Wetland slope protection structure for carrying out multi-step terrain transformation by utilizing sludge
By carrying out multi-stage terrain modification within the wetland, utilizing silt and plastic geocell slope protection structures, and combining them with plant planting, the problems of silt transportation and disposal in wetland construction were solved, thereby improving stability and purification effects.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- POWERCHINA BEIJING ENG CORP
- Filing Date
- 2025-05-06
- Publication Date
- 2026-04-17
AI Technical Summary
In existing technologies, the transportation and disposal of silt in wetland construction leads to slow construction progress, environmental pollution and waste of land resources. Furthermore, the silt has high fluidity and weak bearing capacity, which affects construction safety and cost.
A multi-tiered terrain modification structure is adopted, which uses silt to modify the terrain inside the wetland, combined with plastic geocells and ceramsite slope protection, and planting emergent and submerged plants to form a stable slope protection structure.
This approach enables the on-site utilization of silt, reduces construction costs and environmental pollution risks, enhances the stability of wetland slopes and water purification capabilities, and improves the landscape effect and ecosystem diversity.
Smart Images
Figure CN224132848U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of constructed wetland technology, specifically to a wetland slope protection structure that utilizes silt for multi-step terrain modification. Background Technology
[0002] With the continuous advancement of urbanization, the discharge of domestic sewage has increased significantly, leading to the construction of numerous sewage treatment facilities across various regions. Constructed wetlands, as an eco-friendly sewage treatment method, can not only comprehensively utilize physical, chemical, and biological methods to filter, adsorb, and degrade pollutants in water, but also improve the quality of the urban landscape environment. Therefore, the construction of constructed wetlands is becoming increasingly common.
[0003] Currently, the construction process for artificial wetlands involves several steps: first, dewatering to ensure dry conditions for construction; then, using machinery to modify the terrain; and finally, planting wetland vegetation. However, due to the impact of domestic sewage discharge and agricultural activities, the nutrient content in the water increases, accelerating the formation and accumulation of sediments, ultimately resulting in silt at the bottom of the wetland. Directly modifying the terrain on this silt poses a risk of landslides and slope collapses. Furthermore, silt is highly mobile and has low load-bearing capacity, making it easy for construction machinery to sink and affecting construction progress. Therefore, dredging is often necessary before terrain modification, involving the removal and transport of silt from the wetland to a silt drying plant for disposal. However, silt spillage during transportation can cause environmental pollution, and the long processing time at the silt drying plant leads to the waste of land resources.
[0004] Therefore, a wetland slope protection structure that utilizes silt for multi-step terrain modification is proposed to realize the on-site utilization of silt in wetlands. Utility Model Content
[0005] To address the shortcomings of existing technologies, this utility model provides a wetland slope protection structure that utilizes silt for multi-stage terrain modification. This addresses the difficulties in wetland construction caused by limitations in construction costs and slope stability. While ensuring slope stability during wetland terrain modification, it effectively utilizes the silt within the wetland, thereby improving the engineering efficiency of wetland construction and reducing construction costs.
[0006] The technical solution adopted in this utility model is as follows:
[0007] This utility model provides a wetland slope protection structure that utilizes silt for multi-stage terrain modification. A two-stage stepped vegetation planting platform is set from the bank slope to the bottom plate of the water passage in the center of the wetland, namely a first-stage step (1) and a second-stage step (2). The slopes of the first-stage step (1) and the second-stage step (2) are both equipped with slope protection structures (5). Wooden piles (6) of the first-stage step platform are set at the connection between the first-stage step (1) and its slope protection structure (5). Wooden piles (7) of the second-stage step platform are set at the connection between the second-stage step (2) and its slope protection structure (5).
[0008] As a further description of the technical solution of this utility model, the first-level step (1) is planted with emergent plants (3), and the second-level step (2) is planted with submerged plants (4).
[0009] As a further description of the technical solution of this utility model, the top elevation of the first-level step (1) is 50cm to 60cm from the normal water level of the wetland; the top elevation of the second-level step (2) is 180cm to 200cm from the normal water level of the wetland.
[0010] As a further description of the technical solution of this utility model, the first-level step (1) and the second-level step (2) are respectively provided with backfill planting soil (11), wetland backfill undisturbed soil (12), impermeable geotextile (13), wetland backfill silt (14) and wetland undisturbed soil (15) from top to bottom.
[0011] As a further description of the technical solution of this utility model, the volume ratio of the wetland backfill silt (14) to the wetland backfill undisturbed soil (12) is 1:2 to 1:4; the impermeable geotextile (13) is made of HDPE geotextile.
[0012] As a further description of the technical solution of this utility model, the thickness of the backfill planting soil (11) is 30cm to 40cm; the backfill thickness of the wetland backfill undisturbed soil (12) in the first step (1) is 4m, and the backfill thickness of the wetland backfill undisturbed soil (12) in the second step (2) is 2m; the thickness of the impermeable geotextile (13) is 3cm to 4cm.
[0013] The backfill thickness of the wetland silt (14) is 1m.
[0014] As a further description of the technical solution of this utility model, the slope protection structure (5) includes a number of plastic geocells (52) arranged in a spliced manner. In each plastic geocell (52), wetland backfill soil (12) and absorbent material (51) are placed sequentially from bottom to top. The top of the plastic geocell (52) is wrapped with metal wire mesh (53).
[0015] As a further description of the technical solution of the present utility model, the height of the plastic geocell (52) is 25 cm to 30 cm; the volume ratio of the wetland backfilled original soil (12) and the adsorption material (51) is 1:1; the adsorption material (51) is ceramsite with a particle size of 6 mm to 10 mm; the mesh size of the metal wire mesh (53) ranges from 2 mm to 5 mm.
[0016] As a further description of the technical solution of the present utility model, the first-level stepped platform wooden piles (6) are located on the side of the first-level step (1) close to the water passage in the center of the wetland, and the second-level stepped platform wooden piles (7) are located on the side of the second-level step (2) close to the water passage in the center of the wetland, so that the first-level stepped platform wooden piles (6) and the bank slope form a closed area, and at the same time, the second-level stepped platform wooden piles (7) and the first-level stepped platform wooden piles (6) form a closed area; the pile length of the first-level stepped platform wooden piles (6) is 6 m, and the pile top is at the same elevation as the top of the first-level step (1); the pile length of the second-level stepped platform wooden piles (7) is 4 m, and the pile top is at the same elevation as the top of the second-level step (2).
[0017] As a further description of the technical solution of the present utility model, the pile diameters of the first-level stepped platform wooden piles (6) and the second-level stepped platform wooden piles (7) are both 13 cm to 15 cm, and double-row wooden piles are driven in a "pin" structure. The wooden piles are made of Chinese fir wooden piles.
[0018] The present utility model provides a wetland slope protection structure for multi-step terrain transformation using silt, and the beneficial effects brought by it at least include:
[0019] (1) Compared with the traditional engineering mode of first dredging and transporting the wetland silt and then carrying out wetland terrain transformation, the present utility model realizes the in-situ utilization of the silt in the wetland, directly carries out terrain transformation with silt inside the wetland, without transporting the silt to the silt disposal site for centralized disposal, avoiding the waste of land resources caused by silt stacking, while reducing the demand for externally purchased backfill soil for terrain transformation, thereby optimizing the overall process of wetland construction, effectively reducing the investment cost of wetland construction, and at the same time avoiding the environmental pollution problems that may be caused by spillage during the long-distance transportation of silt and backfill soil.
[0020] (2) Using plastic geocells filled with ceramsite to slope protect the wetland not only significantly enhances the anti-scouring ability and anti-landslide stability of the wetland slope, but also makes full use of the unique adsorption characteristics of ceramsite. The porous structure of ceramsite makes it an efficient water purification medium, which can effectively filter and adsorb pollutants such as organic substances and suspended particulate matters in water, thereby purifying the water quality. In addition, the porosity of ceramsite also provides an ideal attachment and breeding place for microorganisms in water, promoting the biodiversity of the wetland ecosystem and further enhancing the balance and stability of the wetland system.
[0021] (3) Emergent and submerged plants purify water by increasing dissolved oxygen levels and absorbing nutrients such as nitrogen and phosphorus. Combining different plants on various levels of terraces can create a pleasing landscape effect. Furthermore, emergent and submerged plants are rich in cellulose and lignin, making them valuable raw materials for biofuel production.
[0022] In summary, the wetland slope protection structure provided by this utility model, which utilizes silt for multi-step terrain modification, not only optimizes the wetland construction process and reduces engineering costs, but also enhances the self-purification capacity of the water body and the landscape effect. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of a wetland slope protection structure that utilizes silt for multi-step terrain modification according to this utility model.
[0024] Figure 2 This is a cross-sectional view (AA) of a wetland slope protection structure that utilizes silt for multi-step terrain modification according to this utility model.
[0025] Figure 3 This is a top view of a wetland slope protection structure that utilizes silt for multi-step terrain modification according to this utility model.
[0026] Figure 4 This is a schematic diagram of a wetland slope protection structure for multi-step terrain modification using silt, according to this utility model.
[0027] Figure 5 This is a schematic diagram of a plastic geocell and the metal wire mesh placed on top in a wetland slope protection structure that utilizes silt for multi-stage terrain modification, according to this utility model.
[0028] In the diagram: 1-First-level terrace; 2-Second-level terrace; 3-Emerging plants; 4-Submerged plants; 5-Slope protection structure; 6-First-level terrace platform timber piles; 7-Second-level terrace platform timber piles; 11-Backfill planting soil; 12-Wetland backfill undisturbed soil; 13-Imperible geotextile; 14-Wetland backfill silt; 15-Wetland undisturbed soil; 51-Absorbent material; 52-Plastic geocell; 53-Metal wire mesh. Detailed Implementation
[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0030] The utility model discloses a wetland slope protection structure for multi-step terrain transformation by using silt. Two-level stepped vegetation planting platforms are arranged from the bank slope to the bottom plate of the water passage in the wetland center, namely the first-level step and the second-level step. The first-level step and the second-level step are respectively filled with backfill planting soil, original wetland backfill soil, anti-seepage geotextile, wetland backfill silt and original wetland soil from top to bottom, so as to effectively utilize the wetland silt, reduce the purchased backfill soil, optimize the construction process and reduce the project cost. Ecological slope protection structures are arranged on the slopes of the first-level step and the second-level step. Plastic geogrid is used for slope stability, and ceramsite is placed therein to adsorb water pollutants. Double-row wooden piles in a "pin" shape are driven at the joints of the first-level step and the second-level step and the ecological slope protection structure to enhance the stability of the steps. This structure realizes the in-situ utilization of silt in the wetland and the water purification effect, has simple construction procedures and low input costs, and can provide a new terrain transformation slope protection structure for the construction project of artificial wetlands.
[0031] The above technical solutions will be described in detail below in combination with the specification drawings and the specific embodiments of the present utility model.
[0032] Embodiment:
[0033] Figure 1 、 Figure 2 and Figure 3 show the structure diagram, sectional view and top view of a wetland slope protection structure for multi-step terrain transformation by using silt of the present utility model. The structure of this embodiment includes a first-level step [1], a second-level step [2], emergent plants [3], submerged plants [4], a slope protection structure [5], first-level step platform wooden piles [6], and second-level step platform wooden piles [7].
[0034] Specifically, two-level stepped vegetation planting platforms are arranged from the bank slope to the bottom plate of the water passage in the wetland center, which are the first-level step [1] and the second-level step [2] in sequence; slope protection structures [5] are arranged on the slopes of the first-level step [1] and the second-level step [2]; first-level step platform wooden piles [6] are arranged at the joint of the first-level step [1] and its slope protection structure [5]; second-level step platform wooden piles [7] are arranged at the joint of the second-level step [2] and its slope protection structure [5].
[0035] For the first-level step [1] and the second-level step [2], backfill planting soil
[11] , original wetland backfill soil
[12] , anti-seepage geotextile
[13] , wetland backfill silt
[14] , and original wetland soil
[15] are sequentially arranged from top to bottom. The slope protection structure [5] includes a plurality of spliced and arranged plastic geogrid chambers
[52] . Wetland backfill original soil
[12] and adsorption material
[51] are sequentially placed in each plastic geogrid chamber
[52] from bottom to top; a metal wire mesh
[53] is wrapped above the plastic geogrid chamber
[52] .
[0036] First, as Figure 1 、 Figure 2As shown, the top elevation of the first-level step 1 is 50cm to 60cm away from the normal water level of the wetland. Emergent plants 3 are planted on the top of the first-level step 1. Emergent plants 3 include one or more combinations of reeds, loosestrife, water onions, cattails and variegated reed.
[0037] The top of the second-level terrace 2 is 180cm-200cm above the normal water level of the wetland. The top of the second-level terrace 2 is planted with submerged plants 4, including one or more combinations of *Myriophyllum spicatum*, *Hydrilla verticillata*, *Hydrilla verticillata*, *Vallisneria natans*, and *Snapdragon*. A terraced landscape effect can be created by planting different vegetation combinations of emergent plants 3 and submerged plants 4. It should be noted that other types of plants can also be planted sequentially.
[0038] Secondly, such as Figure 2 As shown, the undisturbed wetland soil 15 in the first-level step 1 and the second-level step 2 is non-disturbed wetland soil. Mechanical excavation is stopped immediately after reaching the top elevation of the undisturbed wetland soil 15 to avoid over-excavation. Wetland backfill silt 14, excavated from the wetland, is placed on top of the undisturbed wetland soil 15, with a backfill thickness of 1m. A 3cm-4cm thick impermeable geotextile 13 is laid on top of the wetland backfill silt 14. The impermeable geotextile 13 is made of HDPE geotextile. A layer of wetland backfill soil 12 is placed on top of the impermeable geotextile 13. The backfill soil 12 in the first-level step 1 has a thickness of 4m, and the backfill soil 12 in the second-level step 2 has a thickness of 2m. The wetland backfill soil 12 is excavated soil from the original wetland topography to the top elevation of the wetland backfill soil 15, and no external backfill soil needs to be purchased. A layer of planting soil 11 with a thickness of 30cm to 40cm is placed on top of the wetland backfill soil 12. The volume ratio of the wetland backfill silt 14 to the wetland backfill soil 12 is 1:2 to 1:4.
[0039] Finally, as Figure 1 , Figure 3As shown in the figure, the first-level stepped platform wooden piles 6 are located on the side of the first-level step 1 close to the water passage in the wetland center, and the second-level stepped platform wooden piles 7 are located on the side of the second-level step 2 close to the water passage in the wetland center, so that the first-level stepped platform wooden piles 6 and the bank slope form a closed area, and at the same time, the second-level stepped platform wooden piles 7 and the first-level stepped platform wooden piles 6 form a closed area. The first-level stepped platform wooden piles 6 are located on the side of the first-level step 1 close to the water passage in the wetland center. The pile length of the first-level stepped platform wooden piles 6 is 6m, the top elevation is the same as that of the first-level step 1, and the distance from the normal water level is 50cm - 60cm; the second-level stepped platform wooden piles 7 are located on the side of the second-level step 2 close to the water passage in the wetland center. The pile length of the second-level stepped platform wooden piles 7 is 4m, the top elevation is the same as that of the second-level step 2, and the distance from the normal water level is 180cm - 200cm. The pile diameters of both the first-level stepped platform wooden piles 6 and the second-level stepped platform wooden piles 7 are 13cm - 15cm. Double-row wooden piles are driven in a "pin" structure. For the construction of artificial wetlands in the southern region, Chinese fir wooden piles are preferably used, and for the construction of artificial wetlands in the northern region, willow wooden piles are preferably used.
[0040] As Figures 1-5 shown in the figure, a slope protection structure 5 is provided at the slopes of the first-level step 1 and the second-level step 2 of this structure. A plastic geocell 52 is installed in the slope protection structure 5 to enhance the slope stability. The wetland backfilled original soil 12 and the adsorption material 51 are sequentially placed in the plastic geocell 52 from bottom to top. The volume ratio of the wetland backfilled original soil 12 to the adsorption material 51 is 1:1; the adsorption material 51 uses ceramsite with a particle size of 6mm - 10mm.
[0041] Furthermore, the single-piece unfolding height of the plastic geocell 52 is 25cm - 30cm. A small-hole metal wire mesh 53 with a good water permeability and a mesh range of 2mm - 5mm is wrapped above the plastic geocell 52 to prevent the loss of the adsorption material 51, and at the same time filter coarse suspended particles and impurities, prevent blocking the pores of the adsorption material 51, and reduce the adsorption and purification effect of the adsorption material 51.
[0042] The utility model provides a wetland slope protection structure for multi-level terrain transformation using silt, and the beneficial effects it brings at least include:
[0043] (1) Compared with the traditional engineering mode of first dredging and transporting the wetland silt and then carrying out wetland terrain transformation, the utility model realizes the in-situ utilization of the silt in the wetland, directly uses the silt for terrain transformation inside the wetland, without transporting the silt to the silt disposal site for centralized disposal, avoiding the waste of land resources caused by silt stacking, and at the same time reducing the demand for purchased backfill soil for terrain transformation, thereby optimizing the overall process of wetland construction, effectively reducing the investment cost of wetland construction, and at the same time avoiding the environmental pollution problems that may be caused by the spillage of silt and backfill soil during long-distance transportation.
[0044] (2) Using plastic geocells filled with expanded clay aggregate for wetland slope protection not only significantly enhances the erosion resistance and landslide stability of wetland slopes, but also fully utilizes the unique adsorption properties of expanded clay aggregate. The porous structure of expanded clay aggregate makes it a highly efficient water purification medium, effectively filtering and adsorbing pollutants such as organic matter and suspended particulate matter in the water, thereby purifying the water quality. In addition, the porosity of expanded clay aggregate provides an ideal attachment and reproduction site for microorganisms in the water, promoting the biodiversity of the wetland ecosystem and further enhancing the balance and stability of the wetland system.
[0045] (3) Emergent and submerged plants purify water by increasing dissolved oxygen levels and absorbing nutrients such as nitrogen and phosphorus. Combining different plants on various levels of terraces can create a pleasing landscape effect. Furthermore, emergent and submerged plants are rich in cellulose and lignin, making them valuable raw materials for biofuel production.
[0046] In summary, the wetland slope protection structure provided by this utility model, which utilizes silt for multi-step terrain modification, not only optimizes the wetland construction process and reduces engineering costs, but also enhances the self-purification capacity of the water body and the landscape effect.
[0047] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.
Claims
1. A wetland revetment structure for multi-step topography modification using silt, characterized by, Two-tiered vegetation planting platforms are set up from the bank slope to the bottom of the water passage in the center of the wetland, namely the first-level step (1) and the second-level step (2); the slopes of the first-level step (1) and the second-level step (2) are both equipped with slope protection structures (5); the first-level step (1) and its slope protection structure (5) are connected by first-level step platform wooden piles (6); the second-level step (2) and its slope protection structure (5) are connected by second-level step platform wooden piles (7).
2. The wetland revetment structure for multi-step topographic reconstruction using sludge according to claim 1, wherein The first-level terrace (1) is planted with emergent plants (3), and the second-level terrace (2) is planted with submerged plants (4).
3. The wetland revetment structure for multi-step topographic reconstruction using sludge according to claim 1, characterized in that, The top elevation of the first-level step (1) is 50cm to 60cm from the normal water level of the wetland; the top elevation of the second-level step (2) is 180cm to 200cm from the normal water level of the wetland.
4. The wetland revetment structure for multi-step topographic reconstruction using sludge according to claim 1, wherein The first-level step (1) and the second-level step (2) are respectively provided with backfill planting soil (11), wetland backfill undisturbed soil (12), impermeable geotextile (13), wetland backfill silt (14) and wetland undisturbed soil (15) from top to bottom.
5. The wetland revetment structure for multi-step topographic reconstruction using sludge according to claim 4, wherein The volume ratio of the wetland backfill silt (14) to the wetland backfill undisturbed soil (12) is 1:2 to 1:4; the impermeable geotextile (13) is made of HDPE geotextile.
6. The wetland revetment structure using silt for multi-step topographic reconstruction according to claim 4, wherein The thickness of the backfill planting soil (11) is 30cm to 40cm; the thickness of the wetland backfill undisturbed soil (12) in the first step (1) is 4m; the thickness of the wetland backfill undisturbed soil (12) in the second step (2) is 2m; the thickness of the impermeable geotextile (13) is 3cm to 4cm; and the thickness of the wetland backfill silt (14) is 1m.
7. The wetland revetment structure for multi-step topographic reconstruction using sludge according to claim 1, characterized in that, The slope protection structure (5) includes several plastic geocells (52) arranged in a series. Each plastic geocell (52) contains wetland backfill soil (12) and absorbent material (51) arranged from bottom to top. The top of the plastic geocell (52) is covered with a metal wire mesh (53).
8. The wetland revetment structure for multi-step topographic reconstruction using sludge according to claim 7, characterized in that, The height of the plastic geocell (52) is 25cm to 30cm; the volume ratio of the wetland backfill soil (12) to the adsorbent material (51) is 1:1; the adsorbent material (51) is ceramsite with a particle size of 6mm to 10mm; the mesh size of the metal wire mesh (53) is 2mm to 5mm.
9. The wetland revetment structure for multi-step topographic reconstruction using sludge according to claim 1, wherein The first-level step platform wooden pile (6) is located on the side of the first-level step (1) near the central water passage of the wetland, and the second-level step platform wooden pile (7) is located on the side of the second-level step (2) near the central water passage of the wetland, so that the first-level step platform wooden pile (6) and the bank slope form a closed area, and at the same time, the second-level step platform wooden pile (7) and the first-level step platform wooden pile (6) form a closed area; the first-level step platform wooden pile (6) has a pile length of 6m, and the pile top is at the same elevation as the top of the first-level step (1); the second-level step platform wooden pile (7) has a pile length of 4m, and the pile top is at the same elevation as the top of the second-level step (2).
10. The wetland revetment structure for multi-step topographic reconstruction using sludge according to claim 1, wherein The pile diameters of the first-level stepped platform wooden piles (6) and the second-level stepped platform wooden piles (7) are both 13 cm to 15 cm. Double-row wooden piles are driven in a "pin" shape structure, and the wooden piles are Chinese fir wooden piles.