Moisture regulation and soil fixation artificial grass ecological protection slope and construction method thereof

Abstract

The invention provides a moisture regulation and soil fixation artificial grass ecological protection slope and a construction method thereof, and belongs to the technical field of ecological slope protection, the moisture regulation and soil fixation artificial grass ecological protection slope comprises a slope body, an upper drainage ditch is arranged on the upper edge of the slope body, a lower drainage ditch is arranged on the lower edge of the slope body, a protection soil layer is arranged between the upper drainage ditch and the lower drainage ditch, and slope protection herbaceous vegetation is planted on the protection soil layer; a water storage tank is buried below the upper drainage ditch and communicated with the upper drainage ditch through a first automatic valve, wicking fiber geotextile is laid at the bottom of the protective soil layer, one end of the wicking fiber geotextile is attached to the water storage tank, and water stored in the water storage tank is sucked through a second automatic valve. The other end of the wicking fiber geotextile is attached to the lower drainage ditch, and water is drained into the lower drainage ditch through a third automatic valve. According to the artificial grass ecological protection slope capable of regulating and controlling the moisture and fixing the soil, rain wash can be prevented, the moisture in the slope body can be regulated and controlled, the soil layer of the slope body can be reinforced, and the stability of the slope is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of ecological slope protection, and more specifically, relates to a moisture control and soil-fixing artificial grass ecological protection slope and a construction method thereof. Background Art

[0002] The disturbance and damage of highway construction to the ecological environment is inevitable, especially in the slope area, where ecological restoration and green protection are particularly important. Ecological slope protection technology has been widely used as a measure to enhance the anti-erosion capacity of slopes and restore vegetation. However, the shortcomings of existing technologies in regulating water are becoming increasingly prominent, which not only affects the stability of slopes, but also poses severe challenges to the survival of vegetation.

[0003] The defects of existing ecological slope protection technology in water management, especially the inability to effectively maintain soil moisture during droughts and the inability to drain water in time during rainy periods, cause the slope soil to be overdry and oversaturated at times. This extreme moisture condition seriously affects the stability of the slope and the growth of vegetation. Specifically, the existing ecological slope protection technology has insufficient drainage capacity under heavy rainfall conditions and cannot quickly remove a large amount of rainwater, resulting in saturation of the slope soil and increasing the risk of landslides and erosion. At the same time, in the dry season, the slope soil lacks sufficient water retention capacity and cannot provide a continuous water supply for vegetation, making it difficult for plants to grow and even causing existing vegetation to wither and die. The water retention capacity of the surface soil of the slope is poor, and the existing reinforcement measures cannot effectively cope with the extreme changes in moisture conditions, resulting in reduced vegetation coverage, loose soil structure, and reduced anti-erosion ability and soil consolidation and slope protection efficiency. These problems not only affect the ecological restoration of the slope, but also weaken its long-term stability and protection capabilities.

[0004] Therefore, in order to ensure that the slope can effectively regulate water during the ecological restoration process and avoid slope instability caused by improper water management, it is urgent to develop and adopt more advanced water management and soil consolidation and slope protection technologies. These technologies should be able to maintain soil moisture during droughts and quickly drain water during rainy periods, while promoting the deep development of vegetation roots and stabilizing slope changes, and enhancing the adaptability of vegetation to extreme water conditions, thereby achieving long-term stability and ecological restoration of the slope. Summary of the invention

[0005] The purpose of the present invention is to provide a moisture-regulating and soil-fixing artificial grass ecological protection slope and a construction method thereof, aiming to provide a grass-planting ecological slope protection that can regulate moisture, reinforce soil, thereby preventing rainwater scouring and soil erosion, and improving slope stability.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a moisture regulation and soil-fixing artificial grass ecological protection slope, including a slope body, an upper drainage ditch is provided on the upper edge of the slope body along its length direction, and a lower drainage ditch is provided on the lower edge of the slope body along its length direction, a protective soil layer is provided between the upper drainage ditch and the lower drainage ditch, and slope protection herbaceous vegetation is planted on the protective soil layer, a water storage tank is buried below the upper drainage ditch, and the water storage tank and the upper drainage ditch are connected through a first automatic valve, and a wicking fiber geotextile is laid on the bottom of the protective soil layer, one end of the wicking fiber geotextile is attached to the side wall of the water storage tank, and the water stored in the water storage tank is absorbed by a second automatic valve arranged on the side wall of the water storage tank, and the other end of the wicking fiber geotextile is attached to the side wall of the lower drainage ditch, and the water is discharged into the lower drainage ditch through a third automatic valve arranged on the side wall of the drainage ditch.

[0007] In a possible implementation, the protective soil layer includes a planting layer and a base layer arranged one above the other, the wicking fiber geotextile is laid under the base layer, and the slope protection herbaceous vegetation is planted on the planting layer.

[0008] In a possible implementation, a three-dimensional geonet layer is provided between the planting layer and the base layer, the three-dimensional geonet layer is fixed to the base layer by U-shaped nails, and the planting layer is covered on the three-dimensional geonet layer.

[0009] In a possible implementation, artificial water-absorbing vegetation is implanted on the planting layer, and the artificial water-absorbing vegetation includes deep-rooted artificial grass and shallow-rooted artificial grass. The roots of the deep-rooted artificial grass extend downward to contact the wicking fiber geotextile, and the roots of the shallow-rooted artificial grass extend downward to the middle of the base layer.

[0010] In a possible implementation manner, the first automatic valve, the second automatic valve, and the third automatic valve are located in the same cross section of the slope.

[0011] The present invention also provides a construction method for constructing the above-mentioned water regulation and soil consolidation artificial grass ecological protection slope, comprising the following steps: S1. construct an upper drainage ditch and a lower drainage ditch at the upper and lower edges of the slope respectively, arrange a water storage tank under the upper drainage ditch, and connect the water storage tank and the upper drainage ditch through a first automatic valve; S2, dig the slope between the upper drainage ditch and the lower drainage ditch downwards, the excavation depth of the soil is H, and obtain the construction slope; S3, laying wicking fiber geotextile on the construction slope, so that one end of the wicking fiber geotextile is attached to the side wall of the water storage tank, and a second automatic valve is arranged on the side wall of the water storage tank, so that the water stored in the water storage tank can be transferred to the wicking fiber geotextile through the second automatic valve, and the other end of the wicking fiber geotextile is attached to the side wall of the lower drainage ditch, and a second automatic valve is arranged on the side wall of the lower drainage ditch, so that the water discharged from the wicking fiber geotextile can flow into the lower drainage ditch through the second automatic valve; S4, backfilling the soil excavated in step S2 onto the construction slope to construct the foundation layer of the protection slope; S5. Lay a three-dimensional geonet on the base layer of the protection slope, and use U-shaped nails to fix the three-dimensional geonet to the base layer of the protection slope; S6. Evenly covering the three-dimensional geonet with soil to form a covering soil layer, spraying mud with grass seeds of herbaceous plants for slope protection on the covering soil layer to form a mud layer, and combining the covering soil layer and the mud layer to form a planting layer; S7. Planting artificial water-absorbing vegetation in a matrix on the planting layer; S8. Lay non-woven fabric on the planting layer, sprinkle water on the planting layer every day for maintenance, and when the seedlings of the slope protection herbaceous vegetation grow to 4-6cm, remove the non-woven fabric.

[0012] In a possible implementation, the depth H of the soil excavated in step S2 is 1.5 times the longest root length h0 of the herbaceous vegetation selected for slope protection in step S6.

[0013] In a possible implementation, in step S6, the thickness of the covering soil layer is not less than 2 cm, and the thickness of the mud layer is not less than 3 cm.

[0014] In a possible implementation, the artificial water-absorbing vegetation includes deep-root artificial grass and shallow-root artificial grass. In the matrix formed by the deep-root artificial grass, the distance between adjacent deep-root artificial grasses is a, and in the matrix formed by the shallow-root artificial grass, the distance between adjacent shallow-root artificial grasses is a. Adjacent deep-root artificial grasses and shallow-root artificial grasses are staggered, and the lateral net spacing and longitudinal net spacing between adjacent deep-root artificial grasses and shallow-root artificial grasses are both a / 2.

[0015] In a possible implementation, the value a is determined by the following formula:

[0016] Where D1 is the root diameter of deep-rooted artificial grass; d1 is the root diameter of shallow-rooted artificial grass; ξ is the local resistance coefficient; θ is the slope gradient; Re is the Reynolds number; k1-k7 are fitting coefficients, which are 4.87, 3.53, -0.49, 6.58, -0.21, 0.33 and -0.38 respectively.

[0017] The beneficial effects of the water regulation and soil consolidation artificial grass ecological protection slope and the construction method thereof provided by the present invention are: (1) It can achieve effective diffusion and discharge of water under rainfall conditions.

[0018] (2) It can achieve effective use of rainwater. The water tank can effectively store rainwater in the rainy season, and then transfer the water to the slope soil when the weather is dry, thereby effectively utilizing the rainwater and providing water for the herbaceous vegetation on the slope.

[0019] (3) It can effectively reinforce the soil. The slope can be reinforced by using herbaceous vegetation, three-dimensional geonet and artificial water-absorbing vegetation. Artificial water-absorbing vegetation can also promote plant growth and ensure the development of the root system, further enhancing the slope reinforcement effect of vegetation, anchoring the shallow soil and improving the stability of the slope.

[0020] (4) It can effectively prevent rainwater erosion. Slope protection herbaceous vegetation and artificial water-absorbing vegetation can jointly achieve the goal of preventing rainwater erosion and effectively avoid soil erosion and soil loss.

[0021] (5) It effectively provides water to the roots of the herbaceous vegetation on the slope protection, which can retain rainwater in the soil to prevent volatilization, thereby improving the survival rate of the herbaceous vegetation on the slope protection and having better ecological, environmental and economic benefits.

[0022] (6) It effectively provides a better living environment for the herbaceous vegetation on the slope and improves its growth performance, which improves the road environment of the highway, provides a better living home for the slope biological community, and also provides drivers with a better road landscape. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the cross-sectional structure of a moisture control and soil-fixing artificial grass ecological protection slope provided by an embodiment of the present invention; Figure 2 for Figure 1Schematic diagram of the enlarged structure at M in FIG. Figure 3 This is a schematic diagram of the layout structure of deep-root artificial grass and shallow-root artificial grass provided in an embodiment of the present invention.

[0025] Description of reference numerals: 1. Slope; 2. Upper drainage ditch; 3. Lower drainage ditch; 4. Water storage tank; 41. Interlayer; 5. Wicking fiber geotextile; 6. Protective soil layer; 61. Foundation layer; 62. Planting layer; 7. Three-dimensional geonet layer; 8. Artificial water-absorbing vegetation; 81. Deep-rooted artificial grass; 82. Shallow-rooted artificial grass; 9. U-shaped nails; 10. First automatic valve; 11. Second automatic valve; 12. Third automatic valve. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] See also Figure 1 to Figure 2 Now, a water regulation and soil fixation artificial grass ecological protection slope provided by the present invention is described. The water regulation and soil fixation artificial grass ecological protection slope comprises a slope body 1, an upper drainage ditch 2 is provided on the upper edge of the slope body 1 along its length direction, a lower drainage ditch 3 is provided on the lower edge of the slope body 1 along its length direction, a protective soil layer 6 is provided between the upper drainage ditch 2 and the lower drainage ditch 3, and slope protection herbaceous vegetation is planted on the protective soil layer 6, a water storage tank 4 is buried below the upper drainage ditch 2, and the water storage tank 4 is connected to the upper drainage ditch 2 through a first automatic valve 10, and a wicking fiber geotextile 5 is laid at the bottom of the protective soil layer 6, one end of the wicking fiber geotextile 5 is attached to the side wall of the water storage tank 4, and the water in the water storage tank 4 is absorbed by a second automatic valve 11 arranged on the side wall of the water storage tank 4, and the other end of the wicking fiber geotextile 5 is attached to the side wall of the lower drainage ditch 3, and the water is discharged into the lower drainage ditch 3 through a third automatic valve 12 arranged on the side wall of the drainage ditch.

[0028] In this embodiment, the water tank 4 can be made of stainless steel material, the inner wall thickness of the water tank 4 is 1 cm, the width of the water tank 4 is 80 cm, the height of the water tank 4 is 60 cm, the length of the water tank 4 and the length of the upper drainage ditch 2 are both equivalent to the length of the slope 1, and the first automatic valve 10 is an automatic clamp-type valve arranged on the top of the water tank 4. The first automatic valve 10 penetrates the bottom surface of the upper drainage ditch 2 upward. When the first automatic valve 10 is in an open state, the accumulated water in the upper drainage ditch 2 will flow into the water tank 4 through the first automatic valve 10. In this embodiment, the number of the first automatic valves 10 is multiple, and the multiple first automatic valves 10 are arranged at intervals of 2m along the length direction of the water tank.

[0029] In this embodiment, the wicking fiber geotextile 5 is a geotextile with a thickness of 5-15 cm and a material of synthetic fiber (polyester) woven therefrom. The wicking fiber geotextile 5 has good water absorption and water transmission properties, can better absorb moisture in the soil, and ensure that moisture is better transmitted therein. In application, an interlayer 41 is provided on the side of the water tank 4 close to the wicking fiber geotextile 5, and an installation gap is provided on the side wall of the interlayer 41 close to the wicking fiber geotextile 5. The wicking fiber geotextile 5 extends into the interlayer 41 of the water tank 4 through the installation gap, and is attached to the side wall between the interlayer 41 and the inner cavity of the water tank 4. In this embodiment, the second automatic valve 11 is provided below the side wall between the interlayer 41 and the inner cavity of the water tank 4. The second automatic valve 11 is also an automatic clamp-type valve. When the second automatic valve 11 is opened, the water stored in the water tank 4 can be absorbed by the wicking fiber geotextile 5 and transmitted along the wicking fiber geotextile 5 to the side of the drainage ditch 3 below.

[0030] In some embodiments, the number of the second automatic valves 11 and the third automatic valves 12 and the number and distribution of the first automatic valves 10 correspond to the first automatic valves 10, that is, each group of corresponding first automatic valves 10, second automatic valves 11 and third automatic valves 12 are in the same cross section of the slope 1. Through the above arrangement, the transmission distance of the water flow in the wicking fiber geotextile 5 can be shortened to the maximum extent, and the drainage speed can be improved. Optionally, the first automatic valve 10, the second automatic valve 11 and the third automatic valve 12 are equipped with wireless transmission devices and batteries, and can be remotely controlled by a controller.

[0031] In some embodiments, the above-mentioned protective soil layer 6 includes a planting layer 62 and a base layer 61 arranged upper and lower, the wicking fiber geotextile 5 is laid under the base layer 61, and the slope protection herbaceous vegetation is planted on it. A three-dimensional geonet layer 7 is provided between the planting layer 62 and the base layer 61. The three-dimensional geonet layer 7 is fixed to the base layer 61 by U-shaped nails 9. The planting layer 62 covers the three-dimensional geonet layer 7, and artificial water-absorbing vegetation 8 is inserted on the planting layer 62. The artificial water-absorbing vegetation 8 includes deep-rooted artificial grass 81 and shallow-rooted artificial grass 82. The roots of the deep-rooted artificial grass 81 extend downward to contact the wicking fiber geotextile 5, and the roots of the shallow-rooted artificial grass 82 extend downward to the middle of the base layer 61.

[0032] In this embodiment, the three-dimensional geonet layer 7 adopts the EM2 type three-dimensional geonet, and the U-shaped nail 9 is made of steel bars. The diameter of the steel bars is not less than 8 mm, the length of the U-shaped nail 9 is not less than 30 cm, and the width is 8 cm. The three-dimensional geonet layer 7 is fixed from top to bottom with U-shaped nails 9, and multiple U-shaped nails 9 are arranged in a matrix, and the spacing between adjacent U-shaped nails 9 is 1-1.5m. In application, the planting layer 62 covers the three-dimensional geonet layer 7. The three-dimensional geonet layer 7 can be embedded in the planting layer 62 by virtue of its mesh structure, so that the planting layer 62 is tightly combined with the three-dimensional geonet layer 7. At the same time, the three-dimensional geonet layer 7 is firmly fixed to the base layer 61 by means of U-shaped nails 9. In this way, the planting layer 62 and the base layer 61 can be stably connected by means of the connection of the three-dimensional geonet layer 7, thereby improving the stability of the planting layer 62.

[0033] In some embodiments, the stems and leaves of the above-mentioned deep-root artificial grass 81 are composite materials made of synthetic fibers (polyester) and are designed to be green in color; the rhizomes are composite materials made of synthetic fibers (polyester) and are designed to be brown in color. This material can absorb and transmit water. The roots of the deep-root artificial grass 81 are in contact with the wicking fiber geotextile 5 downward. When the rainfall is heavy in the rainy season, the deep-root artificial grass 81 can form a certain shielding for the planting layer 62 to prevent rainwater from excessively scouring the planting layer 62, and the rainwater absorbed by the deep-root artificial grass 81 can be timely transmitted to the wicking fiber geotextile 5 through its roots and then discharged into the lower drainage ditch 3. The stems and leaves of the shallow-root artificial grass 82 are composite materials made of synthetic fibers (polyester) and are designed to be green in color. The rhizomes are composite materials made of synthetic fibers (polyester) and are designed to be brown in color. The material can absorb and transfer water. The roots of the shallow-rooted artificial grass 82 extend downward to the middle of the base layer 61. In practical applications, the middle area of ​​the base layer 61 is the area that the roots of the slope protection herbaceous vegetation can reach. In the rainy season, the shallow-rooted artificial grass 82 can provide a certain shielding for the base layer 61 to prevent excessive erosion of the planting layer 62 by rainwater, and can directly transfer the absorbed water to the soil through its roots, providing the required water for the roots of the slope protection herbaceous vegetation. In addition, the deep-rooted artificial grass 81 and the shallow-rooted artificial grass 82 penetrate the planting layer 62 and are inserted into the base layer 61, which also plays an anchoring role for the planting layer 62.

[0034] The present invention provides a water regulation and soil fixation artificial grass ecological protection slope, which mainly includes two aspects in water regulation: First, it can realize the effective diffusion and discharge of excess water under rainfall conditions. The shallow-rooted artificial grass 82 can effectively diffuse excess water and absorb and transmit water well, so the runoff and accumulated water caused by rainfall on the slope can be discharged into the soil as much as possible, and gradually diffused along its roots, effectively providing water for the root system of the slope protection herbaceous vegetation. At the same time, it can retain rainwater to prevent volatilization, thereby improving the survival rate of the slope protection herbaceous vegetation; the deep-rooted artificial grass 81 can effectively discharge excess water. When the rainfall is too heavy, resulting in excessive water on the slope or soil saturation, the deep-rooted artificial grass 81 can effectively absorb and transmit rainwater to the wicking fiber geotextile 5. Through the action of gravity, the water in the wicking fiber geotextile 5 will be transmitted downward along it to the lower drainage ditch 3.

[0035] Secondly, it can realize the effective utilization of rainwater. The water storage tank 4 can effectively store rainwater in the rainy season. When the weather is dry, the water can be transferred to the slope soil through the wicking fiber geotextile 5. Then, the rhizomes of the deep-rooted artificial grass 81 can absorb the water to the soil along the rhizomes, thereby effectively utilizing the rainwater and providing water to the herbaceous vegetation for slope protection, thus achieving the unity of environmental protection and economy.

[0036] The present invention provides a kind of water regulation and soil consolidation artificial grass ecological protection slope, which mainly includes slope protection herbaceous vegetation reinforcement, three-dimensional geonet layer 7 reinforcement and artificial water-absorbing vegetation 8 reinforcement in terms of soil reinforcement, that is, a three-in-one slope reinforcement. The root system of the slope protection herbaceous vegetation can effectively reinforce the slope soil and improve the cohesion of the soil; the combination of the three-dimensional geonet layer 7 and the slope protection herbaceous vegetation can reduce the rain erosion suffered by the slope and improve the stability of the surface layer; and the deep-rooted artificial grass 81 and the shallow-rooted artificial grass 82 can further reinforce the three-dimensional geonet layer 7. At the same time, they are similar to reinforcement materials and can anchor the shallow soil to improve the stability of the slope. The three-in-one slope reinforcement forms a solid reinforced structure, which improves the overall stability of the slope.

[0037] The present invention also provides a method for constructing the above-mentioned water regulation and soil consolidation artificial grass ecological protection slope, comprising the following steps: S1. construct an upper drainage ditch and a lower drainage ditch at the upper and lower edges of the slope respectively, arrange a water storage tank under the upper drainage ditch, and connect the water storage tank and the upper drainage ditch through a first automatic valve; S2, dig the slope between the upper drainage ditch and the lower drainage ditch downwards, the excavation depth of the soil is H, and obtain the construction slope; S3, laying wicking fiber geotextile on the construction slope, so that one end of the wicking fiber geotextile is attached to the side wall of the water storage tank, and a second automatic valve is arranged on the side wall of the water storage tank, so that the water stored in the water storage tank can be transferred to the wicking fiber geotextile through the second automatic valve, and the other end of the wicking fiber geotextile is attached to the side wall of the lower drainage ditch, and a second automatic valve is arranged on the side wall of the lower drainage ditch, so that the water discharged from the wicking fiber geotextile can flow into the lower drainage ditch through the second automatic valve; S4, backfilling the soil excavated in step S2 onto the construction slope to construct the foundation layer of the protection slope; S5. Lay a three-dimensional geonet on the base layer of the protection slope, and use U-shaped nails to fix the three-dimensional geonet to the base layer of the protection slope; S6. Evenly cover the three-dimensional geonet with soil to construct a covering soil layer, spray mud with grass seeds of herbaceous plants for slope protection on the covering soil layer to construct a mud layer, and the covering soil layer and the mud layer are combined to form a planting layer; S7, planting artificial water-absorbing vegetation in a matrix on the planting layer; S8. Lay non-woven fabric on the planting layer, sprinkle water on the planting layer every day for maintenance, and when the seedlings of the slope protection herbaceous vegetation grow to 4-6cm, remove the non-woven fabric.

[0038] Specifically, before performing the above step S2, it is necessary to clean up the debris on the slope. The debris mainly refers to dead branches, rotten leaves and larger pieces of stone. The depth H of the soil excavated in step S2 is 1.5 times the longest rhizome length h0 of the slope protection herbaceous vegetation selected in step S6. The slope protection herbaceous vegetation is mainly based on the single or mixed herbaceous vegetation used in the ecological slope treatment process, such as: sedge, alfalfa, dogtooth grass, tall fescue, wolfberry, bahia grass, alfalfa, vetiver, etc.

[0039] After digging the soil, the construction slope surface needs to be leveled before proceeding to step S3. In actual operation, when performing step S3, multiple wicking fiber geotextiles are needed to cover the entire construction slope surface. During operation, the wicking fiber geotextile and the construction slope surface are kept smoothly fitted and the two overlaps are overlapped by 20 cm.

[0040] When performing step S4, the excavated soil is evenly covered on the upper part of the wicking fiber geotextile and the upper part of the water tank on the top of the slope according to the excavated thickness, so as to obtain the base layer of the protective slope. Before performing step S5, the slope surface of the base layer needs to be leveled. When performing step S6, the three-dimensional geonet needs to be laid from top to bottom. The three-dimensional geonet and the slope surface of the base layer should be kept smooth and fit, and the two three-dimensional geonets should overlap by 20cm at the overlap, and need to extend to the edge of the upper drainage ditch at the top of the slope. When using U-shaped nails to fix the three-dimensional geonet, it is necessary to follow the order from top to bottom. During the operation, the U-shaped nails are arranged in a matrix on the three-dimensional geonet, and the spacing between adjacent U-shaped nails is 1-1.5m.

[0041] In step S6, the thickness of the covering soil layer is not less than 2 cm, and the thickness of the mud layer is not less than 3 cm. In actual operation, the mud with the grass seeds of the slope protection herbaceous vegetation in step S6 is mixed with a compound fertilizer at a mass ratio of 2%, and after mixing, a water retaining agent is added at a mass ratio of 3-6‰; the grass seeds of the slope protection herbaceous vegetation are pole wood (3g / m 2 )、Alfalfa(6.5g / m 2 )、Tall Fescue(3.5g / m 2 )、Cynodon dactylon(5.5g / m 2 )、Spike (4g / m 2 ) or a combination of two or more.

[0042] In the above step S7, please refer to Figure 3The artificial water-absorbing vegetation includes deep-root artificial grass and shallow-root artificial grass. In the matrix formed by the deep-root artificial grass, the distance between adjacent deep-root artificial grass is a, and in the matrix formed by the shallow-root artificial grass, the distance between adjacent shallow-root artificial grass is a. Adjacent deep-root artificial grass and shallow-root artificial grass are staggered, and the lateral net distance and the longitudinal net distance between adjacent deep-root artificial grass and shallow-root artificial grass are both a / 2.

[0043] During the specific operation, the first row of deep-rooted artificial grass is inserted from the top of the slope of the planting layer, and the lateral clear distance between each deep-rooted artificial grass is a. The first row of shallow-rooted artificial grass is inserted downward along the slope, and the lateral clear distance between the first row of shallow-rooted artificial grass is a. The longitudinal clear distance between the first row of deep-rooted artificial grass and the first row of shallow-rooted artificial grass is a / 2, and the two rows of artificial grass are arranged crosswise. The second row of deep-rooted artificial grass is inserted downward along the slope, and the longitudinal clear distance between the first row of shallow-rooted artificial grass and the second row of deep-rooted artificial grass is a / 2, and the two rows of artificial grass are arranged crosswise. The second row of shallow-rooted artificial grass is inserted downward, and the longitudinal clear distance between the second row of deep-rooted artificial grass and the second row of shallow-rooted artificial grass is a / 2, and the two rows of artificial grass are arranged crosswise. In this way, the deep-rooted artificial grass and the shallow-rooted artificial grass are laid successively downward to cover the entire slope of the planting layer.

[0044] In step S7, the value a is determined by the following formulas (1)-(6): (1) Where D1 is the root diameter of deep-rooted artificial grass; d1 is the root diameter of shallow-rooted artificial grass; ξ is the local resistance coefficient; θ is the slope gradient; Re is the Reynolds number; k1-k7 are fitting coefficients, which are 4.87, 3.53, -0.49, 6.58, -0.21, 0.33 and -0.38 respectively.

[0045] (2) Where λ is the drag coefficient along the way; g is the acceleration due to gravity (m 2 / s); η is the slope roughness coefficient; R is the hydraulic radius (m), which is calculated here as equal to the average water depth h of the slope flow.

[0046] (3) Where z is the height of the slope (m); v is the average flow velocity of the slope water (m / s).

[0047] (4) In the formula, v T is the starting velocity of the slope particles (m / s); h is the average water depth of the slope flow (m); D m is the typical soil particle diameter of the slope (m); ρ s ,w They are the natural density of soil and water density (kN / m3) respectively.

[0048] The average water depth h of the slope flow can be obtained by the SCS-CN model according to the water flow depth at the maximum rainfall in the corresponding slope protection area, as shown in formulas (5) and (6).

[0049] (5) (6) Where P is rainfall (mm); S is the potential maximum retention capacity (mm); ψ is the initial loss rate; CN is determined by the land cover, land management and hydrological soil group, and the soil type is determined by the indicators defined by the hydrological soil group, and then obtained from the SCS manual.

[0050] Substituting the average depth of slope water flow h and the relevant physical parameters of the grass slope measured and monitored into equation (4), the slope foot flow velocity v can be obtained: T , and then the obtained slope foot velocity v T , the Re of the slope runoff corresponding to the maximum rainfall in the slope protection area and the relevant physical parameters of the grass-planted slope are substituted into formula (3), and then a can be calculated by combining formula (1) and formula (2).

[0051] In step S8, the nonwoven fabric 10 g / m 2 The material is polyester composite. After covering, it can retain water, facilitate maintenance and ensure the germination and growth of grass seeds, so as to ensure that the mud and grass seeds sprayed during the maintenance process will not fall off. After the non-woven fabric is laid on the planting layer, the main body of the protective slope is completed. Before the herbaceous vegetation on the slope grows, the protective slope is in the maintenance period. In the early stage of maintenance, it is necessary to ensure that the planting layer is watered twice a day, once in the morning and once in the afternoon. When the seedlings of the herbaceous vegetation on the slope grow to 4-6cm, remove the non-woven fabric to avoid preventing plant growth. During the maintenance period, check whether the deep-rooted artificial grass and shallow-rooted artificial grass have fallen off and need to be replanted.

[0052] 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 and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A water regulation and soil fixation artificial grass ecological protection slope, characterized in that: It includes a slope body, wherein an upper drainage ditch is provided at the upper edge of the slope body along its length direction, and a lower drainage ditch is provided at the lower edge of the slope body along its length direction, a protective soil layer is provided between the upper drainage ditch and the lower drainage ditch, and slope protection herbaceous vegetation is planted on the protective soil layer, a water tank is buried below the upper drainage ditch, and the water tank and the upper drainage ditch are connected through a first automatic valve, and a wicking fiber geotextile is laid at the bottom of the protective soil layer, one end of the wicking fiber geotextile is attached to the side wall of the water tank, and the water in the water tank is absorbed through a second automatic valve arranged on the side wall of the water tank, and the other end of the wicking fiber geotextile is attached to the side wall of the lower drainage ditch, and the water is discharged into the lower drainage ditch through a third automatic valve arranged on the side wall of the drainage ditch.

2. The water regulation and soil fixation artificial grass ecological protection slope according to claim 1, characterized in that: The protective soil layer comprises a planting layer and a base layer arranged one above the other, the wicking fiber geotextile is laid below the base layer, and the slope protection herbaceous vegetation is planted on the planting layer.

3. The water regulation and soil fixation artificial grass ecological protection slope according to claim 2, characterized in that: A three-dimensional geonet layer is provided between the planting layer and the base layer. The three-dimensional geonet layer is fixed to the base layer by U-shaped nails, and the planting layer is covered on the three-dimensional geonet layer.

4. The water regulation and soil fixation artificial grass ecological protection slope according to claim 2, characterized in that: Artificial water-absorbing vegetation is inserted on the planting layer, and the artificial water-absorbing vegetation includes deep-root artificial grass and shallow-root artificial grass. The roots of the deep-root artificial grass extend downward to contact the wicking fiber geotextile, and the roots of the shallow-root artificial grass extend downward to the middle of the base layer.

5. The water regulation and soil fixation artificial grass ecological protection slope according to claim 1, characterized in that: The first automatic valve, the second automatic valve and the third automatic valve are located in the same cross section of the slope.

6. A construction method for constructing the water regulation and soil fixation artificial grass ecological protection slope as claimed in claim 4, characterized in that: The following steps are involved: S1. construct an upper drainage ditch and a lower drainage ditch at the upper and lower edges of the slope respectively, arrange a water storage tank under the upper drainage ditch, and connect the water storage tank and the upper drainage ditch through a first automatic valve; S2, dig the slope between the upper drainage ditch and the lower drainage ditch downwards, the excavation depth of the soil is H, and obtain the construction slope; S3, laying wicking fiber geotextile on the construction slope, so that one end of the wicking fiber geotextile is attached to the side wall of the water storage tank, and a second automatic valve is arranged on the side wall of the water storage tank, so that the water stored in the water storage tank can be transferred to the wicking fiber geotextile through the second automatic valve, and the other end of the wicking fiber geotextile is attached to the side wall of the lower drainage ditch, and a second automatic valve is arranged on the side wall of the lower drainage ditch, so that the water discharged from the wicking fiber geotextile can flow into the lower drainage ditch through the second automatic valve; S4, backfilling the soil excavated in step S2 onto the construction slope to construct the foundation layer of the protection slope; S5. Lay a three-dimensional geonet on the base layer of the protection slope, and use U-shaped nails to fix the three-dimensional geonet to the base layer of the protection slope; S6. Evenly covering the three-dimensional geonet with soil to form a covering soil layer, spraying mud with grass seeds of herbaceous plants for slope protection on the covering soil layer to form a mud layer, and combining the covering soil layer and the mud layer to form a planting layer; S7. Planting artificial water-absorbing vegetation in a matrix on the planting layer; S8. Lay non-woven fabric on the planting layer, sprinkle water on the planting layer every day for maintenance, and when the seedlings of the slope protection herbaceous vegetation grow to 4-6cm, remove the non-woven fabric.

7. A construction method according to claim 6, characterized in that: The depth H of the soil excavated in step S2 is 1.5 times the longest root length h0 of the herbaceous vegetation selected for slope protection in step S6.

8. A construction method according to claim 6, characterized in that: In step S6, the thickness of the covering soil layer is not less than 2 cm, and the thickness of the mud layer is not less than 3 cm.

9. A construction method according to claim 6, characterized in that: The artificial water-absorbing vegetation includes deep-root artificial grass and shallow-root artificial grass. In the matrix formed by the deep-root artificial grass, the distance between adjacent deep-root artificial grasses is a, and in the matrix formed by the shallow-root artificial grass, the distance between adjacent shallow-root artificial grasses is a. Adjacent deep-root artificial grasses and shallow-root artificial grasses are staggered, and the lateral net distance and the longitudinal net distance between adjacent deep-root artificial grasses and shallow-root artificial grasses are both a / 2.

10. A construction method according to claim 9, characterized in that: The value a is determined by the following formula: Where D1 is the root diameter of deep-rooted artificial grass; d1 is the root diameter of shallow-rooted artificial grass; ξ is the local resistance coefficient; θ is the slope gradient; Re is the Reynolds number; k1-k7 are fitting coefficients, which are 4.87, 3.53, -0.49, 6.58, -0.21, 0.33 and -0.38 respectively.

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