Soil layer structure for restoring barren soil

Abstract

The utility model relates to the technical field of barren soil remediation, and discloses a soil layer structure for barren soil remediation, which is laid at the top of a barren soil layer and sequentially comprises a low gel solidification layer, a first soil filling layer, a second soil filling layer and an ECM (extracellular matrix) anti-erosion fiber protection layer from the barren soil layer to the top, a polypropylene anti-loosening plate is further arranged between the first soil filling layer and the second soil filling layer; through the low gel solidification layer, the first soil filling layer, the anti-loosening plate, the second soil filling layer and the ECM anti-erosion fiber protection layer, the barren soil is rapidly repaired, the barren soil repairing cost is reduced, the barren soil repairing procedure is simple, and the barren soil repairing efficiency is improved; the method has the advantages of being low in soil remediation cost, simple in procedure, environmentally friendly and the like, and the problems that existing soil remediation cost is too high, green and environmentally friendly cannot be achieved, and the procedure is tedious are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of barren soil restoration, and in particular relates to a soil layer structure used for barren soil restoration. Background Art

[0002] Soil impoverishment is also called soil degradation. It is a comprehensive representation of the deterioration of soil environment and soil physical, chemical and biological properties, such as decreased organic matter content, nutrient deficiency, soil structure destruction, soil erosion, thinning of soil layers, soil compaction, soil acidification, alkalization and sandification. Among these characteristics, the decrease in organic matter content can be used as an important sign of soil degradation, which is related to many properties of soil. Therefore, in order to ensure the content of soil organic matter and fertility, it is necessary to repair the soil layer structure and improve the regional ecology and living environment. In recent years, in the field of geotechnical and resource and environmental engineering, the use of microbial induced carbonate precipitation (MICP) technology to improve soil physics (such as reducing permeability), mechanics (such as increasing strength) and chemical properties (fixing heavy metals and harmful elements) has become a research hotspot. In addition, this technology has also been used to mitigate water / wind erosion of soil (i.e., preventing wind and sand and reducing soil erosion), remove harmful element pollution in water bodies, protect and mitigate weathering erosion on building surfaces, and repair rock and soil cracks. This MICP technology is more environmentally friendly and has the potential to replace traditional grouting technology. In addition, in foundation reinforcement, underground space backfill and other foundation projects, well-quality fill soil and concrete are often used as raw materials. These traditional practices are costly and complex. At the same time, the large amount of waste soil and waste mud generated during the foundation construction process needs to be transported and disposed of, which is time-consuming, labor-intensive and costly. If the waste soil and waste mud can be recycled and used in foundation reinforcement, underground space backfill and other projects, achieving a "balance between excavation and filling" will not only be green and environmentally friendly, but also save costs.

[0003] Therefore, the development of new, efficient and environmentally friendly cementitious solidification materials based on solid waste raw materials and bioreinforcement technology based on the principle of microbial mineralization have significant effects in saving materials, energy and costs, and reducing carbon emissions, so as to achieve the resource effect of using science and technology to reduce the basic project. After searching, a water-retaining and fertilizer-retaining composite soil structure for tropical barren soil lawn planting is disclosed in the utility model patent with the authorization announcement number CN212414112U. The soil structure realizes the repair of barren soil by sequentially pressing a blown sand bottom layer, a salt-pressed mud layer, a leached soil layer, a sawdust cushion layer and a composite improved soil layer on the soil layer, thereby ensuring the water and fertilizer conservation of the soil; however, it is obvious that the soil structure does not realize the application of waste slag and waste mud generated during the foundation construction process in the repair of soil barrenness, and cannot achieve green environmental protection and the repair cost is high; at the same time, the above-mentioned soil structure sequentially presses a blown sand bottom layer, a salt-pressed mud layer, a leached soil layer, a sawdust cushion layer and a composite improved soil layer, resulting in excessively high soil repair costs and cumbersome procedures.

[0004] Therefore, the utility model proposes a soil layer structure for repairing barren soil to solve the problems existing in the above-mentioned prior art. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the shortcomings of the existing technology, the utility model provides a soil layer structure for repairing barren soil, which has the advantages of low soil repair cost, simple process and green environmental protection. It solves the problems of existing soil repair that the cost is too high, green and environmental protection cannot be achieved, and the process is relatively cumbersome.

[0007] (II) Technical solution

[0008] In order to achieve the above-mentioned purpose of low-cost soil repair, green environmental protection and simple process, the utility model provides the following technical solutions:

[0009] A soil layer structure for barren soil restoration, which is laid on the top of the barren soil layer and comprises, from the barren soil layer upward, a low gel solidification layer, a first fill layer, a second fill layer and an ECM anti-erosion fiber protection layer, and a polypropylene anti-loosening plate is also arranged between the first fill layer and the second fill layer;

[0010] Based on the above technical features: through the low-gel solidification layer, the first fill layer, the anti-loosening board, the second fill layer and the ECM anti-erosion fiber protection layer, the rapid repair of barren soil is achieved, the cost of repairing barren soil is reduced, the process of repairing barren soil is simple, and the efficiency of repairing barren soil is improved; through the first through hole, the second through hole and the reinforcement rod, the first fill layer and the second fill layer are reinforced, thereby increasing the stability of the soil structure and preventing the soil from sliding; the problem of high cost and complicated process of existing soil repair is solved.

[0011] As a preferred solution of the soil layer structure for barren soil restoration described in the utility model: the top of the anti-loosening plate is provided with first through holes and second through holes distributed in equal rows, and the first through holes and the second through holes are arranged crosswise;

[0012] Based on the above technical features: the first through hole, the second through hole and the reinforcement rod are used to reinforce the first fill layer and the second fill layer, thereby increasing the stability of the soil structure and preventing the soil from sliding.

[0013] As a preferred solution of the soil layer structure for barren soil restoration described in the utility model: the inner walls of the first through hole and the second through hole are both concave in a hexagonal shape;

[0014] Based on the above technical features: through the first through hole and the second through hole in the hexagonal shape of the inner wall, the pressure of the anti-loosening board between the first fill layer and the second fill layer is evenly distributed, the stress concentration of the soil on the anti-loosening board is reduced, the overall strength of the anti-loosening board is ensured and it is conducive to the embedding of soil particles and the growth of plant roots.

[0015] As a preferred solution of the soil layer structure for barren soil repair described in the utility model: a plurality of reinforcing rods distributed in equal rows are also arranged on the top of the anti-loosening plate; the reinforcing rods are in a conical structure;

[0016] Based on the above technical features: through the conical reinforcement rods, the soil of the second fill layer is made more compact, thereby improving the bearing capacity and stability of the soil.

[0017] As a preferred solution of the soil layer structure for barren soil restoration described in the utility model: the thickness of the low gel solidified layer is 20-25 cm and the pressure unit of the low gel solidified layer is greater than 1 MPa; the thickness of the first fill layer and the second fill layer are both 23-30 cm;

[0018] Based on the above technical features: through the low-gel solidification layer with a thickness of 20-25cm and the first fill layer and the second fill layer with a thickness of 23-30cm, the soil structure is tightly strengthened, the phenomenon of soil erosion is reduced, and the soil's ability to retain water and fertilizer is guaranteed.

[0019] As a preferred solution of the soil layer structure for barren soil restoration described in the utility model: the fiber dosage of the ECM anti-erosion fiber protective layer is not less than 800g / m 2 .

[0020] Based on the above technical features: the fiber dosage is not less than 800g / m 2 The ECM anti-erosion fiber protective layer realizes multi-layer protection of the soil, ensuring that the soil has the functions of moisture retention, heat preservation, fertilizer retention, and rain erosion prevention, thereby improving the survival rate of plants in the soil.

[0021] As a preferred solution of the soil layer structure for barren soil repair described in the utility model: the anti-loosening plate is a polypropylene component;

[0022] Based on the above technical features: it is ensured that the anti-loosening board forms degradable plastic after degradation, avoiding it from affecting the soil condition after degradation.

[0023] (III) Beneficial effects

[0024] Compared with the prior art, the utility model provides a soil layer structure for repairing barren soil, which has the following beneficial effects:

[0025] 1. Through the low-gel solidification layer, the first fill layer, the anti-loosening board, the second fill layer and the ECM anti-erosion fiber protective layer, the barren soil can be quickly repaired, the cost of repairing the barren soil can be reduced, the process of repairing the barren soil is simple, and the efficiency of repairing the barren soil is improved; it has the advantages of low cost of soil repair, simple process and green environmental protection, which solves the problems of high cost of existing soil repair, inability to achieve green environmental protection and complicated process;

[0026] 2. The first through hole, the second through hole and the reinforcement rod are used to reinforce the first fill layer and the second fill layer, thereby increasing the stability of the soil structure and preventing the soil from sliding; the purpose of low-cost, green and environmentally friendly soil repair and simple process is achieved in the process of barren soil repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0028] Figure 2 This is an exploded view of the ECM anti-erosion fiber protective layer and the second fill layer of the utility model;

[0029] Figure 3 This is a schematic diagram of the anti-loosening plate structure of the utility model;

[0030] Figure 4 for Figure 3 A is an enlarged view of the middle image.

[0031] In the figure: 1. poor soil layer; 2. low gel solidification layer; 3. first fill layer; 4. anti-loosening plate; 41. first through hole; 42. second through hole; 43. reinforcement rod; 5. second fill layer; 6. ECM anti-erosion fiber protective layer. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] See also Figure 1-4 , the utility model provides a technical solution:

[0034] A soil layer structure for barren soil restoration, the soil layer structure is laid on the top of a barren soil layer 1, and includes a low gel solidification layer 2, a first fill layer 3, a second fill layer 5 and an ECM anti-erosion fiber protection layer 6 in sequence from the barren soil layer 1 upwards, and a polypropylene anti-loosening plate 4 is also arranged between the first fill layer 3 and the second fill layer 5, the thickness of the low gel solidification layer 2 is 20-25cm, and the pressure unit of the low gel solidification layer 2 is greater than 1Mpa, the thickness of the first fill layer 3 and the second fill layer 5 are both 23-30cm, and the fiber dosage of the ECM anti-erosion fiber protection layer 6 is not less than 800g / m 2 , the anti-loosening plate 4 is a polypropylene component;

[0035] In this embodiment, in the repair of barren soil, solid waste-based cementitious materials, engineering waste slag and waste mud are poured into a mixer and stirred evenly. Since solid waste-based cementitious materials are mixed with a variety of natural and artificial inorganic mineral raw materials and processed by physical and chemical activity stimulation, they are a new, efficient, green and environmentally friendly solidification material. Therefore, the obtained low-gel solidification layer 2 will not harm the soil. The evenly stirred low-gel solidification liquid is sprayed on the barren soil layer 1 through a feeding pump, so that the thickness of the low-gel solidification layer 2 sprayed on the barren soil layer 1 is 20-25cm. Since solid waste-based cementitious materials can fully stimulate the activity of soil particles, the soil particles and materials are compounded to form new cementitious materials, which are self-cemented and solidified, and can cement the bulk materials with a particle size of less than 10μm into a whole; sand, gravel, etc. are filled on the low-gel solidification layer 2 to form a first fill layer 3, so that the thickness of the first fill layer 3 is 23-30cm, and the anti-loosening board is placed. 4 is laid on the first fill layer 3, and sand, gravel, etc. are filled again to form a second fill layer 5, so that the thickness of the second fill layer 5 is 23-30cm, thereby reinforcing the soil; the water-soluble plant fiber is mixed and sprayed on the surface of the second fill layer 5, so that it can quickly bond with the original soil to form an ECM anti-erosion fiber protective layer 6. Because the ECM anti-erosion fiber protective layer 6 forms an anti-erosion protective layer, the soil has the function of absorbing and retaining water and can resist heavy rain 4 to 6 hours after spraying, so that the soil layer structure process of repairing poor soil is simple, and the multi-layer protection of the soil has the functions of moisturizing, heat preservation, fertilizer retention, and rainwater erosion prevention, and the plant survival rate is greatly improved, which can promote the rapid germination of plants and achieve the effect of becoming a turf in the shortest time. All materials used in the ECM anti-erosion fiber protective layer 6 are naturally degradable environmentally friendly materials, environmentally friendly and ecological, and no fertilizers and pesticides are added during the implementation process, and no secondary pollution is caused to the surrounding soil and water quality.

[0036] In a preferred embodiment, Figure 1 , Figure 2 and Figure 3 As shown, the low gel solidified layer 2 is obtained by mixing solid waste-based cementitious materials, engineering waste slag and waste mud, and can self-cement and solidify, and cement the bulk materials with a particle size of less than 10 μm into a whole.

[0037] In a preferred embodiment, Figure 1 , Figure 2 and Figure 3 As shown, the first fill layer 3 and the second fill layer 5 are both formed of filled sand, gravel, etc., and the thickness of the first fill layer 3 and the second fill layer 5 are both 23-30 cm.

[0038] In a preferred embodiment, Figure 4As shown, the top of the anti-loosening plate 4 is provided with first through holes 41 and second through holes 42 which are evenly distributed in rows, and the top of the anti-loosening plate 4 is also fixedly connected with reinforcement rods 43 which are evenly distributed in rows, the inner walls of the first through holes 41 and the second through holes 42 are both concave in a hexagonal shape, and the reinforcement rods 43 are overall in a conical shape;

[0039] In this embodiment, the first through hole 41 and the second through hole 42 are located between the first fill layer 3 and the second fill layer 5, and the reinforcement rod 43 is located in the second fill layer 5. The arrangement of the first through hole 41, the second through hole 42 and the reinforcement rod 43 can reinforce the soil of the first fill layer 3 and the second fill layer 5 to form an integral soil layer structure, thereby avoiding collapse during watering due to excessive thickness of the fill layer during paving and enhancing the integrity of the soil.

[0040] In a preferred embodiment, Figure 1 , Figure 2 and Figure 3 As shown, the ECM anti-corrosion fiber protective layer 6 is formed by crushing and laying naturally degradable environmentally friendly materials.

[0041] During the construction of the soil layer structure for barren soil repair of the utility model, solid waste-based cementitious materials, engineering waste slag and waste mud are poured into a mixer and mixed evenly, and the evenly mixed low-gel solidified liquid is sprayed on the barren soil layer 1 through a feeding pump, so that the thickness of the low-gel solidified layer 2 sprayed on the barren soil layer 1 is 20-25 cm, because the solid waste-based cementitious materials can fully stimulate the activity of soil particles, so that the soil particles and materials are compounded to form new cementitious materials, self-cementation and solidification, and can cement the bulk materials with a particle size of less than 10 μm into a whole, fill sand, gravel, etc. on the low-gel solidified layer 2, so that the thickness of the first filling layer 3 is 25 cm, and the anti-loosening board 4 is laid on the first filling layer 3, and sand, gravel, etc. are filled again to make the second filling layer The thickness of the first through hole 41 and the second through hole 42 is 25 cm, the first through hole 41 and the second through hole 42 are located between the first filling layer 3 and the second filling layer 5, the reinforcement rod 43 is located in the second filling layer 5, and the soil is reinforced. The water-soluble plant fibers are mixed by special equipment and sprayed on the surface of the second filling layer 5, so that the fibers are quickly bonded with the original soil to form an ECM anti-erosion fiber protective layer 6. Because the ECM anti-erosion fiber protective layer 6 forms an anti-erosion protective layer, the soil has the functions of absorbing and retaining water and can resist heavy rain after 4 to 6 hours of spraying, so that the soil layer structure process of repairing poor soil is simple, and the soil is protected by multiple layers, so that the soil has the functions of retaining moisture, heat preservation, fertilizer retention, and rainwater erosion prevention, the survival rate of plants is greatly improved, and the rapid germination of plants can be promoted to achieve the effect of terracing in the shortest time.

[0042] It should be noted that the raw materials of the low gel solidification layer 2, the first filling layer 3, the second filling layer 5 and the ECM anti-corrosion fiber protection layer 6 in the above description are all relatively mature raw materials in existing technology. The specific raw materials can be selected according to actual needs and will not be elaborated here.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0044] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A soil layer structure for remediation of barren soil, characterized in that: The invention is laid on the top of the barren soil layer (1), and comprises, from the barren soil layer (1) upwards, a low gel solidification layer (2), a first fill layer (3), a second fill layer (5) and an ECM anti-erosion fiber protection layer (6), and a polypropylene anti-loosening plate (4) is also arranged between the first fill layer (3) and the second fill layer (5).

2. A soil layer structure for barren soil restoration as claimed in claim 1, characterized in that: The top of the anti-loosening plate (4) is provided with first through holes (41) and second through holes (42) which are distributed in equal rows, and the first through holes (41) and the second through holes (42) are arranged crosswise.

3. A soil layer structure for barren soil restoration as claimed in claim 2, characterized in that: The inner walls of the first through hole (41) and the second through hole (42) are both concave in a hexagonal shape.

4. The soil layer structure for barren soil restoration according to claim 1, characterized in that: A plurality of reinforcement rods (43) distributed in equal rows are also provided on the top of the anti-loosening plate (4).

5. The soil layer structure for barren soil restoration according to claim 4, characterized in that: The reinforcement rod (43) has a conical structure.

6. The soil layer structure for barren soil restoration according to claim 1, characterized in that: The thickness of the low gel solidified layer (2) is 20-25 cm and the pressure unit of the low gel solidified layer (2) is greater than 1 MPa.

7. The soil layer structure for barren soil restoration according to claim 1, characterized in that: The thickness of the first fill layer (3) and the second fill layer (5) are both 23-30 cm.

8. The soil layer structure for barren soil restoration according to claim 1, characterized in that: The fiber dosage of the ECM anti-erosion fiber protective layer (6) is not less than 800 g / m².

9. The soil layer structure for barren soil restoration according to claim 1, characterized in that: The anti-loosening plate (4) is a polypropylene component.

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