Saline-alkali soil layered soil foundation structure
By setting up dense root interlayers, distribution interlayers, extension interlayers, and deep-end isolation filling interlayers and tightly packed particles at the soil interface in the layered soil foundation structure of saline-alkali land, and using geotextiles to prevent the migration of fine loess particles, the problem of insufficient capillary water rise was solved, and the soil stability and plant root water absorption capacity were improved.
Patent Information
- Application Number
- CN202520366863.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-03-04
AI Technical Summary
In aeolian sand structures, capillary water cannot continue to rise when it encounters dead voids during its ascent, resulting in a decrease in capillary water volume in the upper part, an increase in gravitational potential, and a weakening of the soil matrix's ability to adsorb and bind water, leading to insufficient water absorption by plant roots.
The foundation structure of the saline-alkali soil layered structure includes a soil tillage surface layer, a soil migration isolation layer, and a tillage base layer. By setting up a root-dense interlayer, a root-distribution interlayer, and a root-extension interlayer, and setting a deep-end isolation filling interlayer and a tightly packed soil interface layer at a deeper depth, geotextile made of fiber fabric is used as a particle migration protection layer to prevent the migration of fine loess particles and enhance the stability of water column rise height and particle gaps.
It effectively increases the capillary water rise height, enhances the stability of fine loess particles inside the soil tillage layer, ensures that plant roots can absorb enough water and nutrients, and solves the problem of insufficient water absorption by plant roots.
Smart Images
Figure CN223786558U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of soil structure improvement technology, specifically a layered soil foundation structure for saline-alkali land. Background Technology
[0002] Above the groundwater level, water rises along the narrow gaps between soil particles under the influence of capillary force, forming capillary bands. Capillary water is an important component of vadose zone water and is closely related to water absorption by plant roots, soil salinization, and engineering safety. Because aeolian sand has a relatively simple structure, its particle size distribution is the main factor affecting its capillary phenomenon. The main reasons for this phenomenon are the dead voids in the aeolian sand, the adsorption of the soil matrix, and gravitational potential. When water rises along the capillary channels and encounters dead voids, it cannot continue to rise, resulting in less capillary water reaching the upper part than the lower part. Therefore, as the height of the capillary rise increases, the gravitational potential increases, and the soil matrix's adsorption and binding capacity for water weakens, thus retaining less water than the lower layer, easily leading to insufficient water absorption by plant roots. To solve this problem… Utility Model Content
[0003] To address the problems in the existing technology, this utility model provides a layered soil foundation structure for saline-alkali land.
[0004] The technical solution adopted by this utility model to solve its technical problem is: a layered soil foundation structure for saline-alkali land, including a soil tillage surface layer, a soil migration isolation layer, and a tillage base layer. The soil tillage surface layer is composed of a root-dense interlayer, a root-distribution interlayer, and a root-extension interlayer from top to bottom. The tillage base layer is located above the root-dense interlayer. The soil migration isolation layer includes a deep-end isolation filling interlayer and soil-connecting surface compact particles. The deep-end isolation filling interlayer is located below the root-extension interlayer. The inner side of the deep-end isolation filling interlayer is filled with soil-connecting surface compact particles. A particle migration protection layer is provided between the deep-end isolation filling interlayer and the root-extension interlayer.
[0005] Preferably, the particle size of the tightly packed particles in the soil interface is 1.9 mm to 2.1 mm.
[0006] Preferably, the total filling thickness of the tightly packed particles on the soil interface along the deep end isolation filling interlayer is 9.8-10.2 mm.
[0007] Preferably, the total thickness of the soil tillage layer is 30cm, wherein the thickness of the dense root layer is 12cm, the thickness of the root distribution layer is 6cm, and the thickness of the root extension layer is 12cm.
[0008] Preferably, the particle migration protection layer is made of geotextile fabric.
[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: a soil tillage surface layer with a total thickness of 30cm is formed by a dense root interlayer, a root distribution interlayer, and a root extension interlayer. A deep end isolation filling interlayer is set at the bottom to fill the tightly packed particles of the soil interface. This increases the height of the water column due to the influence of the gaps between the tightly packed particles of the soil interface. Furthermore, due to the reduction of the gaps between the tightly packed particles of the soil interface and the interception of the particle migration protection layer laid between the root extension interlayer and the deep end isolation filling interlayer, the downward migration of fine loess particles in the soil tillage surface layer can be effectively reduced, ensuring the stability of the fine loess particles inside the soil tillage surface layer. Attached Figure Description
[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0011] Figure 1 This is a schematic diagram of the structure of this utility model;
[0012] Figure 2 This is a schematic diagram illustrating the effect of loose soil on pore size in existing technologies;
[0013] Figure 3 This is a schematic diagram illustrating the effect of compacted soil on pore size in existing technologies.
[0014] In the diagram: 1. Soil tillage surface layer; 11. Dense root layer; 12. Root distribution layer; 13. Root extension layer; 2. Soil migration isolation layer; 21. Deep end isolation filling layer; 22. Dense soil particles; 3. Tillage base layer; 4. Particle migration protection layer. Detailed Implementation
[0015] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0016] like Figures 1-3 As shown, the present invention discloses a layered soil foundation structure for saline-alkali land, comprising a soil tillage surface layer 1, a soil migration isolation layer 2, and a tillage base layer 3. The soil tillage surface layer 1 is composed of a root-dense interlayer 11, a root-distribution interlayer 12, and a root-extension interlayer 13 from top to bottom. The tillage base layer 3 is located above the root-dense interlayer 11. The soil migration isolation layer 2 includes a deep-end isolation filling interlayer 21 and soil-connecting surface compact particles 22. The deep-end isolation filling interlayer 21 is located below the root-extension interlayer 13. The inner side of the deep-end isolation filling interlayer 21 is filled with soil-connecting surface compact particles 22. A particle migration protection layer 4 is provided between the deep-end isolation filling interlayer 21 and the root-extension interlayer 13.
[0017] To address the issues of dead voids in aeolian sand and the influence of soil matrix adsorption and gravitational potential, which prevent water from continuing its ascent through capillary channels and encountering dead voids, resulting in less capillary water reaching the upper part than the lower part, and consequently, an increase in gravitational potential as capillary water rises, the soil matrix's ability to adsorb and constrain water weakens, thus retaining less water than the bottom layer and easily causing insufficient water absorption by plant roots, this invention proposes a layered soil foundation structure for saline-alkali land. This structure reconstructs the soil structure by setting up a soil tillage surface layer 1, a soil migration isolation layer 2, a tillage base layer 3, and a particle migration protection layer 4. By reducing the downward migration of fine loess particles in the soil tillage surface layer 1, the stability of the fine loess particles within the soil tillage surface layer 1 is improved, thereby solving this technical problem.
[0018] In one optional embodiment of this example, the total thickness of the soil tillage layer 1 is 30cm, wherein the thickness of the root-dense interlayer 11 is 12cm, the thickness of the root-distribution interlayer 12 is 6cm, and the thickness of the root-extension interlayer 13 is 12cm.
[0019] In this embodiment, the root-dense interlayer 11 is located at the top of the soil tillage surface layer 1, starting from the tillage base layer 3 in the 0-12cm range. It is closest to the base surface, has a high organic matter content, and is loose, with good air permeability and water retention. This allows the roots of the crop to be densely distributed within the area covered by the root-dense interlayer 11 during planting. The root distribution interlayer 12 is located in the middle of the soil tillage surface layer 1, and is set in the 12-18cm range of the soil tillage surface layer 1, starting from the deepest part of the root-dense interlayer 11. The soil at position 12 has a higher density. With increased compactness, air permeability and water retention decrease slightly. Therefore, the crop root system is mainly distributed from the taproot and lateral roots to the root distribution interlayer 12. The root distribution interlayer 12 is mainly used to absorb water and nutrients. The root extension interlayer 13 is located in the deep layer of the soil tillage surface group 1. It is set in the 18-30cm range of the soil tillage surface group 1, starting from the deepest point of the root distribution interlayer 12. In this soil range, the crop root system is less distributed and mainly serves as the root extension area of deep-rooted crops, storing deep water and nutrients for the crop to use when there is drought or insufficient nutrients.
[0020] In one optional embodiment of this example, the particle size of the compact particles 22 at the soil interface is 1.9 mm to 2.1 mm.
[0021] In one optional embodiment of this example, the total filling thickness of the soil bonding surface compact particles 22 in the deep end isolation filling interlayer 21 is 9.8-10.2 mm.
[0022] The particle migration protection layer 4 is made of geotextile fabric; the geotextile is a permeable geosynthetic material made of synthetic fibers by needle punching or weaving. The particle migration protection layer 4 isolates soil particles by covering the root extension interlayer 13 and the deep end isolation filling interlayer 21 with geotextile.
[0023] In this embodiment, the compact particles 22 of the soil interface are selected from coal gangue as the filling material inside the deep end isolation filling interlayer 21. After the compact particles 22 of the soil interface are filled into the deep end isolation filling interlayer 21, they are used to reduce the soil pore size inside the deep end isolation filling interlayer 21. By cooperating with the isolation layer formed by the particle migration protection layer 4, the fine loess particles are prevented from migrating directly downward along the deep end isolation filling interlayer 21.
[0024] The working principle and usage process of this utility model are as follows: A soil tillage surface layer with a total thickness of 30cm is formed by a root-dense interlayer 11, a root-distribution interlayer 12, and a root-extension interlayer 13. A deep-end isolation filling interlayer 21 is set at the bottom of the soil tillage surface layer 1 to fill the compact particles 22 of the soil interface. This increases the height of the water column due to the influence of the gaps between the compact particles 22 of the soil interface. Furthermore, due to the reduction of the gaps between the compact particles 22 of the soil interface and the interception of the particle migration protection layer 4 laid between the root-extension interlayer 13 and the deep-end isolation filling interlayer 21, the downward migration of fine loess particles in the soil tillage surface layer 1 can be effectively reduced, ensuring the stability of the fine loess particles inside the soil tillage surface layer 1.
[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A layered soil foundation structure for saline-alkali land, characterized in that: The system includes a soil tillage surface layer (1), a soil migration isolation layer (2), and a tillage base layer (3). The soil tillage surface layer (1) is composed of a root-dense interlayer (11), a root-distribution interlayer (12), and a root-extension interlayer (13) from top to bottom. The tillage base layer (3) is located above the root-dense interlayer (11). The soil migration isolation layer (2) includes a deep-end isolation filling interlayer (21) and soil-connecting surface compact particles (22). The deep-end isolation filling interlayer (21) is located below the root-extension interlayer (13). The inner side of the deep-end isolation filling interlayer (21) is filled with soil-connecting surface compact particles (22). A particle migration protection layer (4) is provided between the deep-end isolation filling interlayer (21) and the root-extension interlayer (13).
2. The saline-alkali layered soil foundation structure according to claim 1, characterized in that: The particle size of the compact particles (22) at the soil interface is 1.9 mm to 2.1 mm.
3. The saline-alkali layered soil foundation structure according to claim 1, characterized in that: The total filling thickness of the compact particles (22) at the soil interface along the deep end isolation filling interlayer (21) is 9.8-10.2 mm.
4. The saline-alkali layered soil foundation structure according to claim 3, characterized in that: The total thickness of the soil tillage layer (1) is 30cm, wherein the thickness of the root-dense interlayer (11) is 12cm, the thickness of the root-distribution interlayer (12) is 6cm, and the thickness of the root-extension interlayer (13) is 12cm.
5. The saline-alkali layered soil foundation structure according to claim 1, characterized in that: The particle migration protection layer (4) is made of geotextile fabric.