Ecological slope protection structure of microbial mineralization combined with vegetation reinforcement and its construction method

Abstract

The present invention provides an ecological slope protection structure with microbial mineralization combined with vegetation reinforcement and its construction method, including a dry-laid rubble retaining wall to maintain the critical stability of the slope, a pre-buried grouting tube to inject microbial slurry, and after microbial mineralization, the cemented rubble to form a microbial mortar-laid rubble retaining wall to improve the initial stability. A degradable U-shaped trough is arranged on the outside of the retaining wall, and a guide layer containing hemp fiber, coconut fiber and plant growth hormone is laid on the bottom to guide the roots of plants on the top of the slope and on the horse trail to grow directional along the surface of the retaining wall. The monitoring system monitors the root growth and environmental parameters in real time, and the automatic irrigation device is linked to achieve precise irrigation. Finally, the microbial slurry is sprayed on the surface of the retaining wall to form a calcium carbonate hard crust layer, which further inhibits rainwater infiltration and prevents rainfall erosion on the slope. The present invention combines rapid reinforcement, long-term stability and ecological restoration effects through the synergistic effect of microbial grouting and vegetation roots, and is suitable for slope support projects in the humid and hot southeastern regions.

Description

Technical Field

[0001] The present invention relates to the technical field of slope support engineering, in particular to an ecological slope protection structure of microbial mineralization combined with vegetation reinforcement and a construction method thereof. Background Art

[0002] With the advancement of urbanization and infrastructure construction, slope instability is a frequent problem in the hot and humid southeastern region, due to high temperatures and heavy rainfall, which weakens the mechanical properties of rock and soil. While traditional slope reinforcement technologies (such as concrete retaining walls and anchor support) can improve stability in the short term, they are associated with complex construction processes, long maintenance cycles, and high material costs (the cost per cubic meter is 30%-50% higher than dry-laid stone). Furthermore, the rigid structures damage the ecological environment, making it difficult to achieve landscape integration.

[0003] In recent years, ecological slope protection technology has been gradually applied by combining vegetation root reinforcement with engineering measures. However, existing technologies generally have two major defects:

[0004] ① Insufficient initial support strength: relying solely on vegetation growth (such as direct sowing of herbaceous plants) requires 3-6 months to form an effective root network, during which time the slope is susceptible to erosion and instability due to rainwater;

[0005] ② Lack of directional guidance for root growth: Naturally grown roots are distributed in a disordered manner, and their adsorption and reinforcement effect on the retaining wall surface is limited. In addition, the durability of degradable materials (such as traditional straw fibers) in hot and humid environments is insufficient, making it difficult to guide the roots to extend along the predetermined path for a long time.

[0006] Furthermore, existing technologies fail to address the synergistic effects of rapid reinforcement and ecological restoration—the ability to rapidly improve slope stability during construction while also achieving long-term reinforcement and ecological restoration through vegetation root systems. Therefore, a new slope protection technology is urgently needed that balances construction efficiency, support strength, and eco-friendliness. Summary of the Invention

[0007] The purpose of the present invention is to provide an ecological slope protection structure of microbial mineralization combined with vegetation reinforcement and a construction method thereof to solve the above technical problems.

[0008] To solve the above technical problems, the present invention provides a construction method for an ecological slope protection structure of microbial mineralization combined with vegetation reinforcement, comprising the following steps:

[0009] S1. For fill slopes, backfill layer by layer from bottom to top and compact the surface; for cut slopes, excavate layer by layer from top to bottom.

[0010] S2. While excavating or backfilling the slope, a dry-laid stone retaining wall shall be constructed around the slope to be supported. The retaining wall foundation shall be constructed with dry-laid stone. The height of each retaining wall level shall be consistent with the height of the excavated or backfilled slope at the same level.

[0011] S3. Pre-embed grouting flower pipes in the dry-laid stone retaining wall;

[0012] S4. Degradable U-shaped grooves are laid out on the outside of the dry-stone retaining wall. The U-shaped grooves are arranged in a grid pattern to allow plant roots to grow within the U-shaped grooves and to be directly attached to the outer surface of the dry-stone retaining wall.

[0013] S5. Set up planting pits connected to the U-shaped trough at the top of the bridle path on each slope;

[0014] S6. After reaching the slope elevation, microbial grouting is carried out at the bridle path position of each level of the slope through the grouting flower tube;

[0015] S7. Place pressure sensors, humidity detectors, LED lights, and pinhole cameras in the U-shaped grooves to monitor the growth of vegetation roots and evaluate the reinforcement effect of the roots on the slope.

[0016] Step S8: Finally, spray the microbial slurry on the surface of the dry-laid stone retaining wall to form a calcium carbonate hard crust layer.

[0017] The beneficial effects of the present invention are:

[0018] 1. The dry-laid rubble retaining wall combined with microbial grouting technology eliminates the need for cement mortar operations and a lengthy curing period. The microbial slurry reacts quickly, mineralizing to form calcium carbonate precipitation, which bonds the rubble and retaining wall foundation, significantly improving the initial stability of the slope and solving the complex and long-term construction issues of traditional rigid support.

[0019] 2. The biodegradable U-shaped trough (made of polylactic acid (PLA)) and natural fiber guide layer (hemp fiber, coconut husk fiber) guide the directional growth of plant roots, avoiding pollution from traditional plastic materials. After the U-shaped trough is degraded, the roots of plants such as banyan trees continue to adhere to the surface of the retaining wall to form a mesh reinforcement structure, achieving the synergy of "rapid support through engineering measures" and "long-term reinforcement of plant roots", taking into account the long-term stability of the slope and ecological restoration.

[0020] 3. Integrate monitoring devices such as pinhole cameras, pressure sensors, and humidity detectors to obtain real-time root growth and soil environment data. Use the Internet of Things to control automatic irrigation devices to achieve precise irrigation, improve the intelligence level of slope maintenance, and reduce manual intervention costs.

[0021] 4. The dry-laid rubble retaining wall and microbial grouting form a rigid skeleton, providing initial support. At the same time, calcium carbonate generated by microbial mineralization fills the gaps between the rubble, effectively inhibiting rainwater infiltration and preventing erosion of the slope surface. Vegetation roots are directionally adsorbed on the retaining wall surface through the guide layer, forming a flexible reinforcement layer. The rigid-flexible structural design effectively addresses the environmental challenges of heavy rain and easy degradation of the mechanical properties of rock and soil in the hot and humid southeast region, making up for the shortcomings of traditional single reinforcement methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A side view of the ecological slope protection structure of the present invention combined with microbial mineralization and vegetation reinforcement;

[0023] Figure 2 It is an elevation view of each level of the slope of the present invention;

[0024] Figure 3 It is the U-shaped groove structure diagram of the present invention;

[0025] Figure 4 This is a schematic diagram of the connection between the planting pit and the U-shaped groove of the present invention;

[0026] Figure 5 is the slope stability result diagram of the unsupported slope;

[0027] Figure 6 This is the slope stability result diagram of the slope supported by the dry-laid stone retaining wall;

[0028] Figure 7 This is the slope stability result diagram of the slope supported by the grouting-formed mortar-laid stone retaining wall;

[0029] Figure 8 This is the slope stability result diagram of the slope supported by the mortar-laid stone retaining wall after the vegetation on the retaining wall surface and the slope top has taken root.

[0030] In the figure, 1. Slope to be supported; 2. Dry-laid stone retaining wall; 3. Grouting flower pipe; 4. Plants on the top of the slope; 5. Plants on the bridleway; 6. U-shaped groove; 7. Guide layer; 8. Pinhole camera; 9. Pressure sensor; 10. Humidity detector; 11. LED light; 12. Automatic irrigation device; 13. Planting pit; 14. Vegetation root system; 18. Calcium carbonate hard shell layer. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention are within the scope of protection of the present invention.

[0032] It should be understood by those skilled in the art that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0033] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0034] like Figures 1-8 The present invention provides a construction method for an ecological slope protection structure of microbial mineralization combined with vegetation reinforcement, comprising the following steps:

[0035] S1. For fill slopes, backfill layer by layer from bottom to top and use a roller to compact them. The layer thickness is 0.25~1m, the compaction degree of each layer is greater than 94%, the number of rolling passes is greater than 5, the slope ratio of each level is 1:1~1:0.5, and a bridleway with a width of 2~4m is provided when the fill height of each level is 6~10m. For excavation slopes, excavate layer by layer from top to bottom, the slope ratio of each level is 1:1~1:0.5, and a bridleway with a width of 2~4m is provided when the excavation height of each level is 6~10m.

[0036] S2. While excavating or backfilling the slope, a dry-laid rubble retaining wall 2 is built around the slope to be supported 1 to ensure that the slope maintains critical stability. The retaining wall foundation is also built with dry-laid rubble. The height of each retaining wall is consistent with the height of the excavation or backfill slope of the same level, which is also 6~10m. The width of the top of the retaining wall is usually 0.4~0.6m, the foundation burial depth is usually 0.5~1.0m, and the foundation width is generally 0.2~0.5m wider than the bottom of the retaining wall, depending on the geological conditions.

[0037] S3. Pre-embed grouting flower tubes 3 in the dry-laid rubble retaining wall 2 to facilitate the subsequent slurry to penetrate and bond in the rubble retaining wall. Grouting flower tubes 3 are arranged every 2 to 4 meters and set in the middle of the wall top. The inclination angle is the same as the slope of the retaining wall. The tube length is 3 to 5 meters and the diameter of the grouting flower tube 3 is 10 to 50 mm.

[0038] S4. On the outside of the dry-laid rubble retaining wall 2, according to the required slope stability requirements, degradable U-shaped grooves 6 (the material can be polylactic acid PLA, which is made of renewable resources such as corn starch and has good biodegradability) are laid out. The U-shaped grooves 6 are arranged in a grid shape with a spacing of 1 to 5 meters to allow the subsequent growth of vegetation roots 14 in the U-shaped grooves 6. The roots can be directly adsorbed on the outer surface of the dry-laid rubble retaining wall 2, thereby improving the stability of the retaining wall.

[0039] Step S4 also includes laying the guide layer 7: before laying the guide layer 7, the U-shaped groove 6 needs to be cleaned to ensure that there are no impurities, gravel or other obstacles that may affect the growth of the root system in the groove, and the hemp fiber and coconut husk fiber composite is evenly laid in the U-shaped groove 6 to ensure that the guide layer 7 is flat and has no obvious gaps. The laying thickness is generally 3-5 cm and is doped with 0.1-0.5wt% of plant growth hormone. The direction of the fiber should be consistent with the length direction of the U-shaped groove 6 to guide the root system to grow along the direction of the groove. To prevent the guide layer 7 from shifting during construction, the surface of the fiber layer can be gently compacted, or a small amount of degradable fiber mesh can be used for fixation. Plant growth regulators (such as rooting powder, indoleacetic acid, etc.) are additionally added to the guide layer 7 to promote root growth and promote its growth along the U-shaped groove 6.

[0040] S5. A planting pit 13 connected to the U-shaped groove 6 is set at the top of the bridle path of each slope, for subsequent growth of vegetation roots 14 along the U-shaped groove 6;

[0041] Trees are planted in the bridleway planting pits 13 on each slope level, and the U-shaped grooves 6 guide the growth of the plant roots 14. Once the roots have fully grown, slope stability is further improved. At this point, the U-shaped grooves 6 have completely degraded, allowing the fixed roots to continue to grow and develop, further enhancing slope stability and achieving a natural slope protection system, achieving a balance between aesthetics and safety. Trees are planted at the top of the slope, where the rock and soil are subject to tension and shear. The plant roots 14 grow vertically downward, resisting tension and shear, and improving slope stability.

[0042] S6. After reaching the slope elevation, microbial grouting is carried out at the horse path position of each level of the slope. The microbial grout can be a microbial solution and a reaction liquid. The microbial solution is one or more of urea-hydrolyzing bacteria and urease-producing bacteria, and the reaction liquid is a mixture of calcium chloride and urea. After the two react, the calcium carbonate generated fills the gaps in the dry-laid rubble and cements the rubble together to form a microbial mortar-laid rubble retaining wall. At the same time, the retaining wall foundation is also cemented by microorganisms, which jointly improves the stability of the slope.

[0043] In step S6, the microbial slurry is composed of a microbial solution and a reaction solution, wherein the bacterial concentration of the microbial solution is 1×10 8CFU / mL, the concentration of calcium chloride in the reaction solution was 1.5 mol / L, and the concentration of urea was 1.5 mol / L.

[0044] S7. Place pressure sensors 9, humidity detectors 10, LED lights 11, and pinhole cameras 8 in U-shaped grooves 6 to monitor the growth of plant roots 14 and assess their effectiveness in reinforcing the slope. Sensors can be placed every 1 to 3 meters, depending on the specific construction conditions.

[0045] In step S7, a monitoring system is arranged every 1 to 3 meters, and the pressure sensor and humidity detector transmit data to the central monitoring system through the wireless communication module to achieve real-time monitoring of root growth and soil environment.

[0046] Step S8: Finally, microbial slurry is sprayed on the surface of the retaining wall to form a calcium carbonate hard crust layer 18, which further inhibits rainwater infiltration and prevents erosion of the slope surface by rainfall.

[0047] The present invention also discloses an ecological slope protection structure with microbial mineralization combined with vegetation reinforcement. Taking the excavated slope of a highway in the humid and hot southeastern region as an example, the total slope height is 40m, divided into four levels, each level is 10m high, the slope ratio is 1:0.5, the rock and soil cohesion is 15kPa, and the internal friction angle is 30°. The ecological slope protection structure and method described in the present invention are used for support.

[0048] like Figure 1-4 As shown, the ecological slope protection structure of the microbial mineralization combined with vegetation reinforcement includes:

[0049] 1. Dry-laid stone retaining wall 2 and grouting system

[0050] Retaining wall construction: 2 dry-laid stone retaining walls are built around each level of the slope. The retaining wall is 10m high, 0.5m wide at the top, 0.8m deep in the foundation, and 0.3m wider than the bottom of the wall (adjusted according to geological conditions). M30 stone is used for dry-laid stone to maintain the critical stability of the slope.

[0051] Pre-buried grouting flower pipe 3: Pre-buried grouting flower pipe 3 in the middle of the top of the retaining wall, with a spacing of 3m, a pipe length of 4m, a diameter of 25mm, and an inclination angle consistent with the slope of the retaining wall (1:0.5), for subsequent microbial grouting.

[0052] 2. Vegetation guidance and monitoring system

[0053] Degradable U-shaped grooves 6: U-shaped grooves 6 made of PLA (8 cm deep, 10 cm wide) are arranged in a grid pattern at intervals of 2 m on the outside of the retaining wall. They are made of corn starch-based materials and have a degradation cycle of about 4 years[1], which matches the maturity period of the banyan tree roots.

[0054] Laying of the guide layer 7: A 4 cm thick composite of hemp fiber and coconut bran fiber (mass ratio 1:1) is laid at the bottom of the U-shaped groove 6, evenly mixed with 0.3 wt% indoleacetic acid. The fiber direction is consistent with the length direction of the U-shaped groove 6, and the surface is lightly pressed and fixed to provide a directional growth path for the roots.

[0055] Monitoring and irrigation: A monitoring device is installed every 2 meters inside the U-shaped trough 6. It includes a pinhole camera 8 (connected to a mobile phone via Wi-Fi), a pressure sensor 9 (accuracy ±2%), and a humidity detector 10 (triggering irrigation when the threshold is <60%). Data is transmitted to the central monitoring system via NB-IoT. An automatic irrigation device 12 is installed on the bridleway, aligned with the U-shaped trough 6, and receives instructions from the central system via the Internet of Things for precise water spraying.

[0056] 3. Vegetation configuration

[0057] Slope top plant 4: Banyan trees (DBH 10cm) are planted on the slope top with a spacing of 5m. The roots grow vertically downward to enhance the shear resistance of the slope top.

[0058] Bridleway plants 5: Banyan seedlings are planted in the planting pit 13 (50 cm in diameter, 40 cm in depth) at the top of the bridleway. The roots extend horizontally along the retaining wall surface through the U-shaped groove 6. After 3 months, the roots initially adhere to the retaining wall surface.

[0059] Based on the above-mentioned ecological slope protection structure of microbial mineralization combined with vegetation reinforcement and its construction steps, the following scheme can be adopted in the specific implementation of this scheme:

[0060] 1. Slope preprocessing (step S1)

[0061] The slope is excavated layer by layer from top to bottom. When the height of each slope reaches 10m, a 3m wide horseway is set up, which is inclined inward at 3° to facilitate drainage.

[0062] 2. Retaining wall construction and grouting (steps S2-S3, S6)

[0063] A dry-laid rubble retaining wall 2 was constructed simultaneously, with the foundation made of dry-laid rubble at a depth of 0.8 m. After pre-buried grouting tubes 3, microbial solution was injected at a grouting rate of 10 L / min and a construction temperature of 10-42°C. Microbial mineralization generated calcium carbonate precipitation, which filled the gaps between the rubble and solidified to form a microbial mortar-laid rubble retaining wall. The cohesion was increased to above 280 kPa, while the internal friction angle did not change much.

[0064] 3. Construction of vegetation guide layer 7 (steps S4, S7)

[0065] After cleaning the impurities in the U-shaped groove 6, lay a 4 cm thick hemp fiber-coconut bran fiber composite, add rooting powder (concentration 0.2 g / L), and arrange the fibers longitudinally along the retaining wall to ensure that the roots grow along the direction of the U-shaped groove 6.

[0066] 4. Monitoring and irrigation system installation (step S7)

[0067] A pressure sensor 9 (3 cm from the bottom of the trough) and a humidity detector 10 (2 cm from the bottom of the trough) are installed in the middle of the U-shaped trough 6. An LED light 11 (red light with a wavelength of 660 nm) is set every 3 meters to guide the roots to grow towards the light; the spacing between the nozzles of the automatic irrigation device 12 is consistent with the spacing between the U-shaped troughs 6 (2 meters), and the water spraying range covers the entire trough.

[0068] 5. Vegetation maintenance and effect monitoring

[0069] In the first week after construction, the root system was observed to germinate in the guide layer 7 through the pinhole camera 8; on the 30th day, the pressure sensor 9 showed that the root system exerted a pressure of 5kPa on the retaining wall surface, indicating that the roots had initially adsorbed; on the 180th day, the U-shaped groove 6 began to degrade (weight loss rate of about 15%), and the roots completely covered the retaining wall surface, forming a network structure.

[0070] In this embodiment, the implementation effect is verified as follows:

[0071] In this example, the rock mass has a cohesion of 15 kPa and an internal friction angle of 30°. The microbial mortar rubble formed after microbial grouting has a conservative value of c = 280 kPa and an internal friction angle of φ = 30°. The vegetation root system 14 is calculated in the form of piles, with a root diameter of 5 cm and a conservative value of 20 MPa for shear and tensile strength. GeoStudio software is used to calculate the slope stability. Figure 5-8 The slope stability results at different construction stages are shown.

[0072] like Figure 5 As shown, the unsupported slope FS=0.892 is unstable and needs to be supported at any time during the construction process.

[0073] like Figure 6 As shown in the figure, the slope supported by the dry-laid stone retaining wall 2 is FS=1.075, and the slope is in a basically stable state.

[0074] like Figure 7 As shown in the figure, after microbial grouting, a mortar-laid stone retaining wall is formed, and the slope stability coefficient changes from Figure 6 The slope stability of the dry-laid stone retaining wall 2 was increased from 1.075 to 1.294, meeting the requirements of the specification (FS≥1.3). The slope stability was significantly improved for the first time, making the slope stability meet the requirements of the specification.

[0075] like Figure 8As shown, one year after construction, the banyan tree roots reached a diameter of 5 cm. The combined use of a mortar-laid stone retaining wall, root systems deployed on the retaining wall's exterior, and multiple vertical root systems at the top of the slope further increased the stability coefficient to 1.317, and the root system's tensile strength reached 20 MPa, effectively suppressing shallow slope slip. This indicates that with the development of the vegetation root system, slope stability has gradually improved again, and the ecosystem has recovered well.

[0076] Ecological restoration: The vegetation coverage rate reaches 70% in one year, the U-shaped trough 6 is completely degraded in three years, and the roots wrap around the retaining wall to form a natural landscape.

[0077] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that is the same or similar to that of the present application falls within the scope of protection of the present invention.

Claims

1. A construction method for an ecological slope protection structure with microbial mineralization combined with vegetation reinforcement, characterized in that: The following steps are involved: S1. For fill slopes, backfill layer by layer from bottom to top and compact the surface; for excavation slopes, excavate layer by layer from top to bottom. S2. While excavating or backfilling the slope, a dry-laid stone retaining wall (2) is constructed outside the slope to be supported (1). The retaining wall foundation is constructed with dry-laid stone, and the height of each level of the retaining wall is consistent with the height of the excavation or backfill slope of the same level; S3, pre-embedding a grouting flower pipe (3) in the dry-laid stone retaining wall (2); S4. Degradable U-shaped grooves (6) are arranged on the outside of the dry-laid rubble retaining wall (2), and the U-shaped grooves (6) are arranged in a grid shape so that the vegetation roots (14) can grow in the U-shaped grooves (6) and can be directly adsorbed on the outer surface of the dry-laid rubble retaining wall (2); S5, setting a planting pit (13) connected to the U-shaped groove (6) at the top of the horse path on each level of the slope; S6. After reaching the slope elevation, microbial grouting is performed at the bridle path position of each level of the slope through the grouting flower tube (3); S7. Arrange a pressure sensor (9), a humidity detector (10), an LED light (11), and a pinhole camera (8) in the U-shaped groove (6) to monitor the growth of the vegetation root system (14) and evaluate the reinforcement effect of the root system on the slope; S8. Finally, spray microbial slurry on the surface of the dry-laid stone retaining wall (2) to form a calcium carbonate hard shell layer (18).

2. The construction method of the ecological slope protection structure of microbial mineralization combined with vegetation reinforcement according to claim 1 is characterized by: In step S1, the layer thickness of the fill slope is 0.25~1m, the compaction degree of each layer is greater than 94%, the number of rolling passes is greater than 5 times, the slope ratio of each level of the slope is 1:1~1:0.5, and a bridleway with a width of 2~4m is set when the fill height of each level of the slope is 6~10m; the slope ratio of each level of the excavation slope is 1:1~1:0.5, and a bridleway with a width of 2~4m is set when the excavation height of each level of the slope is 6~10m.

3. The construction method of the ecological slope protection structure of microbial mineralization combined with vegetation reinforcement according to claim 1 is characterized by: In step S2, the width of the top of the dry-laid rubble retaining wall (2) is 0.4-0.6m, the foundation burial depth is 0.5-1.0m, and the retaining wall foundation width is 0.2-0.5m wider than the bottom of the dry-laid rubble retaining wall (2).

4. The construction method of the ecological slope protection structure of microbial mineralization combined with vegetation reinforcement according to claim 1 is characterized by: In step S3, a grouting flower pipe (3) is arranged every 2 to 4 meters and is set in the middle position of the top of the dry-laid stone retaining wall (2). The inclination angle is the same as the slope of the dry-laid stone retaining wall (2). The pipe length is 3 to 5 meters and the diameter of the grouting flower pipe (3) is 10 to 50 mm.

5. The construction method of the ecological slope protection structure of microbial mineralization combined with vegetation reinforcement according to claim 1 is characterized by: Step S4 also includes laying a guide layer (7): before laying the guide layer (7), the U-shaped groove (6) is cleaned, and the hemp fiber and coconut chaff fiber composite is evenly laid in the U-shaped groove (6) with a laying thickness of 3-5 cm and doped with 0.1-0.5wt% of plant growth hormone; the laying direction of the fiber composite is consistent with the length direction of the U-shaped groove (6), and is compacted on the surface of the fiber layer or fixed using a degradable fiber mesh.

6. The construction method of the ecological slope protection structure of microbial mineralization combined with vegetation reinforcement according to claim 1 is characterized by: In step S5, trees are planted in the horse path planting pits (13) on each level of the slope, and the extension and growth of the vegetation roots (14) are guided by the U-shaped grooves (6); and the root growth is completed and the U-shaped grooves (6) are degraded.

7. The construction method of the ecological slope protection structure of microbial mineralization combined with vegetation reinforcement according to claim 1 is characterized by: In step S6, the microbial slurry is selected from a microbial solution and a reaction liquid, wherein the microbial solution is one or more of urea-hydrolyzing bacteria and urease-producing bacteria, and the reaction liquid is a mixture of calcium chloride and urea. After the two react, the generated calcium carbonate fills the gaps in the dry-laid rubble and cements the rubble together to form a microbial mortar-laid rubble retaining wall.

8. The construction method of the ecological slope protection structure of microbial mineralization combined with vegetation reinforcement according to claim 7 is characterized by: The bacterial concentration of the microbial solution is 1×10 8 CFU / mL, the concentration of calcium chloride in the reaction solution was 1.5 mol / L, and the concentration of urea was 1.5 mol / L.

9. The construction method of the ecological slope protection structure of microbial mineralization combined with vegetation reinforcement according to claim 1 is characterized by: An automatic irrigation device (12) is installed on the bridleway and aligned with the U-shaped groove (6).

10. An ecological slope protection structure with microbial mineralization combined with vegetation reinforcement, characterized by: It is obtained by the construction method of the ecological slope protection structure of microbial mineralization combined with vegetation reinforcement according to any one of claims 1 to 9.

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