A new cultivated land erosion ditch treatment structure and treatment method

Abstract

The application relates to the technical field of water and soil conservation, and provides a newly-added or restored cultivated land erosion ditch treatment structure and a treatment method, which comprise a landfill body, a cultivated soil layer and a buried pipe drainage system, the landfill body is arranged in an erosion ditch to be treated, at least part of the space of the erosion ditch is filled under the premise of ensuring the flood discharge safety of the ditch, the cultivated soil layer covers the top of the landfill body and constitutes a planting layer of the newly-added or restored cultivated land, the buried pipe drainage system is arranged below the cultivated soil layer and is embedded in the upper part of the landfill body, the outer side of the buried pipe drainage system is covered with a blockage prevention layer, and the blockage prevention layer is used for converting the surface runoff and soil water flowing into the cultivated soil layer into underground water flow and discharging the underground water flow. The application greatly reduces the direct scouring force of surface water on the newly-added cultivated soil layer, fundamentally prevents the occurrence of secondary erosion, and ensures the long-term stability and sustainable utilization of the cultivated land after treatment.

Description

Technical Field

[0001] This invention relates to the field of soil and water conservation technology, and in particular to a structure and method for treating newly added or restored erosion gullies in cultivated land. Background Technology

[0002] Gullies are a severe manifestation of soil erosion in the black soil region. There are a total of 666,700 gullies exceeding 50 meters in depth across the region, of which 494,800 are located in cultivated land, accounting for 74.2% of the total. Among cultivated land, 450,100 are developmental gullies, representing 90.97% of the total. Gullies directly damage approximately 4.2 million mu (667,000 hectares) of cultivated land, resulting in a loss of about 2.5 billion kilograms of grain, seriously threatening food security in the black soil region. They also lead to farmland fragmentation, restricting the passage and operation of agricultural machinery, significantly reducing agricultural productivity; exacerbate ecological degradation, and the loss of large amounts of fertile soil causes river siltation, weakening river flood control capacity and reducing natural disaster prevention capabilities. Gullies cause enormous damage to agricultural production and the ecological environment. The state has included the management of gullies in the Northeast black soil region in its efforts to strengthen cultivated land protection and quality improvement, highlighting the necessity and urgency of this issue.

[0003] Currently, the main technologies for controlling gully erosion in the Northeast black soil region are engineering and vegetation measures to control gully head infiltration, gully bottom erosion, and bank collapse, with the aim of controlling gully development. There is a lack of gully erosion control technologies specifically applicable to the creation and restoration of arable land. Traditional gully control techniques, such as straw burial and reclamation, willow stake / ecological bag / gabion revetment, and ecological brick slope protection, can achieve the goal of creating and restoring arable land, but they also have certain problems in application. Straw burial and reclamation uses baled straw as material to fill the gully, converting surface runoff into underground drainage pipes to control gullies. However, these underground pipes are prone to blockage over long periods of operation, and the restored arable land is highly susceptible to gully re-formation under the scouring action of runoff. Furthermore, this technology is suitable for gullies with gentle slopes and small catchment areas; it lacks suitability and effectiveness for large and medium-sized gullies. Willow stake / eco-bag / gabion / eco-brick revetment technology can effectively slow down water flow and stabilize ditch slopes. Simultaneously, while meeting flood control requirements, it can reduce the ditch cross-section, expand the area between the outer side of the ditch and the original farmland, and transform non-arable land into arable land that meets cultivation standards and is included in the farmland statistics system through land consolidation and soil improvement, restoring damaged farmland to arable status. However, all of these technologies require large amounts of backfill soil during implementation, and the newly added or restored farmland is highly susceptible to secondary erosion under water flow, making it difficult to sustain the effectiveness of the remediation measures. Summary of the Invention

[0004] This invention provides a structure and method for treating gully erosion in newly created or restored farmland. It addresses the problem that traditional gully erosion treatment techniques, when used to restore or create new farmland, often result in secondary erosion due to surface runoff, leading to unstable treatment effects and an inability to maintain farmland stability in the long term. This invention significantly reduces the direct scouring force of surface water on the newly created arable soil layer, fundamentally preventing secondary erosion and ensuring the long-term stability and sustainable use of the treated farmland.

[0005] This invention provides a structure for adding or restoring gully erosion control in cultivated land, comprising: A landfill body, wherein the landfill body is disposed within the erosion gully to be treated, for filling at least a portion of the space of the erosion gully; A topsoil layer, which covers the top of the landfill, forming a planting layer for newly added or restored arable land; and The underground drainage system is laid beneath the cultivated soil layer and buried above the landfill. The outside of the underground drainage system is covered with an anti-clogging layer, which is used to convert surface runoff and soil water flowing into the cultivated soil layer into groundwater and discharge it.

[0006] According to the present invention, a new or restored farmland erosion gully treatment structure further includes a slope protection unit, which is arranged along the preset flood discharge section of the erosion gully, and the fill body is set between the slope protection unit and the original erosion gully bank. And / or, the slope protection unit is selected from at least one of willow pile bank protection, eco-bag slope protection, gabion slope protection or eco-brick slope protection.

[0007] According to the present invention, a structure for treating erosion gullies in newly added or restored farmland is provided, wherein the underground drainage system includes a corrugated pipe and the anti-clogging layer is a non-woven fabric wrapped around the outside of the corrugated pipe.

[0008] According to the present invention, a new or restored gully erosion control structure for farmland is provided, wherein the fill material is completely filled into the gully to be controlled; And / or, the landfill material is composed of at least one of bundled and compacted straw, coal gangue, or soil selected from comprehensive utilization.

[0009] According to the present invention, a new or restored gully erosion control structure for farmland is provided. When the landfill material of the landfill body is straw, the straw is a bundled and compacted rectangular straw bale with a density greater than 230 kg / m³ and a weight of less than 50 kg per straw bale. The upper and lower layers of the underground drainage system are both covered with a layer of usable soil, and a non-woven fabric isolation layer is laid between the usable soil layer and the straw.

[0010] According to the present invention, a structure for treating erosion gullies in newly added or restored farmland further includes a compacted soil layer, which is backfilled on the back of the slope protection unit and compacted to form a basic support for the slope protection unit.

[0011] This invention also provides a method for treating newly added or restored gullies in cultivated land, comprising the following steps: S1: Under the premise of ensuring the safety of flood discharge in the gully, fill at least a portion of the space in the erosion gully to be treated to form a backfill body; S2: Install a concealed drainage system in or above the landfill; S3: A topsoil layer is formed over the landfill and the underground drainage system.

[0012] According to the method for treating newly added or restored gullies in cultivated land provided by the present invention, before step S1, the method further includes: The predetermined flood discharge cross section of the erosion gully is determined based on the calculation of the rainfall intensity in the catchment area, and slope protection units are laid out along the predetermined flood discharge cross section; Specifically, step S1 involves filling the space between the slope protection unit and the original erosion gully bank.

[0013] According to the method for treating newly added or restored erosion gullies of cultivated land provided by the present invention, step S1 specifically includes: The erosion gully to be treated is completely filled to form the landfill.

[0014] According to the method for treating newly added or restored gullies in cultivated land provided by the present invention, when straw is used for backfilling in step S1, step S2 specifically includes: A space is reserved in the straw for the installation of the underground drainage system; The location of the installation is filled with usable soil, and the underground drainage system is buried in the usable soil; and Non-woven fabric is laid at the junction of the soil and the straw for isolation.

[0015] This invention provides a structure and method for treating gully erosion in farmland, which involves laying a subsurface drainage system beneath the topsoil and above a backfill. When rainfall or surface water accumulates on the topsoil, the water preferentially infiltrates vertically into the soil, effectively dissipating its kinetic energy rather than forming surface runoff with scouring potential. The infiltrated water is then effectively collected by the subsurface drainage system and discharged in an orderly manner as underground pipe flow without scouring hazards. This design eliminates the hydrodynamic conditions that lead to secondary erosion of the topsoil at the source. Simultaneously, the anti-clogging layer covering the outside of the subsurface drainage system effectively prevents sediment from entering the pipes, avoiding clogging and ensuring long-term stable and reliable drainage. The backfill, filling the gully, provides a solid and stable foundation for the upper topsoil and the subsurface drainage system, making the overall structure less prone to uneven settlement and deformation. In this way, through the synergistic effect of the landfill, topsoil, and underground drainage system, the direct scouring force of surface water on the newly added topsoil is greatly reduced, effectively preventing secondary erosion and ensuring the long-term stability and sustainable use of the treated farmland. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the newly added and restored arable land for the treatment of erosion gullies with narrow cross sections provided by the present invention.

[0018] Figure 2 This is a schematic diagram of the newly added and restored arable land in the treatment of erosion gullies by material landfilling provided by the present invention.

[0019] Figure 3 This is a schematic diagram of the overall structure of the technology for treating narrow-section erosion gullies and restoring arable land provided by the present invention.

[0020] Figure 4 This is a schematic diagram of the layout of the underground pipe drainage system under the straw burial method provided by the present invention.

[0021] Figure 5 This is a schematic diagram of the layout of the underground drainage system under the coal gangue landfill method provided by the present invention.

[0022] Figure 6 This is a schematic diagram of the layout of the underground pipe drainage system under the comprehensive utilization of soil landfill method provided by the present invention.

[0023] Figure 7 This is a flowchart illustrating a method for treating newly added or restored erosion gullies in cultivated land, provided by the present invention.

[0024] Figure label: 10. Landfill; 20. Topsoil layer; 30. Planting layer; 40. Underground drainage system; 50. Anti-blocking layer; 60. Slope protection unit; 70. Compacted soil layer; 80. Utilized soil layer; 90. Non-woven fabric isolation layer. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0026] The following is combined Figures 1 to 7 This invention describes a structure and method for treating newly added or restored erosion gullies in cultivated land.

[0027] In embodiments of the present invention, such as Figure 3 As shown, a structure and method for treating gullies in newly added or restored farmland includes a backfill body 10, a topsoil layer 20, and a subsurface drainage system 40. The backfill body 10 is placed in the gully to be treated to fill at least a portion of the space of the gully. The topsoil layer 20 covers the top of the backfill body 10, forming a planting layer 30 for newly added or restored farmland. The subsurface drainage system 40 is laid below the topsoil layer 20 and buried above the backfill body 10. The subsurface drainage system 40 is covered with an anti-blocking layer 50 to convert surface runoff and soil water flowing into the topsoil layer 20 into groundwater and discharge it.

[0028] The filler 10 is placed in the erosion gully to be treated and fills at least part of the space of the erosion gully. It can fill and level the sunken and unstable erosion gully channel, forming a dense and uniform support base. It avoids the settlement and deformation of the superstructure caused by the original topographic undulation of the gully channel and the loose soil. It provides a stable foundation for the construction of the topsoil layer 20 and the underground drainage system 40. At the same time, it realizes the effective use of the erosion gully space and creates flat terrain conditions for the addition or restoration of arable land.

[0029] The topsoil layer 20 covers the top of the landfill 10 and is the planting layer 30 for newly added or restored arable land. It directly provides a soil environment that meets the standards for crop growth and is the structure that enables the land to be cultivated after the gully erosion treatment. This allows the treated gully erosion area to be truly transformed into arable land, achieving the goal of restoring or adding arable land.

[0030] The underground drainage system 40 is laid beneath the topsoil layer 20 and above the backfill 10, and is covered with an anti-clogging layer 50 on the outside. Its core functions are to guide runoff and prevent erosion. Specifically: First, it can promptly convert surface runoff and soil water flowing into the topsoil layer 20 into groundwater for discharge, preventing runoff from accumulating and flowing on the surface of the topsoil layer 20 and causing direct erosion. This reduces the erosive force of surface water on the topsoil layer 20 from the source and prevents the topsoil layer 20 from being eroded and damaged. Second, the anti-clogging layer 50 on the outside can effectively block silt from entering the underground pipe, preventing blockage of the drainage holes and pipes, ensuring the long-term stable operation of the underground drainage system 40, and continuously exerting its runoff guidance effect. At the same time, the underground layout does not occupy the surface space of the farmland, does not affect agricultural machinery farming and crop planting, and meets the actual needs of farmland use.

[0031] This application involves placing the underground drainage system 40 beneath the topsoil layer 20 and above the backfill 10. When rainfall or surface water accumulates on the surface of the topsoil layer 20, the water preferentially infiltrates vertically into the soil through seepage, effectively dissipating its kinetic energy rather than forming surface runoff with scouring potential. The infiltrated water is then effectively collected by the underground drainage system 40 and discharged in an orderly manner as underground pipe flow without scouring hazards. This design eliminates the hydrodynamic conditions that could lead to secondary erosion of the topsoil layer 20 at its source. Simultaneously, the anti-clogging layer 50 covering the outside of the underground drainage system 40 effectively prevents sediment from entering the pipe, avoiding clogging of the drainage channel and ensuring long-term stable and reliable drainage. The backfill 10, filled within the erosion gully, provides a solid and stable bearing foundation for the upper topsoil layer 20 and the underground drainage system 40, making the overall structure less prone to uneven settlement and deformation. In this way, through the synergistic effect of the landfill 10, the topsoil layer 20 and the underground drainage system 40, the direct scouring force of surface water on the newly added topsoil layer 20 is greatly reduced, effectively preventing secondary erosion and ensuring the long-term stability and sustainable use of the treated farmland.

[0032] In some embodiments, according to the present invention, a new or restored farmland erosion gully treatment structure includes a submerged drainage system 40 comprising a corrugated pipe and an anti-clogging layer 50 consisting of a non-woven fabric wrapped around the outside of the corrugated pipe.

[0033] Understandably, corrugated pipes, as the main structure of the underground drainage system 40, possess excellent structural flexibility, adapting to the regional geological characteristics of black soil areas, such as soil frost heave and thaw settlement and slight foundation settlement. They can adapt to minor deformations of the surrounding soil, effectively preventing structural cracking, collapse, and other damage to the pipes, ensuring the structural integrity and long-term water flow of the drainage channel. Furthermore, corrugated pipes have uniform molding specifications and excellent water-carrying capacity due to their corrugated structure, facilitating the selection of appropriate specifications based on the flow requirements of the erosion gully. Their splicing and laying operations during field construction are also simple, making them suitable for field construction scenarios in erosion gully control. In addition, corrugated pipes have good corrosion resistance and soil compression resistance, resisting acid and alkali corrosion and soil pressure in the complex soil environment above the landfill 10 and below the cultivated soil layer 20, effectively extending the service life of the underground drainage system 40.

[0034] Non-woven fabric is wrapped around the outside of the corrugated pipe as an anti-clogging layer 50. It has the characteristics of water permeability and soil filtration, which can allow water from the topsoil layer 20 and the backfill 10 to seep into the corrugated pipe smoothly, ensuring the normal function of drainage. At the same time, it can effectively block the entry of silt and soil particles into the pipe, prevent the drainage holes and pipe body of the corrugated pipe from becoming clogged, and avoid the surface runoff from eroding the topsoil layer 20 due to drainage failure. At the same time, the non-woven fabric can isolate the corrugated pipe from the surrounding soil, prevent the pipe body displacement caused by direct contact between the soil and the corrugated pipe under the action of interflow, and reduce the wear of soil particles on the pipe wall, further forming a structural protection for the corrugated pipe. Moreover, the non-woven fabric is soft and easy to lay. It can completely cover the outside of the corrugated pipe and adapt to its corrugated structure to achieve full circumferential anti-clogging protection for the corrugated pipe. When laid in conjunction with the corrugated pipe, no additional complicated procedures are required, which balances the protective effect and construction efficiency.

[0035] The corrugated pipe and the non-woven fabric covering its outer side work together. The corrugated pipe adapts to the soil environment of the erosion gully treatment area based on its own structural characteristics, ensuring the structural stability and flow capacity of the underground drainage system 40. The non-woven fabric solves the problem of clogging in the underground drainage system. The combination of the two allows the underground drainage system 40 to be buried stably in the soil between the cultivated soil layer 20 and the backfill 10 for a long time, continuously playing the role of guiding surface runoff and soil water, effectively ensuring the runoff discharge effect, continuously reducing the direct scouring force of surface water on the cultivated soil layer 20, and thus preventing secondary erosion.

[0036] Reference Figure 3 According to the present invention, a new or restored farmland erosion gully treatment structure further includes a slope protection unit 60, which is arranged along the preset flood discharge section of the erosion gully, and the fill body 10 is set between the slope protection unit 60 and the original erosion gully bank; the slope protection unit 60 is selected from at least one of willow pile bank protection, ecological bag slope protection, gabion slope protection or ecological brick slope protection.

[0037] Understandably, the slope protection unit 60 is laid out along the preset flood discharge section, which can form a stable constraint on the banks of the erosion gully while meeting the flood discharge and drainage requirements of the gully. It can effectively resist the lateral erosion and scouring of the gully slope by the water flow in the gully, inhibit the collapse of the gully bank, the head of the gully, and the downcutting and expansion of the gully bottom, and provide a stable external boundary environment for the entire treatment structure, so as to avoid the instability of the gully slope from causing damage to the internal fill 10 and the topsoil layer 20.

[0038] By placing the landfill 10 between the slope protection unit 60 and the original erosion ditch bank, the landfill 10 can be placed within the effective protection range of the slope protection unit 60, preventing water flow from directly eroding the edge of the landfill 10 and causing the loss of the filled soil. At the same time, the slope protection unit 60 regulates and limits the landfill area, ensuring that the landfill 10 is uniformly formed and reliably supported, providing a stable lower foundation for the upper cultivated soil layer 20 and the underground drainage system 40, and ensuring the stability of the overall structure.

[0039] Willow stake revetment, ecological bag slope protection, gabion slope protection, and ecological brick slope protection are all mature structures suitable for slope protection of erosion gullies. They have good soil stabilization and slope stability capabilities, which can effectively prevent the collapse and sliding of gully slope soil, control the development process of gully head tracing and gully bottom incision, and at the same time, can achieve precise narrowing of gully cross-section through reasonable layout, enclosing a regular space for the setting of fill body 10, laying a stable topographic foundation for the subsequent layout of fill body 10 and topsoil layer 20, and meeting the core requirements of stabilizing gully slope and determining gully shape in erosion gully management.

[0040] Different slope protection structures each possess their own adaptability advantages, allowing for flexible selection based on the slope gradient, soil properties, and construction conditions of the erosion gully to be treated, thus adapting to different treatment scenarios. Willow pile revetments combine biological and engineering measures, continuously enhancing slope stabilization as plants grow, offering excellent ecological benefits and readily available materials, making them suitable for gentle gully slopes; ecological bag revetments can be flexibly stacked, adapting to irregular gully slopes, with soil and plant seeds filling the bags to promote vegetation growth, balancing slope stabilization and ecological restoration; gabion revetments are flexible protective structures, adaptable to uneven foundation settlement, frost heave and thaw settlement, and slight gully slope sliding, exhibiting strong engineering stability, making them suitable for steep slopes and complex gully slopes with loose soil; ecological brick revetments offer good permeability and air permeability, promoting slope vegetation growth, are easy to construct, and have a regular structure after completion, making them suitable for treatment scenarios requiring both aesthetic and ecological balance around cultivated land.

[0041] Reference Figures 4 to 6 According to the present invention, a new or restored erosion gully treatment structure is provided, wherein the filler 10 is completely filled into the erosion gully to be treated; And / or, the landfill 10 is composed of at least one of bundled and compacted straw, coal gangue, or recycled soil.

[0042] Understandably, completely filling the erosion gully with the fill body 10 can completely eliminate the original depressions, steep slopes and other unstable terrain of the gully, making the treatment area flat and uniform as a whole, providing a continuous and stable support base for the upper topsoil layer 20, and avoiding the settlement, cracking or collapse of the topsoil layer 20 due to the lack of filling in some parts of the gully; at the same time, it can completely block the lateral scouring and headward erosion of the gully slope by the water flow in the gully, eliminating the conditions for the erosion gully to continue to develop in space, providing a safe and regular terrain environment for newly added or restored farmland, and ensuring the long-term stable use of farmland.

[0043] Bundled and compacted straw, coal gangue, and comprehensive utilization soil all have good filling and compaction characteristics. After being filled and compacted in layers, they can form a dense and flat landfill body 10, which can effectively fill the uneven spaces of the erosion ditch and provide a solid and stable bearing base for the topsoil layer 20. This prevents the topsoil layer 20 from collapsing or cracking due to loose base and settlement, ensuring the stability of the soil structure of the topsoil layer 20. At the same time, it makes the landfill body 10 form a regular base shape, which meets the topographic requirements of newly added or restored farmland.

[0044] Baled and compacted straw, coal gangue, and comprehensively utilized soil are readily available materials in the black soil region. Straw is a common agricultural waste in the black soil region, coal gangue is industrial solid waste in some areas, and comprehensively utilized soil is waste soil from production and construction projects. Selecting these materials to fill landfill body 10 eliminates the need for additional mining of special filling soil, significantly reducing the amount of soil extracted and construction costs. At the same time, it realizes the resource utilization of various wastes, meeting the dual requirements of ecological governance and resource conservation. Furthermore, baled and compacted straw is easy to transport and lay, and coal gangue and comprehensively utilized soil can be directly filled in layers, all of which are suitable for the operational conditions of field construction in erosion gullies, improving the construction and layout efficiency of landfill body 10.

[0045] Different materials have their own advantages and can be flexibly selected according to the geological conditions and surrounding resource distribution of the erosion gully to be treated, making them highly adaptable. Baled and compacted straw has a loose texture and moderate porosity, which can improve the soil permeability and water retention of the landfill 10 after filling. Subsequent degradation can also increase the organic matter content of the soil, improve the soil structure of the soil under the cultivated soil layer 20, and benefit crop growth. Coal gangue has a hard texture and strong erosion resistance, which makes the overall erosion resistance of the landfill 10 better after filling, making it suitable for erosion gully treatment scenarios with many confluences. The soil properties of the comprehensive utilization soil are closer to those of cultivated soil, and it can quickly form a stable base after filling, reducing the need for subsequent soil improvement procedures, making it suitable for treatment scenarios with high construction efficiency requirements.

[0046] In some embodiments, according to the present invention, a new or restored gully erosion control structure for cultivated land is provided, wherein when the landfill material is straw, the straw is a bundled and compacted rectangular straw bundle, the density of the straw bundle is greater than 230 kg / m³, and the weight of a single straw bundle is less than 50 kg. The upper and lower layers of the underground drainage system 40 are both covered with a soil layer 80, and a non-woven fabric isolation layer 90 is laid between the soil layer 80 and the straw.

[0047] Understandably, designing the straw as a bundled and compacted cuboid with a density greater than 230 kg / m³ and a single weight less than 50 kg serves two purposes. First, the regular shape of the cuboid straw bundles allows for tight splicing and layered compaction after filling, forming a dense and flat landfill body 10. This improves the overall structural density of the landfill body 10, preventing settlement caused by excessive gaps due to loose straw filling. It also provides uniform and stable base support for the topsoil layer 20, preventing cracking and collapse due to uneven base settlement. Second, the compaction density of greater than 230 kg / m³ strengthens the structural strength and erosion resistance of the straw bundles themselves, reducing the damage of runoff erosion to the landfill body 10. At the same time, the design of a single weight of less than 50 kg is suitable for the transportation and laying conditions in field construction of erosion gullies, eliminating the need for large construction equipment and improving the convenience and efficiency of the construction and layout of the landfill body 10.

[0048] The upper and lower layers of the underground pipe drainage system 40 are both covered with soil layers 80. The compactness of the soil layer 80 provides rigid support and protection for the underground pipe drainage system 40 from both above and below. This effectively counteracts the soil settlement force generated by the decomposition and degradation of straw after landfill, preventing deformation, displacement, or even damage to the underground pipe due to straw settlement. This ensures the structural integrity of the underground pipe drainage system 40 and guarantees unobstructed drainage channels. At the same time, the soil layer 80 physically isolates the underground pipe from the straw landfill layer, reducing the pollution and blockage of the underground pipe caused by impurities generated during straw degradation. This further maintains the drainage function of the underground pipe and ensures the long-term stable operation of the drainage system.

[0049] A non-woven fabric isolation layer 90 is laid between the soil layer 80 and the straw. The non-woven fabric has the characteristics of water permeability and soil filtration. It does not affect the drainage of water from the topsoil layer 20 and the soil layer 80 to the underground pipe. At the same time, it can effectively prevent soil particles from the topsoil layer 80 from entering the straw landfill layer under the action of interflow. This prevents soil particles from filling the gaps between the straw and causing uneven soil structure in the landfill 10. It also prevents debris from straw degradation from entering the topsoil layer 80 and causing soil compaction. This ensures the support effect of the topsoil layer 80 and the water permeability of the landfill 10. In addition, the non-woven fabric can form a structural isolation between the topsoil layer 80 and the straw landfill layer, reducing the mutual disturbance between the soil and the two, further improving the overall structural stability of the landfill 10. At the same time, it provides indirect protection for the underground pipe drainage system 40, preventing the underground pipe from being displaced or deformed due to the interaction between the soil layer and the straw layer.

[0050] Reference Figure 3According to the present invention, a structure for treating erosion gullies in newly added or restored farmland is provided, which further includes a compacted soil layer 70. The compacted soil layer 70 is backfilled on the back of the slope protection unit 60 and compacted to form a basic support for the slope protection unit 60.

[0051] Understandably, after backfilling, the compacted soil layer 70 is compacted to form a dense soil structure. It adheres to the back of the slope protection unit 60 to form a rigid support, which can effectively offset the lateral pressure generated by the eroded slope soil and the scouring force of water flow on the slope protection unit 60. This prevents the slope protection unit 60 from tilting, sliding, collapsing, or other structural damage under external forces, ensuring that the slope protection unit 60 maintains a stable layout and that its core function of stabilizing the slope and preventing the collapse and sliding of the slope soil can continue to be performed.

[0052] The compacted soil layer 70 provides a stable foundation support for the slope protection unit 60, ensuring the long-term stability of the narrowing effect of the slope protection unit 60 on the cross-section of the ditch. This prevents deformation of the ditch area enclosed by the slope protection unit 60 and damage to the boundary of the fill body 10 due to displacement of the slope protection unit 60. It ensures that the fill body 10 is always within the effective protection range of the slope protection unit 60, providing a regular and stable spatial foundation for the layout of the fill body 10 and the topsoil layer 20. This prevents changes in the ditch shape from disturbing the farmland base and ensures the stability of the support of the fill body 10 to the topsoil layer 20.

[0053] Reference Figure 7 The present invention also provides a method for treating newly added or restored erosion gullies in cultivated land, comprising the following steps: S1: Under the premise of ensuring the safety of flood discharge in the gully, at least a part of the space in the erosion gully to be treated is filled to form a fill body 10; Specifically, by filling the erosion gully to form a fill body 10, the sunken, loose and easily eroded gully space can be filled and leveled, eliminating the unfavorable terrain conditions of the original erosion gully, providing a dense, uniform and stable lower support structure for the subsequent underground drainage system 40 and the cultivated soil layer 20, and at the same time blocking the path of the erosion gully to continue to trace back to its source and expand laterally, creating a flat and safe basic terrain for the restoration of cultivated land.

[0054] S2: Install a concealed drainage system 40 in or above the landfill 10; specifically, the concealed drainage system 40 is installed in or above the landfill 10, which can form a concealed drainage channel below the cultivated soil layer 20, and can collect and drain the infiltrated surface runoff and soil water in a timely manner, avoiding the accumulation of water in the cultivated soil layer 20 or on the surface to form scouring water flow, reducing the scouring and erosion of the cultivated soil layer 20 from the perspective of water dynamics, and preventing secondary erosion of newly added cultivated land; at the same time, this method of installation does not occupy the surface space of cultivated land and does not affect subsequent agricultural cultivation and crop growth.

[0055] S3: A topsoil layer 20 is formed by covering the landfill 10 and the underground drainage system 40. Specifically, the topsoil layer 20 provides a suitable tillage medium for crop growth, allowing the treated gully area to be directly converted into arable land, achieving the goals of gully control and the creation and restoration of arable land. At the same time, the topsoil layer 20 can cover and protect the underground drainage system 40 below, reducing the impact of surface load, temperature changes, and external disturbances on the underground pipe structure, ensuring the long-term stable operation of the underground drainage system 40, and thus ensuring the structural stability and sustainable use of the treated arable land.

[0056] In some embodiments, according to the method for treating newly added or restored gullies of cultivated land provided by the present invention, before step S1, the method further includes: The preset flood discharge cross section of the erosion gully is determined based on the calculation of the rainfall intensity in the catchment area, and slope protection units 60 are laid out at the preset flood discharge cross section; Specifically, step S1 involves filling the space between the slope protection unit 60 and the original erosion gully bank.

[0057] Understandably, determining the preset flood discharge cross-section of the erosion gully based on the calculation of the rainfall intensity in the catchment area can ensure that the size of the treated gully matches the regional rainfall runoff conditions. Under the premise of meeting the safe discharge of floodwaters during the flood season, the narrowing range of the gully and the filling boundary can be reasonably determined to avoid flood overflow and erosion of farmland due to insufficient flood discharge cross-section. This ensures the flood control safety and overall stability of the treatment structure from the design source.

[0058] By deploying slope protection units 60 along the pre-set flood discharge section, a stable external protection can be formed for the banks of the eroded gully, effectively resisting the lateral erosion and headward erosion of the gully slope by the water flow, preventing the collapse of the gully bank and the expansion of the gully, providing a regular and safe construction boundary for subsequent landfill operations, and providing a stable external constraint environment for the overall treatment structure.

[0059] By limiting step S1 to filling between the slope protection unit 60 and the original erosion gully bank, the fill body 10 can be formed within the protection range of the slope protection unit 60. This avoids water flow directly eroding the edge of the fill body 10 and causing soil loss, while ensuring that the fill body 10 is uniformly formed and reliably supported. This lays a stable foundation for the upper underground drainage system 40 and the topsoil layer 20, making the slope protection, filling, drainage and topsoil layer form a synergistic system. This further prevents secondary erosion of newly added farmland and ensures the long-term stability and sustainable use of farmland after treatment.

[0060] In some embodiments, according to the method for treating newly added or restored erosion gullies of cultivated land provided by the present invention, step S1 specifically comprises: The erosion gully to be treated is completely filled to form a landfill 10.

[0061] Understandably, by completely filling the erosion gullies, the depressions, steep slopes, and confluence spaces of the original gullies can be completely eliminated, making the overall terrain of the treated area flat, continuous, and uniform. This provides a dense, stable, and elevation-free support base for the subsequent installation of underground drainage systems and the covering of topsoil layers. It effectively avoids uneven settlement, cracks, or collapses caused by unfilled local gullies. At the same time, it completely blocks the path for the erosion gullies to continue developing, providing a safe and regular terrain environment for newly added or restored arable land and ensuring the long-term stable use of arable land.

[0062] In some embodiments, according to the method for treating newly added or restored eroded gullies of cultivated land provided by the present invention, when straw is used for backfilling in step S1, step S2 specifically includes: A space is reserved in the straw for the installation of the underground drainage system 40; The installation location is filled with usable soil, and the underground drainage system 40 is buried in the usable soil; and Non-woven fabric is laid at the junction of soil and straw for isolation.

[0063] Understandably, reserving a dedicated installation location for the underground drainage system 40 within the straw can prevent loose and easily deformable straw from directly squeezing the underground pipe, providing a regular and stable installation space for the underground pipe, preventing it from shifting, twisting, or breaking during construction and later use, ensuring a smooth drainage path, and ensuring that the underground drainage system 40 can properly perform its runoff guiding function.

[0064] The reserved location is filled with usable soil and the underground pipe is buried in the usable soil. The usable soil has a uniform texture and high density, which can provide uniform support for the underground pipe, effectively offsetting the uneven force caused by the later degradation and settlement of straw, preventing the underground pipe from breaking or failing due to uneven stress, ensuring the long-term stable operation of the underground pipe, and continuously playing its role in drainage and erosion prevention.

[0065] By laying non-woven fabric at the junction of the soil and straw, straw fragments can be prevented from entering the soil and underground pipes and causing blockages without affecting underwater drainage. At the same time, it can prevent soil particles from falling into the gaps between straw and causing local subsidence, so that the two layers of structure remain stable and avoid mutual disturbance. This further ensures the stability of the underground pipe drainage system 40 and the overall support effect of the backfill 10, and indirectly protects the cultivated soil layer 20 from cracking and collapse.

[0066] Reference Figures 1 to 3In one specific embodiment, the first step is to determine the measures for newly added and restored farmland in gully erosion control. The first step is to determine the suitable control path, either by narrowing the cross-section or by landfilling. Narrowing the cross-section is suitable for medium and small gullies with a depth of less than 3 meters, while landfilling is suitable for medium and small gullies with a depth of less than 2 meters. Gully control measures under the narrowing cross-section method include willow stake revetment, eco-bag slope protection, gabion slope protection, and eco-brick slope protection. Landfilling methods include straw / coal gangue / comprehensive soil landfilling; the implementation guidelines can be found in relevant technical standards.

[0067] When using the narrow cross-section method to manage gullies, it is necessary to determine the flood discharge cross-sectional area of ​​the gully channel for newly added and restored farmland, thereby clarifying the areas for newly added and restored farmland. The determination of the flood discharge cross-sectional area of ​​the gully channel first determines the local maximum 1-hour rainstorm intensity with a 10-year return period according to the design specifications, then calculates the peak flow, generalizes the flood discharge cross-section of the gully into a rectangular cross-section, and determines the width of the rectangular flood discharge cross-section according to the Manning formula.

[0068] The underground drainage pipes are laid 50-60 cm underground, with the length matching the width of the newly cultivated land on one side of the ditch. The pipes are corrugated and wrapped with non-woven fabric to prevent silt from clogging the drainage holes. The inner diameter of the pipes is 20 cm, and the lateral spacing is generally 2-5 meters, which can be adjusted according to the drainage volume. When using straw as burial material, the decomposition of straw over time can cause settlement in the burial area, leading to deformation or damage to the drainage pipes and affecting their function. Therefore, when burying straw, the upper and lower layers of the drainage pipes are filled with usable soil to avoid the impact of straw decomposition. Simultaneously, non-woven fabric is laid at the junction of the straw and usable soil to prevent soil from entering the straw under interflow, causing displacement or deformation of the pipes. For landfilling, use bundled and compacted straw bales, preferably rectangular in shape. The dimensions can be determined based on the overall size of the landfill. The density should be greater than 230 kg / m³. To facilitate laying and construction, the weight of a single straw bale should be less than 50 kg. Landfilling of coal gangue and comprehensively utilized soil should meet the requirements of relevant technical standards.

[0069] Topsoil / improved soil should be backfilled on top of the material landfill to a depth of 50 cm. This soil layer is used for crop growth. Therefore, if the original excavated soil can meet the conditions for crop planting, the excavated soil should be used directly first. If the excavated soil does not meet the conditions for use, or if the backfill soil is for comprehensive utilization, the excavated soil or comprehensive utilization soil needs to be improved to meet the conditions for crop growth. The relevant soil improvement technical standards should meet the requirements of national and local technical specifications.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An added or restored cultivated erosion ditch treatment structure, characterized in that, include: A landfill body (10) is disposed within the erosion gully to be treated, for filling at least a portion of the space of the erosion gully; A topsoil layer (20), which covers the top of the landfill (10), constitutes a planting layer (30) for newly added or restored arable land; and The underground drainage system (40) is laid under the cultivated soil layer (20) and buried on the top of the landfill (10). The underground drainage system (40) is covered with an anti-blocking layer (50) to convert the surface runoff and soil water flowing into the cultivated soil layer (20) into groundwater and discharge it.

2. The added or restored cultivated erosion ditch treatment structure according to claim 1, characterized in that It also includes a slope protection unit (60), which is laid out along the preset flood passage section of the erosion gully, and the fill body (10) is set between the slope protection unit (60) and the original erosion gully bank; And / or, the slope protection unit (60) is selected from at least one of willow pile bank protection, eco-bag slope protection, gabion slope protection or eco-brick slope protection.

3. The added or restored till erosion ditch treatment structure according to claim 1, characterized in that, The concealed pipe drainage system (40) includes a corrugated pipe, and the anti-clogging layer (50) is a non-woven fabric wrapped around the outside of the corrugated pipe.

4. The added or restored till erosion ditch treatment structure according to claim 1, characterized in that, The landfill (10) completely fills the erosion ditch to be treated; And / or, the landfill (10) is composed of at least one of bundled and compacted straw, coal gangue or soil from comprehensive utilization.

5. The added or restored cultivated erosion ditch treatment structure according to claim 4, characterized in that When the landfill material of the landfill body (10) is straw, the straw is a bundled and compacted rectangular straw bundle, the density of the straw bundle is greater than 230 kg / m³, and the weight of a single straw bundle is less than 50 kg; The upper and lower layers of the underground drainage system (40) are both covered with a soil layer (80), and a non-woven fabric isolation layer (90) is laid between the soil layer (80) and the straw.

6. The added or restored cultivated erosion ditch treatment structure according to claim 2, characterized in that, It also includes a compacted soil layer (70), which is backfilled on the back of the slope protection unit (60) and compacted to provide basic support for the slope protection unit (60).

7. A method of treating an incipient or restored cultivated erosion gully, characterized in that Includes the following steps: S1: Under the premise of ensuring the safety of flood discharge in the gully, at least part of the space in the erosion gully to be treated is filled to form a fill body (10). S2: Install a concealed drainage system (40) in or above the landfill (10); S3: A topsoil layer (20) is formed on top of the landfill (10) and the underground drainage system (40).

8. The method for treating newly added or restored erosion gullies in cultivated land according to claim 7, characterized in that, Before step S1, the following is also included: The preset flood discharge section of the erosion gully is determined based on the calculation of the rainfall intensity in the catchment area, and slope protection units (60) are arranged along the preset flood discharge section. Specifically, step S1 involves filling the space between the slope protection unit (60) and the original erosion gully bank.

9. The method for treating newly added or restored erosion gullies in cultivated land according to claim 7, characterized in that, Step S1 is as follows: The erosion gully to be treated is completely filled to form the landfill (10).

10. The method of claim 7, wherein, When straw is used for landfill in step S1, step S2 specifically includes: A space is reserved in the straw for the installation of the underground drainage system (40); Fill the designated location with usable soil and bury the underground drainage system (40) within the usable soil; and The nonwoven fabric is arranged at the joint of the soil and the straw for isolation.

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