Plant fiber geomembrane composite sand barrier and construction method thereof

Abstract

The invention discloses a plant fiber geomembrane composite sand barrier and a construction method thereof, and relates to the technical field of desertification control and sandstorm engineering.The plant fiber geomembrane composite sand barrier comprises a sand blocking part which is composed of a plurality of sand barrier units vertically arranged on the surface of a sand dune; the base protection layer is composed of a flexible felt pad made of plant fibers and is laid on the surface of a sand dune below the sand blocking part, the edge of the base protection layer extends to the outsides of the windward side and the leeward side of the sand blocking part, and the sand blocking part penetrates through the base protection layer and is fixed in a sand body below the base protection layer; the base protection layer can be biodegraded in the natural environment after completing the sand stabilization function; the reinforcing part is installed on the outer side of the periphery of the sand blocking part, and the reinforcing part is made of a high-molecular polymer material and attached to the surface of a sand dune. The geomembrane protection layer is additionally arranged at the bottom of the sand barrier, loose sand grain surfaces are bundled into a whole, the wind erosion resistance of a substrate material is enhanced, and the sand dune is prevented from falling off; therefore, overturning and damage of the sand barrier due to suspension of the bottom are avoided.

Description

Technical Field

[0001] This invention relates to the field of desertification control and wind erosion engineering technology, specifically to plant fiber geomembrane composite sand barriers and their construction methods. Background Technology

[0002] Currently, mechanical sand barriers are one of the most widely used technologies in the management of shifting sand dunes. Common mechanical sand barriers include straw checkerboard sand barriers, clay sand barriers, tall vertical sand barriers, and mesh or grid-like sand barriers made of materials such as polyethylene and polypropylene. These sand barriers effectively reduce surface wind speed, block and fix shifting sand, and create conditions for plant growth by changing the roughness of the underlying surface, thereby achieving the goal of long-term sand fixation.

[0003] However, existing sand barriers, especially straw checkerboard and plastic mesh barriers, still have certain limitations in dealing with extreme wind and sand environments. For example, in areas with strong winds and highly mobile sand, the airflow can severely erode the bottom and windward side of the sand barrier, causing cavities to form in the lower part of the barrier. The upper structure loses support and collapses or is damaged. This "erosion damage" phenomenon significantly shortens the effective service life of the sand barrier, increases maintenance costs, and may even lead to partial failure of the sand fixation project. Summary of the Invention

[0004] The purpose of this invention is to provide a plant fiber geomembrane composite sand barrier and its construction method to solve the problems in the prior art where the sand at the base of the sand barrier is easily eroded by airflow under strong winds, leading to instability, overturning or premature damage of the sand barrier structure.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] First aspect: plant fiber geomembrane composite sand barrier, including sand-blocking part, which is composed of multiple sand barrier units erected on the surface of sand dunes;

[0007] The base protection layer is made of a flexible felt mat made of plant fibers and is laid on the surface of the sand dune below the sand-blocking part. The edge of the base protection layer extends to the outside of the windward and leeward sides of the sand-blocking part. The sand-blocking part passes through the base protection layer and is fixed in the sand body below it. The base protection layer can be biodegraded in the natural environment after completing its sand-fixing function.

[0008] The reinforcing part is installed around the outer perimeter of the sand-blocking part. The reinforcing part is made of a membrane material made of polymer and is attached to the surface of the sand dune. The top of the reinforcing part is provided with a sandbag for storing sand near the edge. The sandbag presses the reinforcing part onto the surface of the sand dune.

[0009] Furthermore, the plant fiber of the base protective layer is made of one or more of straw fiber, reed fiber, palm fiber, or hemp fiber.

[0010] Furthermore, the base protective layer is a fiber felt, non-woven fabric, or woven mat with tensile strength, produced by mechanical rolling, needle punching, or weaving processes, with a unit area mass of 300 g / m². 2 Up to 800g / m 2 The thickness of the base protective layer is 3mm to 10mm.

[0011] Furthermore, the base protective layer is mixed with plant seeds or soil water-retaining agents, and the minimum distance from the edge of the base protective layer to the boundary of the sand-blocking part is 20 cm to 50 cm.

[0012] Furthermore, the sand-blocking part is a grass checkerboard sand barrier, a branch sand barrier, or a mesh sand barrier made of biodegradable plastic.

[0013] Furthermore, in the row direction of the sand-blocking section, the top of the side wall shared by adjacent sand barrier units is provided with vertical mounting holes at intervals. The mounting holes are provided with vertical insertion rods that pass through the base protective layer, and the bottom of the insertion rods is inserted into the sand dunes.

[0014] Furthermore, a transverse stop bar is provided between adjacent insertion rods, and the two ends of the stop bar are respectively fixedly connected to the insertion rod. Each insertion rod is symmetrically provided with positioning rings distributed vertically. The positioning rings are movably fitted into the bottom of the insertion rod and located below the stop bar. A stabilizing plate is provided between adjacent insertion rods, and the two ends of the stabilizing plate are respectively fixedly connected to the positioning rings fitted on the adjacent insertion rods. The stabilizing plate is inserted into the sand dune.

[0015] The second aspect: As mentioned in the first aspect above, the construction method of the plant fiber geomembrane composite sand barrier includes the following steps:

[0016] S1: Level the surface of the sand dunes in the planned area, mark the locations where sand-blocking sections need to be constructed, place the positioning rings on the stabilizing plate onto the insert rods, and abut the top of the stabilizing plate against the stop strips. Insert the stabilizing plate and insert rods downwards to the appropriate depth in the sand dunes.

[0017] S2: Lay plant fiber felt mats on the leveled sand dune surface to form a base protective layer, and use bamboo or wooden U-shaped nails to fix the edges and seams of the felt mats.

[0018] S3: On top of the laid plant fiber felt, construct a sand barrier unit to form a sand-blocking part, so that the part of the pole exposed on the surface of the sand dune passes through the installation hole on the sand barrier unit. The side walls of the sand-blocking part are equipped with reinforcements, and sandbags are covered on the reinforcements.

[0019] S4: Backfill the sand excavated during the construction of the sand-blocking section to the base of the sand barrier unit and compact it.

[0020] Furthermore, in step S2, when the area of ​​the plant fiber felt to be laid is large, multiple felts are connected into a whole by overlapping, sewing or using biodegradable adhesives.

[0021] Furthermore, during the construction of the sand-blocking section in step S3, the lower material of the sand barrier unit is directly inserted into and penetrates the plant fiber felt, so that the base protective layer and the sand-blocking section form a mechanical interlock in the vertical direction.

[0022] Compared with existing technologies, the plant fiber geomembrane composite sand barrier and its construction method provided by this invention, through the setting of a sand-blocking part, has a base protective layer at the bottom of the sand-blocking part. The base protective layer is composed of a flexible felt mat made of plant fibers. This structure forms a synergistic system of "upper blocking and lower fixing". The sand-blocking part at the top is responsible for intercepting wind and sand, while the plant fiber base protective layer at the bottom is like a "carpet against erosion", which tightly covers and fixes the loose sand particles at the base of the sand barrier, forming an integral protective surface. Even if the flowing sand on the windward and leeward sides is blown away by the wind, the base protective layer itself can effectively resist wind erosion and prevent erosion pits from developing directly below the sand barrier. This ensures that the "foot" of the sand barrier is always on a solid "foundation", which improves the reliability and risk resistance of the sand barrier when facing extreme wind and sand weather. At the same time, the plant fiber material ensures that the entire structure can be naturally degraded after completing its sand-fixing mission, without environmental pollution, which is in line with the goal of ecological governance. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0024] Figure 1 This is a schematic diagram of the overall structure of the plant fiber geomembrane composite sand barrier provided in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the vertical cross-sectional structure of the sand barrier unit and the base protection layer provided in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of a single sand barrier unit and its reinforcing components provided in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the sand barrier unit and the insert rod, etc., provided in an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of components such as the insert plate and the stabilizing plate provided in an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Sand-blocking section; 101. Sand barrier unit; 2. Base protection layer; 3. Reinforcing section; 4. Sandbag; 5. Mounting hole; 6. Insert rod; 7. Stop bar; 8. Positioning ring; 9. Stabilizing plate. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] As attached Figure 1 To be continued Figure 5 As shown:

[0033] Example:

[0034] The present invention provides a plant fiber geomembrane composite sand barrier, including a sand-blocking part 1, which is composed of multiple sand barrier units 101 erected on the surface of sand dunes;

[0035] The base protection layer 2 is made of a flexible felt mat made of plant fibers and is laid on the surface of the sand dune below the sand-blocking part 1. The edge of the base protection layer 2 extends to the outside of the windward and leeward sides of the sand-blocking part 1. The sand-blocking part 1 passes through the base protection layer 2 and is fixed in the sand body below it. The base protection layer 2 can be biodegraded in the natural environment after completing the sand-fixing function.

[0036] The reinforcing part 3 is installed on the outer periphery of the sand-blocking part 1. The reinforcing part 3 is made of a membrane material made of polymer and is attached to the surface of the sand dune. The top of the reinforcing part 3 is provided with a sandbag 4 for storing sand inside near the edge. The sandbag 4 presses the reinforcing part 3 onto the surface of the sand dune.

[0037] It should be noted that the sand-blocking section 1 has a base protective layer 2 at its bottom. The base protective layer 2 is made of a flexible felt pad made of plant fibers. This structure forms a synergistic system of "blocking above and solidifying below". The sand-blocking section 1 at the top is responsible for intercepting wind and sand, while the plant fiber base protective layer 2 at the bottom acts like an "anti-erosion carpet", tightly covering and fixing the loose sand particles at the base of the sand barrier, forming an integral protective surface. Even if the flowing sand on the windward and leeward sides is blown away by the wind, the base protective layer 2 itself can effectively resist wind erosion and prevent erosion pits from developing directly below the sand barrier. This ensures that the "foot" of the sand barrier is always on a solid "foundation", which improves the reliability and risk resistance of the sand barrier when facing extreme wind and sand weather. At the same time, the plant fiber material ensures that the entire structure can be naturally degraded after completing its sand-fixing mission, without environmental pollution, which is in line with the goal of ecological governance.

[0038] The reinforcing part 3 is made of high-density polyethylene (HDPE), polypropylene (PP), or polyvinyl chloride (PVC) geomembrane with a thickness of 0.2 mm to 0.8 mm and a tensile strength of not less than 5 kN / m. The sandbag 4 is made of biodegradable polylactic acid (PLA) nonwoven fabric or linen.

[0039] By selecting specific geomembrane materials with excellent mechanical properties, such as HDPE and PP, and limiting their thickness and strength range, the reinforcing section 3 is ensured to have sufficient tensile strength and puncture resistance, effectively resisting the impact and tearing of sandstorms on the sand barrier edges. Laying it around the sand-blocking section 1, it complements the internal base protection layer 2: the base protection layer 2 primarily prevents erosion and promotes ecological restoration, while the reinforcing section 3 acts as a robust "outer defense line." Through its high mechanical strength and the counterweight of the sandbags 4, it firmly presses itself onto the sand surface, enhancing the stability of the sand barrier system's edges and preventing the edges from being blown off in strong winds, thus preventing overall structural failure. The sandbags 4 are made of biodegradable materials, ensuring consistency with the overall environmental protection concept of the invention.

[0040] The sandbag 4 is a long strip-shaped bag pre-made from polylactic acid nonwoven fabric or linen, which is filled with sand and sealed on site during construction.

[0041] In this embodiment, the plant fiber of the base protective layer 2 is made of one or more of straw fiber, reed fiber, palm fiber or hemp fiber.

[0042] It should be noted that by using natural plant fibers such as straw fiber, reed fiber, palm fiber, or hemp fiber, these materials are widely available, inexpensive, and easily accessible, making them particularly suitable for large-scale application in desertification control. These fibers possess good flexibility and tensile strength, enabling them to adapt to the uneven terrain of sand dunes and ensuring a tight fit between the base protective layer 2 and the dunes. Furthermore, these plant fibers are completely biodegradable in the natural environment, preventing white pollution, and after degradation, they can be converted into organic matter, improving sand structure and promoting vegetation restoration. In addition, the mixed use of multiple fibers allows for the comprehensive utilization of their different properties; for example, straw fiber provides good coverage, reed fiber enhances durability, and palm fiber improves wind erosion resistance, thereby improving the overall performance and adaptability of the base protective layer 2.

[0043] In this embodiment: the base protective layer 2 is a fiber felt, non-woven fabric, or woven mat with tensile strength, made by mechanical rolling, needle punching, or weaving processes, with a unit area mass of 300g / m². 2 Up to 800g / m 2 The thickness of the base protective layer 2 is 3mm to 10mm.

[0044] It should be noted that fiber felt, non-woven fabric, or woven mats made through mechanical rolling, needle punching, or weaving processes have a uniform fiber distribution and a stable structure, providing sufficient tensile strength and tear resistance to prevent damage during installation or under wind and sand conditions. The unit area mass is controlled at 300g / m². 2 Up to 800g / m 2 Within this range, the base protective layer 2 is designed to be both heavy enough to withstand wind erosion without being too bulky to hinder construction efficiency. Its thickness, ranging from 3mm to 10mm, provides appropriate cushioning and coverage, effectively filling the micro-unevennesses on the dune surface and reducing wind erosion points. This specification of base protective layer 2 ensures protective effectiveness while also being economical and portable, facilitating transportation and on-site installation. Its porous structure also helps retain water and allow for air permeability, creating favorable conditions for subsequent vegetation growth.

[0045] In this embodiment: the base protective layer 2 is mixed with plant seeds or soil water-retaining agent, and the minimum distance from the edge of the base protective layer 2 to the boundary of the sand-blocking part 1 is 20 cm to 50 cm.

[0046] It should be noted that mixing plant seeds or soil water-retaining agents into the base protective layer 2 allows for simultaneous sand fixation and ecological restoration. Plant seeds are gradually released and germinate during the degradation of the protective layer, establishing vegetation using the microenvironment and moisture conditions provided by the layer, thus forming a long-term stable sand-fixing system. The soil water-retaining agent absorbs and retains moisture, reducing sandy soil moisture evaporation and improving seed survival and seedling growth rates. Extending 20 to 50 centimeters beyond the boundary of the sand-blocking section 1 ensures that the protective layer fully covers both the windward and leeward sides of the sand-blocking section 1, preventing wind erosion of the sand barrier base from the edges and extending the service life of the sand barrier. This design not only enhances the overall stability of the sand barrier but also promotes the ecological restoration of sand dunes, achieving a smooth transition from engineering-based sand fixation to biological sand fixation.

[0047] In this embodiment, the sand-blocking part 1 is a grass checkerboard sand barrier, a branch sand barrier, or a mesh sand barrier made of biodegradable plastic.

[0048] It should be noted that: straw checkerboard sand barriers utilize natural materials such as wheat straw and rice straw, while branch sand barriers use shrub branches or twigs. These materials are readily available and environmentally friendly, effectively reducing wind speed and intercepting shifting sand, while their rough surfaces promote sand deposition. Grid sand barriers made of biodegradable plastic possess high strength and durability, remaining stable during sand fixation and subsequently gradually degrading, avoiding environmental pollution. These sand-blocking components (1) can be flexibly selected based on local resource conditions and wind and sand intensity. For example, grid sand barriers are prioritized in areas with strong winds and sandstorms to enhance wind resistance, while straw checkerboard or branch sand barriers are chosen in ecologically sensitive areas to accelerate natural integration. The sand-blocking component (1) combined with the base protective layer (2) forms a multi-layered protection, significantly improving sand fixation efficiency and sustainability.

[0049] In this embodiment: in the row direction of the sand-blocking part 1, the top of the side wall shared by adjacent sand barrier units 101 is provided with vertical mounting holes 5 at intervals. The mounting holes 5 are provided with vertical insertion rods 6 that pass through the base protective layer 2, and the bottom of the insertion rods 6 are inserted into the sand dunes.

[0050] It should be noted that by setting the mounting hole 5 and the insertion rod 6, a reliable connection is achieved between the sand-blocking part 1 and the base protection layer 2, preventing relative displacement or separation of the two under the action of wind and sand. The insertion rod 6 vertically passes through the base protection layer 2 and is inserted deep into the sand dune, anchoring the sand-blocking part 1 in the sand body, enhancing the integrity and anti-tipping ability of the sand barrier. This installation method simplifies the construction process, allows for rapid assembly and adjustment, and the vertical force-bearing method of the insertion rod 6 can effectively resist the lateral thrust of wind and sand. In addition, the cooperation between the insertion rod 6 and the mounting hole 5 provides the possibility of disassembly or adjustment, facilitating the maintenance and repair of the sand barrier and extending its service life.

[0051] In this embodiment: a transverse stop bar 7 is provided between adjacent insertion rods 6, and the two ends of the stop bar 7 are fixedly connected to the insertion rod 6 respectively. Each insertion rod 6 is symmetrically provided with positioning rings 8 distributed vertically. The positioning rings 8 are movably fitted from the bottom of the insertion rod 6 and located below the stop bar 7. A stabilizing plate 9 is provided between adjacent insertion rods 6, and the two ends of the stabilizing plate 9 are fixedly connected to the positioning rings 8 fitted on the adjacent insertion rods 6 respectively. The stabilizing plate 9 is inserted into the sand dune.

[0052] It should be noted that the combined structure of the retaining strip 7, positioning ring 8, and stabilizing plate 9 forms a stable frame system, enhancing the lateral connection and overall rigidity of the insert rod 6. The retaining strip 7 acts as a lateral support, preventing the insert rod 6 from bending or tilting under wind and sand loads. The positioning ring 8 allows the stabilizing plate 9 to be flexibly installed and its height adjusted to adapt to changes in dune terrain. The stabilizing plate 9, inserted into the dune, increases the contact area with the sand mass, providing additional anchoring force and reducing the settlement and displacement of the sand barrier. This design enables the sand barrier to evenly distribute wind and sand pressure, improving its resistance to wind erosion and scouring, making it particularly suitable for environments with high wind and sand flows. Furthermore, all components can be prefabricated and standardized for production, facilitating rapid on-site installation and reducing construction costs and time.

[0053] The construction method of plant fiber geomembrane composite sand barrier includes the following steps:

[0054] Step 1: Construction preparation and site leveling

[0055] Survey and planning: Conduct on-site surveys of the target sand dune area, and determine the layout (such as grid or strip), spacing and overall range of the sand-blocking section 1 based on the prevailing wind direction, dune height and slope.

[0056] Material preparation: According to the design, prefabricate or prepare the required materials, including: plant fiber felt mat (base protection layer 2), sand-blocking part 1 material (such as grass bundles, branches or biodegradable plastic mesh), insert poles 6, retaining strips 7, positioning rings 8, stabilizing boards 9, bamboo or wooden U-shaped nails, sandbags 4, and necessary tools.

[0057] Site leveling: Within the planned area, roughly level the surface of the sand dunes, remove large debris, and make the surface relatively smooth without excessive compaction to maintain the aeration of the sand. Clearly mark the row and column positions of Unit 1 of the sand-blocking section using markers (such as ropes or wooden stakes).

[0058] Step 2: Installation of the supporting frame

[0059] Assemble the frame unit: Assemble the support frame at the marked intersections of rows and columns of the sand-blocking section 1 or at designated locations. Securely connect the retaining strip 7 to the upper part of the insert rod 6 to form a "T" or "+" shaped basic frame. Then, insert the positioning ring 8 from the bottom of the insert rod 6 and push it upwards to the designed height (usually below the retaining strip 7).

[0060] Implanting the skeleton: Place the assembled support skeleton vertically on the sand surface. Using a special tool or manual force, insert the insert rod 6 and the stabilizing plate 9 pre-connected to the positioning ring 8 into the sand dune until the bottom of the retaining strip 7 contacts the sand dune surface or is submerged in the shallow layer. Ensure that the insertion depth of the insert rod 6 is sufficient to provide effective anchoring (usually 30-50 cm), and that the tops of all skeleton units remain roughly horizontal, forming a stable three-dimensional support network.

[0061] Step 3: Laying and fixing the base protective layer 2

[0062] Laying the felt mat: Lay the plant fiber felt mat (base protection layer 2) on the flat sand surface where the support frame has been installed. When laying, ensure that the felt mat covers the entire planned area and extends its edge 20 to 50 centimeters beyond the boundary of the sand-blocking section 1.

[0063] Seam treatment: When the area of ​​a single felt pad is insufficient, use the overlapping method (overlap width not less than 10 cm), biodegradable thread for sewing, or apply biodegradable adhesive to tightly connect multiple felt pads into a whole covering layer to prevent wind and sand from eroding from the seams.

[0064] Drilling and securing: At the corresponding position of the insertion rod 6, make a small cut in the felt pad or use other methods to allow the insertion rod 6 to pass through smoothly. Then, use bamboo or wooden U-shaped nails to secure the felt pad at multiple points along the edges, seams, and center area to firmly anchor the felt pad to the sand surface and prevent it from being blown away by the wind.

[0065] Step 4: Construction of Sand-Blocking Section 1 and Reinforcing Section 3

[0066] Constructing Sand-Blocking Section 1:

[0067] For grass checkerboard or branch sand barriers: vertically press the center of the grass or branch bundles into the laid base protective layer 2 and the underlying sand, so that the lower material penetrates the felt mat and forms a mechanical interlock with the sand, while the exposed upper part forms a sand-blocking fence. This step can utilize the aforementioned support frame for guidance and reinforcement.

[0068] For the mesh sand barrier: unfold the biodegradable plastic mesh, align the mounting holes 5 with the inserted rods 6, ensure the lower edge of the mesh is close to the base protective layer 2, and press the bottom of the mesh into the sand at the preset width.

[0069] Installation of Reinforcing Section 3 and Sandbags 4: A membrane material of polymer is laid around the outer perimeter of the constructed sand-blocking section 1, ensuring it adheres tightly to the dune surface. Sandbags 4 filled with sand are then evenly placed on the top edge of the reinforcing section 3 membrane material. The weight of the sandbags 4 firmly presses the reinforcing section 3 onto the sand surface, preventing its edges from being blown away by the wind and enhancing the overall structure's resistance to wind erosion.

[0070] Step 5: Backfilling, compaction, and final finishing

[0071] Backfilling: The sand excavated during the construction of the sand-blocking section 1 is backfilled around the base of the sand barrier unit 101 (such as grass squares or grids), especially around the poles 6, the stabilizing plate 9, and the parts where the sand-blocking material is inserted into the sand body.

[0072] Compaction: The backfilled sand is compacted appropriately to ensure that the base of the sand-blocking part 1, the supporting frame, the sand body, and the base protection layer 2 are in close contact, eliminating obvious gaps and enhancing the integrity and erosion resistance of the structure.

[0073] Final inspection: Inspect the entire sand barrier system to ensure that the sand-blocking section 1 is firmly erected, the base protective layer 2 is flat and fixed, the reinforcing section 3 is stably pressed, and all connection points are reliable. Clean up the construction site.

[0074] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A plant fiber geomembrane composite sand barrier, characterized in that, include: The sand-blocking section (1) is composed of multiple sand barrier units (101) erected on the surface of the sand dunes; The base protection layer (2) is made of a flexible felt pad made of plant fiber and is laid on the surface of the sand dune below the sand-blocking part (1). The edge of the base protection layer (2) extends to the windward and leeward sides of the sand-blocking part (1). The sand-blocking part (1) passes through the base protection layer (2) and is fixed in the sand body below it. The base protection layer (2) can be biodegraded in the natural environment after completing the sand-fixing function. The reinforcing part (3) is installed on the outer periphery of the sand-blocking part (1). The reinforcing part (3) is made of a membrane material made of polymer and is attached to the surface of the sand dune. The top of the reinforcing part (3) near the edge is provided with a sandbag (4) for storing sand inside. The sandbag (4) presses the reinforcing part (3) onto the surface of the sand dune.

2. The plant fiber geomembrane composite sand barrier according to claim 1, characterized in that, The plant fiber of the base protective layer (2) is made of one or more of straw fiber, reed fiber, palm fiber or hemp fiber.

3. The plant fiber geomembrane composite sand barrier according to claim 1, characterized in that, The base protective layer (2) is a fiber felt, non-woven fabric, or woven mat with tensile strength, made by mechanical rolling, needle punching, or weaving processes, with a unit area mass of 300g / m². 2 Up to 800g / m 2 The thickness of the base protective layer (2) is 3 mm to 10 mm.

4. The plant fiber geomembrane composite sand barrier according to claim 2, characterized in that, The base protective layer (2) is mixed with plant seeds or soil water-retaining agent, and the minimum distance from the edge of the base protective layer (2) to the boundary of the sand-blocking part (1) is 20 cm to 50 cm.

5. The plant fiber geomembrane composite sand barrier according to claim 1, characterized in that, The sand-blocking part (1) is a grass checkerboard sand barrier, a branch sand barrier, or a grid sand barrier made of biodegradable plastic.

6. The plant fiber geomembrane composite sand barrier according to claim 5, characterized in that, In the row direction of the sand-blocking part (1), the top of the side wall shared by adjacent sand barrier units (101) is provided with vertical mounting holes (5) spaced apart. The mounting holes (5) are provided with vertical insertion rods (6) that pass through the base protective layer (2), and the bottom of the insertion rods (6) are inserted into the sand dunes.

7. The plant fiber geomembrane composite sand barrier according to claim 6, characterized in that, A transverse baffle (7) is provided between adjacent insertion rods (6). The two ends of the baffle (7) are fixedly connected to the insertion rods (6). Each insertion rod (6) is symmetrically provided with positioning rings (8) distributed vertically. The positioning rings (8) are movably inserted from the bottom of the insertion rod (6) and located below the baffle (7). A stabilizing plate (9) is provided between adjacent insertion rods (6). The two ends of the stabilizing plate (9) are fixedly connected to the positioning rings (8) sleeved on the adjacent insertion rods (6). The stabilizing plate (9) is inserted into the sand dune.

8. A method for constructing a plant fiber geomembrane composite sand barrier as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1: Level the surface of the sand dunes in the planning area, mark the location where the sand-blocking part (1) needs to be constructed, put the positioning ring (8) on the stabilizing plate (9) onto the insert rod (6), the top of the stabilizing plate (9) abuts against the baffle (7), and insert the stabilizing plate (9) and the insert rod (6) downwards into the predetermined depth of the sand dune. S2: Plant fiber felt mats are laid on the leveled sand dune surface to form a base protective layer (2), and bamboo or wooden U-shaped nails are used to fix the edges and seams of the felt mats. S3: On top of the laid plant fiber felt, a sand barrier unit (101) is constructed to form a sand-blocking part (1), so that the part of the inserted rod (6) exposed on the surface of the sand dune passes through the mounting hole (5) on the sand barrier unit (101). The side walls of the sand-blocking part (1) are provided with reinforcement parts (3), and the sandbags (4) are covered on the reinforcement parts (3). S4: Backfill the sand excavated during the construction of the sand-blocking section (1) to the base of the sand barrier unit (101) and compact it.

9. The method for constructing a plant fiber geomembrane composite sand barrier according to claim 8, characterized in that, In step S2, when the area of ​​the plant fiber felt to be laid is large, multiple felts are connected into a whole by overlapping, sewing or using biodegradable adhesives.

10. The method for constructing a plant fiber geomembrane composite sand barrier according to claim 8, characterized in that, When constructing the sand-blocking part (1) in step S3, the lower material of the sand barrier unit (101) is directly inserted into and penetrates the plant fiber felt, so that the base protective layer (2) and the sand-blocking part (1) form a mechanical interlock in the vertical direction.

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