Construction methods and devices for wind erosion prevention of desert sand based on biomimetic mineralization

Abstract

A construction method for preventing wind erosion in desert sand based on biomimetic mineralization is provided, comprising: arranging multiple construction points in the construction area of ​​the desert region to be treated; at one construction point, using the lifting and guiding unit of the biomimetic mineralization device, conveying cementing liquid A and cementing liquid B to a first preset depth through independent conveying pipelines to form a first mineralization consolidation area; using the lifting and guiding unit, conveying cementing liquid A and cementing liquid B to a second preset depth through independent conveying pipelines to form a second mineralization consolidation area; using the lifting and guiding unit, conveying cementing liquid A and cementing liquid B to a third preset depth through independent conveying pipelines to form a third mineralization consolidation area, thereby forming a longitudinally continuous mineralization column unit at the same construction point; transferring the biomimetic mineralization device to the next construction point and repeating the operation to connect multiple mineralization column units laterally, forming a three-dimensional mineralization anchoring network structure in the gaps of the desert sand in the construction area.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering, and in particular to a construction method and apparatus for preventing wind erosion in desert sand based on biomimetic mineralization. Background Technology

[0002] Desertification and wind erosion are widespread ecological and environmental problems, especially in arid and semi-arid regions. Strong winds can easily trigger the migration of surface sand particles and dust storms, severely impacting the ecological environment, traffic safety, and human health. Therefore, how to improve the wind erosion resistance of desert sand without damaging the ecosystem is a pressing technical problem that needs to be solved in the fields of geotechnical engineering and environmental remediation.

[0003] Methods for preventing wind erosion of desert sand in related technologies mainly include mechanical sand fixation, biological sand fixation, and chemical sand fixation. Mechanical sand fixation methods typically cover or block the sand surface by setting up structures such as straw checkerboards and sand barriers. These methods have long construction cycles, high labor costs, and limited durability, easily failing in strong winds. Biological sand fixation methods mainly rely on vegetation or biological cover, offering good ecological benefits, but are highly dependent on water and climate conditions, have a long effective period, and are difficult to form stable wind erosion-resistant structures in a short time. Chemical sand fixation methods typically apply solidifying agents or binding materials to the sand surface to form a surface crust, thereby inhibiting sand particle movement. However, these methods are mostly focused on surface treatment, with limited consolidation depth. Under long-term wind erosion or external disturbances, the surface crust is prone to peeling or destruction, leading to a decrease in wind erosion prevention effectiveness. Furthermore, some chemical sand fixation materials have insufficient environmental compatibility or long-term residue risks, limiting their large-scale application.

[0004] Therefore, it is necessary to find a way to prevent desert sand from being eroded by wind and to achieve deep consolidation of desert sand. Summary of the Invention

[0005] In view of this, in order to at least partially solve the aforementioned technical problems, the present invention provides a construction method and apparatus for preventing wind erosion of desert sand based on biomimetic mineralization.

[0006] According to one embodiment of the present invention, a construction method for preventing wind erosion in desert sand based on biomimetic mineralization is provided, comprising the following steps: Step A: Arranging multiple construction points in the construction area of ​​the desert region to be treated; Step B: At one construction point, using the lifting and guiding unit of the biomimetic mineralization device, cementing liquid A and cementing liquid B are respectively transported to a first preset depth through independent conveying pipelines, so that cementing liquid A and cementing liquid B mix in situ at the first preset depth and diffuse radially into the surrounding sand body to form a first mineralization consolidation area; Step C: At the same construction point, using the lifting and guiding unit of the biomimetic mineralization device, cementing liquid A and cementing liquid B are respectively transported to a second preset depth through independent conveying pipelines, so that cementing liquid A and cementing liquid B mix in situ at the second preset depth and diffuse radially into the surrounding sand body to form a second... Mineralized consolidation zone; Step D: At the same construction point, using the lifting and guiding unit of the biomimetic mineralization device, cementing liquid A and cementing liquid B are transported to the third preset depth through independent delivery pipelines, so that cementing liquid A and cementing liquid B are mixed in situ at the third preset depth and diffused radially to the surrounding sand body to form the third mineralized consolidation zone, thereby forming a longitudinally continuous mineralized column unit at the same construction point; Step E: Transfer the biomimetic mineralization device to the next construction point and repeat steps B to D to connect multiple mineralized column units to each other in the lateral direction, forming a three-dimensional mineralized anchoring network structure in the gaps of desert sand in the construction area; First preset depth > Second preset depth > Third preset depth; Cementing liquid A includes: a mixed aqueous solution of water-soluble calcium salt and polyacrylic acid; Cementing liquid B includes: an aqueous solution of water-soluble carbonate.

[0007] According to another aspect of the present invention, a biomimetic mineralization device is provided for implementing the above-described construction method for desert wind erosion prevention based on biomimetic mineralization. The biomimetic mineralization device includes: a shell having a first end and a second end opposite to each other, the first end having a tapered structure suitable for insertion into the desert area to be treated; a drive unit installed at the second end of the shell; a lifting and guiding unit located at the second end of the shell, the lifting and guiding unit being adapted to allow the first end of the shell to be vertically inserted into the sand body of the desert area to be treated under the drive of the drive unit; a conveying unit located inside the shell, the conveying unit including dual-liquid independent conveying pipelines, the dual-liquid independent conveying pipelines being used to convey cementing liquid A and cementing liquid B respectively; and an insertion and injection unit sleeved inside the shell and close to the first end, the insertion and injection unit being adapted to allow cementing liquid A and cementing liquid B from the conveying unit to be mixed in situ at the first end of the shell and sprayed when inserted into the sand body, so as to diffuse radially into the surrounding sand body.

[0008] According to an embodiment of the present invention, a construction method for preventing wind erosion in desert sand based on biomimetic mineralization involves using a lifting and guiding unit to insert a biomimetic mineralization device into different depths within the desert sand. This allows for biomimetic mineralization reactions to occur at predetermined depths within the sand body, preventing premature reactions on the surface. At the same construction point, the lifting and guiding unit injects cementing liquid A and cementing liquid B at different depths, creating multiple overlapping mineralization zones in the deep, middle, and shallow layers of the desert sand. This forms a longitudinally continuous mineralization column unit at the construction point. The longitudinal mineralization columns formed at adjacent construction points overlap laterally through radial diffusion within the sand body (desert sand), thus constructing a three-dimensional mineralization anchoring network structure within the desert sand body, composed of multiple interwoven mineralization zones. This significantly improves the wind erosion resistance and overall consolidation effect of the sand body. Attached Figure Description

[0009] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings.

[0010] Figure 1 A flowchart illustrating a construction method for preventing wind erosion in desert sand based on biomimetic mineralization, according to an embodiment of the present invention, is shown.

[0011] Figure 2 A construction schematic diagram of a construction method for preventing wind erosion in desert sand based on biomimetic mineralization, according to an embodiment of the present invention, is shown.

[0012] Figure 3 A schematic diagram of the structure of the biomimetic mineralization device according to an embodiment of the present invention is shown.

[0013] In the above figures, the reference numerals are as follows:

[0014] 1. Shell; 11. First end; 12. Second end;

[0015] 2. Drive unit;

[0016] 3. Lifting guide unit; 31. Lifting actuator; 32. Lifting guide rail assembly; 33. Lifting slide;

[0017] 4. Conveying unit; 41. Dual-liquid independent conveying pipeline;

[0018] 5. Insertion injection unit; 51. Hollow insertion rod; 52. Mixer; 53. Dropper head;

[0019] 6. Install the base;

[0020] C. Construction location; D. Construction path; S. Shortest distance between adjacent construction locations; R. Boundary of curing impact. Detailed Implementation

[0021] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the invention for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0022] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "comprising" as used herein indicates the presence of features, steps, or operations, but does not exclude the presence or addition of one or more other features.

[0023] Most sand-fixing methods in related technologies focus on surface treatment, with limited consolidation depth. Under long-term wind erosion or external disturbances, the surface crust is easily peeled off or destroyed, resulting in limited wind erosion prevention effects.

[0024] In realizing the concept of this invention, it was discovered that by introducing a biomimetic mineralization method for consolidation, minerals such as calcium carbonate are induced to precipitate between desert sand particles, thereby achieving cementation and reinforcement of the sand body. This method has advantages such as a favorable environment and a relatively stable consolidation structure. However, biomimetic mineralization often uses surface spraying or natural infiltration to apply the reaction liquid, making it difficult to precisely control the reaction location and consolidation structure. This can easily lead to over-solidification of the surface layer and insufficient internal reinforcement, making it difficult to form a spatially stable consolidation structure.

[0025] To address the aforementioned problems, this invention involves injecting cementing liquid A and cementing liquid B at different depths at the same construction site. This allows cementing liquid A and cementing liquid B to mix and form continuous wind-erosion-resistant mineralized column units at different depths. By repeating this process at multiple construction sites, a continuous three-dimensional mineralized anchoring network structure is constructed within the desert sand body, significantly improving the overall stability and wind erosion resistance of the sand body.

[0026] Specifically, according to one embodiment of the present invention, a construction method for preventing wind erosion in desert sand based on biomimetic mineralization is provided. Figure 1 A flowchart of a construction method for preventing wind erosion in desert sand based on biomimetic mineralization, according to an embodiment of the present invention, is shown. Figure 2 A schematic diagram illustrating the construction method for wind erosion prevention of desert sand based on biomimetic mineralization, according to an embodiment of the present invention, is shown. Figures 1-2 As shown, the construction method includes the following steps A to E.

[0027] In step A, multiple construction sites C are set up in the construction area of ​​the desert region to be treated.

[0028] In step B, at a construction point C, the lifting and guiding unit of the biomimetic mineralization device is used to transport cementing liquid A and cementing liquid B to a first preset depth through independent delivery pipelines, so that cementing liquid A and cementing liquid B are mixed in situ at the first preset depth and diffused radially to the surrounding sand body to form a first mineralization consolidation area.

[0029] In step C, at the same construction point C, the lifting and guiding unit of the biomimetic mineralization device is used to transport cementing liquid A and cementing liquid B to the second preset depth through independent delivery pipelines, so that cementing liquid A and cementing liquid B are mixed in situ at the second preset depth and diffused radially to the surrounding sand body to form a second mineralization consolidation area.

[0030] In step D, at the same construction point C, the lifting and guiding unit of the biomimetic mineralization device is used to transport cementing liquid A and cementing liquid B to the third preset depth through independent delivery pipelines, so that cementing liquid A and cementing liquid B are mixed in situ at the third preset depth and diffused radially to the surrounding sand body to form a third mineralization consolidation area, thereby forming a longitudinally continuous mineralization column unit at the same construction point.

[0031] In step E, the biomimetic mineralization device is transferred to the next construction point C, and steps B to D are repeated to connect multiple mineralization column units to each other in the lateral direction, forming a three-dimensional mineralization anchoring network structure in the gaps of desert sand in the construction area.

[0032] According to an embodiment of the present invention, the first preset depth > the second preset depth > the third preset depth. At a construction point C, cementing liquid A and cementing liquid B are first injected from the deeper first preset depth to form an anchoring structure in the deep layer of desert sand; then the same operation is performed from the shallower middle layer to form a connecting skeleton between desert sands in the middle layer; then the same operation is performed from the shallower shallow layer to form a continuous wind-erosion resistant crust of desert sand in the shallow layer. In this way, by forming stable solidification areas in the shallow, middle and deep layers within their respective functional layers, and then connecting them into a longitudinally continuous mineralized column unit, repeating the above steps, the adjacent mineralized columns form a transverse overlap under radial action, thereby constructing a continuous three-dimensional mineralized anchoring network structure inside the sand body, significantly improving the overall stability and wind erosion resistance of the sand body.

[0033] Cementing solution A comprises a mixed aqueous solution of water-soluble calcium salt and polyacrylic acid, while cementing solution B comprises an aqueous solution of water-soluble carbonate. The water-soluble calcium salt provides calcium ions, serving as a calcium source for subsequent calcium carbonate formation. Polyacrylic acid is used as a biomimetic modifier to directionally guide the accumulation of calcium ions on the surface and contact area of ​​desert sand particles, improving the local reaction efficiency with cementing solution B. This allows the calcium carbonate formed from the reaction with carbonate ions in cementing solution B to preferentially form a stable cemented structure in the contact area of ​​the desert sand particles, thereby forming a dense and stable mineralized structure.

[0034] More specifically, the carboxyl groups in polyacrylic acid can react with Ca... 2+ An interaction occurs, causing Ca 2+ The calcium carbonate is enriched on the surface and in the contact area of ​​the sand particles, thereby improving the efficiency of local mineralization reaction and promoting the formation of a dense and stable cemented structure between the desert sand particles. The crystalline particles grow in the form of "multi-core agglomeration", filling the pores between the desert sand particles and forming a rigid connection. The NaCl generated by the reaction is a soluble salt that can be naturally lost with the evaporation of water or the infiltration of rainwater, leaving no environmental residue.

[0035] The specific values ​​of the first, second, and third preset depths can be adjusted according to the actual needs of the desert area to be processed.

[0036] In some specific implementations, the first preset depth is 10-14 cm, the second preset depth is 6-8 cm, and the third preset depth is 2-4 cm. This further forms a deep anchoring end for the desert sand at the first preset depth, a transition and connecting layer at the middle depth of the second preset depth to avoid faulting of mineralized column units within the mineralized body due to excessive depth differences, and a surface wind-resistant layer at the shallow depth of the third preset depth. This layer directly resists the initiation and transport of surface sand grains by wind, contributing to the formation of a stable, longitudinally oriented mineralized column unit.

[0037] Optionally, the first preset depth can be 10cm, 11cm, 12cm, 13cm or 14cm, or a range consisting of any two of the above values.

[0038] Optionally, the second preset depth can be 6cm, 7cm or 8cm, or a range consisting of any two of the above values.

[0039] Optionally, the third preset depth can be 2cm, 3cm or 4cm, or a range consisting of any two of the above values.

[0040] In some implementations, the shortest distance S between adjacent construction points C is 10-15 cm, and multiple construction points C can be arranged in a periodic pattern, for example... Figure 2The hexagonal array shown is used to form a periodic pattern. This helps to divide the construction area into multiple sub-construction units, allowing the injection operation to be completed point by point according to the construction path D. This ensures that the solidified areas formed by adjacent construction points C satisfy the condition that twice the solidification influence boundary R is greater than or equal to the shortest distance S between adjacent construction points C under radial diffusion. This allows adjacent mineralized columns to overlap laterally, thereby building a continuous three-dimensional mineralization anchoring network within the sand body.

[0041] In this invention, "shortest distance" can be understood as straight-line distance, that is, the line connecting adjacent construction points C.

[0042] Optionally, the shortest distance S between adjacent construction points C can be, for example, 10cm, 11cm, 12cm, 13cm, 14cm or 15cm, or a range consisting of any two of the above values.

[0043] In some implementations, at a construction point C, the volume ratio of cementing solution A to cementing solution B is 1:1. This arrangement ensures complete mineralization reaction, avoids material waste, prevents residual calcium or carbonate ions from affecting the environment, and avoids a decrease in consolidation strength due to incomplete reaction. The total injection volume of cementing solution A and cementing solution B is 80-100 mL. This arrangement facilitates the formation of a controllable radial diffusion radius for the cementing solution, such as... Figures 1-2 The solidification effect boundary R shown is formed to avoid the slurry from being lost or excessively diffused along the preferential channel due to excessive injection volume, thus reducing the mineralization density.

[0044] Optionally, the total injection volume of cementing solution A and cementing solution B is 80 mL, 90 mL, or 100 mL, or a range consisting of any two of the above values.

[0045] In some implementations, at a construction point C, the ratio of the total injection volume of cementing liquid A and cementing liquid B at the first, second, and third preset depths is (15~25):(30~40):(40~50). It can be understood that under different injection depths, the diffusion and solidification behavior of the reaction liquid (i.e., the mixture of cementing liquid A and cementing liquid B) in the sand body differs. The shallow region, close to the free surface of the sand body, is easily affected by surface disturbances and boundary conditions during injection, thus requiring a larger injection volume to ensure the formation of a continuous and stable wind-erosion resistant crust. The middle region is used to enhance the structural connectivity between adjacent mineralized column units. The deep region, located within the constrained environment of the sand body, is used to form an anchoring structure. By using different amounts at different depths, stable solidification areas are formed in the shallow, middle, and deep layers within their respective functional strata, and the solidification areas formed at adjacent construction points meet the lateral overlap conditions under radial diffusion, thus strengthening the stability of the three-dimensional mineralized anchoring network.

[0046] In some embodiments, the water-soluble calcium salt includes calcium chloride; the water-soluble carbonate includes sodium carbonate. This arrangement results in both raw materials being low-cost and highly soluble, facilitating the preparation of binders with lower viscosity and higher concentrations, while also exhibiting lower biotoxicity and being environmentally friendly.

[0047] In some embodiments, the mass concentration of polyacrylic acid in cementing solution A is 2-4 g / L, the molar concentration of calcium chloride in cementing solution A is 0.2-0.8 mol / L, and the molar concentration of sodium carbonate in cementing solution B is 0.2-0.8 mol / L. This configuration further improves the reaction efficiency of biomimetic mineralization. Specifically, the molar ratio of carbonate ions to calcium ions is 0.5-1.5, preferably 1:1. Adjusting the concentration of polyacrylic acid within the above range further facilitates the preferential formation of a stable cemented structure of calcium carbonate in the contact area of ​​desert sand particles, thereby promoting the interlocking of lateral mineralization column units.

[0048] According to another embodiment of the present invention, a biomimetic mineralization device is provided for implementing the above-described biomimetic mineralization-based desert sand wind erosion prevention construction method. Figure 3 A schematic diagram of the structure of the biomimetic mineralization device according to an embodiment of the present invention is shown, as follows: Figure 3 As shown, the biomimetic mineralization device includes: a shell 1, a drive unit 2, a lifting and guiding unit 3, a conveying unit 4, and an insertion and injection unit 5.

[0049] The shell 1 is made of a material with good mechanical strength and corrosion resistance, such as stainless steel or aluminum alloy. The shell 1 has a first end 11 and a second end 12 from bottom to top. The first end 11 has a tapered structure, which can be understood as the diameter or cross-section gradually decreasing from top to bottom to form a sharp end. The sharp end is suitable for insertion into the desert area to be treated.

[0050] The drive unit 2 is installed at the second end 12 of the housing 1. The drive unit 2 includes a drive motor (not shown in the figure) and is suitable for providing rotational or auxiliary power for the first end 11 to be inserted into the desert area to be treated, so as to reduce the resistance during the insertion process of the sand body and improve the insertion stability of the biomimetic mineralization device in the loose sand body.

[0051] The lifting and guiding unit 3 is located at the second end 12 of the housing 1. Driven by the drive unit 2, the lifting and guiding unit 3 allows the first end 11 of the housing 1 to be controllably and progressively raised and lowered into the sand in the desert area to be treated. The lifting and guiding unit 3 can employ mechanical structures such as lead screws and nuts, gears, hydraulic cylinders, or electric push rods to achieve vertical displacement control. Through guiding action, it ensures that the housing 1 moves linearly in the vertical direction, preventing deflection and lateral displacement in loose sand. The lifting and guiding unit 3 works in conjunction with the drive unit 2, which provides rotational power to reduce resistance during insertion into the sand. The lifting and guiding unit 3 is responsible for depth positioning and speed control.

[0052] The conveying unit 4 is located inside the housing 1. The conveying unit 4 includes two independent conveying pipelines 41, which are used to convey cementing liquid A and cementing liquid B respectively. This ensures that the two pipelines remain completely separated before reaching the first end 11 of the housing 1, preventing premature mixing and sedimentation that could clog the pipelines. The two independent conveying pipelines 41 can be driven by a peristaltic pump, a plunger pump, or pneumatic pressure to convey cementing liquid A and / or cementing liquid B from the storage tank (not shown) to the first end 11 of the housing 1 according to a preset flow rate and volume (e.g., a 1:1 volume ratio). The material of the two independent conveying pipelines 41 can be, for example, acid- and alkali-resistant polymer materials, such as silicone tubing, polytetrafluoroethylene, or polyethylene.

[0053] The insertion injection unit 5 is fitted inside the housing 1 and communicates with the first end 11 of the housing 1. The insertion injection unit 5 is suitable for mixing and spraying the cementing liquid A and cementing liquid B from the conveying unit 4 in situ at the first end 11 of the housing 1 when inserting sand, so as to diffuse radially to the surrounding sand. The insertion injection unit 5 can be equipped with a check valve or an anti-backflow structure as needed to prevent desert sand particles or water in the sand from being drawn back into the pipeline during the injection interval.

[0054] According to an embodiment of the present invention, in such Figure 2During construction, the insertion injection unit 5, driven by the drive unit 2, is inserted into a preset position inside the sand body. The cementing liquid is transported to the first end 11 of the shell 1 through the dual-liquid independent delivery pipeline 41, where it undergoes in-situ mixing inside the sand body. This ensures that the biomimetic mineralization reaction occurs only in the preset depth region, preventing the reaction from occurring prematurely on the delivery path or the surface of the sand body. At the same construction point, the lifting guide unit 3 drives the insertion injection unit 5 to different depth positions in sequence and performs injection operations respectively, causing the cementing liquid to form multiple overlapping mineralization zones at different levels such as shallow, middle, and deep layers, thereby forming a longitudinally continuous mineralization column unit at the construction point C. The biomimetic mineralization device moves point by point along the construction path D, repeating the above-mentioned layered injection process at multiple adjacent construction points C. The longitudinal mineralization columns formed at adjacent construction points C overlap laterally through radial diffusion, ultimately constructing a three-dimensional mineralization anchoring network formed by multiple interwoven mineralization column units inside the sand body, thereby significantly improving the wind erosion resistance and overall consolidation effect of the sand body.

[0055] In some embodiments, the lifting guide unit 3 includes, from top to bottom, a lifting actuator 31, a lifting guide rail assembly 32, and a lifting slide 33. The lifting guide rail assembly 32 is connected to the lifting actuator 31, and the lifting slide 33 is connected to the lifting actuator 31 via the lifting guide rail assembly 32. The lifting guide rail assembly 32 is used to vertically constrain the movement direction of the insertion injection unit 5, preventing swaying during insertion and lifting. The lifting actuator 31 is used to drive the lifting slide 33 to move up and down along the lifting guide rail assembly 32, achieving precise control of the insertion depth. Driven by the lifting actuator 31, the lifting slide 33 moves up and down along the lifting guide rail assembly 32 to insert the first end 11 of the housing 1 into the preset depth of the sand in the desert area to be treated.

[0056] In some embodiments, the insertion and injection unit 5 comprises, from top to bottom: a hollow insertion rod 51, a mixer 52, and a dripping head 53. A dual-liquid independent delivery pipeline 41 is located within the hollow insertion rod 51. The dual-liquid independent delivery pipeline 41 is used to deliver cementing liquid A and cementing liquid B respectively, and remains isolated from each other throughout the hollow insertion rod 51 to prevent premature reaction. The mixer 52 is located above the tapered structure of the first end 11. The dual-liquid independent delivery pipeline 41 is connected to the mixer 52, which is suitable for mixing cementing liquid A and cementing liquid B. The drip head 53 is located between the mixer 52 and the tapered structure of the first end 11, and is downstream of the mixer 52. The drip head 53 has multiple regularly arranged holes, which are suitable for radially diffusing the mixed cementing liquid A and cementing liquid B to the surrounding sand body. This allows the longitudinal mineralization column units formed by adjacent construction points C to overlap laterally through radial diffusion, thus constructing a three-dimensional mineralization anchoring network formed by multiple mineralization units interwoven inside the sand body. This significantly improves the wind erosion resistance and overall consolidation effect of the sand body.

[0057] In some embodiments, the biomimetic mineralization device further includes a mounting base 6, which may be made of stainless steel or carbon steel. The mounting base 6 is located near the first end 11 of the housing 1 and is fitted over the housing 1. The mounting base 6 is suitable for vertically placing the biomimetic mineralization device on the sand in the desert area to be treated. It provides support for the biomimetic mineralization device and, together with the lifting guide unit 3, provides vertical constraint on the insertion and injection unit 5.

[0058] In one specific implementation method, the construction process can be as follows:

[0059] According to actual needs, prepare cementing liquid A and cementing liquid B with preset concentrations, and inject them into independent storage tanks respectively, which are then connected to the dual-liquid independent delivery pipeline 41 of the biomimetic mineralization device.

[0060] The desert area to be treated is surveyed, and the construction area is divided into several sub-construction units according to actual construction needs. For example, it can be like this: Figure 2 As shown, construction points C are arranged in a hexagonal staggered grid. The shortest distance S between adjacent construction points is 10–15 cm. The preferred layering injection depth includes a shallow layer of 2–4 cm, a middle layer of 6–8 cm, and a deep layer of 10–14 cm.

[0061] The biomimetic mineralization device is moved to the target construction area, positioning it above construction point C. Driven by the driving unit 2, it reaches the preset deep position and delivers cementing liquid to the first end 11 via the dual-liquid independent delivery pipeline 41. The liquid mixes and diffuses in situ at the mixer 52, and is then delivered into the sand body via the dripping head 53. This causes the cementing liquid to mix in situ within the sand body and diffuse radially towards the surrounding sand, forming the first mineralization consolidation zone. After completing the injection at the first depth, the lifting and guiding unit 3 drives the insertion injection unit 5 to the middle layer position, repeating the injection operation to form the second mineralization consolidation zone. The insertion injection unit 5 is then driven to the shallow layer position for further injection, forming the third mineralization consolidation zone, thus creating a longitudinally continuous mineralization column unit at the same construction point C.

[0062] Move to the next construction point C and repeat the previous step. Complete the layered injection operation point by point according to the construction path D, so that the longitudinal mineralized columns formed by adjacent construction points C will overlap laterally under the radial diffusion effect, and gradually build a three-dimensional mineralized anchoring network inside the sand body.

[0063] After completing all construction points C, the treated sand body is allowed to solidify under natural conditions. The cementing liquid forms a stable mineralized structure in the pores of the sand body, thereby significantly improving the overall stability and wind erosion resistance of the sand body.

[0064] In summary, this invention provides a single-rod biomimetic mineralization device with lifting control function. The insertion depth of the insertion rod is precisely controlled by the lifting guide unit, enabling the biomimetic mineralization device to perform multi-depth injection operations at the same construction point. From the structural level of the biomimetic mineralization device, spatial control of the location where the mineralization reaction occurs is achieved, which is different from related technologies that rely on surface application or natural infiltration for sand fixation.

[0065] According to the functional requirements of different depth layers, the present invention allocates the amount of reaction liquid injected in layers, so that the shallow layer preferentially forms a continuous wind erosion resistant crust, the middle layer enhances the structural connectivity, and the deep layer forms an anchoring structure, thereby improving the stability and durability of the overall consolidation structure while ensuring the surface wind erosion resistant effect.

[0066] At the same construction site, this invention controls the insertion of the rod to inject it sequentially into the shallow, middle, and deep layers, causing the reaction liquid to form multiple overlapping mineralized consolidation zones at different depths. This creates a longitudinally continuous mineralized column unit at the construction site, providing a structural foundation for subsequent lateral connectivity. By repeatedly performing layered injection operations at multiple adjacent construction sites and appropriately setting the spacing between the sites, the longitudinal mineralized columns formed at adjacent sites undergo lateral overlap under radial diffusion, ultimately constructing a three-dimensional mineralized anchoring network within the sand body, composed of multiple interwoven mineralized units. This achieves overall stabilization and wind erosion prevention of the sand body.

[0067] The present invention will be further illustrated below through embodiments and related test experiments and results. In the following detailed description, numerous specific details are set forth for ease of explanation to provide a comprehensive understanding of the embodiments of the present invention. However, it will be apparent that one or more embodiments may be practiced without these specific details. Moreover, the details in the following embodiments can be arbitrarily combined to form other feasible embodiments without conflict.

[0068] It should be noted that the specific embodiments described below are merely illustrative examples, and the scope of protection of this invention is not limited thereto. The chemicals and raw materials used in the following embodiments are all commercially available or prepared using recognized processing methods.

[0069] Example 1:

[0070] Desert sand anti-wind erosion cementing fluid reagent preparation

[0071] The prepared desert sand anti-erosion cementing fluid reagent includes solution A and solution B: solution A is polyacrylic acid (PAA)-CaCl2 solution, and solution B is Na2CO3 solution. The target mass concentration of PAA in solution A is 3 g / L, and the ion ratio n(CO3) 2- ) / n(Ca 2+The objective is 1, with the concentration of CaCl2 in solution A being 0.5 mol / L and the concentration of Na2CO3 in solution B being 0.5 mol / L.

[0072] Construction methods for desert sand treatment

[0073] Prepare solution A and solution B according to the above ratio, inject them into separate storage tanks, and connect them to the biomimetic mineralization device.

[0074] The desert sandy area to be treated was surveyed and mapped. The construction area was divided into several sub-construction units according to the construction requirements. The construction points were arranged in a hexagonal staggered grid with a spacing of 12cm between points. The injection depth in layers included a shallow layer of 3cm, a middle layer of 7cm and a deep layer of 12cm.

[0075] The biomimetic mineralization device (single-rod type) is moved to the target construction area, positioning it above the first construction point. Driven by the driving unit, it reaches the preset deep position and delivers the reaction liquid to the mixer at the first end via a dual-liquid independent delivery pipeline. This allows the reaction liquid to mix in situ within the sand mass and diffuse radially towards the surrounding sand, forming the first mineralization consolidation zone. After completing the injection at the first depth, the hollow insertion rod is lifted to the middle layer position by the lifting and guiding unit, and the injection operation is repeated to form the second mineralization consolidation zone. The hollow insertion rod is then lifted to the shallower layer, and the injection operation is performed again to form the third mineralization consolidation zone, thus creating a longitudinally continuous mineralization column unit at the same construction point.

[0076] Instructions for the dosage of cementing fluid injected in layers: At a single construction site, the total injection volume of liquid A and liquid B is 100 mL, with a volume ratio of 1:1. The injection volumes for the shallow, intermediate, and deep layers are 45 mL, 35 mL, and 20 mL, respectively, resulting in a continuous, wind-erosion-resistant crust in the shallow layer, a connecting framework in the intermediate layer, and an anchoring structure in the deep layer.

[0077] Move to the next construction site and repeat the previous step. Complete the layered injection operation point by point along the construction path, so that the longitudinal mineralized columns formed at adjacent construction sites overlap each other under the radial diffusion effect, and gradually build a three-dimensional mineralized anchoring network inside the sand body.

[0078] After all construction sites are completed, the treated sand is allowed to solidify under natural conditions. The reaction liquid forms a stable mineralized structure in the pores of the sand, thereby significantly improving the overall stability and wind erosion resistance of the sand.

[0079] The desert sand used was collected from the Tengger Desert in Ningxia. The characteristics of the sand are shown in Table 1 below.

[0080] Table 1

[0081]

[0082] Sand dune-shaped samples were taken and subjected to wind erosion tests (wind speed 30 m / s) at room temperature. Crust thickness and permeability tests were also conducted. The specific results are shown in Table 2 below.

[0083] Table 2

[0084]

[0085] As shown in Table 2 above, with an ion ratio of 1 and a PAA dosage of 3 g / L, at the extreme wind speed (30 m / s), the cementing fluid spraying rate is 5.1 L / m. 2 This treatment can control sediment loss to 10.7%, stabilizing after 10 minutes. The penetration strength of the surface crust is 94.3 kPa. After treatment, the desert sand exhibits excellent wind erosion resistance and forms a high-strength crust on its surface, thus expanding and consuming wind erosion energy.

[0086] Example 2

[0087] Desert sand anti-wind erosion cementing fluid reagent preparation

[0088] The prepared desert sand anti-erosion cementing fluid reagent includes solution A and solution B: solution A is a PAA-CaCl2 solution, and solution B is a Na2CO3 solution. The target mass concentration of PAA in solution A is 4 g / L, and the ion ratio n(CO3) 2- ) / n(Ca 2+ The objective is 1, with the concentration of CaCl2 in solution A being 0.5 mol / L and the concentration of Na2CO3 in solution B being 0.5 mol / L.

[0089] Construction methods for desert sand treatment

[0090] Prepare solution A and solution B according to the above ratio, inject them into separate storage tanks, and connect them to the biomimetic mineralization device.

[0091] (1) The desert sandy area to be treated was surveyed and the construction area was divided into several sub-construction units according to the construction needs. The construction points were arranged in a hexagonal staggered grid with a spacing of 12cm between points. The layered injection depth included a shallow layer of 3cm, a middle layer of 7cm and a deep layer of 12cm.

[0092] The biomimetic mineralization device (single-rod type) is moved to the target construction area, positioning it above the first construction point. Driven by the driving unit, it reaches the preset deep position and delivers the reaction liquid to the mixer at the first end via a dual-liquid independent delivery pipeline. This allows the reaction liquid to mix in situ within the sand mass and diffuse radially towards the surrounding sand, forming the first mineralization consolidation zone. After completing the injection at the first depth, the hollow insertion rod is lifted to the middle layer position by the lifting and guiding unit, and the injection operation is repeated to form the second mineralization consolidation zone. The hollow insertion rod is then lifted to the shallower layer, and the injection operation is performed again to form the third mineralization consolidation zone, thus creating a longitudinally continuous mineralization column unit at the same construction point.

[0093] Instructions for dosage of cementing fluid for layered injection:

[0094] Instructions for the dosage of cementing fluid injected in layers: At a single construction site, the total injection volume of liquid A and liquid B is 100 mL, with a volume ratio of 1:1. The injection volumes for the shallow, intermediate, and deep layers are 45 mL, 35 mL, and 20 mL, respectively, resulting in a continuous, wind-erosion-resistant crust in the shallow layer, a connecting framework in the intermediate layer, and an anchoring structure in the deep layer.

[0095] Move to the next construction site and repeat the previous step. Complete the layered injection operation point by point along the construction path, so that the longitudinal mineralized columns formed at adjacent construction sites overlap each other under the radial diffusion effect, and gradually build a three-dimensional mineralized anchoring network inside the sand body.

[0096] After all construction sites are completed, the treated sand is allowed to solidify under natural conditions. The reaction liquid forms a stable mineralized structure in the pores of the sand, thereby significantly improving the overall stability and wind erosion resistance of the sand.

[0097] The desert sand used was collected from the Tengger Desert in Ningxia. The characteristics of the sand are shown in Table 3 below.

[0098] Table 3

[0099]

[0100] Sand dune-shaped samples were taken and subjected to wind erosion tests at room temperature (wind speed 30 m / s). The crust thickness test and permeability test were the same as in Example 1, and the results are shown in Table 4 below.

[0101] Table 4

[0102]

[0103] As shown in Table 4 above, with an ion ratio of 1 and a PAA dosage of 4 g / L, at the extreme wind speed (30 m / s), the cementing fluid spraying rate is 5.1 L / m. 2This treatment can control sediment loss to 16.6%, stabilizing after 10 minutes. The penetration strength of the surface crust is 88.0 kPa. After treatment, the desert sand exhibits excellent wind erosion resistance and forms a high-strength crust on its surface, thus expanding and consuming wind erosion energy.

[0104] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A construction method for preventing wind erosion in desert sand based on biomimetic mineralization, characterized in that, The construction method includes the following steps: Step A: Set up multiple construction sites in the construction area of ​​the desert region to be treated; Step B: At one of the construction sites, the lifting and guiding unit of the biomimetic mineralization device is used to transport cementing liquid A and cementing liquid B to a first preset depth through independent delivery pipelines, so that cementing liquid A and cementing liquid B are mixed in situ at the first preset depth and diffused radially to the surrounding sand body to form a first mineralization consolidation area. Step C: At the same construction site, the lifting and guiding unit of the biomimetic mineralization device is used to transport cementing liquid A and cementing liquid B to the second preset depth through independent delivery pipelines, so that cementing liquid A and cementing liquid B are mixed in situ at the second preset depth and diffused radially to the surrounding sand body to form a second mineralization consolidation area. Step D: At the same construction site, the lifting and guiding unit of the biomimetic mineralization device is used to transport cementing liquid A and cementing liquid B to the third preset depth through independent delivery pipelines, so that cementing liquid A and cementing liquid B are mixed in situ at the third preset depth and diffused radially to the surrounding sand body to form a third mineralization consolidation area, so as to form a longitudinally continuous mineralization column unit at the same construction site. Step E: Transfer the biomimetic mineralization device to the next construction site and repeat steps B to D to connect multiple mineralization column units to each other in the horizontal direction, forming a three-dimensional mineralization anchoring network structure in the desert sand gaps of the construction area. Wherein, the first preset depth > the second preset depth > the third preset depth; the cementing liquid A includes: a mixed aqueous solution of water-soluble calcium salt and polyacrylic acid; the cementing liquid B includes: an aqueous solution of water-soluble carbonate.

2. The construction method according to claim 1, characterized in that, The first preset depth is 10~14cm, the second preset depth is 6~8cm, and the third preset depth is 2~4cm.

3. The construction method according to claim 1, characterized in that, At one of the construction sites, the total injection volume of the cementing liquid A and the cementing liquid B is 80~100mL, and the volume ratio of the cementing liquid A to the cementing liquid B is 1:

1.

4. The construction method according to claim 1, characterized in that, At one of the construction points, the ratio of the total injection volume of the cementing liquid A and the cementing liquid B at the first preset depth, the second preset depth and the third preset depth is (15~25):(30~40):(40~50).

5. The construction method according to claim 1, characterized in that, The shortest distance between adjacent construction points is 10-15cm, and multiple construction points are arranged in a periodic pattern.

6. The construction method according to any one of claims 1 to 5, characterized in that, The water-soluble calcium salt includes calcium chloride; the water-soluble carbonate includes sodium carbonate.

7. The construction method according to claim 6, characterized in that, The mass concentration of polyacrylic acid in the cementing solution A is 2~4 g / L, the molar concentration of calcium chloride in the cementing solution A is 0.2~0.8 mol / L, and the molar concentration of sodium carbonate in the cementing solution B is 0.2~0.8 mol / L.

8. A biomimetic mineralization device for implementing the construction method for wind erosion prevention of desert sand based on biomimetic mineralization as described in any one of claims 1 to 7, characterized in that, The biomimetic mineralization device includes: The shell has a first end and a second end, the first end having a tapered structure suitable for insertion into the desert region to be treated; The drive unit is installed at the second end of the housing; A lifting guide unit is located at the second end of the housing. The lifting guide unit is adapted to allow the first end of the housing to be lifted and lowered into the sand body of the desert area to be treated, under the drive of the drive unit. A conveying unit is located inside the housing. The conveying unit includes dual-liquid independent conveying pipelines, which are used to convey cementing liquid A and cementing liquid B respectively. An insertion injection unit is fitted inside the housing. The insertion injection unit is adapted to mix and spray cementing liquid A and cementing liquid B from the conveying unit in situ at the first end of the housing when the sand body is inserted, so as to diffuse radially into the surrounding sand body.

9. The biomimetic mineralization device according to claim 8, characterized in that, The lifting guide unit comprises, from top to bottom, the following: Lifting actuator; A lifting guide rail assembly is connected to the lifting actuator, and the lifting guide rail assembly is used to vertically constrain the movement direction of the insertion injection unit; The lifting slide is connected to the lifting actuator via the lifting guide rail assembly; Driven by the lifting actuator, the lifting slide moves up and down along the lifting guide rail assembly to insert the first end of the housing into the preset depth of the sand in the desert area to be treated.

10. The biomimetic mineralization device according to claim 8, characterized in that, The insertion / injection unit comprises, from top to bottom: A hollow insert rod body, in which the dual-liquid independent delivery pipeline is located; A mixer is located above the tapered structure at the first end, and the dual-liquid independent delivery pipeline is connected to the mixer. The mixer is adapted to mix the binder A and the binder B. A drip head, located between the mixer and the tapered structure at the first end, has multiple holes suitable for radially diffusing the mixed cementing solution A and cementing solution B to the surrounding sand body. The biomimetic mineralization device also includes: The mounting base is located near the first end of the housing and is fitted over the housing. The mounting base is suitable for vertically placing the biomimetic mineralization device on the sand body of the desert area to be treated.

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