Three-dimensional folded geogrid and shoulder baffle combined reinforcing structure and construction method

Abstract

The present application relates to railway ballast track reinforcement technical field, specifically to a kind of three-dimensional folding geogrid and shoulder ballast baffle combined reinforcement structure and construction method, three-dimensional folding geogrid and shoulder ballast baffle combined reinforcement structure includes geogrid and baffle, geogrid includes bottom grid and two side grids, bottom grid is arranged in the bottom of ballast bed, two side grids are arranged in the two sides of ballast bed, bottom grid and two side grids are integrated structure, baffle is obliquely arranged in the two sides of ballast bed, baffle is used to press side grid in the side of ballast bed.The geogrid and baffle of the present application interact, form an effective "rigid-flexible combination" structure, wherein the baffle provides rigid constraint, geogrid provides flexible reinforcement, both synergistic effect makes the transmission path of load in ballast be dispersed, reduces local stress concentration, effectively improves the durability and anti-deformation ability of ballast bed in long time operation.

Description

Technical Field

[0001] This invention relates to the field of railway ballast track reinforcement technology, specifically to a three-dimensional folded geogrid and shoulder ballast baffle combined reinforcement structure and construction method. Background Technology

[0002] Railway ballast is a crucial component of railway tracks, laid on both sides and beneath the sleepers, responsible for effectively transferring train loads to the foundation. Simultaneously, the ballast layer provides lateral support to the sleepers, ensuring the track's drainage and vibration damping capabilities. However, under long-term train operating loads, ballast material is prone to particle breakage, loss, and deterioration, leading to track bed settlement and irreversible deformation. This deterioration not only affects the stability and safety of train operation but also significantly increases maintenance costs and frequency, especially under high-load and high-speed train operation conditions.

[0003] Geogrids, as a novel reinforcing material, have been widely used in the reinforcement of ballast layers due to their superior tensile strength. By forming a reinforced mesh, they diffuse and disperse the load from the upper train, limiting excessive displacement of ballast particles and thus improving the overall durability and stability of the track bed. However, most geogrids are currently only laid at the bottom of the ballast layer. While they can effectively reinforce the bottom ballast under vertical loads, their lateral restraint is limited and cannot adequately contain the lateral displacement generated by the ballast during train operation. The accumulation of lateral displacement eventually leads to track deformation and uneven settlement, seriously affecting the smoothness and safety of train operation. Existing reinforcement methods, especially applying geogrids alone to the sides of the ballast, lack effective lateral pressure support, resulting in poor reinforcement effects. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a three-dimensional folded geogrid and ballast retainer combined reinforcement structure and construction method. Through the interaction between the bottom geogrid, side geogrids, and retainers, an effective "rigid-flexible combination" structure is formed. The retainers provide rigid constraints, while the geogrid provides flexible reinforcement. The synergistic effect of the two allows the load transfer path in the ballast to be dispersed, reducing local stress concentration and effectively improving the durability and deformation resistance of the track bed during long-term operation.

[0005] To address the aforementioned technical problems, this invention provides a three-dimensional folded geogrid and ballast retainer combined reinforcement structure, comprising a geogrid and retainers. The geogrid includes a bottom geogrid and two side geogrids. The bottom geogrid is arranged at the bottom of the ballast track, and the two side geogrids are respectively arranged on both sides of the ballast track. The bottom geogrid and the two side geogrids are an integral structure. The retainers are inclinedly arranged on both sides of the ballast track, and the retainers are used to press the side geogrids against the sides of the ballast track.

[0006] Furthermore, multiple upper drainage outlets are provided on the baffle, and the upper drainage outlets are arranged in the ballast section between sleepers.

[0007] Furthermore, the upper drainage outlets are arranged in multiple rows, and the upper drainage outlets are square in shape, with the side length of the upper drainage outlets being equal to the distance between two adjacent sleepers.

[0008] Furthermore, a bottom drain outlet is provided at the bottom of the baffle, and the bottom drain outlet is staggered from the upper drain outlet, with the bottom drain outlet located in the sleeper section.

[0009] Furthermore, the baffle includes multiple baffle units along the length of the ballast track bed, with adjacent baffle units spliced ​​together.

[0010] Furthermore, the bottom of the baffle is provided with an anti-slip surface, which is used to enhance the baffle's anti-slip capability.

[0011] Furthermore, it includes a plurality of reinforcing limiting pins arranged on the side grid, one end of which is inserted into the ballast track bed to fix the side grid.

[0012] Furthermore, the reinforcing limiting nail includes a nail head and multiple nail bodies. The nail head abuts against the cross intersection of the side grid, and the multiple nail bodies are inserted into the ballast bed through the corners of the four squares around the cross intersection.

[0013] Furthermore, the reinforced limiting pins are arranged in the sleeper section so that the baffle presses against the reinforced limiting pins.

[0014] Furthermore, multiple lifting rings are provided on the top of the baffle.

[0015] On the other hand, the present invention provides a construction method for a three-dimensional folded geogrid and ballast retaining wall combined reinforcement structure, comprising:

[0016] The geogrid is laid flat on the foundation surface and covered with ballast. The slope angle of the ballast side is 1:1.75.

[0017] Fold the two side grids of the geogrid upwards to the sides of the ballast, ensuring a tight fit to the sides of the ballast;

[0018] Use reinforced limiting nails to fix the two side grids at the cross intersections. The reinforced limiting nails are arranged in the sleeper section.

[0019] Align the upper drainage outlet of the baffle unit with the ballast section between sleepers and place it on the side of the ballast. Then, splice the baffle units one by one to form a baffle.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. This invention utilizes a three-dimensional folded geogrid, consisting of a bottom geogrid and two side geogrids integrated into one unit. The side geogrids not only limit sliding caused by lateral damage to the ballast and uneven settlement caused by deformation of the track bed structure, but also apply a pull-out force to the bottom geogrid. Specifically, the two side geogrids pull the bottom geogrid directly beneath the ballasted track bed, forming a stable whole through the multi-directional embedding of the three-dimensional folded geogrid. By incorporating baffles, the side geogrids receive additional lateral pressure, further enhancing their ability to limit the displacement and loss of ballast particles and increasing the pull-out force on the bottom geogrid. Furthermore, the baffles themselves also secure the sides of the ballasted track bed, further reducing track deformation and uneven settlement. Therefore, the bottom grid, side grid, and baffle of this invention interact with each other to form an effective "rigid-flexible combination" structure. The baffle provides rigid constraints, while the geogrid provides flexible reinforcement. The two work together to disperse the load transmission path in the ballast, reduce local stress concentration, and effectively improve the durability and deformation resistance of the track bed during long-term operation.

[0022] 2. The combined structure of the three-dimensional folded geogrid and baffle of the present invention has a certain vibration energy absorption capacity, which can reduce the dynamic load caused by the vibration impact on the track when the train passes, reduce the impact of noise and vibration on train operation, thereby effectively protecting the track structure, improving seismic performance, and providing a smoother and more comfortable riding experience.

[0023] 3. The baffle of the present invention is provided with multiple upper drainage outlets, which are arranged in the ballast section between sleepers, so that the sides of the sleepers can be fully supported, thereby improving the running safety of the track.

[0024] 4. By setting a bottom drainage outlet, this invention can prevent rainwater from accumulating at the bottom of the ballasted track bed and even seeping below the foundation surface, thus avoiding damage to the interior of the ballasted track bed and the foundation surface. Since the bottom drainage outlet is arranged in the sleeper section and staggered with the upper drainage outlet, it avoids the situation where the opening area of ​​a certain section of the baffle is too large and the strength is greatly reduced. Furthermore, rainwater in the sleeper section can be directly discharged from the bottom drainage outlet, and rainwater in the interslee ballast section is partly discharged directly from the upper drainage outlet and partly discharged from the bottom drainage outlet, resulting in high drainage efficiency.

[0025] 5. The side length of the upper drainage outlet of the present invention is equal to the distance between two adjacent sleepers, and the width of the bottom drainage outlet can be set to the width of the sleeper, so that the size of the drainage outlet is large enough to effectively avoid the problem of clogging the drainage hole after the ballast particles are broken, and ensure the long-term drainage performance of the track bed.

[0026] 6. The present invention uses reinforced limiting nails to fix the side grid. The reinforced limiting nails are set at the cross intersection of the side grid. The nail body of the reinforced limiting nail is inserted into the ballast bed through the corners of the four squares around the cross intersection, so that the reinforcement limiting nails fix the side grid better and help reduce the displacement and sliding of the geogrid.

[0027] 7. The reinforced limiting pins of the present invention are arranged in the sleeper section, so that the baffle presses on the reinforced limiting pins, which further improves the fixing effect of the reinforced limiting pins.

[0028] 8. The baffle of the present invention includes multiple baffle units, which can be prefabricated in the factory and then assembled on site, which is beneficial to improving construction efficiency and facilitating the compaction and replacement of local areas in the later stage.

[0029] 9. The bottom of the baffle of the present invention is provided with an anti-slip bottom surface, which enhances the lateral anti-slip ability of the baffle, further improves the reinforcement effect on the ballast track bed, and reduces the settlement deformation of the track under load. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the present invention.

[0031] Figure 2 This is a plan view of the present invention;

[0032] Figure 3 This is a cross-sectional view of the present invention;

[0033] Figure 4 This is a side view of the present invention;

[0034] Figure 5 This is a plan view of the present invention before the baffle is laid;

[0035] Figure 6 This is a schematic diagram of the structure of the geogrid of the present invention;

[0036] Figure 7 This is a schematic diagram of the connection structure between the geogrid and the ballast of the present invention;

[0037] Figure 8 This is a schematic diagram of the structure of the baffle of the present invention;

[0038] Figure 9 This is a side view of the baffle of the present invention;

[0039] Figure 10 This is a front view of the reinforced limiting nail of the present invention;

[0040] Figure 11 This is a top view of the reinforced limiting nail of the present invention;

[0041] Figure 12This is a force analysis diagram of the present invention;

[0042] Figure 13 This is a flowchart illustrating the construction process of the present invention.

[0043] Figure 14 This is a schematic diagram of the ballast track bed model of the present invention;

[0044] Figure 15 This is the displacement vector diagram of section Y1 of the present invention;

[0045] Figure 16 This is a contact force chain distribution diagram of section Y1 of the present invention;

[0046] Figure 17 The lateral resistance of the track bed is given when the lateral displacement is 2mm according to the present invention.

[0047] Reference numerals: Geogrid 1; Bottom grid 11; Side grid 12; Reinforced limiting nail 2; Nail head 21; Nail body 22; Ballast track 3; Baffle 4; Baffle unit 41; Upper drainage outlet 42; Bottom drainage outlet 43; Anti-slip bottom surface 44; Lifting ring 45; Joint 46; Foundation surface 7; Sleeper 8. Detailed Implementation

[0048] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0049] like Figure 1 , 2 As shown, the present invention provides a three-dimensional folded geogrid and ballast retaining plate combined reinforcement structure, including geogrid 1 and retaining plate 4, as shown. Figure 3 , 7 As shown, the geogrid 1 includes a bottom grid 11 and two side grids 12. The bottom grid 11 is arranged at the bottom of the ballasted track bed 3, and the two side grids 12 are respectively arranged on both sides of the ballasted track bed 3. The bottom grid 11 and the two side grids 12 are an integral structure, as shown. Figure 7 As shown, this is the initial state of geogrid 1 before construction. After construction, geogrid 1 wraps around the bottom and sides of the ballast. Figure 3 As shown, baffles 4 are arranged obliquely on both sides of the ballast track 3, and baffles 4 are used to press the side grids 12 against the sides of the ballast track 3.

[0050] Understandably, the integrated bottom grid 11 and two side grids 12 form a three-dimensional folded geogrid 1. The side grids 12 can both limit the sliding caused by lateral damage to the ballast and the uneven settlement caused by deformation of the track bed structure, and also apply a pull-out force to the bottom grid 11. That is, the two side grids 12 pull the bottom grid 11 directly below the ballasted track bed 3, forming a stable whole through the multi-directional embedding of the three-dimensional folded geogrid 1. By setting the baffle 4, the side grids 12 receive additional lateral pressure, making the side grids 12 more capable of limiting the displacement and loss of ballast particles, and also stronger in terms of the pull-out force on the bottom grid 11. Furthermore, the baffle 4 itself can also secure the two sides of the ballasted track bed 3, further reducing track deformation and uneven settlement of the ballasted track bed 3. Figure 12 As shown, the geogrid 1 is under tension as a whole and is subjected to compressive stress from the baffle 4. The bottom grid 11, the side grid 12, and the baffle 4 interact with each other to form an effective "rigid-flexible combination" structure. The baffle 4 provides rigid constraints, while the geogrid 1 provides flexible reinforcement. The two work together to disperse the load transfer path in the ballast, reduce local stress concentration, and effectively improve the durability and deformation resistance of the track bed during long-term operation.

[0051] In addition, the combined structure of the three-dimensional folded geogrid 1 and the baffle 4 has a certain vibration energy absorption capacity, which can reduce the dynamic load caused by the vibration impact on the track when the train passes, reduce the impact of noise and vibration on train operation, thereby effectively protecting the track structure, improving seismic performance, and providing a smoother and more comfortable riding experience.

[0052] like Figure 6 As shown, the geogrid 1 of this application uses a bidirectional geogrid, but triaxial geogrids, novel geogrids, and other types of geogrids that can meet the reinforcement requirements can also be used.

[0053] To ensure the drainage capacity of the ballast track 3, in some embodiments, such as... Figure 8 As shown, multiple upper drainage outlets 42 are provided on the baffle 4. The upper drainage outlets 42 are arranged in the ballast section between sleepers. For example, Figure 2 As shown, the ballast section between sleepers is the section between two adjacent sleepers 8, and the sleeper section is the section where the width of sleeper 8 is located.

[0054] Understandably, since the upper drainage outlet 42 is located in the ballast section between sleepers, the sides of the sleeper 8 can be fully supported, that is, the ballast within the sleeper section can be fully supported, thereby improving the operational safety of the track.

[0055] Furthermore, the upper drainage outlets 42 can be arranged in two rows. The upper drainage outlets 42 are square, and the side length of the upper drainage outlets 42 is equal to the distance between two adjacent sleepers 8. Since the side length of the upper drainage outlets 42 is equal to the distance between two adjacent sleepers 8, the size of the upper drainage outlets 42 is large enough to effectively avoid the problem of clogging the drainage holes after the ballast particles are broken, thus ensuring the long-term drainage performance of the track bed.

[0056] To further improve the drainage capacity of the ballasted track bed 3, in some embodiments, a bottom drainage outlet 43 is provided at the bottom of the baffle 4. The bottom drainage outlet 43 is staggered from the upper drainage outlet 42 and is located in the sleeper section. The width of the bottom drainage outlet 43 can be set to the width of the sleeper 8 to maximize drainage efficiency.

[0057] Understandably, the bottom drainage outlet 43 can prevent rainwater from accumulating at the bottom of the ballasted track bed 3, or even seeping below the foundation surface 7, causing damage to the interior of the ballasted track bed 3 and the foundation surface 7. Since the bottom drainage outlet 43 is arranged in the sleeper section and staggered with the upper drainage outlet 42, it avoids the situation where the opening area of ​​a certain section of the baffle 4 is large and the strength is greatly reduced. In addition, rainwater in the sleeper section can be directly discharged from the bottom drainage outlet 43, and part of the rainwater in the ballast section between sleepers is discharged directly from the upper drainage outlet 42, and the other part is discharged from the bottom drainage outlet 43, resulting in high drainage efficiency.

[0058] To facilitate the construction and subsequent maintenance of the baffle 4, the baffle 4 includes multiple baffle units 41 along the length of the ballasted track bed 3, with adjacent baffle units 41 spliced ​​together. For example... Figure 8 , 9 As shown, the splicing interfaces 46 of the baffle unit 41 are staggered at both ends of the baffle unit 41, allowing adjacent baffle units 41 to be spliced ​​end to end. The splicing interfaces 46 have a stepped structure, which enables adjacent baffle units 41 to provide vertical and lateral resistance to each other, improving the overall integrity of the baffle 4. The baffle units 41 can be prefabricated in the factory and then spliced ​​on site, which is beneficial to improving construction efficiency and facilitating the compaction and replacement of local areas later.

[0059] The baffle 4 of this application is placed directly on the foundation surface 7. In order to improve the anti-slip ability of the baffle 4, an anti-slip bottom surface 44 is provided at the bottom of the baffle 4. The anti-slip bottom surface 44 can be an anti-slip agent, an anti-slip rubber pad, or a rough sanding surface arranged at the bottom of the baffle 4, thereby ensuring the reinforcement effect of the baffle 4 on the ballast track bed 3 and reducing the settlement deformation of the track under load.

[0060] In some embodiments, a plurality of reinforcing limiting nails 2 are arranged on the side grid 12, one end of which is inserted into the ballast track 3 to fix the side grid 12. The geogrid 1 is fixedly connected to the ballast track 3 by the reinforcing limiting nails 2, which improves the integrity of the geogrid 1 and the ballast track 3.

[0061] Furthermore, in order to improve the reinforcement effect of the reinforced limiting nail 2, such as... Figure 10 , 11 As shown, the reinforced limiting nail 2 includes a nail head 21 and multiple nail bodies 22, as follows: Figure 7 As shown, the nail head 21 is pressed against the cross intersection of the side grid 12, and multiple nails 22 are inserted into the ballast bed 3 through the corners of the four squares around the cross intersection.

[0062] To further improve the reinforcement effect of the reinforced limiting nail 2, the reinforced limiting nail 2 is arranged in the sleeper section so that the baffle 4 presses on the reinforced limiting nail 2.

[0063] The reinforced limiting nail 2 has a different structure from conventional geogrid fixing nails. It has four nail bodies 22 and is long enough to effectively drive into the ballast and lock the geogrid 1. The reinforced limiting nail 2 can be made of the same material as railway spikes to ensure sufficient rigidity.

[0064] In some embodiments, a plurality of lifting rings 45 are provided on the top of the baffle 4 to facilitate the movement of the baffle 4.

[0065] like Figure 13 As shown, the present invention also provides a construction method for a three-dimensional folded geogrid and ballast retaining plate combined reinforcement structure, comprising:

[0066] The geogrid 1 is laid flat on the foundation surface 7, and ballast is covered on it. The slope angle of the side of the ballast is 1:1.75.

[0067] Fold the two side grids 12 of the geogrid 1 upwards to the sides of the ballast, ensuring a tight fit against the sides of the ballast. Figure 5 As shown;

[0068] like Figure 7 As shown, reinforced limiting nails 2 are driven into the cross intersection of the side grids 12 to fix the two side grids 12. The reinforced limiting nails 2 are arranged in the sleeper section.

[0069] like Figure 4 As shown, the upper drainage outlet 42 of the baffle unit 41 is aligned with the ballast section between the sleepers and placed on the side of the ballast. The baffle units 41 are then spliced ​​together to form the baffle 4.

[0070] This invention provides an effective solution to the problem of uneven track bed settlement caused by ballast deformation and lateral displacement. It effectively addresses issues such as the inability of geogrid 1 to function properly when only laid on the side of the ballast, and difficulties in disassembly, maintenance, and tamping after application. The track bed reinforcement design based on three-dimensional folded geogrid 1 and shoulder ballast baffle 4 provided by this invention has a simple structure, is easy to replace, has low manufacturing cost, and a wide range of applications, enhancing the safety performance and service life of ballasted tracks.

[0071] like Figures 14 to 17 As shown, the present invention models the ballasted track bed, applies a horizontal thrust to the left to the sleepers, and performs simulation calculations for four cases: (a) without reinforcement, i.e., without geogrid 1 and baffle 4; (b) with geogrid, i.e., only geogrid 1 is set; (c) with baffle 4, i.e. only baffle 4 is set; (d) with geogrid and baffle 4, i.e., geogrid 1 and baffle 4 are set.

[0072] The calculation results of the Y1 section of the model are as follows Figure 15 and Figure 16 As shown, the DEM (Discrete Element Method) displacement represents the displacement of the ballasted track bed 3, and the FDM (Finite Element Method) displacement represents the displacement of the geogrid 1, the baffle 4, and the foundation surface 7. It can be observed that the combined application of the baffle 4 and the geogrid 1 significantly improves the lateral resistance, exhibiting the best reinforcement effect. From the force chain diagram and the displacement particle vector diagram, it can be seen that the combination of the baffle 4 and the geogrid 1 creates a stronger interlocking effect and constraint force for the ballast particles under lateral loads, effectively limiting the lateral movement and internal displacement of the particles, thereby enhancing the stiffness and stability of the overall track structure.

[0073] Specifically, this manifests as: such as Figure 16 As shown in (d), the lateral resistance of the track reaches its maximum when baffle 4 and geogrid 1 are combined. Baffle 4 provides direct physical restraint in the lateral direction, while geogrid 1 enhances the interlocking effect at the bottom of the ballast. The two work together to effectively resist lateral thrust.

[0074] like Figure 16 As shown in (c), when baffle 4 is used alone, the lateral drag effect is the second best. Although baffle 4 restricts lateral diffusion, the bottom constraint is insufficient, and the particles at the bottom of the track still have some displacement space, which reduces the potential for increasing drag.

[0075] like Figure 16 As shown in (b), when geogrid 1 is used alone, although the bottom interlocking effect is enhanced, the lack of lateral restraint allows the particles to still move under lateral load, resulting in limited improvement in lateral resistance.

[0076] like Figure 16As shown in (d), without any reinforcement measures, the lateral resistance is the lowest, and the ballast particles are prone to displacement and diffusion under external force, resulting in the worst lateral stability.

[0077] It should be noted that, Figure 15 The diagram shows the structural displacements under four different conditions where the lateral displacement of the sleepers is the same. It can be observed that... Figure 15 In (b) and (c), compared to (a), the particle displacement is larger and more particles are added. Figure 15 Compared to (b) and (c), (d) shows greater particle displacement and more particles involved, indicating that more particles participate in the lateral displacement, providing greater lateral resistance. This is mainly due to the interaction between the bottom grille, side grilles, and baffles, forming an effective "rigid-flexible" structure; Figure 17 As shown, when the lateral displacement of the sleeper is 2mm, the lateral resistance is the greatest in case (d) with grid and baffle. Therefore, a larger lateral thrust is required for case (d) with grid and baffle to make the sleeper lateral displacement 2mm. In other words, under the same lateral thrust, the lateral displacement of the sleeper is the smallest in case (d) with grid and baffle.

[0078] Therefore, the combined application of baffle 4 and geogrid 1 can maximize the lateral thrust resistance of ballasted tracks, especially when dealing with lateral train loads, effectively reducing the lateral displacement of the track structure and significantly improving the overall stability of the track. This result demonstrates that the combined design of baffle 4 and geogrid 1 has significant advantages in the lateral reinforcement of ballasted tracks.

[0079] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A three-dimensional folded geogrid combined with a ballast retaining plate reinforcement structure, characterized in that: The system includes a geogrid (1) and a baffle (4). The geogrid (1) includes a bottom grid (11) and two side grids (12). The bottom grid (11) is arranged at the bottom of the ballast track (3), and the two side grids (12) are arranged on both sides of the ballast track (3). The bottom grid (11) and the two side grids (12) are an integral structure. The baffle (4) is arranged obliquely on both sides of the ballast track (3). The baffle (4) is used to press the side grids (12) against the sides of the ballast track (3). The baffle (4) has multiple upper drainage outlets (42) arranged in the ballast section between sleepers; The bottom of the baffle (4) has a bottom drain outlet (43), which is staggered from the upper drain outlet (42) and is located in the sleeper section.

2. The three-dimensional folded geogrid and ballast retaining plate combined reinforcement structure according to claim 1, characterized in that: The upper drainage outlets (42) are arranged in multiple rows. The upper drainage outlets (42) are square and the side length of the upper drainage outlets (42) is equal to the distance between two adjacent sleepers (8).

3. The three-dimensional folded geogrid and ballast retaining plate combined reinforcement structure according to any one of claims 1 or 2, characterized in that: The baffle (4) includes multiple baffle units (41) along the length of the ballast track (3), and adjacent baffle units (41) are spliced ​​together.

4. The three-dimensional folded geogrid and ballast retaining plate combined reinforcement structure according to any one of claims 1 or 2, characterized in that: The baffle (4) is placed on the foundation surface (7), and the bottom of the baffle (4) is provided with an anti-slip bottom surface (44), which is used to enhance the anti-slip ability of the baffle (4).

5. The three-dimensional folded geogrid and ballast retaining plate combined reinforcement structure according to any one of claims 1 or 2, characterized in that: It includes multiple reinforcing limiting nails (2) arranged on the side grid (12), one end of which is inserted into the ballast track bed (3) to fix the side grid (12).

6. The three-dimensional folded geogrid and ballast retaining plate combined reinforcement structure according to claim 5, characterized in that: The reinforcing limiting nail (2) includes a nail head (21) and multiple nail bodies (22). The nail head (21) abuts against the cross intersection of the side grid (12), and the multiple nail bodies (22) are inserted into the ballast track bed (3) through the corners of the four squares around the cross intersection.

7. The three-dimensional folded geogrid and ballast retaining plate combined reinforcement structure according to claim 5, characterized in that: The reinforced limiting nail (2) is arranged in the sleeper section so that the baffle (4) presses on the reinforced limiting nail (2).

8. A construction method for a three-dimensional folded geogrid and ballast retaining wall combined reinforcement structure according to any one of claims 1 to 7, characterized in that: include: The geogrid (1) is laid flat on the foundation surface (7), and ballast is covered on it. The slope angle of the side of the ballast is 1:1.

75. Fold the two side grids (12) of the geogrid (1) upwards to the side of the ballast to ensure a tight fit to the side of the ballast; Use reinforced limiting nails (2) to nail into the cross intersection of the side grids (12) to fix the two side grids (12). The reinforced limiting nails (2) are arranged in the sleeper section. Align the upper drainage outlet (42) of the baffle unit (41) with the ballast section between the sleepers and place it on the side of the ballast. Then, splice the baffle units (41) in sequence to form the baffle (4).

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