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CN-121970568-A - High steep slope Jiang Dongrong-resistant plant growth block, green low-temperature freezing preparation method and application

CN121970568ACN 121970568 ACN121970568 ACN 121970568ACN-121970568-A

Abstract

The invention discloses a high steep slope Jiang Dongrong-resistant plant block, a green low-temperature freezing preparation method and application thereof, and aims to solve the core technical problems of easily instable structure, difficult water and fertilizer maintenance, poor vegetation adaptability and inconvenient construction of ecological restoration materials. The method comprises the steps of uniformly mixing soil, organic matters, a water retaining agent, hydrothermal carbon and a slow release fertilizer to obtain a matrix, then adding fibers into the matrix to dry-mix the matrix to construct a three-dimensional reinforced skeleton, then adding cementing agents into the matrix to stir the matrix to prepare a fluid mixture, paving the matrix in a mould by adopting a layered structure, uniformly broadcasting proper plant seeds on the surface layer to prepare a green plant block blank of the embedded seeds, and shaping the green plant block blank into a block body which is stable in structure, capable of being carried and assembled and internally provided with a porous skeleton structure through low-temperature freezing treatment, demoulding and air drying treatment. The plant growth block has mechanical stability, excellent freeze thawing resistance and ecological functionality, and is especially suitable for rapid ecological restoration of steep slopes in ecologically fragile environments such as Qinghai-Tibet plateau, northwest cold and arid regions.

Inventors

  • PEI XIANGJUN
  • ZHANG XIAOCHAO
  • LUO XIN
  • ZHANG HANXUE
  • CHEN JIAQI

Assignees

  • 成都理工大学

Dates

Publication Date
20260505
Application Date
20260409

Claims (10)

  1. 1. The green low-temperature freezing preparation method of the high-steep slope Jiang Dongrong plant-growing blocks is characterized by comprising the following steps of: Step 1, preparing a matrix; Uniformly mixing soil, organic matters, a water-retaining agent, hydrothermal carbon and a slow release fertilizer to obtain a matrix; Step2, constructing a three-dimensional reinforced skeleton; Adding fibers into a matrix, dry-mixing, and dispersing the fibers into the matrix to obtain a three-dimensional reinforced skeleton; Step 3, cementing and molding; Adding a high polymer cementing agent with freeze-thawing reinforcing performance into the three-dimensional reinforced skeleton, and stirring to obtain a fluid mixture; Step 4, layering and molding; firstly paving a layer of laminar mixture in a mould, compacting, paving an embedded reinforcement layer, finally filling the laminar mixture, compacting and leveling to obtain a plant-growing block with a sandwich structure; Step 5, pre-burying and primarily solidifying seeds; broadcasting and embedding plant seeds on the surface of the plant-growing block to obtain a plant-growing block embedded with the plant seeds; Step 6, freezing at low temperature; Freezing plant blocks pre-embedded with plant seeds at low temperature, wherein free water in the plant blocks generates ice crystals in the freezing process, and the polymer cementing agent with freeze-thawing strengthening performance forms a film; Step 7, demolding and solidifying; Demoulding the frozen plant-growing block, taking out, air drying, melting ice crystal into free water and evaporating during air drying, continuously solidifying the polymer cementing agent with freeze-thawing strengthening property into film, and finally obtaining the plant-growing block with porous skeleton structure.
  2. 2. The green low-temperature freezing preparation method of the high and steep slope Jiang Dongrong plant-growing blocks according to claim 1 is characterized in that in the matrix of the step 1, the raw material components are as follows by weight percent: 58-68% of soil, 30-40% of organic matters, 0.5-1.5% of water-retaining agent, 0.5-1.5% of hydrothermal carbon and 0.5-1.5% of slow release fertilizer.
  3. 3. The green low-temperature freezing preparation method of the high and steep slope Jiang Dongrong plant-growing block according to claim 1, wherein in the step 2, when fibers are added into a matrix, the weight of the fibers is 4-20% of the weight of the matrix.
  4. 4. The method for preparing the green low-temperature frozen high-steep slope Jiang Dongrong plant-growing blocks according to claim 1, wherein in the step 3, the polymer cementing agent with freeze-thawing reinforcing performance is one or a combination of at least two of polyvinylpyrrolidone aqueous solution, polyethylene glycol aqueous solution, polyvinyl alcohol aqueous solution and polyethylene oxide aqueous solution.
  5. 5. The method for preparing the green low-temperature freezing-resistant Jiang Dongrong plant-growing blocks of the steep slope according to claim 1, wherein in the step 3, the weight of the high-molecular cementing agent with the freeze-thawing reinforcing performance is 40-80% of the weight of the three-dimensional reinforced skeleton, and the concentration of the high-molecular cementing agent with the freeze-thawing reinforcing performance is 5-8%.
  6. 6. The green low-temperature freezing preparation method of the high and steep slope Jiang Dongrong-resistant plant blocks according to claim 1 is characterized in that in the step 5, when plant seeds are sown on the surface of the plant blocks, the sowing amount of the plant seeds is 20-40 g/m 2 .
  7. 7. The green low-temperature freezing preparation method of the plant blocks with the steep slope Jiang Dongrong resistance according to claim 1 is characterized in that in the step 6, the low-temperature freezing treatment method is that the plant blocks with the plant seeds embedded therein are placed in an environment of-30 ℃ to-20 ℃ and frozen for 24-36 hours.
  8. 8. The green low-temperature freezing preparation method of the high and steep slope Jiang Dongrong-resistant plant blocks according to claim 1 is characterized in that in the step 7, the plant blocks taken out of the demoulding are naturally air-dried for 20-24 h under the normal temperature condition.
  9. 9. A high steep slope resistant Jiang Dongrong plant block prepared by the green low temperature freezing method for preparing a high steep slope resistant Jiang Dongrong plant block according to any one of claims 1-8.
  10. 10. The use of the high and steep slope Jiang Dongrong vegetation blocks of claim 9 for revegetation and protection of steep slopes or rocky retaining walls.

Description

High steep slope Jiang Dongrong-resistant plant growth block, green low-temperature freezing preparation method and application Technical Field The invention belongs to the technical field of ecological restoration and soil and water conservation, relates to a plant block used in the prevention and treatment of water and soil loss and vegetation restoration and protection of a high-cold high-altitude steep slope, and particularly relates to a Jiang Dongrong plant block with high-steep slope resistance, a green low-temperature freezing preparation method and application. Background With the continuous promotion of mountain area traffic infrastructure construction, town expansion and energy mineral development, a large amount of steep slopes are cut and excavated to form exposed slopes with the gradient exceeding 70 degrees. Under the superposition of freeze thawing and water erosion, slope surface erosion, ditch erosion and chipping are extremely easy to occur, and road safety and regional ecological stability are seriously affected. The development of plant restoration on high and steep slopes in cold areas is a long-term engineering problem, and the material is required to have light weight, multiple holes, good vegetation adaptability and sufficient structural stability. The artificial planting technology with the widest application at the present stage mainly comprises soil-outside spray seeding, mixed planting, planting blanket, geotextile covering and the like. The soil-covering spraying and mixing plant growth is characterized in that the soil-covering material, the water-retaining material, the seeds and the adhesive are mixed and then integrally sprayed on the surface layer of the slope body, the soil-covering spraying and mixing plant growth is suitable for medium-low slope and can form vegetation coverage in a short time, and the plant-covering blanket, geotextile and other covering materials are paved on the slope surface by means of fiber frameworks, a small amount of matrixes and plant seeds to provide basic water-retaining and soil-retaining functions for plants, and are commonly used in gentle slopes or medium-slope areas. However, the above technique is poorly applicable on high steep slopes. Taking spray seeding technology as an example, the mixed base material is extremely easy to integrally slide along with gravity under the condition that the gradient is larger than 60 degrees, and the base material is softened and washed out by runoff after rainfall, so that the base material is lost, seeds are sowed and exposed, and the re-erosion risk is increased. In addition, the spray-seeding material is usually thin-layer adhesion, and when the high-steep rock wall lacks enough roughness, the adhesion of the base material is obviously reduced, repeated construction is often needed, the cost is increased, and the effect is unstable. Related researches show that on the surface of high and steep bare rock, the spray-seeding technology is difficult to maintain the activity of more than or equal to 70% for a long time, and the seed hanging rate is generally low. Although the vegetation blanket and geotextile have certain erosion resistance, the base material of the vegetation blanket and geotextile is thin, the water storage capacity is limited, and the humidity is maintained mainly by rainfall or exogenous irrigation. The vegetation root system is difficult to penetrate through the thin-layer substrate and enter the deep soil body, so that the survival rate of plants is low and the stress resistance is weak, and meanwhile, the vegetation blanket paved on the high-steep slope surface is easy to curl or misplace under the action of gravity, and the situation of curling and tearing after runoff is common. Therefore, it is difficult for such materials to provide a long-term, stable ecological restoration effect for high steep slopes. In recent years, in order to improve the surface stability of steep rock slopes, a "soil-cement-plant" composite system such as vegetation concrete and polyurethane composite base materials is gradually used for bare rock slopes or thin-covered soil slopes. The technology obviously improves the anti-scouring and shearing strength by combining cementing materials such as cement, polyurethane and the like with soil bodies, and can inhibit the slip of foreign soil and the scouring of surface layers to a certain extent. The vegetation concrete is easy to crack, strength is attenuated and the like under the action of freeze thawing circulation, and meanwhile, the higher cement consumption and compact structure are not beneficial to root penetration and soil microorganism activity, so that the long-term ecological restoration effect is limited. For high and steep slopes in cold and high altitude areas, the problem of obvious freeze thawing erosion is also superposed. The freeze thawing cycle can cause the volume expansion and the structural damage of the soil-rock medium on the sur