A bamboo reed-based grass square sand barrier and its construction method and application

Abstract

The application discloses a reed-based grass square sand barrier and a construction method and application thereof, relates to the technical field of wind-sand prevention and treatment, and is composed of a plurality of basic sand prevention units spliced on sandy land, wherein each basic sand prevention unit comprises a modified reed grid body, a surface consolidation layer and a bottom reinforced structure. The reed-based grass square sand barrier has the advantages of significant effects in sand prevention and fixation efficiency, structural stability, durability and full life cycle economy, and the like, through the trinity composite design of the modified reed grid body, the surface consolidation layer and the bottom reinforced structure.

Description

Technical Field

[0001] This invention relates to the field of wind and sand control technology, specifically to a grass checkerboard sand barrier based on reeds and its construction method and application. Background Technology

[0002] Frequent sandstorms in desert regions often lead to problems such as road burial and wind erosion, affecting traffic. Straw checkerboard sand barriers are one of the most effective engineering measures for controlling shifting sand dunes and preventing wind and sand hazards. Traditional straw checkerboard barriers mainly use plant stalks such as reeds, wheat straw, and rice straw, which are buried halfway in the sand and left half exposed on the surface, forming a checkerboard structure. This increases surface roughness, reduces near-surface wind speed, and achieves the purpose of blocking and stabilizing sand.

[0003] However, traditional straw checkerboard sand barriers have the following significant defects: (1) Low material strength and poor durability: Reeds, wheat straw and other materials have weak mechanical properties. Under strong wind and sand erosion and alternating wet and dry conditions, they are prone to rotting, powdering or breaking. Their service life is usually only 2-4 years. (2) Easily buried by sand: In areas with abundant sand sources, straw checkerboards will be quickly buried by sand accumulation. Once the burial depth exceeds the exposed height, their sand-blocking function will fail. Traditional materials cannot be effectively restored after being buried and need to be re-laid, which is costly. (3) Single structural function: Traditional straw checkerboards mainly play a "blocking" role and have limited ability to "fix" surface sand particles.

[0004] While existing technologies have attempted to use other materials (such as plastic netting and clay embankments) for sand control, these methods are either costly, ecologically unfriendly, or complex to construct, and their effectiveness in impeding near-surface windblown sand flows is limited, lacking the ability to fix surface sand particles. Currently, there are no publicly reported protective systems that use reeds as the core material and combine them with long-lasting, liftable, and ecological functions. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a straw checkerboard sand barrier based on reed (Phyllostachys aurea), its construction method, and its application. This solution significantly improves the stability, durability, and overall sand-fixing and sand-control capabilities of the straw checkerboard by modifying the surface of the reed stalks and designing a multi-layered composite structure.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a grass checkerboard sand barrier based on reed.

[0007] The straw checkerboard sand barrier is composed of multiple basic sand-control units pieced together in the sand. Each basic sand-control unit includes: (1) Modified reed mesh: Multiple reed stalks with modified surfaces are laid vertically and cross each other to form a square mesh, and are tied and fixed at all intersections with binding straps; The composite coating provides a long-lasting physical and chemical protective barrier for reed stalks. With paraffin and rosin as the base, its core function is to give reed stalks excellent hydrophobicity and resistance to biological corrosion, which essentially delays the mold and decay caused by moisture absorption. At the same time, the added nano silica is designed to significantly enhance the hardness and wear resistance of the coating surface to resist long-term erosion by wind and sand.

[0008] (2) Surface consolidation layer: a bio-based sand-fixing agent layer that is sprayed and penetrated into the modified reed grid and the sandy surface it surrounds; the bio-based sand-fixing agent is formed by a cross-linking reaction of a solution containing konjac glucomannan, sodium alginate and calcium chloride; In bio-based sand-fixing agents, konjac glucomannan and sodium alginate, as natural polymeric cementing materials, can rapidly undergo ionic cross-linking reactions when they encounter calcium chloride, which acts as a cross-linking agent, forming a three-dimensional network structure. This process can solidify loose, flowing surface sand particles into a unified whole with initial strength, thereby effectively inhibiting the initiation and movement of sand particles and achieving wind erosion control on the sandy surface.

[0009] (3) Bottom reinforcement structure: a layer of biodegradable fiber mesh is laid flat on the sandy surface and located below the modified reed mesh. The lower part of the reed stalk passes through the mesh of the fiber mesh and is buried in the sand.

[0010] In the integrated "three-in-one" structure, the three components form a close synergistic and reinforcing relationship: the modified reed mesh acts as the system's "rigid skeleton," forming a physical barrier against wind and sand flow, and is the core of the sand barrier's morphological stability and its blocking function. The surface consolidation layer acts as a "reinforced skin" covering the skeleton and sand surface, consolidating the loose sand grains and the "skeleton" itself into a more robust whole, jointly resisting the shearing and erosion of wind and sand flow. The bottom reinforcement structure acts as a deep-rooted "anchoring root system," firmly anchoring the "skeleton" in the sand, preventing it from overturning or shifting as a whole, and ensuring its integrity during vertical lifting.

[0011] Preferably, the modification treatment involves coating the surface of the reed stalk with a composite coating. The composite coating is prepared by the following method: 40-60 parts by weight of paraffin wax and 20-30 parts by weight of rosin are heated and melted at 85-95°C, stirred evenly, and then 5-10 parts by weight of nano-silica and 1-3 parts by weight of silane coupling agent are added, and the mixture is continuously stirred until a uniform melt is formed. The composite coating is applied to the surface of the reed stalk by dipping or spraying, and the coating amount is such that the dry weight of the coating accounts for 5%-10% of the weight of the reed stalk.

[0012] Preferably, the bio-based sand-fixing agent is prepared and used as follows: 1-2 parts by weight of konjac glucomannan and 0.5-1.5 parts by weight of sodium alginate are dissolved in 96.5-98.5 parts by weight of water to form mixture A; 0.5-1.5 parts by weight of calcium chloride are dissolved in an equal volume of water to form solution B; during construction, mixture A and solution B are mixed at a volume ratio of 1:1 and immediately sprayed onto the sandy surface at a spraying rate of 1.5-2.5 L / m². 2 .

[0013] Preferably, the biodegradable fiber web is a woven jute fiber web or coconut shell fiber web, with a basis weight of 300~500 g / m². 2 The mesh size is 2cm×2cm to 4cm×4cm; during installation, the fiber mesh is laid flat on the sand surface and adheres tightly to the sand surface.

[0014] Preferably, the square grid is 1m × 1m in size; the binding strap is a plastic cable tie or a biodegradable hemp rope; when fixing the intersection, the binding strap is wrapped around the intersection of the mutually perpendicular reed stalks and tied tightly.

[0015] Secondly, the present invention provides a construction method for the above-mentioned grass checkerboard sand barrier based on reed, comprising the following steps: S1: Material pretreatment: Cut the reed stalks to the predetermined length, apply a composite coating to their surface by impregnation or spraying and then cure it to complete the modification treatment; prepare a biodegradable fiber net; prepare a mixture A and a solution B of the bio-based sand-fixing agent respectively; S2: Laying out lines and digging trenches: On a flat sandy surface, draw grid lines with sides of 1m; dig trenches with a depth of 15-20cm along the drawn grid lines. S3: Laying the reinforcement layer and uprights: The biodegradable fiber mesh is laid on the sandy surface. The reeds modified in step S1 are placed closely together and vertically into the trench dug in step S2, so that the reeds are arranged along the grid lines and the lower part of the reeds passes through the mesh of the fiber mesh. S4: Backfilling and fixing: Backfill the trench with sand and compact it to ensure that the reed poles stand upright and are stable, while pressing the fiber net tightly to the sandy surface. S5: Constructing the reed grid: At all adjacent intersections of the reed stalks that have been backfilled and compacted in step S4, use binding straps to tie and fix them to form a stable 1m×1m square grid. S6: Forming a surface consolidation layer: Mix the mixture A prepared in step S1 with solution B at a volume ratio of 1:1 to form a bio-based sand-fixing agent. Immediately afterward, use a spraying device to evenly spray the mixture onto the erected reed grid and the sand surface it surrounds, allowing it to penetrate and cross-link to form a surface consolidation layer.

[0016] Preferably, in step S1, the length of the reed stalk is 40-50cm; the coating amount of the composite coating is such that the dry weight of the coating accounts for 5% to 10% of the weight of the reed stalk.

[0017] Preferably, in step S6, the spraying amount of the bio-based sand-fixing agent is 1.5-2.5 L / m². 2 .

[0018] Thirdly, the present invention provides an application of the above-mentioned grass checkerboard sand barrier based on reed in windbreak and sand fixation projects in areas such as desert highways, mining areas or oasis edges.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, based on the reed-covered bamboo checkerboard sand barrier, utilizes a three-in-one composite design of "modified reed-covered bamboo grid + surface consolidation layer + bottom reinforcement structure," demonstrating significant beneficial effects in terms of sand control and fixation efficiency, structural stability, durability, and overall life-cycle economics. Specifically: (1) In terms of sand prevention and fixation effectiveness, this invention achieves the organic combination of physical sand blocking and chemical sand fixation through material modification and structural innovation, forming a three-dimensional protection system with synergistic effect. Its sand prevention and fixation effect far exceeds that of traditional straw grids, effectively overcoming the problems of single structure and weak sand fixation ability of traditional straw grids.

[0020] (2) In terms of stability and reusability, based on the physical properties of reed poles—large diameter, high hardness, and resistance to wind erosion—and the reinforcement effect of the bottom fiber mesh, efficient vertical lifting and repositioning of sand barriers after burial is achieved. The lifting process is unbroken and loose, the structural integrity is well maintained, the sand-proof function is restored immediately, and the maintenance efficiency is more than 5 times higher than that of traditional repaving, fundamentally solving the problem that traditional grass grids are easily buried by sand and fail.

[0021] (3) In terms of durability, the modified reed stalks have significantly improved water resistance and abrasion resistance thanks to the composite coating treatment; combined with the surface consolidation layer formed by the bio-based sand-fixing agent, the development of wind erosion pits and sand surface erosion are effectively inhibited. The entire system is estimated to have an effective service life of 6-8 years, far exceeding the 3-5 years of traditional reed grids, thus achieving long-term and stable sand-fixing function.

[0022] (4) In terms of economics, Reed is a local plantation material in Alar, with short transportation distance and low cost, which gives it a natural cost advantage compared to Reed, which requires long-distance transportation. In addition, its low unit consumption, reusability, and long service life can save on material and maintenance costs throughout its entire life cycle, resulting in significant economic benefits.

[0023] (5) All bio-based / degradable environmental protection characteristics: The composite coating, sand-fixing agent and fiber mesh are mainly derived from natural renewable plant and animal extracts or fibers, which are environmentally friendly and in line with the concept of ecological desertification control.

[0024] In summary, this invention not only effectively solves the problems of low strength, easy burial by sand, short lifespan, and single function of traditional straw checkerboard materials, but also constructs a new type of sand barrier system that combines high efficiency in sand prevention, reusability, long-term durability, environmental protection, and full-cycle economic benefits through the integration of material modification, structural innovation, and ecological processes, providing a comprehensive solution that can be promoted for wind and sand control. Detailed Implementation

[0025] To make the objectives and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0026] Unless otherwise specified, the instruments, reagents, and materials used in the following embodiments are all conventional instruments, reagents, and materials already available in the prior art and can be obtained through legitimate commercial channels. Unless otherwise specified, the experimental methods and detection methods used in the following embodiments are all conventional experimental methods and detection methods already available in the prior art.

[0027] In the following embodiments, the experiment was conducted on the desert section of G580 highway from K224+000 to K364, managed by the Alar Maintenance Station. Specifically, the construction site was a sand dune at K255+900, which was close to the parking area for easy observation. Furthermore, the location was high, windy, and the sand control facilities were completely damaged, making this location a better opportunity to verify the sand control effect. The reed used was brand Oasis No. 1, produced in the 10th Regiment of Alar.

[0028] Example 1 This embodiment provides a straw checkerboard sand barrier based on reed, which is composed of multiple basic sand control units spliced ​​together in sandy land. Each basic sand control unit includes: (1) Modified reed mesh: Multiple reed stalks with modified surfaces are laid vertically and cross each other to form a 1m×1m square mesh, and all intersections are tied and fixed with binding straps (plastic cable ties); The modification treatment involves coating the surface of the reed stalk with a composite coating, which is prepared by the following method: 40 parts by weight of paraffin and 20 parts by weight of rosin are heated and melted at 85°C, stirred evenly, and then 5 parts by weight of nano-silica and 1 part by weight of silane coupling agent (KH-550) are added. The mixture is stirred continuously at 2000 r / min for 30 min until a uniform melt is formed.

[0029] (2) Surface consolidation layer: a bio-based sand-fixing agent layer that is sprayed and penetrated into the modified reed grid and the sandy surface it surrounds; the bio-based sand-fixing agent is formed by a cross-linking reaction of a solution containing konjac glucomannan, sodium alginate and calcium chloride; The bio-based sand-fixing agent is prepared and used in the following manner: by weight, 1 part of konjac glucomannan and 0.5 parts of sodium alginate are dissolved in 98.5 parts of water to form a mixture A; 0.5 parts of calcium chloride are dissolved in an equal amount of water to form a solution B; during construction, mixture A and solution B are mixed at a volume ratio of 1:1 and then immediately sprayed onto the sandy surface.

[0030] (3) Bottom reinforcement structure: a layer of biodegradable fiber mesh (machine-woven jute fiber mesh, weight 500g / m²) is laid flat on the sandy surface and located below the modified reed mesh. 2 (The mesh size is 2cm×2cm). The lower part of the reed stalk passes through the mesh of the fiber net and is buried in the sand.

[0031] The construction method of this grass checkerboard sand barrier includes the following steps: S1: Material pretreatment: Cut the reed stalks to a predetermined length of 40cm, apply a composite coating to the surface by impregnation (the coating amount is 5% of the dry weight of the reed stalks) and cure it to complete the modification treatment; prepare biodegradable fiber net; prepare mixture A and solution B of bio-based sand-fixing agent respectively. S2: Laying out lines and digging trenches: On a flat sandy surface, draw grid lines with sides of 1m; dig trenches with a depth of 15cm along the drawn grid lines. S3: Laying the reinforcement layer and uprights: Lay the biodegradable fiber mesh on the sandy surface, and place the reed poles modified in step S1 closely adjacent to each other and vertically into the trench dug in step S2, so that the reed poles are arranged along the grid lines and the lower part of the reed poles passes through the mesh of the fiber mesh. S4: Backfilling and fixing: Backfill the trench with sand and compact it to ensure that the reed poles stand upright and are stable, while pressing the fiber net tightly to the sandy surface. S5: Constructing the reed grid: At all adjacent intersections of the reed stalks that have been backfilled and compacted in step S4, use binding straps to tie and fix them to form a stable 1m×1m square grid. S6: Forming a surface consolidation layer: After mixing the mixture A prepared in step S1 with solution B at a volume ratio of 1:1 to form a bio-based sand-fixing agent, immediately spray it evenly onto the erected reed grid and the sand surface it surrounds using a spraying device. The spraying amount is 1.5 L / m². 2 This allows it to penetrate and cross-link to form a surface solidified layer.

[0032] Example 2 This embodiment provides a straw checkerboard sand barrier based on reed, which is composed of multiple basic sand control units spliced ​​together in sandy land. Each basic sand control unit includes: (1) Modified reed mesh: Multiple reed stalks with modified surfaces are laid vertically and cross each other to form a 1m×1m square mesh, and all intersections are tied and fixed with binding straps (plastic cable ties); The modification treatment involves coating the surface of the reed stalk with a composite coating, which is prepared by the following method: 50 parts by weight of paraffin wax and 25 parts by weight of rosin are heated and melted at 90°C, stirred until homogeneous, then 8 parts by weight of nano-silica and 2 parts by weight of silane coupling agent are added, and stirring continues until a homogeneous melt is formed. (2) Surface consolidation layer: a bio-based sand-fixing agent layer that is sprayed and penetrated into the modified reed grid and the sandy surface it surrounds; the bio-based sand-fixing agent is formed by a cross-linking reaction of a solution containing konjac glucomannan, sodium alginate and calcium chloride; The bio-based sand-fixing agent is prepared and used in the following manner: by weight, 1.5 parts of konjac glucomannan and 1 part of sodium alginate are dissolved in 97.5 parts of water to form a mixture A; 1 part of calcium chloride is dissolved in an equal amount of water to form a solution B; during construction, mixture A and solution B are mixed at a volume ratio of 1:1 and then immediately sprayed onto the sandy surface.

[0033] (3) Bottom reinforcement structure: a layer of biodegradable fiber mesh (machine-woven coconut fiber mesh, weight 400g / m²) is laid flat on the sandy surface and located below the modified reed mesh. 2 (The mesh size is 3cm×3cm). The lower part of the reed stalk passes through the mesh of the fiber net and is buried in the sand.

[0034] The construction method of this grass checkerboard sand barrier includes the following steps: S1: Material pretreatment: Cut the reed stalks to a predetermined length of 45cm, apply a composite coating to the surface by spraying (the coating amount is 8% of the dry weight of the reed stalks) and cure it to complete the modification treatment; prepare biodegradable fiber net; prepare mixture A and solution B of bio-based sand-fixing agent respectively. S2: Laying out lines and digging trenches: On a flat sandy surface, draw grid lines with sides of 1m; dig trenches with a depth of 18cm along the drawn grid lines. S3: Laying the reinforcement layer and uprights: Lay the biodegradable fiber mesh on the sandy surface, and place the reed poles modified in step S1 closely adjacent to each other and vertically into the trench dug in step S2, so that the reed poles are arranged along the grid lines and the lower part of the reed poles passes through the mesh of the fiber mesh. S4: Backfilling and fixing: Backfill the trench with sand and compact it to ensure that the reed poles stand upright and are stable, while pressing the fiber net tightly to the sandy surface. S5: Constructing the reed grid: At all adjacent intersections of the reed stalks that have been backfilled and compacted in step S4, use binding straps to tie and fix them to form a stable 1m×1m square grid. S6: Formation of the surface consolidation layer: After mixing the mixture A prepared in step S1 with solution B at a volume ratio of 1:1 to form a bio-based sand-fixing agent, immediately spray it evenly onto the erected reed grid and the sand surface it surrounds using a spraying device. The spraying amount is 2.0 L / m². 2 This allows it to penetrate and cross-link to form a surface solidified layer.

[0035] Example 3 This embodiment provides a straw checkerboard sand barrier based on reed, which is composed of multiple basic sand control units spliced ​​together in sandy land. Each basic sand control unit includes: (1) Modified Reed Grid: Multiple Reed stalks with modified surfaces are laid vertically in a 1m×1m square grid, and all intersections are tied and fixed with binding straps (biodegradable hemp rope); The modification treatment involves coating the surface of the reed stalk with a composite coating, which is prepared by the following method: 60 parts by weight of paraffin and 30 parts by weight of rosin are heated and melted at 95°C, stirred until homogeneous, then 10 parts by weight of nano-silica and 3 parts by weight of silane coupling agent are added, and stirring continues until a homogeneous melt is formed. (2) Surface consolidation layer: a bio-based sand-fixing agent layer that is sprayed and penetrated into the modified reed grid and the sandy surface it surrounds; the bio-based sand-fixing agent is formed by a cross-linking reaction of a solution containing konjac glucomannan, sodium alginate and calcium chloride; The bio-based sand-fixing agent is prepared and used as follows: by weight, 2 parts of konjac glucomannan and 1.5 parts of sodium alginate are dissolved in 96.5 parts of water to form a mixture A; 1.5 parts of calcium chloride are dissolved in an equal amount of water to form a solution B; during construction, mixture A and solution B are mixed at a volume ratio of 1:1 and then immediately sprayed onto the sandy surface.

[0036] (3) Bottom reinforcement structure: a layer of biodegradable fiber mesh (machine-woven coconut fiber mesh, weight 300g / m²) is laid flat on the sandy surface and located below the modified reed mesh. 2 (The mesh size is 4cm×4cm). The lower part of the reed stalk passes through the mesh of the fiber net and is buried in the sand.

[0037] The construction method of this grass checkerboard sand barrier includes the following steps: S1: Material pretreatment: Cut the reed stalks to a predetermined length of 50cm, apply a composite coating to their surface by spraying (the coating amount is 10% of the dry weight of the reed stalks) and cure it to complete the modification treatment; prepare biodegradable fiber net; prepare mixture A and solution B of bio-based sand-fixing agent respectively. S2: Laying out lines and digging trenches: On a flat sandy surface, draw grid lines with sides of 1m; dig trenches with a depth of 20cm along the drawn grid lines. S3: Laying the reinforcement layer and uprights: Lay the biodegradable fiber mesh on the sandy surface, and place the reed poles modified in step S1 closely adjacent to each other and vertically into the trench dug in step S2, so that the reed poles are arranged along the grid lines and the lower part of the reed poles passes through the mesh of the fiber mesh. S4: Backfilling and fixing: Backfill the trench with sand and compact it to ensure that the reed poles stand upright and are stable, while pressing the fiber net tightly to the sandy surface. S5: Constructing the reed grid: At all adjacent intersections of the reed stalks that have been backfilled and compacted in step S4, use binding straps to tie and fix them to form a stable 1m×1m square grid. S6: Forming a surface consolidation layer: After mixing the mixture A prepared in step S1 with solution B at a volume ratio of 1:1 to form a bio-based sand-fixing agent, immediately spray it evenly onto the erected reed grid and the sand surface it surrounds using a spraying device. The spraying amount is 2.5 L / m². 2 This allows it to penetrate and cross-link to form a surface solidified layer.

[0038] Experimental Example 1: Performance Testing of Composite Coatings Performance tests were conducted on both the unmodified Reed spp. and the Reed spp. modified with composite coatings as described in Examples 1-3. The results are as follows: (1) Water resistance test: The reed stalk samples before and after modification were completely immersed in clean water for 30 days. The results showed that the mass of the unmodified reed stalk increased by 18.5% (high water absorption), the surface turned black, and obvious mold spots appeared; while the mass of the modified reed stalks in Examples 1-3 increased by 2.6%, 2.1% and 2.2% respectively, with no obvious changes on the surface and no mold spots, proving that its hydrophobic and anti-corrosion properties were significantly improved.

[0039] (2) Abrasion resistance test: A sandblasting simulation test was conducted (wind speed 15m / s, sand flux 200g / cm³). 2 The time required for the modified reed stalks in Examples 1-3 to reach a mass loss rate of 10% is 145h, 158h, and 154h, respectively; while the time required for the unmodified reed stalks is 75h.

[0040] The test results above show that the water resistance, corrosion resistance, wear resistance, and wind erosion resistance of reed stalks are greatly improved after the composite coating modification.

[0041] Experiment Example 2: Verification of the Consolidation Effect of Bio-based Sand-fixing Agent Standard sand was filled into identical test sandboxes (1m×1m). The experimental groups were sprayed with the bio-based sand-fixing agents prepared in Examples 1-3, while the control group was not sprayed with any sand-fixing agent. The sand surfaces of the experimental and control groups were eroded for 15 minutes using a portable wind tunnel (outlet wind speed 12m / s), and the erosion depth and surface hardness were measured (using a soil hardness meter).

[0042] The results showed that the wind erosion depth of the control group was 8.5 cm, and the surface was loose. In contrast, the wind erosion depths of Examples 1-3 were 0.7 cm, 0.5 cm, and 0.6 cm, respectively, with surface hardness of 16.4 N / cm². 2 18.6 N / cm 2 18.5 N / cm 2 The results show that the bio-based sand-fixing agents of Examples 1-3 can effectively solidify the sand surface, significantly reduce the depth of wind erosion, and form a shell with a certain degree of hardness.

[0043] Comparative Example 1 Only the reed lattice treated with the coating of Example 2 is laid (without sand-fixing agent and without fiber net).

[0044] Comparative Example 2 The sand-fixing agent of Example 2 formulation was sprayed only on the surface of the sand (without reed mesh or fiber mesh).

[0045] Comparative Example 3 The biodegradable fiber mesh of Example 2 (without reed mesh or sand-fixing agent) was laid only on the surface of the sand.

[0046] Comparative Example 4 Blank control (sand without any treatment).

[0047] Experiment Example 3: Comprehensive Performance Evaluation of a Complete Sand Barrier System (1) Verification of sand prevention and sand fixation effectiveness Sand barriers were set up in seven test areas (10m×10m) according to the methods of Examples 1-3 and Comparative Examples 1-4 described above. The evaluation indicators and methods are as follows, and the results are shown in Table 1.

[0048] Initial wind protection efficiency: The percentage reduction in wind speed near the ground (20cm height) at a distance of approximately 1.5m downwind from the sand barrier compared to an open area.

[0049] Wind erosion resistance: After experiencing a typical sandstorm (lasting 6 hours, with an average wind speed of 18 m / s), the average wind erosion depth of each test area was measured.

[0050] Table 1 Comprehensive Performance Evaluation

[0051] As shown in Table 1, the straw checkerboard sand barriers of Examples 1-3 are significantly superior to those of Comparative Examples 1-4 in terms of windbreak efficiency and wind erosion resistance. Specifically, Examples 1-3 achieve a wind speed reduction rate of 70%-76% and a wind erosion depth of only 0.5-0.7 cm, while Comparative Example 1 (reed mesh only), which has the best effect among Comparative Examples 1-4, has a wind speed reduction rate of 65% and a wind erosion depth of 3.2 cm. Comparative Examples 2 (sand-fixing agent only) and 3 (fiber mesh only) are even less effective. This indicates that Examples 1-3 achieve superior sand control and fixation efficiency through comprehensive measures.

[0052] Further analysis of the relative improvement values ​​(results of each embodiment and comparative example minus the result of comparative example 4): the relative improvement values ​​of wind speed reduction rate in embodiments 1-3 are greater than the sum of the improvement values ​​of comparative examples 1-3, while the relative improvement values ​​of wind erosion depth in embodiments 1-3 are less than the sum of the improvement values ​​of comparative examples 1-3. This fully demonstrates that the combination of "modified reed mesh + surface consolidation layer (bio-based sand-fixing agent) + bottom reinforcement structure (biodegradable fiber mesh)" produces a significant synergistic enhancement effect (1+1+1>3), with each component complementing each other and jointly improving the overall performance of the system.

[0053] (2) Stability and Lifting Reuse Validation After a windy season (8 months) of on-site testing, approximately 30% of the sand barrier units in Examples 1-3 were buried by wind-blown sand for 10-15 cm. During the initial lifting operation, maintenance personnel directly lifted the exposed tops of the reeds. With the reinforcement of the biodegradable fiber mesh at the bottom and the compaction effect of the backfilled sand, the entire grid was lifted intact and smoothly to its original design height. Post-lift inspection showed no broken reeds or loose binding points, the sand barrier structure maintained its integrity, and its sand-prevention function was immediately restored. This process required no material replacement, and the labor efficiency was more than 5 times higher than traditional relaiding. Furthermore, the wear-resistant and corrosion-resistant properties of the modified reeds (as shown in Example 1) ensured their mechanical strength during the lifting process, while the surface consolidation layer formed by the bio-based sand-fixing agent further enhanced the integrity of the sand mass, preventing sand collapse during the lifting process. The bottom fiber mesh not only prevents erosion of the trench sidewalls, but also provides anchoring points for the reed poles through its mesh structure, thereby enabling the sand barrier to be quickly reset and stabilized in the long term.

[0054] (3) Durability prediction Field observations showed that, due to the presence of the surface consolidation layer, the sand surface inside the grid was smooth and free of wind erosion pits; the bottom fiber mesh effectively inhibited sidewall erosion, improving the overall stability of the system. Combined with the significant improvement in water resistance and abrasion resistance of the reed stalks by the composite coating in Experiment 1, and the shell hardness formed by the bio-based sand-fixing agent in Experiment 2, this sand barrier system exhibits excellent performance in weather resistance, wind erosion resistance, and biodegradation resistance. Considering the durability, reusability, and synergistic effects of the modified reeds, the system's effective service life is estimated to be 6-8 years, far exceeding that of traditional reed grids (3-5 years), demonstrating its significant advantage in long-term sand control.

[0055] (4) Cost and economic analysis This embodiment of the reed-based checkerboard sand barrier exhibits significant cost advantages throughout its entire lifecycle. Compared to traditional cotton stalk checkerboards, its process is much simpler: cotton stalk checkerboards require harvesting cotton stalks, manual binding (forming a 10-15 cm diameter grid), and long-distance transportation to the site for installation, making the process complex; although it can be lifted, the thin stalks are easily buried, and long-term exposure to sun and wind erosion leads to poor lifting performance, and horizontal lifting easily causes breakage and loosening. Reed, on the other hand, has high hardness, thick stalks, and is resistant to wind erosion; it is not easily broken when lifted vertically and maintains good sand-prevention function after lifting, greatly reducing maintenance difficulty and material waste. Compared to reed checkerboards, reeds need to be transported from Korla Bohu, costing 1200 yuan / ton, plus approximately 300 yuan / ton for transportation to Aksu, resulting in a total unit price of 1500 yuan / ton; while reed is a locally grown product of Alar, with high yield and short transportation distance, resulting in a total unit price of 1300 yuan / ton. The unit usage of reed straw checkerboard is 1.2 kg / m², while that of Phragmites australis checkerboard is only 1.1 kg / m², resulting in a material cost saving of approximately 13%. Furthermore, reed straw checkerboard typically has a lifespan of 3-5 years and is prone to failure due to burial and wind erosion; while Phragmites australis stems are rich in cellulose and lignin, possessing excellent weather resistance, and its straw checkerboard can provide sand control for 6-8 years. If the extended service life and the ability to be reused (estimated to add at least 3 years to the service life) are taken into account, maintenance and replacement costs can be further reduced, resulting in significant overall economic benefits and fully demonstrating its comprehensive advantages of "locally sourced materials, long-term reuse, and cost reduction throughout the entire lifecycle."

[0056] The above description is only a preferred embodiment of the present invention and is 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 straw checkerboard sand barrier based on reed, composed of multiple basic sand-control units spliced ​​together in sandy land, characterized in that: Each of the basic sand-control units includes: Modified reed mesh: Multiple reed stalks with modified surfaces are laid vertically and intersected to form a square mesh, and tied and fixed at all intersections with binding straps; Surface consolidation layer: a bio-based sand-fixing agent layer sprayed and penetrated into the modified reed grid and the surface of the sandy land it surrounds; the bio-based sand-fixing agent is formed by a cross-linking reaction of a solution containing konjac glucomannan, sodium alginate and calcium chloride; Bottom reinforcement structure: a layer of biodegradable fiber mesh laid flat on the sandy surface and located below the modified reed mesh, with the lower part of the reed stalk passing through the mesh of the fiber mesh and buried in the sand.

2. The straw checkerboard sand barrier based on reed as described in claim 1, characterized in that: The modification treatment involves coating the surface of the reed stalk with a composite coating. The composite coating is prepared by the following method: 40-60 parts by weight of paraffin wax and 20-30 parts by weight of rosin are heated and melted at 85-95°C, stirred evenly, and then 5-10 parts by weight of nano-silica and 1-3 parts by weight of silane coupling agent are added, and the mixture is stirred continuously until a uniform melt is formed. The composite coating is applied to the surface of the reed stalk by dipping or spraying, and the coating amount is such that the dry weight of the coating accounts for 5%-10% of the weight of the reed stalk.

3. A grass checkerboard sand barrier based on reed as described in claim 1, characterized in that: The bio-based sand-fixing agent is prepared and used as follows: Dissolve 1-2 parts by weight of konjac glucomannan and 0.5-1.5 parts by weight of sodium alginate in 96.5-98.5 parts by weight of water to form mixture A; dissolve 0.5-1.5 parts by weight of calcium chloride in an equal volume of water to form solution B; during construction, mix mixture A and solution B at a volume ratio of 1:1, and immediately spray the mixture onto the sandy surface at a spraying rate of 1.5-2.5 L / m². 2 .

4. A grass checkerboard sand barrier based on reed as described in claim 1, characterized in that: The biodegradable fiber web is a woven jute fiber web or coconut shell fiber web, with a basis weight of 300~500 g / m². 2 The mesh size is 2cm×2cm to 4cm×4cm; during installation, the fiber mesh is laid flat on the sand surface and adheres tightly to the sand surface.

5. A grass checkerboard sand barrier based on reed as described in claim 1, characterized in that: The square grid is 1m x 1m in size; the binding strap is a plastic cable tie or biodegradable hemp rope; when fixing the intersection, the binding strap is wrapped around the intersection of the perpendicular reed stalks and tied tightly.

6. A construction method for a straw checkerboard sand barrier based on reed as described in any one of claims 1-5, characterized in that: Includes the following steps: S1: Material pretreatment: Cut the reed stalks to the predetermined length, apply a composite coating to their surface by impregnation or spraying and then cure it to complete the modification treatment; Prepare biodegradable fiber netting; prepare mixed solution A and solution B of bio-based sand-fixing agent respectively; S2: Laying out lines and digging trenches: On a flat sandy surface, draw grid lines with sides of 1m; dig trenches with a depth of 15-20cm along the drawn grid lines. S3: Laying the reinforcement layer and uprights: The biodegradable fiber mesh is laid on the sandy surface. The reeds modified in step S1 are placed closely together and vertically into the trench dug in step S2, so that the reeds are arranged along the grid lines and the lower part of the reeds passes through the mesh of the fiber mesh. S4: Backfilling and fixing: Backfill the trench with sand and compact it to ensure that the reed poles stand upright and are stable, while pressing the fiber net tightly to the sandy surface. S5: Constructing the reed grid: At all adjacent intersections of the reed stalks that have been backfilled and compacted in step S4, use binding straps to tie and fix them to form a stable 1m×1m square grid. S6: Forming a surface consolidation layer: Mix the mixture A prepared in step S1 with solution B at a volume ratio of 1:1 to form a bio-based sand-fixing agent. Immediately afterward, use a spraying device to evenly spray the mixture onto the erected reed grid and the sand surface it surrounds, allowing it to penetrate and cross-link to form a surface consolidation layer.

7. The construction method according to claim 6, characterized in that: In step S1, the length of the reed stalk is 40-50cm; the coating amount of the composite coating is such that the dry weight of the coating accounts for 5% to 10% of the weight of the reed stalk.

8. The construction method according to claim 6, characterized in that: In step S6, the spraying amount of the bio-based sand-fixing agent is 1.5-2.5 L / m². 2 .

9. The application of a grass checkerboard sand barrier based on reed as described in any one of claims 1-5 in windbreak and sand fixation projects in areas such as desert highways, mining areas, or oasis edges.

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