Recycled aggregate ecological concrete slope protection structure based on capillary retardation

Abstract

The utility model provides a recycled aggregate ecological concrete slope protection structure based on capillary retardation. The recycled aggregate ecological concrete slope protection structure comprises a slope soil body, and an impermeable layer, a recycled aggregate ecological concrete layer, a root growth layer, a plant-growing concrete layer and a planting soil layer which are sequentially laid on an original soil surface layer of the slope soil body from bottom to top, the recycled aggregate ecological concrete layer comprises recycled aggregate ecological concrete and nutritional geotechnical cloth laid on the recycled aggregate ecological concrete, communicated macropores are formed in the recycled aggregate ecological concrete layer and the vegetation type concrete layer, and the PH value of the vegetation type concrete layer is 8-10. According to the structure, the slope body is communicated with the atmospheric environment through reasonable matching of the structures of all the layers, a good living space is provided for plants and microorganism environments, water and soil loss on the surface of the slope body can be effectively resisted while low-carbon circulation is achieved, and sustainability of slope ecology is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of ecological slope protection, in particular to a capillary-blocking-based recycled aggregate ecological concrete slope protection structure. Background Art

[0002] The current mainstream plant slope protection includes artificial grass slope protection, hydraulic spraying grass slope protection, flat turf slope protection, geonet pad soil planting plant slope protection, etc., which have high requirements for slope stability and slope scour, and are very likely to cause soil erosion due to heavy rainfall, thus forming a deformed vegetation slope pattern with dry top and dense foot. Therefore, there is an urgent need for a semi-rigid and semi-flexible slope protection structure, which can not only ensure the normal growth of vegetation so that the slope can have friendly material and energy interaction with the outside atmosphere, but also ensure that the slope surface will not cause excessive soil erosion due to heavy rainfall. Utility Model Content

[0003] In view of the problems existing in the above-mentioned prior art, the utility model provides a recycled aggregate ecological concrete slope protection structure based on capillary barrier, the purpose of which is to combine ecological concrete with the slope protection structure to form a semi-rigid and semi-flexible slope protection structure with convenient construction, clear and reasonable structure, which can not only promote the ecological restoration of the slope and strengthen the soil, but also the vegetation concrete can slow down the erosion of rainwater, greatly improve the survival rate of vegetation and reduce soil loss on the slope, so as to realize the sustainable interaction between the slope and the atmospheric environment.

[0004] In order to achieve the above purpose, the specific scheme of the utility model is as follows:

[0005] The capillary-blocking recycled aggregate eco-concrete slope protection structure comprises a slope soil body, an anti-seepage layer laid on the original soil surface of the slope soil body from bottom to top, a recycled aggregate eco-concrete layer, a root growth layer, a vegetation concrete layer and a planting soil layer. The recycled aggregate eco-concrete layer comprises porous recycled aggregate eco-concrete and a nutrient geotextile laid on the porous recycled aggregate eco-concrete. Both the recycled aggregate eco-concrete layer and the vegetation concrete layer contain interconnected macropores, and the pH value of the vegetation concrete layer is 8-10.

[0006] Furthermore, the slope soil is in a slope shape, a concrete cap is provided on the top of the slope soil, and a horseway is provided at the bottom of the slope soil, or the slope soil is in a stepped shape, a concrete cap is provided on the top of the slope soil, and horseways are respectively provided between the bottom of the slope soil and each level of the steps, a drainage ditch is provided in the horseway, and a drainage outlet connected to the recycled aggregate ecological concrete layer is provided on the drainage ditch.

[0007] Furthermore, the anti-seepage layer is composed of a waterproof coating and a compacted clay layer superimposed on each other. The thickness of the waterproof coating is 2 mm. The waterproof coating is located on the surface of the original slope. The thickness of the compacted clay layer is 50 mm, and the compaction degree is ≥ 90%. The porous recycled aggregate ecological concrete is laid on the compacted clay layer, and the nutritional geotextile is composed of animal felt.

[0008] Furthermore, the porous recycled aggregate ecological concrete is made by mixing cement, recycled aggregate, mineral admixture, water and water reducer, the vegetation concrete layer is made by mixing recycled aggregate, cement, mineral admixture, water and water reducer, the root growth layer is made by mixing cultivated soil, starch grafted water retaining agent, biochar and long-acting slow-release fertilizer, and the cultivated soil is fine-grained soil.

[0009] Furthermore, the porosity of the recycled aggregate ecological concrete layer is 15-20%, and the porosity of the bioreinforced concrete layer is 25-30%.

[0010] Furthermore, the root growth layer includes planting soil, which is a mixture of cultivated soil, starch-grafted water-retaining agent, biochar and long-acting slow-release fertilizer; the planting layer includes planting soil and plant seeds, which is a mixture of cultivated soil and long-acting slow-release fertilizer, and the plant seeds are composed of one or more of tall fescue, bermudagrass, ryegrass and white clover seeds, and the planting soil is filled in the large pores of the vegetation concrete layer.

[0011] Furthermore, the recycled aggregate ecological concrete layer is 150-250 mm thick, the root growth layer is 100-200 mm thick, the vegetation concrete layer is 50-80 mm thick, and the planting layer is 30-60 mm thick.

[0012] Advantages of the utility model

[0013] 1. The utility model is a capillary-blocking-based recycled aggregate eco-concrete slope protection structure. Recycled aggregate is applied to the slope protection structure to prepare a porous recycled aggregate eco-concrete layer and a vegetation concrete layer. The capillary blockage effect generated by the difference in permeability coefficients between the vegetation concrete layer, the root growth layer and the recycled aggregate eco-concrete layer is used to store rainwater that infiltrates into the slope in the root growth layer, which not only provides continuous moisture for plant growth, but also effectively slows down the sudden drop in water content caused by the transpiration of the stems and leaves of vegetation. The transpiration of the stems and leaves of vegetation can keep the root area at a high suction, thereby reducing the permeability coefficient of the area. When the slope protection structure encounters long-duration rainfall or extreme rainstorms, even when the interface matrix suction between the root growth layer and the recycled aggregate eco-concrete layer reaches the water inlet value of the recycled aggregate eco-concrete layer, making the capillary blockage effect ineffective, the excess water can still be discharged out of the slope through the recycled aggregate eco-concrete layer. The anti-seepage layer can further block the vertical infiltration of water in the recycled aggregate eco-concrete layer, thereby significantly reducing the adverse effects of rainfall on the strength degradation and stability of the soil in the slope. This slope protection structure not only uses the capillary retardation effect to achieve dynamic regulation of water in the slope, builds a nutrient and humid environment that meets the needs of plant growth, hinders and delays the impact of rainfall infiltration on slope stability, but also effectively resists the hydraulic erosion of surface runoff, alleviates soil erosion, and provides scientific guarantees for the long-term resilience of slope protection projects.

[0014] 2. The slope protection structure of the utility model applies recycled aggregate to the slope protection structure. Through the reasonable coordination and application of each layer structure, the slope is connected with the atmospheric environment, providing a good living space for plants and microorganisms, and can effectively resist soil erosion on the slope surface while achieving a low-carbon cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an overall schematic diagram of the slope-shaped slope protection structure of the utility model.

[0016] Figure 2 It is a schematic side view of the overall stepped slope structure of the utility model.

[0017] Figure 3 for Figure 1 and Figure 2 A is an enlarged schematic diagram of the local structure.

[0018] In the figure:

[0019] 1: Slope soil; 2: Concrete capping; 3: Planting soil layer; 4: Vegetation concrete layer; 5: Root growth layer; 6: Recycled aggregate ecological concrete layer; 7: Anti-seepage layer; 8: Plant seeds; 9: Intercepting ditch; 10: Horse path; 11: Nutrient geotextile; 12: Drainage outlet. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the utility model more clear, the utility model is further explained below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that this specific embodiment is not used to limit the scope of rights of the utility model.

[0021] like Figures 1 to 3 As shown, this specific embodiment provides a capillary barrier-based recycled aggregate eco-concrete slope protection structure that can be applied to river banks, slopes, etc., and realizes environmental greening and soil layer protection. The capillary barrier-based recycled aggregate eco-concrete slope protection structure includes a slope soil body 1, an anti-seepage layer 7 laid on the original soil surface of the slope soil body 1 from bottom to top, a recycled aggregate eco-concrete layer 6, a root growth layer 5, a vegetation concrete layer 4, and a planting soil layer 3.

[0022] The slope protection structure includes a slope soil body 1, the slope soil body 1 is in a slope shape, and a horseway 10 is arranged at the bottom of the slope soil body 1, or the slope soil body 1 is in a stepped shape, and a horseway 10 is arranged between the bottom of the slope soil body 1 and each level of the steps, and a drainage ditch 9 is arranged in the horseway 10 to intercept the water flow on the top of the slope soil body 1 and on the slope, and reduce the scouring and erosion of the slope surface by the water flow. The drainage outlet 12 of the drainage ditch 9 is connected to the recycled aggregate ecological concrete layer 6 to play a drainage role. The function of the drainage ditch 9 is to intercept the water flow on the top of the slope soil body 1 and on the slope, and reduce the scouring and erosion of the slope surface by the water flow. The slope protection structure can be used in combination with a frame lattice and anchor rods according to the actual project.

[0023] The anti-seepage layer 7 is composed of a waterproof coating with a thickness of 2 mm and a compacted clay layer with a thickness of 50 mm. The waterproof coating is a waterproof coating, and the compaction degree of the compacted clay layer is ≥90%. The anti-seepage layer 7 can effectively prevent vertical infiltration of rainfall and avoid damage to the slope body 1 caused by water in the soil. The compacted clay layer mainly plays the role of protecting the anti-seepage coating, which can effectively prevent the coating from being penetrated due to the pouring of recycled aggregate ecological concrete in the early stage of the structure, and then losing its anti-seepage function.

[0024] The recycled aggregate ecological concrete layer 6 includes porous recycled aggregate ecological concrete and a nutrient geotextile laid on the porous recycled aggregate ecological concrete. The recycled aggregate ecological concrete is made of cement, recycled aggregate, mineral admixture, water, water reducing agent and other materials. The recycled aggregate ecological concrete layer 6 has interconnected macropores, which can regulate the moisture of the slope soil structure, and can timely drain the excess moisture brought by the rainstorm out of the slope to avoid damage to the slope caused by the rainstorm. The porosity of the recycled aggregate ecological concrete layer 6 is 15-20%, which avoids excessive accumulation of moisture. The porous recycled aggregate ecological concrete is laid on the compacted clay layer. The role of the compacted clay layer is to effectively protect the waterproof coating from being penetrated by the recycled aggregate, thereby losing its anti-seepage properties. The recycled aggregate ecological concrete layer mainly plays a drainage role. By connecting to the drain port 12 on the intercepting ditch 9, the water is discharged into the intercepting ditch 9 by gravity to avoid endangering the structural stability of the slope soil 1.

[0025] A layer of nutrient geotextile 11 is laid on the porous recycled aggregate eco-concrete, and the nutrient geotextile 11 is composed of animal felt. The nutrient geotextile 11 has a reverse filtration effect, which can effectively prevent the soil particles in the initial root growth layer of the structure from falling into the recycled aggregate eco-concrete layer 6, thereby causing the loss of soil particles and pore blockage. The nutrient geotextile 11 can be degraded by microorganisms in the later stage to provide the required nutrients for plant growth. The recycled aggregate concrete layer 6 can play a mechanical role, has good mechanical properties, and plays a reinforcing role on the ecological slope.

[0026] The root growth layer 5 includes planting soil, which is made by mixing cultivated soil, starch grafted water retaining agent, long-term slow-release fertilizer, biochar and other materials, and the cultivated soil is fine-grained soil. The root growth layer regulates the moisture of the slope structure through the capillary retardation effect generated by the difference in permeability coefficients between the vegetation concrete layer, the root growth layer, and the macroporous ecological concrete layer, and stores the moisture brought by rainfall in the root growth layer to ensure that the moisture conditions required for the long-term growth of plants are met. Starch grafted water retaining agent is used to ensure its initial water holding capacity and later nutritional capacity, and retains moisture through the capillary retardation principle. It can be degraded by microorganisms in the later stage to provide nutrition. When the root soil aggregate is formed and has a certain water locking capacity, the starch grafted water retaining agent can be gradually degraded by microorganisms to further provide nutrients for the growth of plants. The biochar and long-term slow-release fertilizer provide necessary nutrients for the growth of plants and microorganisms. The root growth layer 5 contains interconnected small pores, which can produce capillary action. When rainfall enters the large pores of the recycled aggregate eco-concrete layer 6 from the small pores of the root growth layer 5, it will be stored in the root growth layer due to the capillary retardation effect caused by the difference in permeability coefficient. The rainfall exceeding the storage amount will be discharged from the slope structure by the recycled aggregate eco-concrete layer 6, thereby playing the role of automatically regulating the moisture of the slope. The moisture in the root growth layer 3 can penetrate upward to provide the upper vegetation concrete layer 4 and planting layer 3 with the moisture required for plant growth. It has the dual properties of vegetation and water retention, and can reduce the number of watering in the later stage.

[0027] The vegetation concrete layer 4 is made of a mixture of cement, recycled aggregate, mineral admixtures, water and water reducing agent, and the mineral admixtures include fly ash and silica fume. The vegetation concrete layer 4 contains interconnected macropores, which can provide space for the growth of vegetation roots. The porosity of the vegetation concrete layer is 25-30%, and the pH value of the vegetation concrete layer 4 is 8-10. The vegetation concrete layer 4 can not only resist the erosion of rainfall and surface runoff, but also provide sufficient space for the growth of plant roots. DPS agent or superphosphate is used to reduce the alkalinity of the vegetation concrete layer to reach a pH value of 8-10, so that the plant seeds 8 can grow smoothly and allow the roots to pass through the vegetation concrete layer 4 to reach the root growth layer 5. Under the action of the plant roots, the vegetation concrete layer 4 forms a whole with the root growth layer 5 below, which can further maintain the stability of the structure.

[0028] The planting layer 3 is composed of planting soil and plant seeds, and the planting soil is formed by mixing cultivated soil and long-acting slow-release fertilizer. The plant seeds 8 are composed of one or more of tall fescue, bermudagrass, ryegrass, and white clover seeds. A layer of nutrient geotextile 11 is laid on the surface of the planting layer. The nutrient geotextile 11 is a non-woven fabric to play the role of anti-rain erosion, moisture retention, heat preservation, water retention, and reducing ultraviolet direct exposure, thereby improving the seed germination rate and vegetation survival rate.

[0029] The recycled aggregate ecological concrete layer is 150-250 mm thick, the root growth layer is 100-200 mm thick, the vegetation concrete layer is 50-80 mm thick, and the planting layer is 30-60 mm thick.

Claims

1. The recycled aggregate ecological concrete slope protection structure based on capillary retardation is characterized by: It includes a slope soil body, an anti-seepage layer laid on the original soil surface of the slope soil body from bottom to top, a recycled aggregate ecological concrete layer, a root growth layer, a vegetation concrete layer and a planting soil layer. The recycled aggregate ecological concrete layer includes porous recycled aggregate ecological concrete and a nutrient geotextile laid on the porous recycled aggregate ecological concrete. The recycled aggregate ecological concrete layer and the vegetation concrete layer both contain interconnected large pores, and the pH value of the vegetation concrete layer is 8-10.

2. The capillary retardation-based recycled aggregate ecological concrete slope protection structure according to claim 1 is characterized in that: The slope soil body is in a slope shape, with a concrete capping provided on the top of the slope soil body and a horseway provided at the bottom of the slope soil body, or the slope soil body is in a stepped shape, with a concrete capping provided on the top of the slope soil body, horseways provided between the bottom of the slope soil body and each level of the steps, a drainage ditch provided in the horseway, and a drainage outlet provided on the drainage ditch which is connected to the recycled aggregate ecological concrete layer.

3. The capillary retardation-based recycled aggregate ecological concrete slope protection structure according to claim 1 is characterized in that: The anti-seepage layer is composed of a waterproof coating and a compacted clay layer superimposed on each other. The waterproof coating is 2 mm thick and is located on the surface of the original slope. The compacted clay layer is 50 mm thick and has a compaction degree of ≥90%. The porous recycled aggregate ecological concrete is laid on the compacted clay layer, and the nutrient geotextile is composed of animal felt.

4. The capillary retardation-based recycled aggregate ecological concrete slope protection structure according to claim 1, characterized in that: The porosity of the recycled aggregate ecological concrete layer is 15-20%, and the porosity of the biomass concrete layer is 25-30%.

5. The capillary retardation-based recycled aggregate ecological concrete slope protection structure according to claim 1, characterized in that: The recycled aggregate ecological concrete layer is 150-250 mm thick, the root growth layer is 100-200 mm thick, the vegetation concrete layer is 50-80 mm thick, and the planting layer is 30-60 mm thick.

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