mostly use a single inorganic curing agent. Although it can improve the strength to a certain extent, the material's toughness and adaptability are poor, making it difficult to maintain long-term stability in an environment with large water level fluctuations. Moreover, the materials above the water level line lack ecological functions, making it difficult for slope repair to achieve the expected results of ecological restoration. In addition, existing processes often ignore the changes in the dynamic water level at the construction site, resulting in a mismatch between material performance and actual needs, low resource utilization, and insufficient toughness and crack resistance of bank protection materials. They cannot adapt to environments with large water level fluctuations, easily leading to landslide or instability risks, further reducing the ecological and safety benefits of the project.

[0003] Therefore, there is an urgent need to develop a slope material that takes into account both ecological functions and engineering performance. By optimizing the formula and slope protection methods, the applicability of the material under different water level conditions can be achieved, and the efficiency of resource utilization of dredged silt can be improved, so that it can not only meet the requirements of engineering strength, toughness and crack resistance, but also have good ecological functions to adapt to the complex environment of dynamic water level changes and enhance the ecological and safety benefits of slope management. Summary of the Invention

[0004] In view of the technical problems existing in the background technology, the present invention provides a functional zoning slope protection method based on dredged silt, which aims to solve the technical problems that the existing ecological slope protection materials have insufficient toughness and crack resistance and the slope protection method cannot adapt to environments with large water level fluctuations.

[0005] In a first aspect, the present invention provides a functional zoning slope protection method based on dredged silt, comprising the following steps:

[0006] Measure the water level on the slope and clean the slope;

[0007] Lay material A in the area below the water level and carry out the first wet curing after compaction;

[0008] Lay the mixture of material A and material B in the transition area of ​​the water level line, and carry out the second wet curing after compaction;

[0009] Lay material B in the area above the water level and carry out the third wet curing after compaction;

[0010] Material A comprises, by weight: 30-50 parts of dredged sludge, 25-35 parts of activated incinerator slag powder, 10-15 parts of iron-carbon powder, 5-10 parts of hemihydrate phosphogypsum, and 5-10 parts of cement;

[0011] Material B includes, by weight: 30-50 parts of dredged sludge, 30-50 parts of wood ash, 5-15 parts of plant fiber, 5-10 parts of activated incinerator slag powder, and 1-5 parts of cement.

[0012] Preferably, the mass percentage of material A in the mixture of material A and material B is 40% to 60%.

[0013] Preferably, the mass percentage of material A in the mixture of material A and material B is 50%.

[0014] Preferably, the laying thickness of material A is 15 to 20 cm, the compaction density of material A is ≥90%, the humidity of the first wet curing is 85% to 95%, and the curing time of the first wet curing is 7 to 21 days.

[0015] Preferably, the laying thickness of the mixture of material A and material B is 10 to 15 cm, the compaction density of the mixture of material A and material B is ≥85%, the humidity of the second wet curing is 85% to 95%, and the curing time of the second wet curing is 21 to 28 days.

[0016] Preferably, the laying thickness of material B is 10 to 15 cm, the compaction density of material B is ≥50%, the humidity of the third wet curing is 80% to 90%, and the curing time of the third wet curing is 7 to 14 days.

[0017] In the present invention, wet curing methods include, but are not limited to, the automatic spray system, plastic film covering, and breathable sunscreen cloth listed in the examples. Those skilled in the art can select an appropriate curing method based on the actual project conditions and material properties. Continuous wet curing for a certain period of time can ensure the bonding strength and stability between the various layers of material.

[0018] Preferably, the water level transition area is ±0.5m from the water level; the area above the water level is from the upper boundary line of the water level transition area to the top of the slope; and the area below the water level is from the bottom of the slope to the lower boundary line of the water level transition area.

[0019] Preferably, the activated incineration slag powder includes at least one of alkaline activated incineration slag powder and heat-treated activated incineration slag powder.

[0020] Preferably, the preparation method of alkaline activated incineration slag powder comprises the following steps: soaking the incineration slag powder in an alkaline solution at 10-50° C. for 4-24 hours, filtering and drying to obtain alkaline activated incineration slag powder.

[0021] Preferably, the solid-liquid ratio of the incineration slag powder to the alkaline solution is 1:(5-10); and the concentration of the alkaline solution is 1wt%-5wt%.

[0022] Preferably, the method for preparing heat-treated activated incineration slag powder comprises the following steps: heating the incineration slag powder to 500-800°C in an air atmosphere, holding the temperature for 1-3 hours, and cooling to obtain heat-treated activated incineration slag powder. The heat treatment activates the amorphous phase and promotes the fragmentation of the vitreous structure, thereby releasing the latent hydraulic components. Prior to heat treatment, the slag is preferably crushed to a particle size of less than 100 μm to enhance thermal conductivity and reactivity.

[0023] Preferably, the particle size of wood ash is less than 1 mm; the length of plant fiber is less than 5 cm. The advantages of wood ash particle size less than 1 mm are: on the one hand, smaller particles have a larger specific surface area, which is conducive to the rapid and efficient release of nutrients required by plants such as potassium and calcium, which is convenient for plants to absorb and utilize; on the other hand, fine particles can be more evenly mixed with components such as dredged silt to form a homogeneous plant growth matrix, and help to improve the micropore structure of the matrix. The advantages of plant fiber length less than 5 cm are: first, shorter fibers are less likely to entangle and clump when mixed with other components, ensuring the uniform dispersion of fibers in the material, thereby forming a more effective reinforcement network inside the material and improving the toughness and crack resistance of the material; second, fibers of appropriate length can form pores of appropriate size during the later degradation process, which is conducive to improving the air permeability and water permeability of the material and promoting the growth of plant roots; third, shorter fibers are also more convenient for construction operations and material compaction.

[0024] Preferably, the slope is a waterfront slope or a wetland slope, and the water level fluctuation range of the slope is ±1.5 meters.

[0025] The principle of the technical solution of the present invention is as follows:

[0026] (1) Optimization of the material formula for paving below the water level: activated incinerator slag powder provides a solidifying effect on the foundation, improving the material's hydrolysis resistance and long-term stability; iron-carbon powder enhances the material's density and durability, inhibiting erosion and crack expansion in long-term water immersion; hemihydrated phosphogypsum improves water stability and overall material strength, and reduces the risk of phosphorus dissolution through a slow-release mechanism; cement improves the material's strength and water stability; dredged sludge is used as the main filling base material and skeleton material, which not only realizes the resource utilization of abandoned dredged sludge, but also provides the necessary plasticity and volume for the formula. Its fine particle characteristics help fill the pores between other components and improve the material's density. At the same time, some mineral components in the sludge can participate in or affect the hydration reaction process of the curing agent, making a certain contribution to the final physical and mechanical properties of the material.

[0027] The required foundation strength is maintained below the waterline, while the activation treatment of the incinerator slag is enhanced to improve its water resistance and adapt to the long-term immersion conditions in the wetland environment. By adjusting the ratio of incinerator slag powder to hemihydrate phosphogypsum, the curing reaction time and strength are optimized to ensure long-term stability. The ratio of iron and carbon powder is adjusted according to humidity and corrosion conditions to suppress the formation of interfacial cracks.

[0028] (2) Optimization of the material formula for paving in areas above the water level: Wood ash provides nutrients such as potassium and calcium required for plant growth, and improves soil structure through biological activity; plant fiber enhances toughness and crack resistance, improving the ecological adaptability of slope materials; activated incinerator slag powder enhances the structural strength of the material; dredged silt is mainly used as the basic medium and carrier for plant growth, and its water and fertilizer retention properties are used to provide water and nutrients for plant roots. At the same time, it is also the main component for realizing waste resource utilization, and provides the necessary volume and plasticity for the entire slope protection material, facilitating uniform mixing with ecological improvers such as plant fiber and subsequent construction.

[0029] The materials in the area above the water level line improve their toughness and crack resistance by increasing the proportion of plant fibers and wood ash, while ensuring the degradability of the materials, enhancing their air permeability and biological adaptability, promoting plant growth, and enhancing ecological restoration functions.

[0030] (3) Interface bonding treatment of the transition layer: Between the material below the waterline and the transition layer, mechanical stirring and moderate wetting are used to ensure physical bonding between the two. Since the two are essentially similar solids, seamless connection of the transition zone can be gradually achieved by adjusting the construction ratio. Between the transition layer and the material above the waterline, careful compaction is performed to ensure enhanced interface adhesion.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention optimizes the material composition by deeply analyzing the hydrological conditions and the physical properties of dredged silt, constructing a dual-zone layered formulation design based on below and above the water level and an interface transition layer optimization process. This not only ensures the water stability of the slope material, but also significantly enhances the ecological function of the material, enabling it to have long-term stability and biocompatibility in complex environments. The ecological slope protection method provided by the present invention improves the plant growth environment, promotes root stabilization of the slope, and restores ecological diversity; it efficiently utilizes dredged silt, incineration slag, and plant ash, promoting the high-value-added conversion of industrial by-products; the ecological slope protection method provided by the present invention has construction flexibility, the formulation can be adjusted according to hydrological conditions, and the construction difficulty is low, and the overall cost is low. DETAILED DESCRIPTION

[0033] The following embodiments of the technical solution of the present invention are described in detail. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only used as examples and are not intended to limit the scope of protection of the present invention.

[0034] If no specific techniques or conditions are specified in the examples, the experiments were carried out according to the techniques or conditions described in the literature in the field or according to the product instructions. All reagents or instruments used without specifying the manufacturer are commercially available conventional products.

[0035] In the following examples of the present invention, the incineration slag powder was taken from the incineration residue of a domestic waste incineration plant; the iron-carbon powder was purchased from a commercial enterprise with a particle size of ≤45 μm;

[0036] The plant ash is taken from the ash produced by burning straw in a power plant boiler. The potassium content is ≥4%. After crushing and screening, the particle size is <1mm.

[0037] The plant fiber is natural hemp fiber with a length of less than 5 cm.

[0038] Example 1

[0039] (1) On-site situation

[0040] Geographical location: On the shore of a city lake, with a slope height of about 2.5 meters and a slope of 1:2.

[0041] Hydrological conditions: The water level fluctuation in the construction area is ±1.5 meters, and the average annual frequency of water level changes is 3 times / month.

[0042] Environmental conditions: The surface soil of the lakeshore is loose, the vegetation coverage rate is less than 20%, and the regional soil lacks organic matter and nutrients.

[0043] (2) Material formula design

[0044] Formula of material A for the area below the water level line (by weight): 45 parts of dredged sludge, 25 parts of activated incineration slag powder, 10 parts of iron-carbon powder, 10 parts of hemihydrate phosphogypsum (particle size 100 mesh, purity ≥95%), and 10 parts of cement (PO 42.5).

[0045] Formula of material B for the area above the water level line: 40 parts of dredged sludge, 30 parts of wood ash, 10 parts of plant fiber, 10 parts of activated incinerator slag powder, and 5 parts of cement (PO 42.5).

[0046] The activated incineration slag powder is incineration slag powder that has been alkaline activated. The alkaline activation method is as follows: take the incineration slag powder and 2wt% NaOH solution at a solid-liquid ratio of 1:6, mix them, soak them at room temperature for 12 hours, filter them, and dry them for later use.

[0047] Material formula for the transition layer area: Material A and Material B are mixed in a mass ratio of 1:1.

[0048] (3) Slope protection methods

[0049] ①Pre-construction preparation: measure the water level position, determine the scope of the construction area, clean up the loose soil and debris on the slope, and use an excavator to slightly level the slope; equip with a mobile mixer, compactor and wet curing equipment.

[0050] ②Layered construction

[0051] Construction in the area below the water level (referring to the lower boundary line of the transition area from the bottom of the slope to the water level): Lay the first layer of material A, and use a loader to evenly spread material A on the slope surface with a thickness of 15 cm; finally, use a vibrating compactor to compact the material in sections to ensure that the compaction density is ≥90%; and use an automatic spray system for wet curing, maintaining the humidity at 85%~95%, and the curing time is 14 days.

[0052] Construction in the waterline transition zone (±0.5 m from the waterline): Use mechanical stirring to thoroughly mix Material A and Material B in a 1:1 mass ratio to form a mixture. Use a small compactor to evenly lay the mixture (10 cm thick) and compact it to a density of 85% to 90%. Cover with plastic film to maintain a humidity level of 85% to 95% in the transition layer. Curing should continue for 21 days.

[0053] Construction above the waterline (from the upper boundary of the waterline transition zone to the top of the slope): Lay Material B (10 cm thick) and compact it using a compactor to ensure a density of 50%-60%. Cover the material with a breathable sunscreen sheet and wet-cure for 14 days. Check the moisture content regularly and spray water to prevent the material from drying out, maintaining a humidity level of 80%-90%.

[0054] (4) Implementation effect

[0055] After 28 days of continuous immersion, the material below the waterline experienced a mass loss of less than 3%. The material above the waterline maintained structural integrity after repeated rainfall. Three months after the materials were laid, the plant cover increased significantly from less than 20% before construction to 78%. The average height of the main herbaceous plants in the area increased by 28% compared to the reference area (unconstructed area).

[0056] Example 2

[0057] (1) On-site situation

[0058] Geographical location: Wetland soil, slope height about 3 meters, slope 1:3.

[0059] Hydrological conditions: Water level fluctuation is ±1.2 meters, water level changes slowly, and the average annual change frequency is 2 times / month.

[0060] Environmental conditions: The wetland soil has high water content, a vegetation coverage rate of about 40%, and rich soil organic matter, but the partially exposed surface is susceptible to erosion.

[0061] (2) Material formula design

[0062] The formula of material A for the area below the water level line (by weight): 45 parts of dredged sludge, 28 parts of activated incineration slag powder, 10 parts of iron-carbon powder, 7 parts of hemihydrate phosphogypsum, and 3 parts of cement, mixed evenly in proportion.

[0063] The formula of material B for the area below the water level line (by weight): 50 parts of dredged sludge, 30 parts of wood ash, 10 parts of plant fiber, 7 parts of activated incinerator slag powder, and 3 parts of cement, mixed evenly in proportion.

[0064] The activated incineration slag powder is heat-treated incineration slag powder, and the heat treatment method is as follows: crushing the incineration slag to a particle size of less than 100 μm, heating the incineration slag powder to 650° C. in an air atmosphere and keeping the temperature for 2 hours, and then cooling it for use.

[0065] Transition layer material: Material A and material B are mixed in a mass ratio of 1:1.

[0066] (3) Slope protection methods

[0067] ①Pre-construction preparation: Accurately measure the water level range, take into account the characteristics of slow changes in wetland water levels, ensure clear construction boundaries, remove surface debris from the slope and level it appropriately, pay special attention to retaining the original soil structure to avoid damaging the wetland microbial environment, and prepare small mixers, compaction equipment and wet curing equipment.

[0068] ②Layered construction:

[0069] Construction in the area below the water level (referring to the lower boundary line of the transition area from the bottom of the slope to the water level): Material A is laid with a thickness of 15 cm and compacted lightly using a vibrating compactor with a compaction density ≥ 85%. It should be adapted to the softer soil environment of the wetland and the humidity should be maintained at 85% to 90%. The curing time is 21 days.

[0070] Construction in the transition layer (±0.5m from the waterline): Mix Material A and Material B in a 1:1 mass ratio, stir thoroughly, and lay to a thickness of 12 cm. Lightly compact to ensure a uniform transition between layers, with a compaction density of ≥85%. Cover with plastic film after completion, ensuring the humidity of the transition layer is controlled between 85% and 95%. Curing should continue for 28 days.

[0071] Construction above the waterline (from the upper boundary of the waterline transition zone to the top of the slope): The material should be laid 15 cm thick above the waterline. Use a trowel to level the surface, ensuring a compaction density of 50% or higher. Cover with a breathable sunscreen sheet and wet-cure for 7 days. Regularly check the moisture content and spray water to prevent the material from drying out, maintaining a humidity level of 80% to 90%.

[0072] (4) Implementation effect

[0073] The mass loss rate of materials below the waterline after 28 days of continuous immersion was less than 3.5%, and the material above the waterline showed no cracking. Within six months of construction, the vegetation coverage rate increased from 40% to 95%, and the average height of the main herbaceous plants in the area increased by 32% compared to the reference area (unconstructed area).

[0074] Comparative Example 1

[0075] This comparative example differs from Example 1 in that the following areas, the transition zone, and the above-waterline areas use the same formula (by weight): 40 parts dredged sludge, 30 parts wood ash, 10 parts plant fiber, 10 parts activated incinerator slag powder, and 5 parts cement (PO 42.5). The slope protection method and steps are the same as in Example 1.

[0076] After being continuously immersed in water for 28 days, the materials below the water level began to crack on the slope surface.

[0077] Comparative Example 2

[0078] The difference between this comparative example and Example 1 is that the area below the water level line, the water level line transition area and the area above the water level line use the same formula (in parts by weight): 45 parts of dredged sludge, 25 parts of activated incineration slag powder, 10 parts of iron-carbon powder, 10 parts of hemihydrate phosphogypsum (particle size 100 mesh, purity ≥95%), and 10 parts of cement (PO 42.5).

[0079] Three months after the materials were laid, the vegetation coverage rate was less than 30%, and the ecological restoration effect was unsatisfactory.

[0080] The results of Comparative Examples 1 and 2 show that if the same formulation is used in both areas below and above the waterline (without functional zoning), the material exhibits poor structural continuity, weak interfacial bonding, and poor ecological restoration capabilities under dynamic water level fluctuations. This is due to: 1) The material properties fail to balance the requirements of varying hydrological conditions: If a formulation prioritizes underwater stability, the surface area lacks adequate air permeability, water retention, and nutrient supply, hindering plant growth. If only an ecological formulation prioritizes plant growth is used, the underwater area lacks sufficient hydrolysis resistance, erosion resistance, and mechanical strength to withstand long-term immersion and water flow. 2) Lack of targeted interface treatment: Without functional zoning and a transition layer design, a single material is susceptible to fatigue damage when subjected to repeated environmental stresses such as drying and wetting in the water-level fluctuation zone, leading to cracking, strength degradation, and loss of structural continuity. 3) Ecological functional limitations: A single formulation cannot simultaneously meet the dual goals of underwater stability and above-water vegetation restoration, resulting in poor overall ecological restoration effectiveness and the inability to establish a stable ecotone ecosystem.

[0081] Comparative Example 3

[0082] The difference between this comparative example and Example 1 is:

[0083] Material formula below the water level line (by weight): 60 parts of dredged sludge, 25 parts of activated incineration slag powder, 10 parts of iron-carbon powder, 2 parts of hemihydrate phosphogypsum (particle size 100 mesh, purity ≥95%), and 10 parts of cement (PO 42.5).

[0084] Material formula above the water level line: 10 parts of dredged sludge, 60 parts of wood ash, 10 parts of plant fiber, 10 parts of activated incinerator slag powder, and 5 parts of cement (PO 42.5).

[0085] The slope protection method and steps are the same as those in Example 1.

[0086] The implementation results show that erosion and delamination occurred on the slope surface, and the vegetation coverage rate was less than 10%.

[0087] The erosion, delamination, and reduced vegetation coverage in Comparative Example 3 were caused by: 1) Material failure in the underwater area: Due to the high dredged silt content and low hemihydrate phosphogypsum content, Material A in the underwater area had severely insufficient curing strength and poor hydrolysis resistance. Under long-term immersion and hydrodynamic forces, it rapidly softened, weakened, and even collapsed, losing its bearing capacity as a foundation for the slope structure. This was the primary internal cause of the instability of the overlying structure, erosion, and delamination. 2) The above-water material was unsuitable for plant growth and had poor inherent stability: The high content of plant ash made Material B too alkaline, severely inhibiting plant colonization and growth. This resulted in extremely low vegetation coverage and a lack of root support for the slope. Furthermore, the excessive amount of plant ash also weakened the structural strength and corrosion resistance of this layer, making it prone to loosening and erosion. 3) Interlayer bond failure: The destruction of the underwater foundation layer inevitably led to a loss or sharp weakening of the bond between it and the overlying transition layer or above-water layer. Under external forces such as water level fluctuations and rainfall, the unstable subaqueous layer and the fragile superaqueous layer are prone to relative displacement and separation, a phenomenon known as delamination. The loosening and loss of surface material manifests as erosion. These factors, combined, ultimately lead to the overall failure of the slope protection structure and the loss of its ecological function.

[0088] It should be noted that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments are merely examples, and any embodiments having substantially the same structure and effect as the technical concept within the scope of the technical solution of the present invention are all included in the technical scope of the present invention. In addition, without departing from the scope of the present invention, other embodiments that can be conceived by those skilled in the art and that combine some of the constituent elements in the embodiments are also included in the scope of the present invention.

Claims

1. A functional zoning slope protection method based on dredged silt, characterized in that: The following steps are involved: Measure the water level and clean the slope; Lay material A in the area below the water level and carry out the first wet curing after compaction; Lay the mixture of material A and material B in the transition area of ​​the water level line, and carry out the second wet curing after compaction; Lay material B in the area above the water level and carry out the third wet curing after compaction; The material A comprises, by weight, 30-50 parts of dredged sludge, 25-35 parts of activated incinerator slag powder, 10-15 parts of iron-carbon powder, 5-10 parts of hemihydrate phosphogypsum, and 5-10 parts of cement; The material B comprises, by weight, 30-50 parts of dredged sludge, 30-50 parts of plant ash, 5-15 parts of plant fiber, 5-10 parts of activated incinerator slag powder, and 1-5 parts of cement; The mass percentage of the material A in the mixture of the material A and the material B is 40% to 60%; The activated incineration slag powder includes at least one of alkaline activated incineration slag powder and heat-treated activated incineration slag powder; The particle size of the plant ash is less than 1 mm; the length of the plant fiber is less than 5 cm; The water level transition area is the water level ± 0.5m; the area above the water level is from the upper boundary line of the water level transition area to the top of the slope; the area below the water level is from the bottom of the slope to the lower boundary line of the water level transition area.

2. The functional zoning slope protection method based on dredged silt according to claim 1 is characterized in that: The laying thickness of the material A is 15 to 20 centimeters, the compaction density of the material A is ≥90%, the humidity of the first wet curing is 85% to 95%, and the curing time of the first wet curing is 7 to 21 days.

3. The functional zoning slope protection method based on dredged silt according to claim 1 is characterized in that: The laying thickness of the mixture of material A and material B is 10 to 15 cm, the compaction density of the mixture of material A and material B is ≥85%, the humidity of the second wet curing is 85% to 95%, and the curing time of the second wet curing is 21 to 28 days.

4. The functional zoning slope protection method based on dredged silt according to claim 1 is characterized in that: The laying thickness of the material B is 10 to 15 cm, the compaction density of the material B is ≥50%, the humidity of the third wet curing is 80% to 90%, and the curing time of the third wet curing is 7 to 14 days.

5. The functional zoning slope protection method based on dredged silt according to claim 1 is characterized in that: The preparation method of the alkaline activated incineration slag powder comprises the following steps: soaking the incineration slag powder in an alkaline solution at 10-50° C. for 4-24 hours, filtering and drying to obtain the alkaline activated incineration slag powder.

6. The functional zoning slope protection method based on dredged silt according to claim 1 is characterized in that: The preparation method of the heat-treated activated incineration slag powder comprises the following steps: heating the incineration slag powder to 500-800° C. in an air atmosphere, keeping the temperature for 1-3 hours, and cooling to obtain the heat-treated activated incineration slag powder.

7. The functional zoning slope protection method based on dredged silt according to claim 1 is characterized in that: The slope is a waterfront slope or a wetland slope, and the water level fluctuation range of the slope is ±1.5 meters.