High-gradient narrow channel erosion gully treatment structure and treatment method

Abstract

The invention discloses a high-gradient narrow channel erosion gully treatment structure and treatment method, and belongs to the technical field of erosion gully treatment. The erosion gully treatment structure comprises a fiber-reinforced flexible composite coiled material and an ecological step, the fiber-reinforced flexible composite coiled material is attached to the abrupt slope section of the gully and is perpendicular to the gully bottom, the upper end of the fiber-reinforced flexible composite coiled material is fixedly connected with the gully head, the lap joint gradient of the downstream section of the fiber-reinforced flexible composite coiled material is 1: 3-1: 4, and the lap joint width is 0.3-0.5 m. The fiber-reinforced flexible composite coiled material comprises an anti-impact wear-resistant layer, a reinforced layer and an inverted filter impermeable layer, the ecological step is arranged between the gentle slope section and the outlet section of the ditch bottom and is formed by piling up a plurality of composite ecological bags and woven bags I, the woven bags I are piled up in the ecological step, and the composite ecological bags are piled up on the outer surface of the ecological step. According to the method, large machines are not needed, extra land is not occupied, the engineering amount is small, the erosion problem of the composite erosion gully can be synchronously solved, stability, convenience and ecological coordination are considered, the method is suitable for treatment of different types of high-fall erosion gully, and the universality is high.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydraulic engineering, specifically, to the field of erosion ditch treatment, and relates to an erosion ditch treatment structure and method for a high-slope narrow ditch. BACKGROUND

[0002] Erosion ditches are a typical form of water and soil loss, and their formation and development can have multiple destructive effects on agricultural production, ecological environment and regional economy. Specifically, the continuous source erosion, downcutting erosion and lateral expansion of erosion ditches can directly lead to the thinning of cultivated soil layers, the decline of soil fertility, the barrenness and sandification of land, and the loss of agricultural productivity of land originally suitable for cultivation. At the same time, water and soil loss can also destroy regional ecological balance, reduce vegetation coverage and biodiversity, exacerbate ecological environment deterioration, and trigger disasters such as sandstorms and mudslides.

[0003] At present, existing erosion ditch treatment measures mainly include excavating intercepting ditches, horizontal grooves, fish-scale pits, etc., and planting trees such as pines in fish-scale pits and shrubs such as shrubs in ditch junctions, to alleviate water and soil loss through the synergistic effect of engineering interception and vegetation soil fixation. However, in erosion ditches with large drop and steep slope, the working surface is limited, the selection of construction machinery is limited, and the drop requirement is high. If traditional treatment measures are used, it is difficult to achieve good treatment effect.

[0004] After searching, the patent with the patent publication number CN109287225B, the publication date of October 30, 2020, and the name of a method for treating soil erosion ditches by planting trees on the ditch slope and assisting water conservation engineering was found. The patent document sets up a check dam in the ditch of a fish-scale pit to ensure that the vertical slope of the erosion ditch does not collapse, and then plants shrubs or trees in the ditch. The patent realizes energy dissipation by building check dams and supporting energy dissipation pools and apron sections. This is a point-type and rigid energy dissipation method with complex structure and large land occupation. For erosion ditches with high slope (> 60°) and narrow working surface (< 1m), large machinery cannot enter the site, and the construction difficulty and cost are high.

[0005] Therefore, for erosion ditches with high slope and narrow working surface where source, downcutting and expansion phenomena exist simultaneously, it is difficult to achieve treatment using existing technology. Therefore, it is urgent to design a treatment method that can increase the stability of the gully, facilitate construction and coordinate with the surrounding ecological environment, and completely improve the status of water and soil loss. SUMMARY

[0006] The present application aims to overcome the deficiencies of the prior art, and provides a high-gradient narrow-gully erosion gully treatment structure and treatment method, so as to solve the technical problems that the prior art cannot enter the site with construction machinery, has large engineering quantity, high land occupation rate, and cannot simultaneously solve the problems of headward erosion, downward erosion and lateral expansion combined erosion, and cannot balance engineering stability, construction convenience and ecological coordination in a gully with a slope > 60°, a slope width < 1 m, a drop > 3 m and a gully depth > 1 m.

[0007] In order to solve the above problems, the technical scheme adopted by the present application is as follows: The present application provides a high-gradient narrow-gully erosion gully treatment structure in a first aspect, which comprises a fiber-reinforced flexible composite roll and an ecological step. The fiber-reinforced flexible composite roll is attached to the steep slope section of the gully and drops into the gully bottom. The upper end of the fiber-reinforced flexible composite roll is fixedly connected to the gully head. The downstream section of the fiber-reinforced flexible composite roll overlaps the ecological step. The overlapping width of the fiber-reinforced flexible composite roll and the ecological step is 0.3-0.5 m. The fiber-reinforced flexible composite roll comprises an impact-resistant wear-resistant layer, a reinforced layer and a anti-filtration and anti-seepage layer. The main materials of the impact-resistant wear-resistant layer are high-performance fibers and high-grade cement. The reinforced layer mainly comprises integrated high-strength net-shaped fibers. The anti-filtration and anti-seepage layer is an anti-filtration geotextile.

[0008] The ecological step is arranged between the gentle slope section and the outlet section of the gully bottom, and the gradient of the ecological step is 1:3-1:4. The ecological step is formed by stacking a plurality of composite ecological bags and woven bags. The inside of the ecological step is stacked with woven bags, and the outer surface of the ecological step is stacked with composite ecological bags. Each composite ecological bag contains soil, slow-release fertilizer, water-retaining agent and grass and shrub plant seeds suitable for local environment growth.

[0009] As a possible implementation of the first aspect of the present application, the width of the single-piece fiber-reinforced flexible composite roll is greater than the width of the slope surface of the erosion gully. When two adjacent fiber-reinforced flexible composite rolls are overlapped, the end of the fiber-reinforced flexible composite roll located upstream is covered on the surface of the fiber-reinforced flexible composite roll located downstream, and the overlapping length of the two fiber-reinforced flexible composite rolls is not less than 0.2 m.

[0010] As a possible implementation of the first aspect of the present application, the fiber-reinforced flexible composite roll is fixed on the steep slope section of the gully by an array of U-shaped nails. The spacing between two adjacent U-shaped nails is 0.5-0.7 m.

[0011] As a possible implementation of the first aspect of the present application, the thickness of the fiber-reinforced flexible composite roll is greater than 2 cm, the compressive strength thereof is ≥ 40 MPa, the tensile ultimate strength thereof is ≥ 4 MPa, and the impact strength of the core material thereof is ≥ 6 kJ / m².

[0012] As a possible implementation of the first aspect of the application, the ecological steps are composed of ridge structures arranged every 1.5-2.5 m along the gentle slope section to the gully bottom line, each ridge structure is stacked by the woven bag one and the composite ecological bag, and the middle part of each ridge structure is reserved with an overflow port.

[0013] As a possible implementation of the first aspect of the application, the woven bag one is filled with soil; the composite ecological bag comprises a woven bag two with a degradable film sleeved on the outer surface, and a cavity formed between the degradable film and the surface of the woven bag two is filled with slow-release fertilizer, water-retaining agent and grass and shrub plant seeds suitable for growth in the local environment.

[0014] As a possible implementation of the first aspect of the application, after the adjacent two woven bags one or the adjacent two composite ecological bags or the adjacent one woven bag one and one composite ecological bag are stacked, a connecting buckle is used for connection.

[0015] As a possible implementation of the first aspect of the application, the erosion gully slope width is <1 m, the gully bottom slope is >60°, and the drop is >3 m.

[0016] The second aspect of the application provides a high-slope narrow-gully erosion gully treatment method, comprising the following steps: Step one, prefabricating a fiber-reinforced flexible composite coiled material, a composite ecological bag and a woven bag one; Step two, erosion gully modification; Step three, laying and fixing the fiber-reinforced flexible composite coiled material; Step four, overlapping the ecological steps on the downstream fiber-reinforced flexible composite coiled material.

[0017] As a possible implementation of the second aspect of the application, in step two, first, all weeds, stones and other sharp objects that may affect the laying in the construction area are removed, in the steep slope section, the original gully surface slope is basically reserved, and the local uplift or concave place is slightly modified or filled, in the gentle slope section, the gully body is shaped as an inverted trapezoid, the gully side wall slope is modified to 1:3, and the gully bottom slope is modified to 1:3-1:4; In step three, before laying the fiber-reinforced flexible composite coiled material, the soil in the trench bottom is first watered to moisten, a joint groove is excavated on the trench head, the fiber-reinforced flexible composite coiled material is buried, and a U-shaped nail is used for fixation; the fiber-reinforced flexible composite coiled material is laid from the slope top to the slope foot, and the overlap width of two pieces of fiber-reinforced flexible composite coiled material is greater than or equal to 20 cm; after laying is completed, watering and maintenance are carried out, the watering amount per square meter is not less than 9 kg, the water is evenly sprayed from the edge to the middle to ensure that the fiber-reinforced flexible composite coiled material is poured through, after the watering is completed, maintenance is carried out, and it is prohibited to step on; when the average temperature of day and night is higher than 30 DEG C, the surface should be covered with plastic film or geotextile to keep moist, and the watering and maintenance time should be not less than 3 days; In step four, the ecological steps are arranged starting from 0.3-0.5 m from the bottom of the fiber-reinforced flexible composite coiled material, the floating soil in the trench bottom is cleaned, the woven bag I and the composite ecological bag are laid horizontally and closely from the base, the laying surface is kept flat, and the adjacent two woven bags I or the adjacent two composite ecological bags or the adjacent one woven bag I and one composite ecological bag are connected by using a connecting buckle to form multiple water weir structures distributed at intervals.

[0018] Compared with the prior art, the beneficial effects of the present application are: (1) The high-slope narrow-gully erosion ditch treatment structure provided by the present application solves the problems of trace source erosion, undercutting erosion and lateral expansion of the high-fall narrow-gully ditch in one time through the cooperative design of the fiber-reinforced flexible composite coiled material and the ecological steps, on the one hand, the fiber-reinforced flexible composite coiled material is used for slope protection to avoid disorderly erosion of the slope and effectively prevent lateral expansion of the erosion ditch, and on the other hand, the ecological steps are designed to gradually eliminate the potential energy of the high-fall water flow through 1:3 slope connection, 2 m interval water weirs and overflow ports, effectively prevent undercutting erosion, and form a silt deposition field to block the trace source extension of the ditch, the design maximally utilizes the existing terrain, reduces the amount of slope cutting, omits the energy dissipation pool and apron section compared with the traditional drop structure, reduces the land occupation rate, and greatly reduces the engineering quantity.

[0019] (2) The high-slope narrow-gully erosion ditch treatment structure provided by the present application is designed through the specific structure of the fiber-reinforced flexible composite coiled material, which comprises an impact-resistant and wear-resistant layer, a reinforced layer and a filter anti-seepage layer, so that it has excellent impact resistance and wear resistance, can effectively protect the slope surface, reduce the erosion of rainwater on the slope, and at the same time, the side of the fiber-reinforced flexible composite coiled material adhered to the slope surface is a filter anti-seepage layer, which effectively prevents soil particles from flowing away and avoids damage to the ditch bed foundation, greatly reducing the later operation and maintenance investment.

[0020] (3) The high-slope narrow-gully erosion gully treatment structure of the present application uses woven bags 1 and composite ecological bags to form spaced water weir structures, each water weir structure has a reserved overflow port, which can effectively dissipate the energy of incoming water and reduce the further erosion of the gully bottom by the water flow.

[0021] (4) The high-slope narrow-gully erosion gully treatment structure of the present application, the composite ecological bag comprises a woven bag 2 filled with soil, a degradable film is arranged on the outer layer of the woven bag 2, and the space formed between the woven bag 2 and the degradable film is filled with slow-release fertilizer, water-retaining agent and grass and shrub plant seeds suitable for local environmental growth. After a period of time, the degradable film degrades, the seeds in the composite ecological bag germinate and grow, the plant root systems extend into the soil in the woven bag 2 to form a natural soil fixation system, realizing the long-term combination of engineering stability and ecological restoration, continuously improving the stability of the gully after treatment, avoiding the defects of traditional structures that are easily damaged and need to be repaired repeatedly, and can be adapted to different regions and different types of high-fall erosion gully treatment, and has strong universality.

[0022] (5) The high-slope narrow-gully erosion gully treatment method of the present application uses fiber-reinforced flexible composite coiled material and ecological steps to realize the treatment of high-slope narrow-gully erosion gully. On the one hand, the fiber-reinforced flexible composite coiled material and the composite bag material have low cost and convenient transportation, and the cost of concrete pouring and large-scale mechanical leasing of the energy dissipation pool and the apron section is omitted. On the other hand, the existing terrain is utilized to the maximum extent, and the surrounding soil and vegetation are disturbed to the minimum extent. In addition, the treatment structure of the present application has strong anti-erosion and anti-sliding performance, and the vegetation after ecological restoration can independently stabilize the gully, and frequent maintenance is not required.

[0023] (6) The high-slope narrow-gully erosion gully treatment method of the present application directly lays the fiber-reinforced flexible composite coiled material and fixes it by using U-shaped nails, and directly stacks woven bags 1 and composite ecological bags to form the ecological steps of the water weir structure, which is convenient to construct and does not require the use of large machinery, and has low treatment cost. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structural schematic view of the high-slope narrow-gully erosion gully treatment structure of the present application. Figure 2 It is a top view structural schematic view of the high-slope narrow-gully erosion gully treatment structure of the present application. Figure 3 It is a sectional view structural schematic view of the water weir structure in the ecological step of the present application. Figure 4 It is a structural schematic view of the fiber-reinforced flexible composite coiled material of the present application. Figure 5 It is a structural schematic view of the composite ecological bag of the present application.

[0025] In the picture: 1. Fiber-reinforced flexible composite roll material; 11. Impact-resistant and abrasion-resistant layer; 12. Reinforcing and strengthening layer; 13. Reverse filter and seepage-proof layer; 2. Ecological steps; 21. Water embankment structure; 22. Overflow outlet; 23. Woven bag; 3. Ditch head; 31. Backfill soil; 32. Water-retaining embankment; 4. Steep slope section; 41. U-shaped nails; 5. Gentle slope section; 51. Exit section; 52. Ditch bottom line; 6. Composite ecological bags; 61. Degradable films; 62. Seeds and fertilizers; 63. Woven bags (II). Detailed Implementation

[0026] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] Existing gully control technologies are mainly designed for conventional scenarios with gentle slopes and wide gullies. However, in agricultural production, there are numerous high-drop, narrow-channel gullies with slope widths <1m, bottom slopes >60°, drops >3m, and depths >1m. Controlling these gullies faces multiple technical challenges: First, the large drop in channel height results in extremely high water flow potential energy, requiring simultaneous resistance to headward, downcutting, and lateral erosion. Traditional single-structure methods (such as intercepting ditches and fish-scale pits) cannot provide systematic protection. Second, the narrow gully surface (<1m) restricts the access of large construction machinery, limiting the operating space for small machinery. Traditional rigid drop structures (including energy dissipation pools and seawall sections) require extensive slope cutting and land occupation, resulting in massive engineering work and low construction efficiency. Furthermore, traditional engineering structures have poor ecological compatibility, while single ecological measures lack sufficient erosion resistance, making it difficult to find a balance between engineering stability and ecological restoration. Therefore, for this special working condition of erosion gullies with high drops and narrow channels, the technical solution provided in this embodiment does not require large machinery, does not occupy additional land, has a small amount of engineering work, and can solve complex erosion problems at the same time, while taking into account stability, convenience and ecological harmony. The following will be described in detail with reference to specific embodiments.

[0028] Example 1 like Figure 1 and Figure 2 As shown in this embodiment, a high-slope, narrow-channel erosion gully treatment structure is proposed, comprising fiber-reinforced flexible composite roll 1 and ecological steps 2. It should be noted that the erosion gully mentioned in this embodiment differs significantly from traditional erosion gullies. The erosion gully treated in this embodiment has the following characteristics: slope width <1m, gully bottom slope >60°, drop >3m, and simultaneous occurrence of headward erosion, downcutting erosion, and lateral expansion. This type of erosion gully has a large drop, steep slope, fast water flow velocity, and strong impact force, requiring extremely high stability and erosion resistance from the drop structure. Traditional intercepting ditches and horizontal channels are insufficient in erosion resistance, unable to withstand the scouring of high-speed water flow, easily leading to structural damage and failing to effectively curb downcutting and headward erosion. Furthermore, the narrow gully surface restricts the operation of traditional construction machinery; large construction machinery is difficult to access, and the selection of small machinery is limited by the available space, resulting in low construction efficiency and difficulty in ensuring construction quality. This embodiment combines fiber-reinforced flexible composite roll 1 with ecological steps 2 to increase gully stability, adapt to narrow and steep working environments, facilitate construction, and harmonize with the surrounding ecological environment. It fundamentally blocks the expansion path of gullies, achieves thorough improvement of soil and water loss, and effectively solves the problem of gully management in such complex working conditions.

[0029] Specifically, the fiber-reinforced flexible composite roll 1 is attached to the steep slope section 4 of the gully and extends down to the bottom of the gully. It is mainly used for the protection of erosion gullies with small catchment areas and steep banks. The upper end of the fiber-reinforced flexible composite roll 1 is fixedly connected to the gully head 3. To ensure the fixing effect of the upper end of the fiber-reinforced flexible composite roll 1, in this embodiment, a bonding groove is excavated on the gully head 3, the upper end of the fiber-reinforced flexible composite roll 1 is buried in the bonding groove, fixed with U-shaped nails, and compacted and backfilled with backfill soil 31. In addition, in order to further reduce the impact of incoming water on the erosion gully, a water-blocking embankment 32 can also be set at the tail of the gully head 3, in front of the entrance of the steep slope section 4.

[0030] After laying the fiber-reinforced flexible composite roll 1, U-shaped nails are used to fix the fiber-reinforced flexible composite roll 1 to the entrance of the ditch head 3, steep slope section 4, and gentle slope section 5. To improve the fixing effect, the U-shaped nails are distributed in an array, with the spacing between two adjacent U-shaped nails specifically set at 0.5m. The U-shaped nails are... 8mm rebar, 500mm long and 150mm wide on one side. (Example:) Figure 4 As shown, the fiber-reinforced flexible composite roll 1 used in this embodiment includes, from top to bottom, an impact-resistant and abrasion-resistant layer 11, a reinforcing layer 12, and a filter and seepage-proof layer 13. The impact-resistant and abrasion-resistant layer 11 is made of high-performance fibers and high-grade cement. The reinforcing layer 12 is mainly composed of integrated high-strength mesh fibers. The filter and seepage-proof layer 13 is a filter geotextile. By designing the structure of the fiber-reinforced flexible composite roll 1, its surface has abrasion-resistant and impact-resistant properties. The reinforcing layer 12 in the middle uses high-strength mesh fibers to provide strength, and its bottom surface is provided with filter geotextile, which provides excellent seepage resistance. Therefore, after laying, it can provide excellent protection for the steep slope section 4 of the erosion gully. The fiber-reinforced flexible composite roll 1 of the present invention, after testing, has a thickness greater than 2cm, a compressive strength ≥40MPa, a tensile ultimate strength ≥4MPa, and a core material impact strength ≥6kJ / m². The advantage of this design is that it ensures the strength of the roll material, improves its durability, and effectively guarantees the quality of subsequent construction. If the parameters are lower than those mentioned above, the roll material is prone to damage during construction.

[0031] Furthermore, and more importantly, the fiber-reinforced flexible composite roll 1 of this embodiment can be prefabricated in the factory and directly transported to the construction site for use. The laying operation is convenient and does not require large equipment to be brought to the site, making it particularly suitable for the specific erosion ditch treatment of this invention.

[0032] As a further improvement to this embodiment, the width of the fiber-reinforced flexible composite roll 1 is greater than the width of the erosion ditch slope. When two adjacent fiber-reinforced flexible composite rolls 1 overlap, the end of the upstream fiber-reinforced flexible composite roll 1 covers the surface of the downstream fiber-reinforced flexible composite roll 1, and the overlap length of the two fiber-reinforced flexible composite rolls 1 is 0.2m. This design ensures the integrity and impermeability of all fiber-reinforced flexible composite rolls 1 after connection.

[0033] Meanwhile, an ecological step 2 is overlapped on the fiber-reinforced flexible composite roll 1 in the downstream section. The overlap width between the fiber-reinforced flexible composite roll 1 and the ecological step 2 is not less than 0.3m. The overlap width is the length of the overlapping part of the fiber-reinforced flexible composite roll 1 and the ecological step 2. In this embodiment, the specific overlap width is 0.3m. The advantage of this design is that it effectively ensures the integrity and seepage prevention capability of the connection between the roll and the ecological step 2.

[0034] like Figure 1 and Figure 2 As shown, the ecological steps 2 are located on the gentle slope section 5 at the bottom of the ditch, extending all the way to the bottom line 52 of the ditch, and the slope of the ecological steps 2 is no greater than 1:3. The advantage of this design is that it effectively ensures the stability of the ecological steps 2.

[0035] like Figure 3 As shown, the ecological step 2 is formed by stacking multiple composite ecological bags 6 and woven bags 23. The interior of the ecological step 2 is stacked with woven bags 23, and the outer surface of the ecological step 2 is stacked with composite ecological bags 6. Each composite ecological bag 6 contains soil, slow-release fertilizer, water-retaining agent, and grass and shrub seeds suitable for local growth. Due to the insufficient compatibility between the engineering structure and biological vegetation in traditional management measures, simply planting trees or shrubs in steep and narrow ditches results in low survival rates, insufficient soil-fixing capacity, and potential damage to the original ecosystem without considering the coordination between the engineering structure and the surrounding ecological environment. The composite ecological bag 6 designed in this embodiment has the following structural design: Figure 5As shown, the composite ecological bag 6 has the same overall size as the woven bag 23 piled in the center of the ecological step 2. The difference between the composite ecological bag 6 and the woven bag 23 is that a woven bag 63 is also placed in the center of the composite ecological bag 6. The size of the woven bag 63 is smaller than that of the woven bag 23 piled in the center of the ecological step 2. This is because the surface of the woven bag 63 in the composite ecological bag 6 is covered with a degradable film 61. The cavity formed by the degradable film 61 and the surface of the woven bag 63 is filled with slow-release fertilizer, water-retaining agent and grass and shrub seeds suitable for local growth, i.e., seeds and fertilizer 62. Through this design, while enhancing the overall stability of the gully, the seeds in the composite ecological bag 6 can germinate over time with the presence of fertilizer and water-retaining agent, improving the survival rate of vegetation. Moreover, the seeds placed in the composite ecological bag 6 are adapted to the local ecological environment. Before the degradable film 61 degrades, the plant roots have already penetrated into the soil in the woven bag 63 and formed a natural soil stabilization system, realizing a long-term combination of engineering stability and ecological restoration, which is conducive to the continuous improvement of the stability of the gully after treatment.

[0036] Combination Figures 1-3 As shown, the ecological steps 2 are composed of water embankment structures 21 set at 2m intervals along the length of the gentle slope section 5. Each water embankment structure 21 is formed by stacking composite ecological bags 6 and woven bags 23. All composite ecological bags 6 and woven bags 23 are connected by connecting buckles. The water embankment structure 21 formed by stacking is also reserved with an overflow outlet 22 in the middle, which can effectively dissipate the energy of the incoming water and reduce the further scouring of the bottom of the ditch by the incoming water flow.

[0037] Specifically, the outer surface of each water embankment structure 21 is piled with composite ecological bags 6, and the inside of each bag is piled with woven bags 23 containing only local soil. This design is conducive to the growth of local vegetation on each water embankment structure 21.

[0038] Furthermore, this embodiment also provides a method for treating erosion gullies with high slopes and narrow channels, which uses the treatment structure of the present invention for protection, and specifically includes the following steps: Step 1: Prefabricate fiber-reinforced flexible composite roll 1, composite eco-bag 6, and woven bag 23; Step 2: Repairing erosion gullies; First, remove all weeds, stones, and other sharp objects from the construction area that may affect the laying. On steep slopes, largely retain the original trench slope, making minor adjustments or filling in any raised or sunken areas to ensure smooth laying of the roll material later. On gentle slopes, shape the trench into an inverted trapezoid, adjusting the sidewall slope to 1:3 and the bottom slope to 1:3-1:4.

[0039] Step 3: Lay and fix fiber-reinforced flexible composite roll 1; Before laying the fiber-reinforced flexible composite roll 1, first moisten the soil at the bottom of the trench with water. Excavate a bonding trench 1 meter above the top of the trench, bury the fiber-reinforced flexible composite roll 1, and secure it with U-shaped nails 41. Lay it from the top of the slope towards the bottom, following the principle of "upper width over lower width" (i.e., in the direction of water flow) on the slope surface. The overlap width of two pieces of fiber-reinforced flexible composite roll 1 should be ≥20cm. Secure the edges of the material with U-shaped nails 41 along the trench edge and fix the overlapping areas with rivets. After fixing, cover the edges of the fiber-reinforced flexible composite roll 1 with soil. Then, water it, using no less than 9kg of water per square meter, evenly sprinkling from the edges to the center, ensuring the fiber-reinforced flexible composite roll 1 is completely saturated until its color darkens. After watering, perform curing; avoid stepping on it. When the temperature is ≤5℃, take insulation measures; when the average day and night temperature is above 30℃, cover the surface with plastic film or geotextile to maintain moisture. Watering and maintenance should take no less than 3 days.

[0040] Step 4: Overlay the ecological step 2 onto the downstream fiber-reinforced flexible composite roll 1.

[0041] Ecological steps 2 are set up starting 300mm from the bottom of fiber-reinforced flexible composite roll 1. Loose soil is cleared from the bottom of the ditch, and the woven bags 23 are manually filled with nearby soil, laid tightly horizontally, ensuring a smooth surface. Two woven bags 23 are connected with buckles, with a total of 6 layers laid, reaching a total height of 0.7m. Woven bags 23 are laid inside ecological steps 2, while composite ecological bags 6 are laid on the outer surface. After a period of time, the biodegradable film 61 degrades, and the seeds in the composite ecological bags 6 germinate and grow. Plant roots extend into the soil of woven bags 23 and woven bags 23, forming a natural soil-stabilizing system. This achieves a long-term combination of engineering stability and ecological restoration, continuously improving the stability of the ditch after treatment. It avoids the defects of traditional structures that are easily damaged and require repeated maintenance, and can be adapted to the treatment of high-drop erosion ditches in different regions and of different types, demonstrating strong versatility.

[0042] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A structure for controlling erosion gullies with steep slopes and narrow channels, characterized in that: The system includes a fiber-reinforced flexible composite roll (1) and an ecological step (2). The fiber-reinforced flexible composite roll (1) is attached to the steep slope section (4) of the ditch and hangs down to the bottom of the ditch. The upper end of the fiber-reinforced flexible composite roll (1) is fixedly connected to the head of the ditch (3). The downstream section of the fiber-reinforced flexible composite roll (1) overlaps with the ecological step (2). The overlap width between the fiber-reinforced flexible composite roll (1) and the ecological step (2) is 0.3-0.5m. The fiber-reinforced flexible composite roll (1) includes an impact-resistant and abrasion-resistant layer (11), a reinforcing and strengthening layer (12), and a filter and seepage-proof layer (13). The ecological steps (2) are located between the gentle slope section (5) at the bottom of the ditch and the outlet section (51), and the slope of the ecological steps (2) is 1:3-1:

4. The ecological step (2) is formed by stacking multiple composite ecological bags (6) and woven bags (23). The interior of the ecological step (2) is stacked with woven bags (23), and the outer surface of the ecological step (2) is stacked with composite ecological bags (6). Each composite ecological bag (6) contains soil, slow-release fertilizer, water-retaining agent and grass and shrub seeds suitable for local growth.

2. The gully erosion control structure for high-slope narrow channels according to claim 1, characterized in that, The width of a single fiber-reinforced flexible composite roll (1) is greater than the width of the erosion ditch slope. When two adjacent fiber-reinforced flexible composite rolls (1) overlap, the end of the upstream fiber-reinforced flexible composite roll (1) covers the surface of the downstream fiber-reinforced flexible composite roll (1), and the overlap length of the two fiber-reinforced flexible composite rolls (1) is not less than 0.2m.

3. The gully erosion control structure for high-slope narrow channels according to claim 1, characterized in that, The fiber-reinforced flexible composite roll (1) is fixed on the steep slope section (4) of the ditch using an array of U-shaped nails (41), with the spacing between two adjacent U-shaped nails (41) set to 0.5~0.7m.

4. The gully erosion control structure for high-slope narrow channels according to claim 1, characterized in that, The fiber-reinforced flexible composite roll (1) has a thickness greater than 2cm, a compressive strength ≥40MPa, a tensile strength ≥4MPa, and a core material impact strength ≥6kJ / m².

5. The gully erosion control structure for high-slope narrow channels according to claim 1, characterized in that, The ecological steps (2) are composed of water embankment structures (21) set at intervals of 1.5-2.5m along the gentle slope section (5) towards the bottom line of the ditch (52). Each water embankment structure (21) is made up of woven bags (23) and composite ecological bags (6), and an overflow outlet (22) is reserved in the middle of each water embankment structure (21).

6. The gully erosion control structure for high-slope narrow channels according to claim 5, characterized in that, The woven bag one (23) is filled with soil; the composite ecological bag (6) includes a woven bag two (63) with a degradable film (61) on its outer surface, and the cavity formed by the degradable film (61) and the surface of the woven bag two (63) is filled with slow-release fertilizer, water-retaining agent and grass and shrub seeds suitable for local growth.

7. The gully erosion control structure for high-slope narrow channels according to any one of claims 1-6, characterized in that, After two adjacent woven bags (23), two adjacent composite ecological bags (6), or one adjacent woven bag (23) and one composite ecological bag (6) are stacked, they are all connected by fasteners.

8. The gully erosion control structure for high-slope narrow channels according to any one of claims 1-6, characterized in that, The erosion gully has a slope width of <1m, a bottom slope of >60°, and a drop of >3m.

9. A method for controlling erosion gullies in narrow, high-slope channels, characterized in that, The protection provided by adopting the governance structure as described in any one of claims 1-8 specifically includes the following steps: Step 1: Prefabricated fiber-reinforced flexible composite roll (1), composite ecological bag (6) and woven bag 1 (23); Step 2: Repairing erosion gullies; Step 3: Lay and fix fiber-reinforced flexible composite roll (1); Step 4: Overlay an ecological step (2) onto the downstream fiber-reinforced flexible composite roll (1).

10. The method for treating erosion gullies with steep slopes and narrow channels according to claim 9, characterized in that: In step two, first remove all weeds, stones and other sharp objects that may affect the paving in the construction area. In the steep slope section (4), basically retain the original slope of the ditch surface, and make minor adjustments or fill in the local raised or sunken areas. In the gentle slope section, shape the ditch into an inverted trapezoid, adjust the slope of the ditch side wall to 1:3, and adjust the slope of the ditch bottom to 1:3-1:

4. In step three, before laying the fiber-reinforced flexible composite roll (1), the soil at the bottom of the ditch is moistened by watering. A joint trench is dug at the head of the ditch (3), the fiber-reinforced flexible composite roll (1) is buried, and it is fixed with U-shaped nails (41). The fiber-reinforced flexible composite roll (1) is laid from the top of the slope to the foot of the slope, and the overlap width of two pieces of fiber-reinforced flexible composite roll (1) is ≥20cm. After the laying is completed, water is used for curing. The amount of water used per square meter is not less than 9kg. Water is sprayed evenly from the edge to the middle to ensure that the fiber-reinforced flexible composite roll (1) is thoroughly watered. After watering, curing is carried out. Stepping on the surface is prohibited. When the temperature is ≤5℃, heat preservation measures are taken. When the average temperature during the day and night is higher than 30℃, the surface is covered with plastic film or geotextile to keep it moist. In step four, ecological steps (2) are set up 0.3-0.5m away from the bottom of the fiber-reinforced flexible composite roll (1). The bottom of the trench is cleaned of loose soil and the woven bag (23) and the composite ecological bag (6) are laid horizontally and tightly. The laying surface is kept flat. Adjacent woven bags (23) or adjacent composite ecological bags (6) or adjacent woven bags (23) and composite ecological bags (6) are connected by connecting buckles to form multiple spaced water embankment structures (21).

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