A novel structure for understory economic land use and a method for solidifying understory soil.

Abstract

This invention provides a novel structure for economic land use under forest cover, comprising, from bottom to top, a native soil layer, a mesh layer, a water-conducting grid layer, a sand cushion layer, and a solidified soil layer. The mesh layer covers the native soil layer, and the water-conducting grid layer covers the mesh layer. The mesh layer includes an HDPE three-dimensional honeycomb grid with a height of 10±5mm. The sand cushion layer, composed of medium-coarse sand and / or gravel, is filled within the HDPE three-dimensional honeycomb grid. The solidified soil layer covers the sand cushion layer. This entire structural system ensures natural water infiltration and circulation, meets ecological protection requirements, and avoids the damage to forest ecological functions caused by traditional hard paving. The solidification method used efficiently utilizes the in-situ soil under the forest cover, reducing the need for purchased materials and waste soil, thus lowering construction costs and ecological disturbance. The crystals produced by the solidifying agent are embedded in the native soil under the forest cover, acting as a framework and making the native soil more stable.

Description

Technical Field

[0001] This invention relates to the field of agroforestry and land use technology, specifically to a novel structure for understory economic land use and a method for solidifying understory soil. Background Technology

[0002] Understory economy is a diversified management model that relies on forest resources and space to develop activities such as planting, breeding, harvesting, and recreation. It is of great significance for improving the comprehensive benefits of forest land and increasing farmers' income. Currently, common understory economy models mainly involve the simple utilization of understory space and can be roughly divided into the following types: understory planting model, understory breeding model, and understory recreation model.

[0003] However, existing under-forest production and management units generally face the predicament of "inaccessible roads, unreliable electricity, and insufficient water." There is a lack of unified planning and construction of irrigation, power supply, roads, and production management facilities. However, current policies advocating for natural ecological protection and restoration explicitly prohibit the use of toxic or harmful waste as fertilizer or for land reclamation; prohibit the entry of substandard sludge into arable land, forest land, or green space; prohibit the discharge of tailings, slag, and substandard dredged sediment that may cause soil pollution into agricultural land; restrict the construction of large-scale hard paving, large artificial mountains, fountains, and other artificial facilities in green spaces; restrict the large-scale use of imported soil to alter the original topography; strictly protect and utilize the original natural vegetation and trees of the site; and strictly restrict the use of non-native plants and artificial landscaping methods for rural greening construction. Therefore, it is impossible to transform under-forest economic land into the required and satisfactory structure using existing technologies and materials; thus, existing technologies have certain limitations. Summary of the Invention

[0004] This invention is made to solve the above-mentioned problems, and aims to provide a new structure and method for solidifying forest soil that can effectively stabilize forest foundations, improve drainage performance, strictly comply with ecological protection policies, use local materials, and be environmentally friendly.

[0005] This invention provides a novel structure for economic land use under forests, characterized by comprising, from bottom to top, a soil layer, a mesh layer, a water-conducting mesh layer, a sand cushion layer, and a solidified soil layer.

[0006] The structure consists of a mesh layer covering the original soil layer, a water-conducting grid layer covering the mesh layer, an HDPE three-dimensional honeycomb grid with a height of 100±50mm, a sand cushion layer filling the HDPE three-dimensional honeycomb grid, the sand cushion layer being composed of medium-coarse sand and / or gravel, and a solidified soil layer covering the sand cushion layer.

[0007] The novel structure for understory economic land provided by this invention also has the following feature: the mesh layer is geotextile.

[0008] The novel structure for understory economic land provided by this invention also has the following characteristics: the medium-coarse sand and gravel used in the sand cushion layer have a particle size of 10~15mm.

[0009] This invention also provides a method for solidifying forest understory soil, used to produce solidified soil, applicable to any of the above-mentioned novel structures for economic land use under forests, and characterized by the following steps: S1. Add the original forest soil to the mixing mixer and add 3-6% of the original soil weight of solidifying agent; S2. Start the mixer and mix at room temperature for 5-10 minutes to make the original soil evenly mixed. Then, put the evenly mixed modified soil into the dryer and dry it for at least half an hour or let it air dry for at least 3 days to obtain solidified soil with a moisture content of no more than 25%.

[0010] The forest soil solidification method provided by the present invention also has the following characteristics: by weight ratio, the solidifying agent includes 50% to 60% magnesium inorganic minerals, 12% to 15% calcium inorganic minerals, 5% to 10% clay minerals, and 5% to 10% activated alumina.

[0011] Furthermore, the inorganic mineral form of magnesium is magnesium oxide.

[0012] Furthermore, the inorganic mineral form of calcium is calcium carbonate.

[0013] Furthermore, the particle size of the curing agent is less than 120 μm.

[0014] The forest soil solidification method provided by the present invention also has the following feature: the mixer is an impeller centrifugal mixer.

[0015] The forest soil solidification method provided by this invention also has the following feature: the dryer is a blower dryer.

[0016] The role and effect of invention According to the present invention, a novel structure for understory economic land and a method for solidifying understory soil ensure natural water infiltration and circulation, meeting ecological protection requirements and avoiding the damage to forest ecological functions caused by traditional hard paving. The solidification method used can efficiently utilize in-situ understory soil, reduce the purchase of external materials and waste soil, and lower construction costs and ecological disturbance. Specifically, the crystals generated by the solidifying agent are embedded in the original understory soil, acting as a framework, making the original understory soil more stable, and the heavy metals in the original understory soil form more stable precipitates, which adhere to the surface of the crystal nuclei through ion surface adsorption. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a novel structure for understory economic land use according to the present invention; Figure 2 This is a top view of the water-conducting grid layer in a novel structure for understory economic land use according to the present invention. Attached Figure

[0018] 10. Original soil layer; 20. Mesh layer; 30. Water-conducting mesh layer; 40. Sand cushion layer; 50. Stabilized soil layer. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this invention easier to understand, the following embodiments are described in detail with reference to the accompanying drawings. Example

[0020] This embodiment provides a novel structure for understory economic land use, used to construct a stable and permeable working passage in a forest area. From bottom to top, it includes a soil layer 10, a mesh layer 20, a water-conducting mesh layer 30, a sand cushion layer 40, and a solidified soil layer 50.

[0021] The mesh layer 20 covers the original soil layer 10 and mainly serves as an isolation and filter to prevent fine particles from seeping down and clogging the lower layer. The water-conducting grid layer 30 covers the mesh layer 20 and includes an HDPE three-dimensional honeycomb grid with a height of 100±50mm. The sand cushion layer 40 is composed of medium-coarse sand and / or gravel and is filled in the HDPE three-dimensional honeycomb grid to form a stable drainage and stress diffusion layer. The solidified soil layer 50 covers the sand cushion layer 40 and is composed of the original forest soil treated with a solidifying agent.

[0022] In this embodiment, the mesh layer 20 is preferably a geotextile.

[0023] In this embodiment, the particle size of the medium-coarse sand and gravel used in the sand cushion layer 40 is preferably 10~15mm.

[0024] The construction steps are as follows: First, the existing original soil layer 10 on the site is leveled.

[0025] Secondly, lay a 20-layer mesh fabric. In this embodiment, a 150g / ㎡ polypropylene spunbond geotextile is selected. The fabric is laid flat, and the seams overlap by no less than 20cm.

[0026] Next, a water-guiding mesh layer 30 is laid, using a 100mm high HDPE three-dimensional honeycomb mesh, with the mesh pieces firmly connected using special plastic fasteners.

[0027] Then, a sand cushion layer 40 is filled into the honeycomb grid. The sand cushion layer 40 is made of medium-coarse sand with a particle size of 10-15mm and crushed stone mixed in a 1:1 volume ratio. It is filled to the level of the top of the grid and compacted by vibration.

[0028] Subsequently, a 50mm thick layer of solidified soil was laid.

[0029] Finally, simple drainage ditches can be installed on both sides of the structure, depending on the terrain, to systematically drain any surface water that may accumulate. If it is necessary to connect areas with different elevations, stable steps can be constructed using the same structural principles.

[0030] This embodiment also provides a method for solidifying forest understory soil, applicable to the solidified soil in the aforementioned solidified soil layer 50, comprising the following steps: S1. Add the original forest soil to the mixing mixer and add 3-6% of the original soil weight of solidifying agent; S2. Start the mixer and mix at room temperature for 5-10 minutes to make the original soil evenly mixed. Then, put the evenly mixed modified soil into the dryer and dry it for at least half an hour or let it air dry for at least 3 days to obtain solidified soil with a moisture content of no more than 25%.

[0031] In this embodiment, the curing agent comprises, by weight, 50% to 60% magnesium inorganic minerals, 12% to 15% calcium inorganic minerals, 5% to 10% clay minerals, and 5% to 10% activated alumina.

[0032] Among them, the inorganic mineral of magnesium is preferably magnesium oxide; the inorganic mineral of calcium is preferably calcium carbonate; and the particle size of the curing agent is preferably less than 120 μm.

[0033] In this embodiment, the mixer is preferably an impeller centrifugal mixer.

[0034] In this embodiment, the dryer is preferably a blower dryer.

[0035] The specific steps for on-site preparation of solidified soil are as follows: Local forest soil was collected and mixed with a special solidifying agent at a weight of 4.5% (composition by weight: 58% magnesium oxide, 13% calcium carbonate, 8% bentonite, 8% activated alumina, with the remainder being processing additives; powder fineness D100 < 120 μm). The soil and solidifying agent were mixed for 7 minutes using an impeller centrifugal mixer. The mixed modified soil was then spread out on-site and allowed to air dry naturally for 4 days. The moisture content was measured to have dropped to below 22%, forming stable and permeable solidified soil.

[0036] The role and effect of the embodiments According to the present invention, a novel structure for understory economic land and a method for solidifying understory soil ensure natural water infiltration and circulation, meeting ecological protection requirements and avoiding the damage to forest ecological functions caused by traditional hard paving. The solidification method used can efficiently utilize in-situ understory soil, reduce the purchase of external materials and waste soil, and lower construction costs and ecological disturbance. Specifically, the crystals generated by the solidifying agent are embedded in the original understory soil, acting as a framework, making the original understory soil more stable, and the heavy metals in the original understory soil form more stable precipitates, which adhere to the surface of the crystal nuclei through ion surface adsorption.

[0037] The above embodiments are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention.

Claims

1. A novel structure for understory economic land use, characterized in that, From bottom to top, it includes: the original soil layer, the mesh layer, the water-conducting mesh layer, the sand cushion layer, and the solidified soil layer. The mesh layer covers the original soil layer, the water-conducting mesh layer covers the mesh layer, including HDPE three-dimensional honeycomb mesh, the height of the HDPE three-dimensional honeycomb mesh is set to 100±50mm, the sand cushion layer is filled in the HDPE three-dimensional honeycomb mesh, the sand cushion layer is composed of medium and coarse sand and / or gravel, and the solidified soil layer covers the sand cushion layer.

2. The novel structure of understory economic land use according to claim 1, characterized in that: in, The mesh layer is geotextile.

3. The novel structure of understory economic land use according to claim 1, characterized in that: in, The medium-coarse sand and gravel used in the sand cushion layer have a particle size of 10~15mm.

4. A method for solidifying forest understory soil, used to produce solidified soil, applicable to the novel structure of forest understory economic land as described in claims 1-3, characterized in that, Includes the following steps: S1. Add the original forest soil to the mixing mixer and add 3-6% of the original soil weight of the solidifying agent; S2. Start the mixer and mix at room temperature for 5-10 minutes to make the original soil evenly mixed. Then, put the evenly mixed modified soil into the dryer and dry it for at least half an hour or let it air dry for at least 3 days to obtain solidified soil with a moisture content of no more than 25%.

5. The method for solidifying forest understory soil according to claim 4, characterized in that: By weight, the curing agent comprises 50% to 60% magnesium inorganic minerals, 12% to 15% calcium inorganic minerals, 5% to 10% clay minerals, and 5% to 10% activated alumina.

6. The method for solidifying forest understory soil according to claim 5, characterized in that: in, The inorganic mineral of magnesium is magnesium oxide.

7. The method for solidifying forest understory soil according to claim 5, characterized in that: in, The inorganic mineral of calcium mentioned is calcium carbonate.

8. The method for solidifying forest understory soil according to claim 5, characterized in that: in, The particle size of the curing agent is less than 120 μm.

9. The method for solidifying forest understory soil according to claim 4, characterized in that: in, The mixer is an impeller centrifugal mixer.

10. The method for solidifying forest understory soil according to claim 4, characterized in that: in, The dryer is a blower dryer.

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