Highway slope structure in high-water-level area and construction method thereof

Abstract

The invention discloses an expressway slope structure in a high-water-level area and a construction method of the expressway slope structure. The technical problem that in the prior art, the reinforcement and drainage effects are poor is solved. The expressway slope structure in the high-water-level area comprises a concrete grid, a slope layer and a slope layer, the first flexible grid is laid on the soil matrix; the porous water guide layer is laid on the first flexible grid; the second flexible grid is laid on the porous water guide layer; the concrete grid is laid on the second flexible grid; the elastic water guide layer is laid on the second flexible grid and is filled in the cavity; the filter layer is laid on the elastic water guide layer; the water plugging layer is arranged above the filtering layer, and a water storage cavity is formed between the water plugging layer and the filtering layer; the drainage mechanism is used for draining the clear liquid filtered by the filter layer in the water storage cavity into the drainage groove; and the fixing mechanism is used for fixing the concrete grid on the soil matrix.

Description

Technical Field

[0001] The invention relates to the technical field of highway slopes in high-water-level areas, and in particular to a highway slope structure in high-water-level areas and a construction method thereof. Background Art

[0002] Generally speaking, areas with an annual average groundwater level of more than 2 meters or obvious seasonal changes in groundwater levels, and areas with large water level changes due to factors such as tides and seasonal precipitation, can be classified as high-water areas. High water levels will have a significant impact on the stability of the roadbed and slopes of highways, increasing the risk of disasters such as landslides and scours. For example, increased seepage pressure may lead to problems such as roadbed settlement and pipeline damage; drainage is difficult, and surface waterlogging is serious, affecting road use and driving safety. Therefore, high-water areas need to take special measures in roadbed design, slope protection, etc. to ensure the long-term safety and stability of highway infrastructure.

[0003] The existing slope structure in high water level areas usually uses precast concrete blocks directly spliced ​​into a mesh on the soil surface to form cavities and drainage grooves, and then fill the cavities with vegetation or gravel. In this conventional slope structure, precast concrete blocks and filling vegetation or gravel cannot effectively prevent the sliding and scouring of the soil, so there is a lack of reinforcement measures for the soil itself, and the risk of landslides cannot be reduced. In terms of drainage, drainage pipes are usually buried inside the soil foundation to drain the accumulated water inside the soil foundation. However, the drainage pipes buried inside the soil foundation are easily blocked by silt, and the drainage effect is poor. Moreover, relying solely on the internal drainage pipes cannot effectively control the seepage pressure inside the slope, which further exacerbates the risk of landslides. Therefore, for the slope design in high water level areas, we cannot simply rely on the traditional precast concrete block laying method, but need to fundamentally solve the drainage and reinforcement problems and take more systematic and comprehensive measures. Summary of the invention

[0004] The main purpose of the present invention is to provide a highway slope structure in a high water level area and a construction method thereof, so as to solve the technical problems of poor reinforcement and drainage effects in the prior art.

[0005] In order to achieve the above object, according to the first aspect of the present invention, a highway slope structure in a high water level area is provided, and the technical solution is as follows:

[0006] A highway slope structure in a high-water area includes a concrete grid having a cavity and a drainage ditch formed by splicing prefabricated concrete blocks; the slope structure also includes:

[0007] A first flexible grid, wherein the first flexible grid is laid on a soil foundation;

[0008] A porous water-conducting layer, the porous water-conducting layer is laid on the first flexible grid, and the porous water-conducting layer is formed by accumulation of particles;

[0009] A second flexible grid, wherein the second flexible grid is laid on the porous water-conducting layer; and the concrete grid is laid on the second flexible grid;

[0010] An elastic water-conducting layer, the elastic water-conducting layer is laid on the second flexible grid and filled in the cavity of the concrete grid;

[0011] A filter layer, wherein the filter layer is laid on the elastic water-conducting layer;

[0012] A water blocking layer, wherein the water blocking layer is arranged above the filter layer, and a water storage cavity is formed between the water blocking layer and the filter layer;

[0013] A drainage mechanism, the drainage mechanism is used to discharge the clear liquid in the water storage chamber after being filtered by the filter layer into a drainage ditch of the concrete grid;

[0014] A fixing mechanism is used to fix the concrete grid on the soil foundation. The fixing mechanism includes a grouting pipe that passes through the precast concrete block, the first flexible grid, the porous water-conducting layer and the second flexible grid and extends into the soil foundation.

[0015] As a further improvement of the above-mentioned highway slope structure in high water level areas: the first flexible grid, the second flexible grid and the filter layer are all metal screens with a thickness of 2 to 5 mm, the mesh number of the first flexible grid is 2 to 5 meshes, the mesh number of the second flexible grid is 6 to 12 meshes, and the mesh number of the filter layer is 14 to 28 meshes.

[0016] As a further improvement of the above-mentioned highway slope structure in high water level areas: the porous water-conducting layer has a thickness of 5 to 10 cm and is formed by the accumulation of gravel with a particle size of 1 to 3 cm.

[0017] As a further improvement of the above-mentioned highway slope structure in high water level areas: the elastic water-conducting layer is made of interwoven fibers, and its thickness in the natural state is 1 to 5 cm greater than the distance between the filter layer and the second flexible grid, and its outer edge in the natural state exceeds the inner wall of the cavity of the concrete grid by 1 to 5 cm.

[0018] As a further improvement of the above-mentioned highway slope structure in high water level areas: the elastic water-conducting layer is any one of glass fiber felt, basalt fiber felt, aramid fiber felt, carbon fiber felt, ceramic fiber felt, and polyimide fiber felt.

[0019] As a further improvement of the above-mentioned highway slope structure in high-water-level areas: the water blocking layer has a flange that matches the inner wall of the cavity of the concrete grid, and the flange is welded to the filter layer; a through hole is provided on the outer edge of the water blocking layer, and a bolt assembly that matches the through hole is provided on the precast concrete block.

[0020] As a further improvement of the above-mentioned highway slope structure in high-water-level areas: the drainage mechanism includes a drainage outlet arranged on the water-blocking layer and a drainage pipe connected to the drainage outlet, a one-way valve is provided in the drainage pipe, and the outlet of the drainage pipe faces the drainage ditch of the concrete grid; the drainage mechanism includes a plurality of groups of drainage outlets and drainage pipes arranged at intervals.

[0021] As a further improvement of the above-mentioned highway slope structure in high-water-level areas: the fixing mechanism includes grouting pipes arranged at intervals, and the tops of the grouting pipes are fastened with nuts after passing through the concrete grid.

[0022] As a further improvement of the above-mentioned highway slope structure in high-water-level areas: the fixing mechanism also includes a sleeve welded to the second flexible grid and the grouting pipe, and a groove matching the sleeve is provided at the bottom of the concrete grid.

[0023] In order to achieve the above object, according to a second aspect of the present invention, a construction method for a highway slope structure in a high water level area is provided, and the technical scheme is as follows:

[0024] The construction method of the highway slope structure in the high water level area described in the first aspect comprises the following steps:

[0025] Laying the first flexible grid on the soil base and then compacting the soil;

[0026] Spreading granular matter on the first flexible grid and compacting it to form a porous water-conducting layer;

[0027] Laying a second flexible grid on the porous water-conducting layer, and pre-fixing the second flexible grid with latches around the periphery;

[0028] Drilling a hole, then inserting a grouting pipe and welding and fixing it with a second flexible grid, and then grouting;

[0029] The construction is completed by laying the concrete grid, elastic water conducting layer, filtration layer and water blocking layer in sequence.

[0030] It can be seen that the highway slope structure in high water area and the construction method thereof of the present invention have the following advantages:

[0031] First, each structural layer in the slope structure has a special function, specifically: (1) The first flexible grid serves as the bottom support structure, providing a flat flexible support foundation for the porous water-conducting layer and other materials on the upper layer, enhancing the stability of the soil foundation, reducing the sinking or displacement of materials, and preventing the soil from shifting when laying other layers. (2) The porous water-conducting layer is formed by the accumulation of granular materials (such as gravel), forming a permeable layer, which effectively guides and drains the accumulated water, reduces the moisture of the soil, and reduces the erosion of water on the soil. (3) The second flexible grid provides additional support for the upper concrete grid and other materials on the one hand, further enhancing the stability of the slope structure, and on the other hand isolates the porous water-conducting layer from the upper concrete grid and other materials, preventing the upper materials from mixing into the lower porous water-conducting layer, and ensuring that water is discharged smoothly from the porous water-conducting layer. (4) The concrete grid is composed of prefabricated concrete blocks spliced ​​together to form a solid grid structure to provide structural strength and stability and form drainage ditches to guide the outflow of accumulated water and prevent soil erosion. (5) The elastic water-conducting layer is made of interwoven fiber materials with good elasticity and permeability. It fills the cavities of the concrete grid and can provide additional water-conducting capabilities, further improving drainage performance. (6) The filter layer is located above the elastic water-conducting layer and can filter water and prevent soil particles from entering the drainage system, ensuring smooth water flow and durable drainage effects. (7) The water-blocking layer isolates the water from other structural layers to form a water storage cavity that stores and regulates water pressure, and discharges the accumulated water through a drain pipe. (8) The drainage mechanism includes a drain port and a drain pipe. A one-way valve is set to prevent water backflow, and the filtered clear liquid is introduced into the drainage ditch of the concrete grid to remove the water in the water storage cavity and keep the slope structure dry. (9) The grouting pipe in the fixing mechanism can firmly fix the concrete grid on the soil foundation, ensure the stability of the concrete grid on the soil foundation, and prevent displacement or falling off during use.

[0032] Secondly, the design and function of each structural layer in the slope structure complement each other, jointly ensuring the stability and drainage effect of the highway slope in the high water level area, and improving the durability and safety of the overall structure. Specifically: (1) Layered structure design: adopts a multi-layer composite material design, including flexible grid, porous water-conducting layer, elastic water-conducting layer, etc. Each layer of material plays a different function, such as drainage, filtration, anti-seepage, etc., to ensure the durability and stability of drainage and extend the service life of the slope. (2) Efficient drainage design: through porous water-conducting layer, elastic water-conducting layer, etc., it can quickly and effectively drain the seepage water to prevent the slope from landslide or structural instability due to increased water pressure; cooperate with the drainage mechanism design to achieve layered and graded drainage and improve drainage efficiency; the water storage cavity design can effectively disperse the water pressure and reduce the destructive force on the slope structure. (3) Slope reinforcement and stability design: The design of the grouting pipe and the fixing mechanism can firmly fix the entire slope structure on the soil foundation; the multi-point fixing of the grouting pipe ensures the stability of the concrete grid and the flexible grid on the soil foundation, increasing the stability of the overall structure; the design of the elastic water-conducting layer can absorb the slope deformation to a certain extent and improve the overall stability; the combination of the flexible grid and the concrete grid enhances the anti-slip performance of the slope structure, which not only ensures the flexibility of the slope structure, but also provides a strong support capacity, which is suitable for complex terrain and high water level environment. (4) Filtration and anti-seepage composite design: The design of the water blocking layer can block the entry of external water and reduce the seepage pressure; the design of the filter layer can effectively filter impurities and ensure smooth drainage; the one-way valve design in the drainage mechanism ensures the unidirectionality of the water flow and avoids backflow. (5) Simple construction: The splicing and laying of prefabricated concrete blocks and multi-layer grids makes the construction process simple and flexible, reducing the complexity and construction difficulty of the slope project and facilitating on-site construction management.

[0033] In summary, the layered composite structure of the present invention has a novel design concept, fully considers the characteristics of the slopes in high water level areas, and realizes a systematic solution to reinforcement and drainage problems from multiple aspects such as drainage, reinforcement, and anti-seepage. It has a simple structure, low cost, convenient construction, and is extremely practical.

[0034] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings constituting a part of the present invention are used to assist in understanding the present invention. The contents provided in the drawings and their related descriptions in the present invention can be used to explain the present invention, but do not constitute improper limitations on the present invention. In the drawings:

[0036] Figure 1It is a side view of an embodiment of the highway slope structure in a high water level area of ​​the present invention.

[0037] Figure 2 It is a partial schematic diagram of an embodiment of the highway slope structure in a high water level area of ​​the present invention.

[0038] Figure 3 It is a front view of an embodiment of the highway slope structure in high water level area of ​​the present invention.

[0039] The relevant marks in the above drawings are:

[0040] 110-precast concrete block, 120-cavity, 130-drainage groove, 140-bolt assembly, 200-first flexible grid, 300-porous water-conducting layer, 400-second flexible grid, 500-elastic water-conducting layer, 600-filtration layer, 610-water storage cavity, 700-water blocking layer, 710-flange, 810-drainage outlet, 820-drainage pipe, 830-check valve, 910-grouting pipe, 920-sleeve. DETAILED DESCRIPTION

[0041] The present invention is described clearly and completely below in conjunction with the accompanying drawings. A person skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly noted that:

[0042] The technical solutions and technical features provided in each part of the present invention, including the following description, may be combined with each other if there is no conflict.

[0043] In addition, the embodiments of the present invention involved in the following description are generally only a part of the embodiments of the present invention, rather than all the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0044] About the terms and units in the present invention: The terms "include", "have" and any variations thereof in the description and claims of the present invention and related parts are intended to cover non-exclusive inclusions.

[0045] Figure 1 It is a side view of an embodiment of the highway slope structure in a high water level area of ​​the present invention. Figure 2 It is a partial schematic diagram of an embodiment of the highway slope structure in a high water level area of ​​the present invention. Figure 3 It is a front view of an embodiment of the highway slope structure in high water level area of ​​the present invention.

[0046] like Figure 1-3As shown, the highway slope structure in the high water level area includes a concrete grid, a first flexible grid 200, a porous water-conducting layer 300, a second flexible grid 400, an elastic water-conducting layer 500, a filtering layer 600, a water blocking layer 700, a drainage mechanism and a fixing mechanism.

[0047] The concrete grid has a cavity 120 and a drainage groove 130 formed by splicing precast concrete blocks 110, wherein the precast concrete blocks 110 have two shapes, namely, U-shaped precast concrete blocks and plate-shaped precast concrete blocks, so that they can be quickly spliced ​​into a concrete grid. It is preferred that adjacent precast concrete blocks 110 have matching steps or slots, which can not only improve construction efficiency, but also improve the overall strength of the concrete grid.

[0048] The first flexible grid 200 is laid on the soil foundation; the porous water-conducting layer 300 is laid on the first flexible grid 200, and the porous water-conducting layer 300 is formed by the accumulation of particles; the second flexible grid 400 is laid on the porous water-conducting layer 300; and the concrete grid is laid on the second flexible grid 400. The first flexible grid 200 and the second flexible grid 400 maintain the stability of the slope structure through layered support and isolation, while the porous water-conducting layer 300 ensures the high efficiency of drainage and reduces the potential harm of moisture to the soil and slope structure. Therefore, through the combination of the first flexible grid 200, the porous water-conducting layer 300 and the second flexible grid 400, it is possible to effectively manage and remove moisture, while enhancing the overall stability of the slope.

[0049] Preferably, the porous water-conducting layer 300 has a thickness of 5 to 10 cm. The porous water-conducting layer 300 of such thickness can provide sufficient space and water-conducting capacity, so that water can quickly flow into the upper drainage system through the gravel layer, reducing the possibility of water accumulation. At the same time, the porous water-conducting layer 300 of such thickness can also provide sufficient support to prevent the gravel layer from settling or deforming during use, thereby ensuring long-term effective drainage function. Preferably, the porous water-conducting layer 300 is formed by piling up gravel with a particle size of 1 to 3 cm. By controlling the piling density, a porous water-conducting layer 300 with an average pore size of about 1 to 3 cm can be formed. The porous water-conducting layer 300 formed in this way has a high water permeability, and can more effectively guide and drain water than fine sand or clay, preventing water from being retained at the slope. Moreover, the porous water-conducting layer 300 formed in this way can also reduce the clogging problem of fine particles, maintain the smooth flow of the water-conducting layer, and avoid the decrease in drainage performance due to clogging of fine particles.

[0050] The elastic water-conducting layer 500 is laid on the second flexible grid 400 and filled in the cavity 120 of the concrete grid; the elastic water-conducting layer 500 is interwoven with fibers, and its thickness in the natural state is 1 to 5 cm greater than the distance between the filter layer 600 and the second flexible grid 400, and its outer edge in the natural state exceeds the inner wall of the cavity 120 of the concrete grid by 1 to 5 cm, so that it can fit tightly with the cavity 120 after installation to prevent the elastic water-conducting layer 500 from shaking under the pressure of water flow. Preferably, the elastic water-conducting layer 500 is any one of glass fiber felt, basalt fiber felt, aramid fiber felt, carbon fiber felt, ceramic fiber felt, and polyimide fiber felt. These fiber materials have excellent corrosion resistance, durability, and compression resistance, adapt to long-term erosion of water and soil environment, and improve the service life of the overall structure. The average pore size of the elastic water-conducting layer 500 is preferably 0.5 to 1 cm, so that it can guide water more finely and has appropriate elasticity.

[0051] The filter layer 600 is laid on the elastic water-conducting layer 500; preferably, the first flexible grid 200, the second flexible grid 400 and the filter layer 600 are all metal screens with a thickness of 2 to 5 mm, the mesh number of the first flexible grid 200 is 2 to 5 meshes (aperture is 4 to 8 mm), the mesh number of the second flexible grid 400 is 6 to 12 meshes (aperture is 1.4 to 3.35 mm), and the mesh number of the filter layer 600 is 14 to 28 meshes (aperture is 0.6 to 1.18 mm). Therefore, the mesh number of the second flexible grid 400 and the filter layer 600 increases step by step, and the corresponding aperture decreases step by step, so that particulate matter can be intercepted step by step, the stability of the soil foundation is maintained, and the water flow pressure is reduced.

[0052] The water blocking layer 700 is arranged above the filter layer 600, and a water storage cavity 610 is formed between the water blocking layer 700 and the filter layer 600; the water blocking layer 700 has a flange 710 adapted to the inner wall of the cavity 120 of the concrete grid, and the flange 710 is welded to the filter layer 600, thereby having higher strength and better sealing, and the filter layer 600 is not easily damaged; the water blocking layer 700 is provided with a through hole on the outer edge, and the precast concrete block 110 is provided with a bolt assembly 140 (pre-set on the precast concrete block 110) adapted to the through hole, thereby facilitating disassembly and assembly.

[0053] The drainage mechanism is used to discharge the clear liquid in the water storage chamber 610 after being filtered by the filter layer 600 into the drainage groove 130 of the concrete grid; the drainage mechanism includes a drainage port 810 arranged on the water blocking layer 700 and a drainage pipe 820 connected to the drainage port 810, a one-way valve 830 is provided in the drainage pipe 820, and the outlet of the drainage pipe 820 faces the drainage groove 130 of the concrete grid; the drainage mechanism includes a plurality of groups of drainage ports 810 and drainage pipes 820 arranged at intervals.

[0054] The fixing mechanism is used to fix the concrete grid on the soil foundation, and the fixing mechanism includes a grouting pipe 910 that passes through the precast concrete block 110, the first flexible grid 200, the porous water-conducting layer 300 and the second flexible grid 400 and extends into the soil foundation; preferably, the fixing mechanism includes grouting pipes 910 arranged at intervals (arranged according to the size, shape, quantity and splicing method of the precast concrete block 110), and the top of the grouting pipe 910 is fastened with a nut after passing through the concrete grid, so that the reinforcement effect is good; the fixing mechanism also includes a sleeve 920 welded to the second flexible grid 400 and the grouting pipe 910, and the bottom of the concrete grid is provided with a groove adapted to the sleeve 920 (preset on the precast concrete block 110), which can further improve the structural stability.

[0055] The embodiment of the construction method of the highway slope structure in the high water level area comprises the following steps:

[0056] Laying the first flexible grid 200 on the soil base and then compacting the soil;

[0057] Spreading granules on the first flexible grid 200 and compacting them to form a porous water-conducting layer 300;

[0058] Laying a second flexible grid 400 on the porous water-conducting layer 300, and pre-fixing the second flexible grid 400 with pins around it to facilitate drilling;

[0059] Drill a hole, then insert a grouting pipe 910 into the hole and weld it to the second flexible grid 400, then inject grout into the soil base through the grouting pipe 910, and after the grout is cured, the soil base can be reinforced; the grout is made of a two-component modified epoxy polymer;

[0060] The construction is completed by laying the concrete grid, the elastic water-conducting layer 500, the filtering layer 600 and the water-blocking layer 700 in sequence.

[0061] During actual construction, the first flexible grid 200 and the second flexible grid 400 can be formed by overlapping metal screens of smaller sizes, and the overlapping width is preferably 2 to 5 cm.

[0062] A variety of soil materials commonly used in high water level areas were selected to prepare samples together with the above-mentioned slope structure. The permeability of the samples was tested according to the "Standard for Geotechnical Test Methods" (GB / T 50123-2019). The results showed that the permeability coefficient of the constant head permeability test and the permeability coefficient of the variable head permeability test at standard temperature (20°C) were k 20 Average ≥2.3×10 -3cm / s. The slope stability coefficient Fs ≥ 1.5 under normal working conditions and the slope stability coefficient Fs ≥ 1.3 under earthquake working conditions were calculated by the limit equilibrium method, which meets the requirements of the Technical Code for Building Slope Engineering (GB50330-2013).

[0063] The above is a description of the relevant contents of the present invention. A person skilled in the art will be able to implement the present invention based on these descriptions. Based on the above contents of the present invention, all other embodiments obtained by a person skilled in the art without creative work shall fall within the scope of protection of the present invention.

Claims

1. A highway slope structure in a high-water area, comprising a concrete grid having a cavity (120) and a drainage ditch (130) formed by splicing prefabricated concrete blocks (110); characterized in that: Slope structures also include: A first flexible grid (200), wherein the first flexible grid (200) is laid on a soil foundation; A porous water-conducting layer (300), wherein the porous water-conducting layer (300) is laid on the first flexible grid (200), and the porous water-conducting layer (300) is formed by accumulation of particles; A second flexible grid (400), wherein the second flexible grid (400) is laid on the porous water-conducting layer (300); and the concrete grid is laid on the second flexible grid (400); An elastic water-conducting layer (500), wherein the elastic water-conducting layer (500) is laid on the second flexible grid (400) and filled in the cavity (120) of the concrete grid; A filter layer (600), wherein the filter layer (600) is laid on the elastic water-conducting layer (500); A water blocking layer (700), wherein the water blocking layer (700) is disposed above the filter layer (600), and a water storage cavity (610) is formed between the water blocking layer (700) and the filter layer (600); A drainage mechanism, the drainage mechanism being used to discharge the clear liquid in the water storage chamber (610) after being filtered by the filter layer (600) into a drainage groove (130) of the concrete grid; A fixing mechanism is used to fix a concrete grid on a soil foundation, and the fixing mechanism comprises a grouting pipe (910) that passes through a precast concrete block (110), a first flexible grid (200), a porous water-conducting layer (300) and a second flexible grid (400) and extends into the soil foundation.

2. The highway slope structure in high water area as claimed in claim 1, characterized in that: The first flexible grid (200), the second flexible grid (400) and the filter layer (600) are all metal screens with a thickness of 2 to 5 mm, the mesh number of the first flexible grid (200) is 2 to 5 meshes, the mesh number of the second flexible grid (400) is 6 to 12 meshes, and the mesh number of the filter layer (600) is 14 to 28 meshes.

3. The highway slope structure in high water area as claimed in claim 1, characterized in that: The porous water-conducting layer (300) has a thickness of 5 to 10 cm and is formed by the accumulation of gravels with a particle size of 1 to 3 cm.

4. The highway slope structure in high water area as claimed in claim 1, characterized in that: The elastic water-conducting layer (500) is made of interwoven fibers, and its thickness in a natural state is 1 to 5 cm greater than the distance between the filter layer (600) and the second flexible grid (400), and its outer edge in a natural state exceeds the inner wall of the cavity (120) of the concrete grid by 1 to 5 cm.

5. The highway slope structure in high water area as claimed in claim 4, characterized in that: The elastic water-conducting layer (500) is any one of glass fiber felt, basalt fiber felt, aramid fiber felt, carbon fiber felt, ceramic fiber felt, and polyimide fiber felt.

6. The highway slope structure in high water area as claimed in claim 1, characterized in that: The water blocking layer (700) has a flange (710) adapted to the inner wall of the cavity (120) of the concrete grid, and the flange (710) is welded to the filter layer (600); a through hole is provided on the outer edge of the water blocking layer (700), and a bolt assembly (140) adapted to the through hole is provided on the precast concrete block (110).

7. The highway slope structure in high water area as claimed in claim 1, characterized in that: The drainage mechanism comprises a drainage port (810) arranged on the water blocking layer (700) and a drainage pipe (820) connected to the drainage port (810), wherein a one-way valve (830) is arranged in the drainage pipe (820), and the outlet of the drainage pipe (820) faces a drainage groove (130) of a concrete grid; the drainage mechanism comprises a plurality of groups of drainage ports (810) and drainage pipes (820) arranged at intervals.

8. The highway slope structure in high water area as claimed in claim 1, characterized in that: The fixing mechanism comprises grouting pipes (910) arranged at intervals, and the tops of the grouting pipes (910) are fastened with nuts after passing through the concrete grid.

9. The highway slope structure in high water area as claimed in claim 8, characterized in that: The fixing mechanism further comprises a sleeve (920) welded to the second flexible grid (400) and the grouting pipe (910), and a groove matching the sleeve (920) is provided at the bottom of the concrete grid.

10. The method for constructing a highway slope structure in a high water level area according to any one of claims 1 to 9, characterized in that: The following steps are involved: Laying a first flexible grid (200) on a soil base and then compacting the soil; Spreading granules on the first flexible grid (200) and compacting them to form a porous water-conducting layer (300); Laying a second flexible grid (400) on the porous water-conducting layer (300), and pre-fixing the second flexible grid (400) with latches around the periphery; Drilling a hole, then inserting a grouting pipe (910) and welding and fixing it to the second flexible grid (400), and then grouting; The construction is completed by laying the concrete grid, the elastic water-conducting layer (500), the filtering layer (600) and the water-blocking layer (700) in sequence.

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