Steep slope roadbed structure and construction method

Abstract

The present application relates to a steep slope roadbed structure and construction method, which comprises the following steps: laying out a line position, excavating a roadbed on the side of a mountain, the excavated roadbed serving as a construction passage; determining a slope ratio and height of an upper slope and performing protection on the upper slope; determining a height of a retaining wall and a height of a fill slope filled on the retaining wall; determining a structure form of the retaining wall, including a prefabricated arch retaining wall, a frame-type retaining wall or a reinforced soil retaining wall, determining a construction operation platform and a construction excavation line of the retaining wall, constructing the retaining wall, filling the fill slope on the retaining wall to the construction passage, and constructing a formed road. The present application can quickly determine systematic treatment measures according to the height of a slope, the nature of rock and soil and the base condition, the retaining structure is constructed by using a prefabricated structure, has the advantages of rapid construction and mature construction means, and the technology can be replicated and popularized, thereby providing a systematic solution for the slope treatment of steep road sections.

Description

Technical Field

[0001] This invention relates to the field of roadbed technology, and in particular to a roadbed structure and construction method for steep slopes. Background Technology

[0002] Steep and treacherous slope sections often employ a roadbed design where one side is excavated from the mountainside, while the other side uses a retaining structure. This approach is constrained by the construction area, construction sequence, and geological conditions. Key challenges include determining the excavation slope ratio and height of the upper slope, and selecting the type and height of the retaining structure on the lower slope. These issues must not only ensure slope stability but also consider ease of construction and rapid setup to adapt to the challenging nature of mountain road construction and the frequent occurrence of geological disasters. Summary of the Invention

[0003] The purpose of this invention is to provide a method for constructing and building a roadbed on steep slopes, addressing the problems existing in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] In a first aspect, the present invention provides a method for constructing a roadbed structure on a steep slope, comprising the following steps:

[0006] S1. Set out the alignment, excavate the roadbed on the mountainside with an excavation width of not less than 3m, and use the excavated roadbed as a construction access road.

[0007] S2. Determine the slope ratio and height of the excavated upper slope and carry out protection of the upper slope. The slope ratio and height of the upper slope are determined based on the properties of the soil and rock along the line, structural characteristics, degree of fissure development, hydrogeological conditions, and stability of the slope along the line. The slope ratio is 1:0.1 to 1:1.25. Several slope platforms are set at intervals along the slope direction of the upper slope.

[0008] S3. Based on the properties of the fill material, topography, geology, and environment, determine the form of the lower slope. The lower slope includes a retaining wall and a fill slope built on the retaining wall. The height of the fill slope is 4 to 8 meters, and the slope ratio of the fill slope is 1:1.5 to 1:1.75.

[0009] S4. Determine the structural form of the retaining wall based on the lower slope height, soil and rock properties, and foundation conditions, including prefabricated arch retaining wall, assembled frame retaining wall, or reinforced soil retaining wall. Propose a retaining wall construction platform and retaining wall construction excavation line. Construct the retaining wall, fill the soil slope on the retaining wall to the construction passage, and construct the formed road.

[0010] The method for constructing a steep slope roadbed, as described in this invention, involves excavation on one side and support on the other. It allows for the rapid development of systematic treatment measures based on slope height, soil and rock properties, and foundation conditions. The support structure utilizes prefabricated arch retaining walls, assembled frame retaining walls, or reinforced soil retaining walls, offering advantages such as rapid construction and mature construction methods. The technology is replicable and scalable, providing a systematic solution for slope treatment in steep road sections.

[0011] As a preferred technical solution of the present invention, in step S2, the slope ratio of the upper slope of the crushed, gravelly soil and soil is 1:0.75 to 1:1.25, the slope ratio of the upper slope of the phyllite and phyllite slate is 1:0.5 to 1:0.75, and the slope ratio of the upper slope of the limestone, granite, slate and syenite is 1:0.1 to 1:0.5.

[0012] As a preferred technical solution of the present invention, in step S2, for the upper slope of gravel, pebble soil and soil, a slope platform is set every 6 to 8 meters in height; for the upper slope of soft, easily weathered rock, a slope platform is set every 8 to 10 meters in height; and for the upper slope of hard rock, a slope platform is set every 10 to 20 meters in height.

[0013] As a preferred technical solution of the present invention, in step S2, the upper slope is reinforced and protected by setting grouting anchor rods, the grouting anchor rods are connected to an external anchor structure, and the external anchor structure is set on the surface of the upper slope.

[0014] As a further preferred technical solution of the present invention, the length of the grouting anchor is determined according to the properties of the slope soil and rock, and the grouting anchor is 6 meters, 9 meters or 12 meters long.

[0015] As a further preferred technical solution of the present invention, the outer anchor structure adopts a prefabricated cross-shaped steel-concrete structure.

[0016] As a preferred technical solution of the present invention, in step S3, the backfill slope is reinforced according to the properties of the backfill material, the slope ratio, and the height.

[0017] Secondly, the present invention also provides a steep slope roadbed structure, constructed using the construction method of the steep slope roadbed structure described in any of the above claims. The retaining wall is a prefabricated arch retaining wall, which includes a plurality of bored piles. The bored piles are spaced apart along the line direction at the construction platform of the retaining wall. A prefabricated retaining plate is attached to the outer side of the bored pile. The bored pile and the prefabricated retaining plate extend into the foundation. A plurality of connecting arch members are connected to the inner sides of two adjacent bored piles. The connecting arch members are vertically stacked from the construction platform of the retaining wall toward the top of the bored pile. The arch of the connecting arch members faces the construction excavation line of the retaining wall. A prefabricated drainage plate is provided between the connecting arch members and the construction excavation line of the retaining wall. The tops of the prefabricated retaining plate, the bored pile, the connecting arch members, and the prefabricated drainage plate are all connected to prefabricated cover plates. The backfill slope is provided on the prefabricated cover plates.

[0018] The steep slope roadbed structure described in this invention features a prefabricated arch retaining wall that extends into the foundation via a sheet pile structure formed by bored piles and precast retaining plates, providing support. The fill is supported by connecting arch members and precast drainage boards. The hollow portion formed by the connecting arch members reduces structural weight, while the precast drainage boards facilitate drainage and prevent fill from intruding into the retaining structure. The precast cover plate supports the fill slope surface. All components—the precast retaining plates, connecting arch members, precast drainage boards, and precast cover plates—are precast reinforced concrete structures, allowing for rapid assembly after the bored piles are installed to form the retaining structure. This steep slope roadbed structure is suitable for road sections with upper slope excavation and lower slope heights of 14m or more.

[0019] As a preferred technical solution of the present invention, the arch component includes an arch ring and arch seats connected to both ends of the arch ring.

[0020] Thirdly, the present invention also provides a steep slope roadbed structure, which is constructed using the construction method of the steep slope roadbed structure described in any of the above claims. The retaining wall is a prefabricated frame retaining wall, which includes several prefabricated frames. Each prefabricated frame has a cavity that runs vertically through it. The prefabricated frames are located at the construction platform of the retaining wall. All the prefabricated frames are configured as at least two rows of straight-back gravity retaining wall structures. The height of the front wall is not less than half the height of the rear wall. The last row of walls is fitted with a prefabricated drainage board. The prefabricated frames are filled with filler material, and the fill slope is set on the prefabricated drainage board.

[0021] The wall furthest from the excavation line of the retaining wall is the front wall, and the wall closest to the excavation line of the retaining wall is the rear wall. Each row of walls has several layers of the prefabricated assembled frames, and each layer has several prefabricated assembled frames.

[0022] The steep slope roadbed structure described in this invention comprises a prefabricated frame retaining wall formed by an array of prefabricated frames, creating at least two rows of walls. Each prefabricated frame is a hollow structure with vertically continuous walls, filled with filler material to form a straight-back gravity retaining wall structure. The prefabricated frame is a prefabricated reinforced concrete structure, allowing for rapid on-site assembly. Prefabricated drainage boards facilitate drainage and prevent soil intrusion into the retaining structure. The front wall height is not less than half the rear wall height, effectively controlling the wall's stability and preventing collapse. This steep slope roadbed structure is suitable for road sections with excavated upper slopes and lower slopes of 14m or more, and where the foundation conditions are relatively weak.

[0023] As a preferred technical solution of the present invention, the filler material in the prefabricated assembly frame is a material with good water permeability and easy compaction.

[0024] Fourthly, the present invention also provides a steep slope roadbed structure, which is constructed using the construction method of the steep slope roadbed structure described in any of the above claims. The retaining wall is a reinforced soil retaining wall, which is located at the construction platform of the retaining wall. The reinforced soil retaining wall includes a precast drainage board, which is set along the construction excavation line of the retaining wall. Several tie strips are provided at intervals along the height direction of the precast drainage board, and the tie strips are embedded in the reinforced soil retaining wall.

[0025] The steep slope roadbed structure described in this invention uses a reinforced soil retaining wall with tie strips arranged through prefabricated drainage boards. The friction between the tie strips and the soil improves the soil deformation conditions and enhances the engineering properties of the soil, thereby stabilizing the soil. Drainage is achieved through the prefabricated drainage boards. This steep slope roadbed structure is suitable for road sections with upper slope excavation and lower slope height within 14m and weak foundation conditions.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0027] 1. The present invention describes a method for constructing a roadbed on a steep slope. On a steep slope, one side is excavated and the other side is supported. Systematic treatment measures can be quickly formulated according to the slope height, soil and rock properties and foundation conditions. The support structure adopts prefabricated arch retaining wall, assembled frame retaining wall or reinforced soil retaining wall, which has the advantages of rapid construction and mature construction methods. The technology is replicable and scalable, providing a systematic solution for slope treatment of steep road sections.

[0028] 2. The steep slope roadbed structure of the present invention includes a prefabricated arch retaining wall that extends into the foundation through a sheet pile structure formed by the bored piles and the prefabricated retaining plate, providing support. The fill is supported by the connecting arch members and the prefabricated drainage plate. The hollow portion formed by the connecting arch members reduces the structural weight. The prefabricated drainage plate facilitates drainage and prevents fill from intruding into the retaining structure. The prefabricated cover plate supports the slope surface of the fill. The prefabricated retaining plate, the connecting arch members, the prefabricated drainage plate, and the prefabricated cover plate are all prefabricated reinforced concrete structures that can be quickly assembled after the bored piles are constructed to form the retaining structure. This steep slope roadbed structure is suitable for road sections with an upper slope excavation and a lower slope height of 14m or more.

[0029] 3. The steep slope roadbed structure of the present invention comprises a prefabricated frame retaining wall formed by an array of prefabricated frames to form at least two rows of walls. The prefabricated frames are hollow structures that run vertically through each other and are filled with filler material to form a straight-back gravity retaining wall structure. The prefabricated frames are prefabricated reinforced concrete structures that can be quickly assembled on site. The prefabricated drainage boards are used for drainage and to prevent fill soil from intruding into the retaining structure. The height of the front wall is not less than half the height of the rear wall, which can effectively control the wall from collapsing and form a retaining structure. This steep slope roadbed structure is suitable for road sections with upper slope excavation and lower slope height of 14m or more, and with weak foundation conditions.

[0030] 4. The steep slope roadbed structure of the present invention, wherein the reinforced soil retaining wall is provided with the tie strips through the prefabricated drainage board, and the friction between the tie strips and the soil is used to improve the soil deformation conditions and improve the engineering properties of the soil, thereby achieving the effect of stabilizing the soil, and drainage is carried out through the prefabricated drainage board; this steep slope roadbed structure is suitable for road sections with upper slope excavation and lower slope height within 14m and weak foundation conditions. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the process of the present invention;

[0032] Figure 2 This is a schematic diagram of the cross-section of the first type of steep slope roadbed structure;

[0033] Figure 3 for Figure 2 Sectional view of AA;

[0034] Figure 4 This is a structural schematic diagram of a connecting arch component;

[0035] Figure 5 This is a schematic diagram of the cross-section of the second type of steep slope roadbed structure;

[0036] Figure 6 This is a structural diagram of a prefabricated assembled frame;

[0037] Figure 7 This is a schematic diagram of the cross-section of the third type of steep slope roadbed structure.

[0038] Markings in the diagram: 1-Construction access road, 2-Upper slope, 3-Grouting anchor bolt, 4-Retaining wall construction work platform, 5-Retaining wall construction excavation line, 6-Precast retaining slab, 7-Drilled pile, 8-Connecting arch component, 81-Arch ring, 82-Arch seat, 9-Precast drainage board, 10-Precast cover plate, 11-Soil fill slope, 12-Road, 13-Precast assembled frame, 14-Reinforced soil retaining wall. Detailed Implementation

[0039] The present invention will now be described in detail with reference to the accompanying drawings.

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0041] Example 1

[0042] like Figures 1 to 7 As shown, the construction method of a steep slope roadbed structure according to the present invention includes the following steps:

[0043] S1. Set up a reasonable alignment, excavate the roadbed on the mountainside with an excavation width of not less than 3m, and use the excavated roadbed as a construction access road 1.

[0044] S2. Determine the slope ratio and height of the excavated upper slope 2, and carry out protection of the upper slope 2.

[0045] The slope ratio and height of the upper slope 2 are determined comprehensively based on the properties of the soil and rock along the route, structural characteristics, degree of fissure development, hydrogeological conditions, and the stability of the original roadside slopes.

[0046] Specifically, the slope ratio for gravelly soil and soil slopes is generally 1:0.75 to 1:1.25; the slope ratio for phyllite and slate slopes is 1:0.5 to 1:0.75; and the slope ratio for limestone, granite, slate, and syenite slopes is 1:0.1 to 1:0.5. For gravelly soil and soil slopes, a slope platform is generally set every 6 to 8 meters in height, with a platform width of 2 meters. For soft, easily weathered rock slopes, a slope platform is generally set every 8 to 10 meters in height, with a platform width of 2 meters. For hard rock slopes, the slope platform width can be increased to every 10 to 20 meters in height, with a platform width of 2 meters, to reduce the amount of excavation.

[0047] The upper slope 2 is reinforced and protected by grouting anchors 3. The length of the grouting anchors 3 is determined according to the properties of the slope soil and rock. For example, the length of the grouting anchors 3 is set to 6 meters, 9 meters or 12 meters. The grouting anchors 3 are connected to an external anchor structure. The external anchor structure is set on the surface of the upper slope 2. The external anchor structure adopts a precast cross-shaped steel-concrete structure, wherein the concrete can be poured in a mold later.

[0048] S3. Based on the properties of the fill material, topography, geology, environment, etc., the form of the lower slope is comprehensively determined. The lower slope includes a retaining wall and a fill slope 11 built on the retaining wall. The height of the fill slope 11 should be 4 meters to 8 meters, and the slope ratio of the fill slope 11 should be 1:1.5 to 1:1.75. The fill slope 11 can be reinforced according to the properties of the fill material, slope ratio, height and other factors.

[0049] S4. Determine the structural form of the retaining wall based on the lower slope height, soil and rock properties, and foundation conditions, including prefabricated arch retaining wall, assembled frame retaining wall, or reinforced soil retaining wall 14. Propose the retaining wall construction work platform 4 and the retaining wall construction excavation line 5. Construct the retaining wall, fill the earthwork slope 11 on the retaining wall to the construction passage 1, and construct the formed road 12. The roadbed of the road 12 is reinforced.

[0050] The method for constructing a steep slope roadbed described in this embodiment involves excavation on one side and support on the other. It allows for the rapid formulation of systematic treatment measures based on the slope height, soil and rock properties, and foundation conditions. The support structure adopts prefabricated arch retaining walls, assembled frame retaining walls, or reinforced soil retaining walls 14, which have the advantages of rapid construction and mature construction methods. The technology is replicable and scalable, providing a systematic solution for slope treatment of steep road sections.

[0051] Example 2

[0052] like Figures 2 to 4 As shown, the steep slope roadbed structure of the present invention is constructed using the construction method of the steep slope roadbed structure described in Example 1, wherein the retaining wall is a prefabricated arch retaining wall.

[0053] like Figure 2 and Figure 3 As shown, the prefabricated arch retaining wall includes several bored piles 7, which are spaced apart along the line direction at the construction platform 4 of the retaining wall. A prefabricated retaining plate 6 is attached to the outside of the bored pile 7, and the bored pile 7 and the prefabricated retaining plate 6 extend into the foundation.

[0054] like Figure 3 and Figure 4As shown, several arch members 8 are connected to the inner sides of two adjacent bored piles 7. Each arch member 8 includes an arch ring 81 and an arch seat 82 connected to both ends of the arch ring 81. The two arch seats 82 are respectively attached to the two adjacent bored piles 7. The arch of the arch member 8 faces the construction excavation line 5 of the retaining wall.

[0055] like Figure 2 and Figure 3 As shown, the arch-connecting member 8 is vertically stacked from the retaining wall construction platform 4 to the top of the bored pile 7. A prefabricated drainage board 9 is provided between the arch-connecting member 8 and the excavation line 5 of the retaining wall construction. The tops of the prefabricated retaining board 6, the bored pile 7, the arch-connecting member 8 and the prefabricated drainage board 9 are all connected to prefabricated cover plates 10 to form a support structure.

[0056] like Figure 2 As shown, the fill slope 11 is constructed at the support structure, and the fill slope 11 fills the cavity between the precast drainage board 9, the retaining wall construction platform 4 and the retaining wall construction excavation line 5. The slope surface of the fill slope 11 is set on the precast cover plate 10.

[0057] Among them, the precast retaining plate 6, the connecting arch member 8, the precast drainage plate 9 and the precast cover plate 10 are all precast reinforced concrete structures.

[0058] This embodiment describes a steep slope roadbed structure. The prefabricated arch retaining wall extends into the foundation through a sheet pile structure formed by the bored piles 7 and the prefabricated retaining plate 6, providing support. The fill is supported by the connecting arch member 8 and the prefabricated drainage plate 9. The hollow part formed by the connecting arch member 8 reduces the structural weight, and the prefabricated drainage plate 9 drains water and prevents fill from intruding into the retaining structure. The slope surface of the fill slope 11 is supported by the prefabricated cover plate 10. The prefabricated retaining plate 6, the connecting arch member 8, the prefabricated drainage plate 9, and the prefabricated cover plate 10 are all prefabricated reinforced concrete structures that can be quickly assembled after the bored piles 7 are constructed to form the retaining structure. This steep slope roadbed structure is suitable for road sections with an upper slope excavation and a lower slope height of 14m or more.

[0059] Example 3

[0060] like Figure 5 and Figure 6 As shown, the steep slope roadbed structure of the present invention is constructed using the construction method of the steep slope roadbed structure described in Example 1, wherein the retaining wall is an assembled frame retaining wall.

[0061] like Figure 5As shown, the prefabricated frame retaining wall includes several prefabricated frames 13, each of which has a through cavity running vertically, such as... Figure 6 As shown.

[0062] like Figure 5 As shown, the prefabricated assembly frame 13 is located at the retaining wall construction platform 4. All the prefabricated assembly frames 13 are configured as at least two rows of straight-back gravity retaining wall structures. The one farther away from the retaining wall construction excavation line 5 is the front wall, and the one closer to the retaining wall construction excavation line 5 is the rear wall. Several layers of the prefabricated assembly frame 13 are stacked in each row of walls, and each layer has several prefabricated assembly frames 13.

[0063] like Figure 5 As shown, the height of the front wall is not less than half the height of the rear wall, and the last row of walls is fitted with prefabricated drainage boards 9. The prefabricated assembly frame 13 is filled with filler material, which is made of permeable and easily compacted material to form a support structure.

[0064] like Figure 5 As shown, the fill slope 11 is constructed at the support structure, and the fill slope 11 fills the cavity between the precast drainage board 9, the retaining wall construction platform 4 and the retaining wall construction excavation line 5. The slope surface of the fill slope 11 is set on the precast drainage board 9.

[0065] This embodiment describes a steep slope roadbed structure. The prefabricated frame retaining wall is formed by an array of several prefabricated frames 13 to form at least two rows of walls. The prefabricated frames 13 are hollow structures that run vertically through each other and are filled with filler material to form a straight-back gravity retaining wall structure. The prefabricated frames 13 are prefabricated reinforced concrete structures that can be quickly assembled on site. The prefabricated drainage boards 9 are used for drainage and to prevent backfill from intruding into the retaining structure. The height of the front wall is not less than half the height of the rear wall, which can effectively control the wall from collapsing and form a retaining structure. This steep slope roadbed structure is suitable for road sections with upper slope excavation and lower slope height of 14m or more, and with weak foundation conditions.

[0066] Example 4

[0067] like Figure 7 As shown, the steep slope roadbed structure of the present invention is constructed using the construction method of the steep slope roadbed structure described in Example 1, wherein the retaining wall is a reinforced soil retaining wall 14.

[0068] like Figure 7As shown, the reinforced soil retaining wall 14 is located at the retaining wall construction platform 4. The reinforced soil retaining wall 14 includes a precast drainage board 9. The precast drainage board 9 is set along the excavation line 5 of the retaining wall construction. Several tie strips are spaced apart along the height direction of the precast drainage board 9. The tie strips are buried in the reinforced soil retaining wall 14.

[0069] like Figure 7 As shown, the fill slope 11 is constructed on the reinforced soil retaining wall 14. The fill slope 11 fills the cavity between the precast drainage slab 9 and the original slope. The slope surface of the fill slope 11 is located on the reinforced soil retaining wall 14.

[0070] This embodiment describes a steep slope roadbed structure. The reinforced soil retaining wall 14 is equipped with tie strips arranged through the prefabricated drainage board 9. The friction between the tie strips and the soil improves the soil deformation conditions and enhances the engineering properties of the soil, thereby stabilizing the soil. Drainage is carried out through the prefabricated drainage board 9. This steep slope roadbed structure is suitable for road sections with upper slope excavation and lower slope height within 14m and weak foundation conditions.

[0071] 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 within the protection scope of the present invention.

Claims

1. A method for constructing a roadbed structure on a steep slope, characterized in that, Includes the following steps: S1. Set out the alignment, excavate the roadbed on the mountainside, with an excavation width of not less than 3m, and use the excavated roadbed as a construction passage (1); S2. Determine the slope ratio and height of the excavated upper slope (2) and carry out protection of the upper slope (2). The slope ratio and height of the upper slope (2) are determined according to the properties of the soil and rock along the line, structural characteristics, degree of fissure development, hydrogeological conditions, and stability of the slope along the line. The slope ratio is 1:0.1 to 1:1.

25. Several slope platforms are set at intervals along the slope direction of the upper slope (2). The slope ratio of the upper slope (2) of crushed, gravelly soil and soil is 1:0.75 to 1:1.25; the slope ratio of the upper slope (2) of phyllite and phyllite slate is 1:0.5 to 1:0.75; and the slope ratio of the upper slope (2) of limestone, granite, slate and syenite is 1:0.1 to 1:0.

5. For the upper slope (2) of gravel, pebble soil and soil, a first-level slope platform is set every 6 to 8 meters high; for the upper slope (2) of soft, easily weathered rock, a first-level slope platform is set every 8 to 10 meters high; for the upper slope (2) of hard rock, a first-level slope platform is set every 10 to 20 meters high. S3. Based on the properties of the fill material, topography, geology and environment, determine the form of the lower slope. The lower slope includes a retaining wall and a fill slope (11) built on the retaining wall. The height of the fill slope (11) is 4 meters to 8 meters and the slope ratio of the fill slope (11) is 1:1.5 to 1:1.

75. S4. Based on the height of the lower slope, the properties of the soil and rock and the foundation conditions, quickly formulate systematic treatment measures, determine the structural form of the retaining wall, the retaining wall includes prefabricated arch retaining wall, assembled frame retaining wall or reinforced soil retaining wall (14), formulate the retaining wall construction operation platform (4) and the retaining wall construction excavation line (5), construct the retaining wall, fill the soil slope (11) on the retaining wall to the construction passage (1), and construct the formed road (12).

2. The construction method for steep slope roadbed structure according to claim 1, characterized in that, In step S2, the upper slope (2) is reinforced and protected by setting grouting anchor rods (3). The grouting anchor rods (3) are connected to the outer anchor structure, which is set on the surface of the upper slope (2).

3. The construction method for steep slope roadbed structure according to claim 2, characterized in that, The length of the grouting anchor (3) is determined according to the properties of the slope soil and rock, and the grouting anchor (3) is 6 meters, 9 meters or 12 meters long.

4. The construction method for steep slope roadbed structure according to claim 2, characterized in that, The external anchor structure adopts a prefabricated cross-shaped steel-concrete structure.

5. The method for constructing a steep slope roadbed according to any one of claims 1-4, characterized in that, In step S3, the backfill slope (11) is reinforced according to the properties of the backfill material, slope ratio, and height.

6. A roadbed structure for steep slopes, characterized in that, The retaining wall is constructed using the construction method for steep slope roadbed as described in any one of claims 1-5. The retaining wall is a prefabricated arch retaining wall, comprising several bored piles (7). The bored piles (7) are spaced apart along the road direction at the construction platform (4) of the retaining wall. Precast retaining plates (6) are abutted against the outer side of each bored pile (7). The bored piles (7) and the precast retaining plates (6) extend into the foundation. Several connecting arch members (8) connect the inner sides of adjacent bored piles (7). The arch component (8) is vertically stacked from the retaining wall construction platform (4) to the top of the bored pile (7). The arch of the arch component (8) faces the excavation line (5) of the retaining wall. A prefabricated drainage board (9) is provided between the arch component (8) and the excavation line (5) of the retaining wall. The top of the prefabricated retaining board (6), the bored pile (7), the arch component (8) and the prefabricated drainage board (9) are all connected to a prefabricated cover plate (10). The backfill slope (11) is provided on the prefabricated cover plate (10).

7. A roadbed structure for steep slopes, characterized in that, The retaining wall is constructed using the construction method of steep slope roadbed as described in any one of claims 1-5. The retaining wall is a prefabricated frame retaining wall, which includes several prefabricated frames (13). Each prefabricated frame (13) has a cavity that runs vertically through it. The prefabricated frame (13) is located at the construction platform (4) of the retaining wall. All the prefabricated frames (13) are configured as at least two rows of straight-back gravity retaining wall structures. The height of the front wall is not less than half the height of the rear wall. The last row of walls is fitted with a prefabricated drainage board (9). The prefabricated frame (13) is filled with filler material. The fill slope (11) is set on the prefabricated drainage board (9).

8. A roadbed structure for steep slopes, characterized in that, The retaining wall is constructed using the construction method of steep slope roadbed as described in any one of claims 1-5. The retaining wall is a reinforced soil retaining wall (14). The reinforced soil retaining wall (14) is located at the construction platform (4) of the retaining wall. The reinforced soil retaining wall (14) includes a precast drainage board (9). The precast drainage board (9) is set along the construction excavation line (5) of the retaining wall. Several tie strips are provided at intervals along the height direction of the precast drainage board (9). The tie strips are buried in the reinforced soil retaining wall (14).

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