An artificial ecological wetland system and construction method thereof

Abstract

The present application relates to an artificial ecological wetland system, which includes an ecological wetland body, wherein an inlet channel and a drainage channel are arranged in the ecological wetland body, wherein a solid floating sedimentation area, a plant root purification area and a drainage area are arranged in sequence from the inlet channel to the drainage channel in the ecological wetland body, wherein the drainage channel is connected to the drainage area; wherein a stone filling layer, an anti-filtration layer, a backfill soil layer and a riprap layer are laid in sequence in the ecological wetland body, wherein the anti-filtration layer includes a first geotextile layer laid on the stone filling layer, a crushed stone layer laid on the first geotextile layer, a sand and gravel layer laid on the crushed stone layer, and a second geotextile layer laid on the sand and gravel layer, wherein a geogrid is laid on the second geotextile layer, the backfill soil layer is laid on the geogrid, and the riprap layer is laid on the backfill soil layer. The present application has the effect that pollutants deposited in the ecological wetland body are not easy to cause pollution to the bottom of the ecological wetland body and the surrounding soil layers.

Description

Technical Field

[0001] The present application relates to the technical field of artificial ecosystems, and in particular to an artificial ecological wetland system and a construction method thereof. Background Art

[0002] With the rapid development of environmental protection, people have also had a broad understanding of the functions of wetlands; wetlands, as the "kidneys of the earth", are responsible for the purification and treatment of the earth's natural water bodies; artificial wetlands are a comprehensive ecosystem, which is artificially designed and constructed, and is composed of saturated substrates, aquatic vegetation, animals and water bodies. It applies the principles of species symbiosis, material recycling and regeneration, and the principle of structural and functional coordination in ecosystems, and fully taps the production potential of resources, prevents environmental re-pollution, and obtains the best benefits of sewage treatment and resource utilization. Due to the gradual reduction and disappearance of natural wetlands in cities, artificial wetlands have received more and more attention and development with their unique advantages.

[0003] As a new type of ecological sewage purification treatment method, artificial wetland system water purification technology has the basic principle of planting specific wetland plants on artificial wetland fillers to establish an artificial wetland ecosystem. When sewage passes through the wetland system, the pollutants and nutrients in it are absorbed or decomposed by the system, thereby purifying the water quality. At present, artificial wetlands mainly include inlet channels for sewage to enter and drainage channels for purified water to flow out. Artificial wetlands are equipped with purification systems such as ecological islands and ecological sandbanks.

[0004] However, during the use of artificial wetlands, plant roots can only purify water at shallow water levels, and a large amount of harmful pollutants will be deposited at the bottom of the wetland. These pollutants can easily seep into the underground soil layer with the water at the bottom of the wetland, causing pollution to the bottom of the wetland and the surrounding soil layers. Summary of the invention

[0005] In order to solve the problem that pollutants deposited in a wetland system easily cause pollution to the bottom of the wetland and the surrounding soil layers, the present application provides an artificial ecological wetland system and a construction method thereof.

[0006] In the first aspect, the present application provides an artificial ecological wetland system, which adopts the following technical solutions:

[0007] An artificial ecological wetland system comprises an ecological wetland body, wherein an inlet channel and a drainage channel are arranged in the ecological wetland body, wherein a solid floating matter precipitation area, a plant root purification area and a drainage area are arranged in sequence from the inlet channel to the drainage channel in the ecological wetland body, and the drainage channel is connected with the drainage area;

[0008] The ecological wetland body is sequentially provided with a stone filling layer, a filter layer, a backfill soil layer and a riprap layer, the filter layer comprises a first geotextile layer laid on the stone filling layer, a crushed stone layer laid on the first geotextile layer, a sand and gravel layer laid on the crushed stone layer, and a second geotextile layer laid on the sand and gravel layer, a geogrid is laid on the second geotextile layer, the backfill soil layer is laid on the geogrid, and the riprap layer is laid on the backfill soil layer.

[0009] By adopting the above technical scheme, sewage enters the ecological wetland body through the water inlet channel, and some heavier floating objects carried in the water are initially precipitated through the solid floating object sedimentation area, and then the sewage is purified through the plant root purification area. The pollutants deposited in the ecological wetland body are blocked by the riprap layer and the backfill soil layer, and the sewage that penetrates into the ground and is not completely purified is filtered in turn through the backfill soil layer, the second geotextile layer, the sand and gravel layer, the crushed stone layer and the first geotextile layer, thereby effectively preventing the pollutants deposited in the ecological wetland body from infiltrating into the bottom of the ecological wetland body and the surrounding soil layers, causing pollution to the bottom of the ecological wetland body and the surrounding soil layers.

[0010] Optionally, it also includes an eco-bag slope protection system laid on the slope of the ecological wetland body, the eco-bag slope protection system includes a plurality of eco-bags, and the eco-bags are filled with plant growth matrix and plant seeds.

[0011] By adopting the above technical solution, the eco-bag slope protection system forms a layer of environment suitable for plant growth on the slope surface by stacking eco-bags filled with plant growth substrates along the slope surface. Since the slope surface growth environment created by the eco-bag slope protection system is good, herbaceous plants, small shrubs, and even some small trees can grow very well, forming a lush vegetation effect, and at the same time achieving the purpose of soil and water conservation.

[0012] Optionally, the eco-bags close to the slope of the ecological wetland body are fixed to the slope of the ecological wetland body by anchor bolts, and a connecting piece is provided between two adjacent eco-bags, and the connecting piece is used to fix the two adjacent eco-bags.

[0013] By adopting the above technical solution, the eco-bags close to the main slope of the ecological wetland are fixed by anchor bolts, and the two adjacent eco-bags are fixed by connecting pieces, so as to achieve the purpose of strengthening the main slope of the ecological wetland.

[0014] Optionally, the plant growth matrix includes soil and organic fertilizer, wherein the organic fertilizer accounts for 10-15% of the eco-bag, soil particles smaller than 50 mm and larger than 2 mm account for 60-70%, particles larger than 0.05 mm and smaller than 2 mm account for 10-15%, and clay accounts for 0-5%.

[0015] By adopting the above technical solution, the proportion of organic fertilizers and particles of different sizes in the eco-bags is strictly controlled, so that when the plant seeds in the eco-bags grow, the roots of the plants have sufficient oxygen absorption space and a better growth environment, thereby improving the growth state of the plants and the purification effect of the plants on the sewage in the ecological wetland.

[0016] Optionally, a labyrinth channel is provided in the solid floating matter sedimentation area, the water inlet channel is connected to the labyrinth channel, a water outlet is provided on the labyrinth channel, and the horizontal height of the lower wall of the water outlet is higher than the bottom wall of the labyrinth channel.

[0017] By adopting the above technical scheme, when the inlet channel introduces sewage into the ecological wetland body, the sewage first enters the maze channel, and the water flow speed is slowed down by the turns in the maze channel, thereby facilitating the sedimentation of solid floating objects in the sewage. Moreover, since the horizontal height of the lower wall of the outlet is higher than the bottom wall of the maze channel, the pollutants precipitated in the maze channel are not easy to enter the ecological wetland body through the outlet.

[0018] Optionally, a drainage gate chamber is provided in the drainage area, a water inlet is opened in the drainage gate chamber, the drainage channel is connected to the drainage gate chamber, and the interior of the drainage gate chamber is filled with filter material.

[0019] By adopting the above technical solution, the purified water in the ecological wetland body first enters the drainage gate chamber and is filtered through the filter material when being discharged through the drainage channel, thereby improving the purification effect of the ecological wetland body on sewage.

[0020] In the second aspect, the present application provides a construction method of an artificial ecological wetland system, which adopts the following technical solution:

[0021] A construction method of an artificial ecological wetland system comprises the following steps:

[0022] S1. Excavation of foundation pit: dig a foundation pit at the construction location of the wetland ecosystem. The foundation pit is usually located at a lower terrain. After the foundation pit is excavated, the bottom of the foundation pit needs to be leveled and compacted;

[0023] S2, stone filling layer paving, filling and throwing large stones into the foundation pit, so that the stones are spread all over the bottom of the foundation pit, and these stones are compacted and leveled by gravity hammer to form a stone filling layer;

[0024] S3, paving the filter layer, laying the first geotextile layer, crushed stone layer, sand and gravel layer and the second geotextile layer in sequence on the basis of the stone filling layer to form an anti-filter layer, and when laying the crushed stone layer and the sand and gravel layer, the crushed stone layer and the sand and gravel layer need to be leveled respectively;

[0025] S4, laying the backfill soil layer, laying the geogrid on the second geotextile layer, pouring soil on the geogrid, and compacting and leveling the soil to form a backfill soil layer;

[0026] S5, paving the riprap layer. After the backfill soil layer is paved, riprap is placed on the backfill soil layer, and the riprap is spread all over the backfill soil layer;

[0027] S6. Laying of the eco-bag slope protection system: Fill the eco-bags with plant growth substrates and plant seeds, and stack the eco-bags from bottom to top on the slope of the foundation pit to form an eco-bag slope protection system, and place the seeds in the eco-bags as close as possible to the exposed surface of the eco-bags on the slope.

[0028] Optionally, when the eco-bags are stacked, the eco-bags are placed horizontally and tilted 10°-15° toward the inside and outside of the slope.

[0029] By adopting the above technical solution, by tilting the eco-bags toward the inside and outside of the slope, it is convenient for the eco-bag slope protection system to drain water and quickly filter water, thereby reducing hydrostatic pressure.

[0030] Optionally, after the ecological bag slope protection system is laid, it needs to experience at least 10 minutes of moderate to heavy rain or water scouring, and no stagnant water can be seen after 60 minutes.

[0031] By adopting the above technical solution, the water permeability of the eco-bag slope protection system is tested through water flushing experiments, so as to avoid water accumulation at the location of the eco-bag slope protection system during the use of the ecological wetland body, which will affect people's travel.

[0032] Optionally, during the construction of the first geotextile layer and the second geotextile layer, the seam width of the geotextile is not less than 10 cm, and the seam of the geotextile is sewn by a portable sewing machine with two stitches.

[0033] By adopting the above technical solution, the structural strength of the first geotextile layer and the second geotextile layer is improved.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. Sewage enters the ecological wetland through the inlet channel, and some heavy floating objects carried in the water are initially precipitated through the solid floating object sedimentation area, and then the sewage is purified through the plant root purification area. The pollutants deposited in the ecological wetland are blocked by the riprap layer and the backfill soil layer, and the sewage that penetrates into the ground and is not completely purified is filtered through the backfill soil layer, the second geotextile layer, the sand and gravel layer, the crushed stone layer and the first geotextile layer in turn, thereby effectively preventing the pollutants deposited in the ecological wetland from infiltrating into the bottom and surrounding soil layers of the ecological wetland body, causing pollution to the bottom and surrounding soil layers of the ecological wetland body;

[0036] 2. The eco-bag slope protection system forms a layer of environment suitable for plant growth on the slope surface by stacking eco-bags filled with plant growth substrates along the slope surface. Because the slope surface growth environment created by the eco-bag slope protection system is good, herbaceous plants, small shrubs, and even some small trees can grow very well, forming a lush vegetation effect and achieving the purpose of soil and water conservation at the same time;

[0037] 3. When the inlet channel introduces sewage into the ecological wetland, the sewage first enters the maze channel, and the water flow speed is slowed down by the turns in the maze channel, which facilitates the sedimentation of solid floating objects in the sewage. Moreover, since the horizontal height of the lower wall of the outlet is higher than the bottom wall of the maze channel, the pollutants precipitated in the maze channel are not easy to enter the ecological wetland through the outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0039] Figure 2 yes Figure 1 A magnified view of part A;

[0040] Figure 3 It is a partial structural schematic diagram of an embodiment of the present application, and is mainly used to express the structural schematic diagram of the solid floating matter precipitation area;

[0041] Figure 4 It is a partial structural schematic diagram of an embodiment of the present application, mainly used to express the structural schematic diagram of the drainage gate chamber.

[0042] Explanation of the reference numerals in the accompanying drawings: 1. Solid floating matter sedimentation area; 11. Maze channel; 111. Water outlet; 12. Water inlet channel; 2. Plant root purification area; 3. Drainage area; 31. Drainage chamber; 311. Water inlet; 312. Partition; 313. Screen; 314. Filter material; 32. Drainage channel; 4. Eco-bag slope protection system; 41. Connector; 5. Stone filling layer; 6. Filter layer; 61. First geotextile layer; 62. Gravel layer; 63. Sand and gravel layer; 64. Second geotextile layer; 7. Backfill soil layer; 8. Riprap layer. DETAILED DESCRIPTION

[0043] The following is combined with Figure 1-4 This application is described in further detail.

[0044] The present application embodiment discloses an artificial ecological wetland system. Figure 1 , 2, including an ecological wetland body, in which a solid floating matter sedimentation area 1, a plant root purification area 2 and a drainage area 3 are arranged; the plant root purification area 2 includes a swamp, an ecological island, an ecological sandbar, etc., and an ecological bag slope protection system 4 is also arranged on the slope of the ecological wetland body; a stone filling layer 5, a filter layer 6, a backfill soil layer 7 and a riprap layer 8 are sequentially laid in the ecological wetland body.

[0045] Reference Figure 2 The stone filling layer 5 is formed by paving, compacting and leveling a number of large stones; the filter layer 6 includes a first geotextile layer 61 laid on the stone filling layer 5, a crushed stone layer 62 laid on the first geotextile layer 61, a sand and gravel layer 63 laid on the crushed stone layer 62, and a second geotextile layer 64 laid on the sand and gravel layer 63. When the first geotextile layer 61 and the second geotextile layer 64 are constructed, the seam width of the joints of the geotextiles is not less than 10 cm, and the seams of the geotextiles are sewn by a portable sewing machine, with two stitches, and when the crushed stone layer 62 and the sand and gravel layer 63 are laid, the crushed stone layer 62 and the sand and gravel layer 63 need to be leveled respectively.

[0046] Reference Figure 2 A geogrid is laid on the second geotextile layer 64, a backfill soil layer 7 is laid on the geogrid, and a riprap layer 8 is laid on the backfill soil layer 7. The riprap layer 8 is mostly made of pebbles with rounded surfaces.

[0047] Reference Figure 2 The eco-bag slope protection system 4 includes a number of eco-bags stacked on the slope of the ecological wetland body. The eco-bags have a filtering function that is water-permeable but not soil-permeable. The eco-bags are filled with plant growth matrix and plant seeds. The eco-bag slope protection system 4 forms a layer of environment suitable for plant growth on the slope surface by stacking eco-bags filled with plant growth matrix layer by layer along the slope surface. Since the slope surface growth environment created by the eco-bag slope protection system 4 is good, herbaceous plants, small shrubs, and even some small trees can grow very well, forming a lush vegetation effect, and at the same time achieving the purpose of soil and water conservation.

[0048] The plant growth matrix includes soil and organic fertilizer. The soil is collected on site, and the debris, roots, branches, stones with a diameter of more than 50mm and other toxic substances need to be removed during the collection process, as well as calcium chloride, toxic substances, petroleum products, etc. The soil also needs to be screened during the collection process, so that the soil particles smaller than 50mm and larger than 2mm account for 60-70%, the particles larger than 0.05mm and smaller than 2mm account for 10-15%, and the clay accounts for 0-5%. After the soil is collected, organic fertilizer and plant seeds are mixed into the soil, and the organic fertilizer accounts for 10-15% in the eco-bag; the proportion of organic fertilizer and particles of different sizes in the eco-bag is strictly controlled, so that when the plant seeds in the eco-bag grow, the roots of the plants have sufficient oxygen absorption space and a better growth environment, thereby improving the growth state of the plants and the purification effect of the plants on the sewage in the ecological wetland.

[0049] Reference Figure 2 Before the ecological bags are laid, the slope needs to be compacted, and the foundation soil generally needs to be compacted to a density of 95%. When the ecological bags are laid, they are laid from low to high, layer by layer with staggered joints. The horizontal surface of the ecological bags is tilted 10°-15° toward the inside and outside of the slope. The ecological bags close to the slope of the ecological wetland body are fixed to the slope of the ecological wetland body by anchor bolts. A connector 41 is provided between two adjacent ecological bags. The connector 41 includes a three-dimensional drainage coupling buckle. The two adjacent ecological bags are fixed by the three-dimensional drainage coupling buckle. The ecological bags close to the slope of the ecological wetland body are fixed by anchor bolts, and the two adjacent ecological bags are fixed by the three-dimensional drainage coupling buckle, so as to achieve the purpose of firmly fixing the slope of the ecological wetland body, and the ecological bags are tilted toward the inside and outside of the slope, which is convenient for the ecological bag slope protection system 4 to drain water and quickly filter water, and reduce hydrostatic pressure.

[0050] Reference Figure 3 A labyrinth channel 11 is arranged in the solid floating sedimentation area 1. The labyrinth channel 11 is in an "S" shape and is made of reinforced concrete. One end of the labyrinth channel 11 is connected to an inlet channel 12, and the width of the labyrinth channel 11 is greater than the width of the inlet channel 12. An outlet 111 is provided at one end of the labyrinth channel 11 away from the inlet channel 12. The horizontal height of the lower side wall inside the labyrinth channel 11 gradually increases from the middle section of the labyrinth channel 11 to the outlet 111. When the inlet channel 12 introduces sewage into the ecological wetland body, the sewage first enters the labyrinth channel 11, and the water flow speed is slowed down by the turning in the labyrinth channel 11, so as to facilitate the sedimentation of solid floating objects in the sewage. Moreover, since the horizontal height of the lower mouth wall of the outlet 111 is higher than the bottom wall of the labyrinth channel 11, the pollutants precipitated in the labyrinth channel 11 are not easy to enter the ecological wetland body through the outlet 111, so as to facilitate the regular cleaning of the pollutants precipitated in the labyrinth channel 11.

[0051] Reference Figure 1 , 4A drainage gate chamber 31 is provided in the drainage area 3, and a water inlet 311 is provided on the side wall of the drainage gate chamber 31. The lower wall of the water inlet 311 is flush with the normal water level in the ecological wetland body. The drainage gate chamber 31 is connected to the drainage channel 32. A partition 312 is fixedly provided in the drainage gate chamber 31 and between the water inlet 311 and the drainage channel 32. A plurality of water holes are provided on the partition 312. The partition 312 is horizontally arranged. A partition net 313 is laid on the partition 312. A filter material 314 is laid on the partition net 313. The partition net 313 is used to block the filter material 314. In the present application, the filter material 314 is made of quartz sand. When the purified water in the ecological wetland body is discharged through the drainage channel 32, it first enters the drainage gate chamber 31 and is filtered by the filter material 314, thereby improving the purification effect of the ecological wetland body on sewage.

[0052] The implementation principle of an artificial ecological wetland system in an embodiment of the present application is as follows: sewage enters the maze channel 11 through the water inlet channel 12, the water flow speed is slowed down by the turns in the maze channel 11, and some heavy floating objects carried in the water are initially precipitated. Then, the sewage enters the ecological wetland body through the outlet 111 of the maze channel 11, and is purified by various plants in the purification system such as the swamp, ecological island, and ecological sandbar in the root purification area. The purified water enters the drainage gate chamber 31, is filtered through the filter material 314, and is then discharged through the drainage channel 32.

[0053] The pollutants deposited in the ecological wetland body are blocked by the riprap layer 8 and the backfill soil layer 7, and the sewage that penetrates into the ground and is not completely purified is filtered in turn by the backfill soil layer 7, the second geotextile layer 64, the sand and gravel layer 63, the crushed stone layer 62 and the first geotextile layer 61, thereby effectively preventing the pollutants deposited in the ecological wetland body from penetrating into the bottom of the ecological wetland body and the surrounding soil layers, causing pollution to the bottom of the ecological wetland body and the surrounding soil layers.

[0054] The present application also discloses a construction method of an artificial ecological wetland system, comprising the following steps:

[0055] S1. Excavation of foundation pit: dig a foundation pit at the construction location of the wetland ecosystem. The foundation pit is usually located at a lower terrain. After the foundation pit is excavated, the bottom of the foundation pit needs to be leveled and compacted;

[0056] S2, paving the stone filling layer 5, filling and throwing large stones into the foundation pit, so that the stones are spread all over the bottom of the foundation pit, and these stones are compacted and leveled by a gravity hammer to form a stone filling layer 5;

[0057] S3, paving the filter layer 6. On the basis of the stone filling layer 5, the first geotextile layer 61, the crushed stone layer 62, the sand and gravel layer 63 and the second geotextile layer 64 are laid in sequence to form the filter layer 6. During the construction, the joint width of the first geotextile layer 61 and the second geotextile layer 64 is not less than 10 cm, and the joint of the geotextile is sewn by a portable sewing machine, and two stitches are set. When laying the crushed stone layer 62 and the sand and gravel layer 63, the crushed stone layer 62 and the sand and gravel layer 63 need to be leveled respectively;

[0058] S4, laying the backfill soil layer 7, laying geogrids on the second geotextile layer 64, with the overlap width between the geogrids being not less than 50 cm, and pouring soil on the geogrids, compacting and leveling the soil to form the backfill soil layer 7;

[0059] S5, paving the riprap layer 8, after the backfill soil layer 7 is paved, pebbles are thrown on the backfill soil layer 7, and the stones are spread all over the backfill soil layer 7;

[0060] S6. Laying of the eco-bag slope protection system 4: Fill the eco-bags with plant growth substrates and plant seeds, and stack the eco-bags from bottom to top on the slope of the foundation pit to form the eco-bag slope protection system 4. Place the seeds in the eco-bags as close as possible to the exposed surface of the eco-bags on the slope. After the laying of the eco-bag slope protection system 4, it must experience at least 10 minutes of moderate to heavy rain or water scouring, and no stagnant water can be seen after 60 minutes.

[0061] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An artificial ecological wetland system, comprising an ecological wetland body, wherein an inlet channel (12) and a drainage channel (32) are arranged in the ecological wetland body, characterized in that: The ecological wetland body is provided with a solid floating matter sedimentation area (1), a plant root purification area (2) and a drainage area (3) in sequence from the water inlet channel (12) to the drainage channel (32), and the drainage channel (32) is connected to the drainage area (3); The ecological wetland body is sequentially provided with a rock filling layer (5), a filter layer (6), a backfill soil layer (7) and a riprap layer (8); the filter layer (6) comprises a first geotextile layer (61) laid on the rock filling layer (5), a crushed stone layer (62) laid on the first geotextile layer (61), a sand and gravel layer (63) laid on the crushed stone layer (62), and a second geotextile layer (64) laid on the sand and gravel layer (63); a geogrid is laid on the second geotextile layer (64); the backfill soil layer (7) is laid on the geogrid; and the riprap layer (8) is laid on the backfill soil layer (7); It also includes an eco-bag slope protection system (4) laid on the side slope of the ecological wetland body, the eco-bag slope protection system (4) includes a plurality of eco-bags, and the eco-bags are filled with plant growth matrix and plant seeds; A labyrinth channel (11) is provided in the solid floating sedimentation area (1), the water inlet channel (12) is connected to the labyrinth channel (11), a water outlet (111) is provided on the labyrinth channel (11), and the lower wall of the water outlet (111) is higher than the bottom wall of the labyrinth channel (11); A drainage sluice chamber (31) is provided in the drainage area (3), a water inlet (311) is provided in the drainage sluice chamber (31), the drainage channel (32) is connected to the drainage sluice chamber (31), and the interior of the drainage sluice chamber (31) is filled with filter material (314).

2. The artificial ecological wetland system according to claim 1, characterized in that: The eco-bags close to the side slope of the ecological wetland body are fixed on the side slope of the ecological wetland body by anchor bolts, and a connecting piece (41) is arranged between two adjacent eco-bags, and the connecting piece (41) is used to fix the two adjacent eco-bags.

3. The artificial ecological wetland system according to claim 1, characterized in that: The plant growth matrix includes soil and organic fertilizer. In the eco-bag, organic fertilizer accounts for 10-15%, soil particles smaller than 50 mm and larger than 2 mm account for 60-70%, particles larger than 0.05 mm and smaller than 2 mm account for 10-15%, and clay accounts for 0-5%.

4. The construction method of an artificial ecological wetland system according to claim 1, characterized in that: The following steps are involved: S1. Excavation of foundation pit: dig a foundation pit at the construction location of the wetland ecosystem. The foundation pit should be located at a lower terrain. After the excavation of the foundation pit is completed, the bottom of the foundation pit needs to be leveled and compacted; S2, paving the stone filling layer (5), filling the foundation pit with large stones so that the stones are spread all over the bottom of the foundation pit, and compacting and leveling the stones by a gravity hammer to form a stone filling layer (5); S3, laying the filter layer (6), laying a first geotextile layer (61), a crushed stone layer (62), a sand and gravel layer (63) and a second geotextile layer (64) in sequence on the basis of the stone filling layer (5) to form the filter layer (6), and when laying the crushed stone layer (62) and the sand and gravel layer (63), the crushed stone layer (62) and the sand and gravel layer (63) need to be leveled respectively; S4, laying the backfill soil layer (7), laying a geogrid on the second geotextile layer (64), pouring soil on the geogrid, and compacting and leveling the soil to form a backfill soil layer (7); S5, paving the riprap layer (8), after the backfill soil layer (7) is paved, throwing stones on the backfill soil layer (7) and making the stones spread all over the backfill soil layer (7); S6. Laying of the eco-bag slope protection system (4): Filling the eco-bags with plant growth substrates and plant seeds, and stacking the eco-bags in sequence from bottom to top on the slope of the foundation pit to form the eco-bag slope protection system (4), and placing the seeds in the eco-bags as close as possible to the exposed surface of the eco-bags on the slope.

5. The construction method of an artificial ecological wetland system according to claim 4, characterized in that: After the ecological bag slope protection system (4) is laid, it needs to experience at least 10 minutes of moderate to heavy rain or water scouring, and no standing water can be seen after 60 minutes.

6. The construction method of an artificial ecological wetland system according to claim 4, characterized in that: During the construction of the first geotextile layer (61) and the second geotextile layer (64), the seam width of the geotextile seams is not less than 10 cm, and the seams of the geotextiles are sewn by a portable sewing machine, with two stitches.

Images