A mudstone ecological slope protection structure with a columnar geogrid base bed

Abstract

The invention discloses a mudstone ecological slope protection structure with a columnar geogrid base bed, which is used for a river channel with a flow rate of less than 4.0m / s, including a layer of block stones laid at intervals on the river channel slope, soil filled between the blocks, and a columnar geogrid base bed buried in the soil, and herbaceous plants planted in the soil, wherein the soil content is 50-60%. The advantages of the structure of the invention are: less block stone usage, less environmental impact, random arrangement of blocks, soil content between blocks can reach 60%, less block stone usage, and reducing the impact of block stone mining on the ecological environment. Good anti-scouring effect and low cost. The geogrid is buried in the soil in a columnar shape to form an embedded effect like a soil nail. The geogrid is entangled with the plant root system, and with the support of the block stone skeleton, the anti-scouring ability of the slope protection is significantly improved. Due to the low cost of the geogrid, the overall cost is not high. It can be applied to slope slope protection with a design flow rate of less than 4m / s.

Description

Technical Field

[0001] The present application belongs to the field of water conservancy engineering, and in particular relates to a mud-stone ecological slope protection structure with a columnar geogrid base bed. Background Art

[0002] my country has many rivers and a long history of water management. Flood control and security have always been important tasks for protecting people's livelihood in all dynasties. In order to ensure the safety of embankments under the scouring of water, embankment protection is a necessary engineering measure. In modern times, with the increase of population, resources, and environmental pressures and the improvement of technical capabilities, the solidification and hardening of river embankments has become a trend. Subsequently, human beings have made significant progress in their understanding of the environment and ecology, and the construction of ecological civilization has become the main theme, and the ecological management of rivers has become the main way of river management.

[0003] At present, ecological revetments mainly include pure plant revetments, geotextile reinforced plant revetments, piled (dumped) stone revetments, gabion revetments, dry (mortar) stone masonry revetments, vegetated concrete revetments, and conventional concrete revetments. These types of revetments have their own advantages and disadvantages in terms of anti-scouring ability and ecological functions. From the development trend of science and technology, it is of great significance to continuously develop new types of river ecological revetments that can meet the requirements of anti-scouring and have good ecological functions and economic benefits, so as to better adapt to the needs of river ecological construction, implement the concept of "green water and green mountains are gold and silver mountains", and build a happy river that satisfies the people.

[0004] The article "A Brief Discussion on River Ecological Bank Protection and Plant Slope Protection Design" discloses the use of riprap to press willows for bank slope protection, mainly using stone blocks and willow branches as bank protection materials. This willow branch plus riprap structure is an ancient river management technology. Its core is to weave the grown willow branches into rows to cover the slope surface. In order to prevent the willow branches from being washed away by the water flow, riprap is used for weighting. However, the willow branches of this structure are woven into a horizontal arrangement, and the willow branches must be submerged in water for a long time to prevent them from rotting. This kind of structural willow branches does not reflect the slope fixing function of plants.

[0005] Chinese patent application (2014101000028) discloses a method for constructing river slope protection with ecological gabion mesh: during the slope protection construction stage, after the gabion slope protection construction is completed, soil is refilled and water is poured into the gaps between the surface stones to ensure that the soil fills the gaps between the stones, thereby covering the stone slope protection with a layer of cultivated soil; and using this layer of cultivated soil as the base bed, aquatic plants are planted under the water surface, and lawns are planted on the river bank to achieve the functions of plant slope consolidation and ecological improvement; the key technical point of this patent is to give full play to the role of gabions, connecting the stones with gabions to form a structure with a higher anti-scouring flow rate, rather than the slope consolidation effect of plants. At the same time, from the perspective of economy, the structure has a high investment per linear meter and is difficult to be widely promoted.

[0006] Chinese patent application (2012200609957) discloses an ecological slope protection for water conservancy projects. The main structure is to lay bagged soil on the stone layer and plant plants in the bagged soil. However, the price of this geotextile bag that takes into account both anti-corrosion and anti-impact properties is relatively high. Currently, the raw materials mainly rely on imports, and the project cost is relatively high. At the same time, the structure requires that the stones under the bagged soil are closely arranged and masonry, and the porosity between the stones is relatively small. The bagged soil and the lower part each have their own protective role, and the bite effect between the soil and the stone cannot be brought into play. Its anti-impact ability mainly depends on the bagged soil and plants. Chinese patent application (2019108737470) discloses an ecological reconstruction method and ecological reconstruction structure for urban hardened revetments. The structure is to cover the built stone layer with soil and cultivate plants. The stone and soil are not organically mixed. Only a layer of plants is covered on the surface of the stone for protection. Its anti-scouring ability mainly depends on the anti-scouring ability of the surface plants. If the anti-scouring ability of the surface plants is exceeded, the upper soil layer will be washed away and peeled off by the water flow, and the ecological layer will be damaged. Summary of the invention

[0007] In response to the above technical problems, the present application provides a mud-stone ecological slope protection structure with a columnar soil grid base bed.

[0008] A mudstone ecological slope protection structure with a columnar geogrid base bed is used for rivers with a flow rate below 4.0m / s, including a layer of blocks of stone laid at intervals on the river slope, soil filled between the blocks of stone, and a columnar geogrid base bed buried in the soil, wherein herbaceous plants are planted in the soil, wherein the soil content is 50-60%.

[0009] Furthermore, the columnar geogrid base bed is buried at a spacing of 30-50 cm.

[0010] Furthermore, the soil thickness on the river channel slope is 35-45 cm; the columnar geogrid base bed has a diameter of 20 cm and a height of 20-30 cm; and the top of the columnar geogrid base bed is 5-8 cm away from the soil surface.

[0011] Furthermore, the columnar geogrid base bed is formed by rolling the geogrid into a cylindrical shape and then fixing it.

[0012] Furthermore, the volume of the stone blocks is 40-50% of the volume of the slope protection.

[0013] Furthermore, the soil thickness on the river channel slope (i.e., slope protection thickness) is 40 cm.

[0014] Furthermore, the selection of the columnar geogrid base bed needs to meet the following conditions: longitudinal / transverse tensile strength ≥15.0KN / m, longitudinal / transverse tensile strength at 2% elongation ≥5.0KN / m, longitudinal / transverse tensile strength at 5% elongation ≥7.0KN / m, longitudinal / transverse 5% elongation ≤15.0 / 13.0.

[0015] Furthermore, the minimum thickness of the block is not less than 20cm, the unit weight is not less than 25kg, and the bulk density of the stone is ≥25kN / m 3 , softening coefficient>0.75, saturated compressive strength≥30Mpa, and the exposed surface of the stone along the slope is basically flat.

[0016] Furthermore, the soil includes but is not limited to red soil, paddy soil, coarse bone soil or yellow soil with certain nutrients and clay soil.

[0017] Furthermore, the herbaceous plants are Bermuda grass, tall fescue, Setaria viridis, Artemisia selengensis, Goosegrass, Digitaria sanguinea, Echinochloa crus-galli, and Silvergrass.

[0018] Arrangement of herbaceous plants in the present invention: There are two ways to plant plants in the soil: the first way: if the slope protection construction before the flood season has the conditions for grass growth, grass seeding can be carried out. In this case, uniform sowing can be adopted; the second way: if the slope protection construction before the flood season does not have the conditions for grass growth, grass planting units can be transplanted, and the spacing between grass planting units is 8 to 12 cm. (5 to 8 grass plants are regarded as one grass planting unit)

[0019] Before introducing the present invention, the mudstone ecological slope protection structure with a columnar geogrid base bed, the applicant first introduces a mudstone ecological slope protection system without a columnar geogrid base bed: the description is as follows:

[0020] Innovative ideas: At present, there is no concept of mudstone ecological slope protection system in my country's engineering community, nor is there any related research and application, let alone a certain technical application system. Stone and soil are the most common building materials from nature, with a wide source, low cost, and natural ecology. Engineering technicians consider that stone has a certain anti-impact ability, the filling porosity is controllable, and soil is a good matrix for plant growth. If the two materials can be properly combined to give full play to their respective characteristics and advantages, an ecological slope protection structure system with anti-impact ability can be formed, which is a very meaningful new technology.

[0021] I. Main innovations

[0022] (1) Theoretical innovation: The characteristics and interactions of the debris ecological slope protection system were summarized and demonstrated from the perspectives of soil mechanics, hydraulics, structural mechanics, and botany, forming the action mechanism of the system. At the same time, the surface slope protection model in the traditional slope protection structure was improved to a three-dimensional model of "from point to surface, from surface to tree body".

[0023] (3) Structural innovation. The applicant believes that mud, stone and plants must be organically combined, interact with each other and rely on each other to form an organic whole in order to work. This is indeed the case, and its structure needs to meet certain requirements. Through prior theoretical research, design and field test verification methods, it is demonstrated how the mud and stone ecological slope protection system should be combined to work. The thickness range of the mud and stone ecological slope protection is stipulated to be 30-50cm, the weight of the single stone block must be greater than 25kg, the soil content is 40-50%, the soil requires clay (only clay can work together), the applicable water flow rate is not more than 4m / s, and the requirements for the masonry arrangement of the stone blocks are proposed. The plants mainly use herbs and small shrubs.

[0024] (4) Innovation in practice. Compared with other slope protection structures, the mudstone ecological slope protection system is a re-innovation of existing engineering technology that is simpler and more convenient. It is a re-innovation based on engineering practice and a new breakthrough in the basic theory of ecological technology. It is reflected in its simpler structure, more convenient construction, lower cost, more natural ecology and wider application range. two,

[0026] According to research and analysis, the theoretical basis of the debris ecological slope protection system is as follows:

[0027] (1) The blocks rely on their own weight to ensure their stability under water erosion. The blocks form a certain skeleton combination, which can rely on and interact with each other to further enhance their stability;

[0028] (2) Since the roughness of the stone surface is lower than that of the plant stems and leaves, after the water flows through the plant stems and leaves, the bottom flow diffuses to the stone surface to form an underflow channel, reducing the erosion of the soil surface; Figure 1 shown.

[0029] (3) The rocks limit the deformation and disturbance of the soil and prevent the soil from being lost through the compression between the rocks;

[0030] (4) Vegetation increases the roughness of the slope, increases the slope runoff resistance, and reduces the flow velocity.

[0031] (5) Herbaceous plants have many tillers and grow in clumps. Water flow is blocked and dispersed by stems and leaves in the grass, causing it to flow in a circuitous manner. The flow path increases and the hydraulic gradient decreases. The force of the water flow is dispersed and consumed in the covering leaves. The surface cover basically bears the force originally acting on the soil particles, thus weakening the erosive capacity of the runoff.

[0032] (6) The roots of herbaceous plants reinforce and anchor the soil, which strengthens the interconnection between soil particles and structures, improves the physical and mechanical properties of the soil, and thus increases the soil's ability to resist erosion.

[0033] (7) The functions of herbaceous plants in intercepting runoff, reducing raindrop splash erosion, increasing infiltration, and reducing excess seepage runoff can effectively reduce the erosion effect of heavy rain on the slope surface and play a role in protecting the slope.

[0034] 3. The main advantages of the mudstone slope protection system:

[0035] (1) Good safety and stability, and a wide range of applications. The structure with stone blocks as the skeleton and interwoven plant roots has strong anti-impact stability. Even if local vegetation or soil is damaged, large-scale damage will not occur. It is suitable for slope protection with a design flow rate of less than 4m / s.

[0036] (2) Permeable and breathable, good ecological performance. The soil-rock combined structure has good permeability and air permeability, will not block the exchange of materials and energy between the water and the shore, is conducive to building a good biological habitat environment, and meets the needs of ecological functions.

[0037] (3) Green and good landscape. Plants can easily cover the slope surface, and bank protection vegetation can play a role in slowing down the flow of water on the bank protection surface, restoring the ecology, and improving the environment and landscape.

[0038] (4) Convenient construction. The process and procedures are simple, no special equipment, personnel and technology are required, the construction is fast and convenient, and it has obvious construction advantages.

[0039] (5) Easy to obtain materials and low cost. The materials are very common and easy to obtain, which saves investment compared to most slope protection technologies and has significant economic advantages.

[0040] Based on the above-disclosed mud and rock ecological slope protection system, the applicant has made further improvements and proposed a mud and rock ecological slope protection structure with a columnar geogrid base bed of the present invention. It is a new three-dimensional ecological slope protection concept. Its core idea is to use the columnar geogrid base bed and plant roots to form a three-dimensional surface protection grid, and further improve its anti-impact ability by filling the blocks between the grids. It has obvious advantages in naturalness and economy, and the construction process is simple and convenient, and can be constructed by both machinery and manual labor.

[0041] The introduction of the mud-rock ecological slope protection structure with a columnar geogrid base will provide a new development direction for the concept of ecological slope protection technology and the construction of engineering ecological technology. At the same time, the construction process of the structure is feasible and simple, which can achieve ecological, economic and safety goals and has broad prospects for engineering application.

[0042] The innovative idea of ​​the mudstone ecological slope protection structure of the columnar geogrid base bed of the present invention is as follows:

[0043] In order for the mudstone ecological slope protection structure to play an effective role, the ratio of mud and stone blocks must meet certain requirements. According to the field test analysis and verification of the above-mentioned mudstone ecological slope protection system, the soil content is generally between 40-50% to form a good anti-scouring effect. The present invention enhances the anti-scouring performance of the soil by adding a columnar geogrid base bed in the soil, thereby increasing the spacing between the stones and further expanding the range of the soil content to 50-60%.

[0044] Innovation: Based on the mudstone ecological slope protection, the present invention combines anti-scouring with ecological functions by setting a columnar geogrid base bed, adjusting the spacing between stones, filling soil between stones that is conducive to plant growth, and planting plants in the soil. The main innovations and improvements are as follows.

[0045] (1) Appropriately increase the spacing between the stones, so that the volume of the stones reaches 40-50% of the slope protection volume, and the stones form a certain anti-scouring skeleton. The amount of stone used is reduced by 25-35% compared with conventional dry stone revetment, which can reduce the ecological damage caused by stone mining.

[0046] (2) Fill the space between the stones with soil, the volume of which should be 50-60% of the slope protection volume (i.e. the sum of the volume of the stones and the volume of the soil), to form a certain space for vegetation growth. The soil should be conducive to plant growth.

[0047] (3) A polycolumnar geogrid base bed is buried in the soil between the stones. The base bed is made of polypropylene through plasticization, extrusion, punching, and stretching, and then rolled into a cylindrical shape and connected by binding.

[0048] The columnar geogrid base bed is buried 5 to 8 cm deep. It is cylindrical in shape with a diameter of 20 cm and a column height of 20 to 30 cm. It is filled with soil inside. Its mesh structure can connect the grass roots, so that each grass unit and columnar geogrid base bed are connected to an anti-impact network through the plant roots, further enhancing the anti-impact capability.

[0049] (4) Vegetation should be mainly herbs and dwarf shrubs with well-developed root systems. They should have deep roots, good soil retention and soil fixation properties, high density, and a good greening effect. The branches and leaves should not be too developed to reduce the drag of water on the plant body.

[0050] Physical characteristics: ① It is composed of boulders, clay soil, columnar geogrid base bed and plants; ② The slope protection thickness (i.e. soil thickness) is about 40cm; ③ The soil content (referring to the volume of soil / (boulders volume + soil volume)) is 55%±5%; ④ The columnar geogrid base bed is buried between the boulders nodes with a burial depth of 5 to 8cm; ⑤ It is suitable for working conditions with a design flow velocity of ≤4m / s.

[0051] Physical parameters of columnar geogrid base bed

[0052]

[0053] Main points: To form a preliminary skeleton with stones, the stones are randomly arranged, and the pores between the stones are filled with soil (soil content is 55%±5%). The anti-impact ability of the slope protection is further enhanced by planting plants and burying columnar geogrid base beds. It can be suitable for rivers with a main channel flow rate of less than 4.0m / s during the design flood period.

[0054] The soil includes but is not limited to red soil, paddy soil, coarse bone soil, yellow soil and other clay soils with certain nutrients.

[0055] The minimum thickness of the block is not less than 20cm, the unit weight is not less than 25kg, and the bulk density of the stone is ≥25kN / m 3 , softening coefficient>0.75, saturated compressive strength≥30Mpa.

[0056] The key herbaceous plants are those with strong reproductive ability, low maintenance, well-developed root systems, and evergreen plants, including but not limited to Bermuda grass, tall fescue, Setaria, Artemisia selengensis, Goosegrass, crabgrass, barnyard grass, and silveredge grass.

[0057] Key benefits:

[0058] (1) Less amount of block stones, less impact on the environment. The blocks are randomly arranged, and the soil content between the blocks can reach 60%. The amount of block stones is small, which reduces the impact of block stone mining on the ecological environment.

[0059] (2) Close to natural structure, good ecological performance. The soil-rock combined structure has good water permeability and air permeability, will not block the exchange of materials and energy between the water and the shore, is conducive to building a good biological habitat environment, and meets the needs of ecological functions.

[0060] (3) Green and good landscape. Plants can easily cover the slope surface, and bank protection vegetation can play a role in slowing down the flow of water on the bank protection surface, restoring the ecology, and improving the environment and landscape.

[0061] (4) The construction is relatively simple and suitable for a wide variety of plants. Compared with conventional flat-laid geogrid slope protection, it is relatively easy to intersperse and arrange herbaceous and shrub plants. The construction is convenient and easy, and the plant varieties are rich.

[0062] (5) Good anti-scouring effect and low cost. The geogrid is embedded in the soil in a columnar shape, forming a soil nail-like embedding effect. The geogrid is entangled with the plant roots, and with the support of the stone skeleton, the anti-scouring ability of the slope protection is significantly improved. Due to the low cost of the geogrid, the overall cost is not high. It can be used for slope protection with a design flow rate of less than 4m / s.

[0063] Application prospects:

[0064] The application of new anti-scouring ecological revetments can give full play to the advantages of natural building materials, take into account the anti-scouring and ecological function requirements of the revetments, form a safe, reliable, ecologically friendly, and environmentally coordinated river embankment project, play an important role in the ecological construction of rivers, and provide support for the construction of ecological civilization.

[0065] The mudstone ecological slope protection structure of a columnar geogrid base bed of the present invention has been demonstrated through field experiments, and its applicable flow velocity and geometric characteristics are obtained through analysis of experimental results. The experiment set up 12 comparison groups, each with 2 sample capacities, and the experimental samples were 1.00×1.00×0.40m slope protection units. The flushing time of each group was 3 hours. (It meets the duration of most mountain floods). Among them, the local plants in Table 1 in the field experiment are Goosegrass (or Echinochloa crus-galli and Ophiopogon japonicus can also be selected), and the soil is yellow soil. The experimental grouping is shown in Table 1 below:

[0066] Table 1 Experimental grouping of the new ecological slope protection group of the present invention and the comparison group

[0067]

[0068] The experiment introduces the concept of impact loss rate. According to the characteristics of the experimental samples and the actual situation, the impact loss rate calculation formula is designed as follows:

[0069]

[0070] Where: p—impact loss rate, %;

[0071] S—covering area of ​​topsoil thickness ≥5cm within the sampling range, cm 2 ;

[0072] ∑S 10≥h≥5 — Area of ​​hollowing out within the sampling range with a thickness of 10 ≥ h ≥ 5 cm, cm 2 ;

[0073] ∑S h≥10 —Hollowout thickness h≥10cm area within the sampling range, cm 2 .

[0074] When p≥30, it is considered that obvious scour damage occurs.

[0075] The experimental results are shown in Table 2 below:

[0076] Table 2 Statistics of impact loss rate

[0077]

[0078] The technical feature "center distance of columnar geogrid base bed" in Tables 1 and 2 refers to the distance between the centers of two adjacent columnar geogrid base beds.

[0079] It can be seen from Table 2 that when the river flow velocity is 3m / s and the soil content is 50-60%, the erosion rate is the smallest. Even if the soil content is increased to 100%, the erosion rate is less than 30% when the columnar geogrid base bed is not buried. This shows that in the mud-rock slope protection structure of the present invention, the soil content has little effect on the erosion rate in the low-velocity river.

[0080] In a river channel with a flow rate of 4 m / s, when the soil content of the mud-rock slope protection structure of the present invention is 50% and 58%, the erosion rate is less than 30%, and when it is less than 50% and greater than 60%, the erosion rate is greater than 30%, indicating that the soil content of the mud-rock slope protection structure of the present invention is limited between 50-60%, which can achieve a better slope protection effect.

[0081] When the mudstone slope protection structure of the present invention is applied to a river with a flow rate of 5 m / s, even if the soil content is between 50-60%, the erosion rate is greater than 30%, indicating that the mudstone slope protection structure of the present invention can only be applied to a river with a flow rate of ≤4 m / s.

[0082] In addition, it can be seen from Table 2 that when the mudstone slope protection structure of the present invention is applied to a river with a low flow rate, such as a river with a flow rate of 3m / s, the size of the center distance of the columnar geogrid base bed has little effect on the erosion rate, and a good slope protection effect can be achieved when the base bed center distance is within the range of 30-70cm. When the mudstone slope protection structure of the present invention is applied to a river with a flow rate of 4m / s, a good slope protection effect can be achieved when the center distance of the columnar geogrid base bed is limited to 30-50cm, especially when the base bed center distance is limited to 50cm, the slope protection structure of the present invention is applied to a river with a flow rate of 4m / s, and the slope protection effect is the best. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] Figure 1 is a schematic diagram of the structure of the debris slope protection system serving as the basis for the improvement of the present invention,

[0084] Figure 2 The schematic diagram of the mudstone ecological slope protection structure of the columnar geogrid base bed of the present invention is Figure 1 ,

[0085] Figure 3 The schematic diagram of the mudstone ecological slope protection structure of the columnar geogrid base bed of the present invention is Figure 2 ,

[0086] Figure 4 It is a structural schematic diagram of the invented columnar geogrid base bed. DETAILED DESCRIPTION

[0087] A mudstone ecological slope protection structure with a columnar geogrid base bed is used for rivers with a flow rate of less than 4.0 m / s, comprising a layer of block stones laid at intervals on the river slope, the gaps between the blocks of stones are filled with soil, a columnar geogrid base bed is buried in the soil, and plants are planted in the soil, wherein the columnar geogrid base bed is buried at intervals of 30-50 cm, the soil content is 50-60%; the volume of the block stones is 40-50% of the slope protection volume; the soil thickness of the river slope is 35-45 cm, and the average thickness is 40 cm.

[0088] The columnar geogrid base bed has a diameter of 20 cm and a height of 20-30 cm; the top of the columnar geogrid base bed is 5-8 cm away from the soil surface. The columnar geogrid base bed is formed by rolling the geogrid into a cylindrical shape and then fixing it.

[0089] The selection of the columnar geogrid base bed needs to meet the following conditions: longitudinal / transverse tensile strength ≥15.0KN / m, longitudinal / transverse tensile strength at 2% elongation ≥5.0KN / m, longitudinal / transverse tensile strength at 5% elongation ≥7.0KN / m, longitudinal / transverse 5% elongation ≤15.0 / 13.0.

[0090] The minimum thickness of the block is not less than 20cm, the unit weight is not less than 25kg, and the bulk density of the stone is ≥25kN / m 3 , softening coefficient>0.75, saturated compressive strength≥30Mpa.

[0091] The soil includes but is not limited to red soil, paddy soil, coarse bone soil or yellow soil with certain nutrients. The plants are herbaceous plants, such as bermudagrass, tall fescue, foxtail grass, sedge grass, goosegrass, crabgrass, barnyard grass, and silver edge grass.

Claims

1. A mudstone ecological slope protection structure with a columnar geogrid base bed, used for a river with a flow rate of ≤4.0m / s, comprising a layer of blocks of stone laid at intervals on the river slope, soil filled between the blocks of stone, and a columnar geogrid base bed buried in the soil, and herbaceous plants planted in the soil, wherein: The soil content is 50-60%; the columnar geogrid base is buried at a spacing of 30-50cm; the soil thickness on the river slope is 35-45cm; the top of the columnar geogrid base is 5-8cm away from the soil surface; the columnar geogrid base is formed by rolling the geogrid into a cylindrical shape and then fixing it; the columnar geogrid base has a diameter of 20cm and a height of 20-30cm; the volume of the block stone is 40-50% of the slope protection volume; the selection of the columnar geogrid base The following conditions must be met: longitudinal / transverse tensile strength ≥15.0KN / m, tensile strength at 2% longitudinal / transverse elongation ≥5.0KN / m, tensile strength at 5% longitudinal / transverse elongation ≥7.0KN / m, longitudinal / transverse 5% elongation ≤15.0 / 13.0; the minimum thickness of the block stone is not less than 20cm, the unit weight is not less than 25kg, the stone bulk density is ≥25kN / m³, the softening coefficient is greater than 0.75, the saturated compressive strength is ≥30Mpa, and the exposed surface of the block stone along the slope is basically flat.

2. The mudstone ecological slope protection structure with a columnar geogrid base bed according to claim 1 is characterized by: The soil thickness on the river slope is 40cm.

3. The mudstone ecological slope protection structure with a columnar geogrid base bed according to claim 1 or 2, characterized in that: The soil is red soil, paddy soil, coarse bone soil or yellow soil.

4. The mudstone ecological slope protection structure with a columnar geogrid base bed according to claim 1 or 2, characterized in that: The herbaceous plants are bermudagrass, tall fescue, foxtail grass, sedge grass, goosegrass, crabgrass, barnyard grass, and silvergrass.

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