Flexible fill retaining wall structure and method of rapid construction thereof

Abstract

The application provides a flexible filling retaining wall structure and a quick construction method thereof, which comprises reinforcing components, metal nets and water-permeable synthetic cloth arranged in sequence; the reinforcing components comprise a plurality of anchor rods arranged along the periphery of a roadway and steel wires hung on the anchor rods; the anchor rods are at a certain angle with the wall surface of the roadway along the filling direction; one end of the anchor rod close to the filling area is exposed in the filling area; the other end of the anchor rod is anchored in the rock wall of the roadway; the steel wires are continuously hung on the exposed end of the anchor rod to form a net structure; the application simplifies the construction structure of the filling retaining wall by arranging the reinforcing components and designing the layout and structure of the reinforcing components, so that the impact force received during the filling can be converted into the supporting force for maintaining the balance of the filling retaining wall and the surrounding rock, the supporting force of the filling retaining wall is improved; the flexible filling retaining wall structure is simple, the construction process is easy to implement, the construction time is short, the supporting capacity of the flexible filling retaining wall is better than that of the prior art, and the flexible filling retaining wall is suitable for being popularized and applied in the mining industry.

Description

Technical Field

[0001] This invention relates to the field of mining technology, and in particular to a flexible filling retaining wall structure and its rapid construction method. Background Technology

[0002] In underground mining both domestically and internationally, due to advancements in mining technology, processes, and equipment, as well as the promotion of relevant national policies and regulations, backfill mining has become a development trend and is being applied more and more widely in mines. In mines using the backfill method, the construction methods and processes of the backfill retaining walls have a significant impact on the application of the mining method, and the construction of the backfill retaining walls is also a crucial aspect of stope construction operations in backfill mining.

[0003] Traditional forms of infill retaining walls include wooden retaining walls, brick retaining walls, and concrete retaining walls. For example, an invention patent (application number CN 202211197101.3) discloses a shotcrete infill retaining wall and its construction process. This infill retaining wall includes a shotcrete layer and a skeleton layer, with an anti-seepage layer between the shotcrete layer and the skeleton layer. The shotcrete layer includes shotcrete and reinforced anchor bolts, with a portion of the reinforced anchor bolts encased inside the shotcrete. The skeleton layer includes a framework composed of crisscrossing steel pipes and a steel mesh set on the framework. This shotcrete infill retaining wall suffers from complex construction processes, long construction times, and high costs; moreover, its supporting capacity is limited, and local cracks may occur in the retaining wall due to pressure concentration during filling. While wooden and brick retaining walls have low construction costs, their supporting capacity is weak, resulting in poor performance.

[0004] In recent years, flexible retaining wall construction technology has made significant progress. Due to its low construction cost, high strength, and the fact that most retaining wall construction materials can be reused, it has gained industry recognition and been applied in mines. (Utility model patent application number: CN) Patent 201720434830.4 discloses a lightweight filling retaining wall for mining, comprising a steel frame, reinforcing mesh, wooden boards, burlap sacks, geotextile, pre-reserved manholes, filter pipes, a roadway floor slab, inclined supports for the roof slab, wooden manhole baffles, and a roadway roof slab. The reinforcing mesh is tied to the steel frame, the wooden boards are fixed to the reinforcing mesh, and the burlap sacks and geotextile are sequentially fixed to the wooden boards. The steel frame is fixed inside the roadway to form the wall. Inclined supports for the roof slab are provided between the wall and the roadway floor slab, and inclined supports for the roof slab are provided between the wall and the roadway roof slab. Filter pipes and pre-reserved manholes are provided on the wall, with one end of the filter pipe located inside the wall and the other end located outside the wall. Wooden manhole baffles are provided on the pre-reserved manholes. The method of reinforcing the retaining wall by relying on inclined supports makes it difficult to adapt to continuous multiple fillings, and the construction structure is relatively complex. The installation and dismantling of the construction materials are time-consuming, which brings certain difficulties to the promotion and application of flexible retaining wall structures.

[0005] In view of this, it is necessary to design an improved flexible infill retaining wall structure and its rapid construction method to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a flexible filling retaining wall structure and its rapid construction method. By setting reinforcement components in the flexible filling retaining wall structure and designing the layout and structure of the reinforcement components, the construction structure of the filling retaining wall is simplified, so that the impact force received during filling can be transformed into a supporting force to maintain the balance between the filling retaining wall and the surrounding rock, thereby improving the supporting force of the flexible filling retaining wall structure and expanding the promotion and application of flexible filling retaining walls.

[0007] To achieve the above-mentioned objectives, this invention provides a flexible filling retaining wall structure, comprising a reinforcing component, a metal mesh, and a permeable synthetic fabric arranged in sequence, wherein the permeable synthetic fabric is arranged on one side near the filling area; the reinforcing component includes a plurality of anchor rods arranged around the perimeter of the tunnel and steel wire ropes suspended on the anchor rods, wherein the anchor rods form an angle of 30° to 60° with the tunnel wall along the filling direction, one end of the anchor rod near the filling area is exposed within the filling area, and the other end is anchored within the rock wall of the tunnel, and the steel wire ropes are continuously suspended from the exposed end of the anchor rods, forming a mesh structure.

[0008] As a further improvement of the present invention, the anchor bolt includes a side anchor bolt, a top anchor bolt, and a bottom anchor bolt. The side anchor bolt is divided into upper anchor bolts and lower anchor bolts from the center height of the roadway, and the spacing between the upper anchor bolts is greater than the spacing between the lower anchor bolts.

[0009] As a further improvement of the present invention, the distance between the lowest anchor bolt in the lower anchor bolt and the bottom plate of the roadway is 0.1 to 0.2 m, and the spacing of the lower anchor bolts gradually increases from bottom to top; the spacing of the upper anchor bolts is the same, which is 0.5 to 0.6 m.

[0010] As a further improvement of the present invention, the wire rope is sequentially connected to any two anchor rods at the same height or at the same horizontal position, forming a mesh structure in which the wire ropes are perpendicular to each other at the location of the flexible filling retaining wall construction.

[0011] As a further improvement of the present invention, a buckle and an anchor rod tray are provided at the suspension point where the wire rope contacts the anchor rod. The buckle and the anchor rod tray are used to secure the connection structure between the wire rope and the anchor rod.

[0012] As a further improvement of the present invention, a binding assembly is provided between the metal mesh and the wire rope of the mesh structure to fix the two together; the permeable synthetic fabric is provided with a fixing member to the wall of the tunnel, and a cement reinforcement layer is also provided to prevent grout leakage during the filling process.

[0013] As a further improvement of the present invention, the distance between the top anchor and the bottom anchor is 0.4 to 0.5 m, and the length of the anchor exposed in the filling area is 0.2 to 0.3 m.

[0014] As a further improvement of the present invention, the middle area of ​​the flexible filling retaining wall structure is also provided with a drain outlet, the drain outlet is connected to a drain pipe, and the drain pipe is connected to the top plate of the filling area; the drain pipe is a one-way permeable pipe.

[0015] As a further improvement of the present invention, the length of the anchor rod is 2.0 to 2.5 m and the diameter is 24 to 30 mm; the wire rope is a hot-dip galvanized wire rope with a diameter of 24 to 30 mm, and the mesh size of the metal mesh is 10 mm * 10 mm.

[0016] As a further improvement of the present invention, the diameter of the drain outlet is 46-54 mm, and the number of drain outlets is 1-6.

[0017] The present invention also provides a rapid construction method for the flexible infill retaining wall structure described in any one of the above-mentioned methods, comprising the following steps:

[0018] S1. Drill inclined holes around the roadway surface at the location where the filling retaining wall is to be constructed. The holes are at an angle of 30° to 60° with the roadway wall along the filling direction. Install anchor bolts in the holes, exposing the outer ends of the anchor bolts in the filling area. After installation, anchor bolts are anchored with anchoring agent.

[0019] S2. Use steel wire ropes to continuously connect any two anchors at the same height or the same horizontal position to form a mesh structure in which the steel wire ropes are perpendicular to each other at the location of the filling retaining wall construction. After the steel wire ropes are wrapped around the exposed part of the anchors, they are straightened and tightened with buckles. Then, the connection structure between the anchors and the steel wire ropes is fixed with anchor trays.

[0020] S3. On the side of the wire rope mesh structure formed in step S2 that is close to the filling area, a metal mesh and a permeable synthetic fabric are sequentially installed. The metal mesh and the wire rope are fixed together using a binding assembly. The permeable synthetic fabric is fixed to the wall of the tunnel using a fastener. A cement reinforcement layer is then laid to complete the rapid construction of the flexible filling retaining wall structure.

[0021] As a further improvement of the present invention, the boreholes are divided into side boreholes, top boreholes and bottom boreholes according to their positions. The side boreholes are divided into upper boreholes and lower boreholes from the center height of the roadway. The spacing between the upper boreholes is greater than the spacing between the lower boreholes, and the spacing between the lower boreholes gradually increases from bottom to top.

[0022] The beneficial effects of this invention are:

[0023] 1. In the flexible filling retaining wall structure and its rapid construction method of the present invention, the flexible filling retaining wall structure includes reinforcing components, a metal mesh, and a permeable synthetic fabric arranged in sequence. The reinforcing components include several anchor rods arranged around the perimeter of the tunnel and steel wire ropes suspended on the anchor rods. The anchor rods and the tunnel wall form an angle of 30° to 60° along the filling direction. One end of the anchor rod near the filling area is exposed within the filling area, and the other end is anchored within the rock wall of the tunnel. The steel wire ropes are continuously suspended from the exposed end of the anchor rods, forming a mesh structure. The present invention simplifies the construction structure of the filling retaining wall by setting reinforcing components in the flexible filling retaining wall structure and designing the layout and structure of the reinforcing components. This allows the impact force received during filling to be converted into a supporting force that maintains the balance between the filling retaining wall and the surrounding rock, thereby improving the supporting force of the flexible filling retaining wall structure and broadening the promotion and application of flexible filling retaining walls.

[0024] 2. This invention sets the anchor bolt at a certain angle to the roadway wall, exposing one end of the anchor bolt near the filling area while anchoring the other end into the roadway rock wall. During filling, the impact force of the filling grout on the exposed anchor bolt end is transmitted through the anchor bolt, increasing the relative force between the anchor bolt and the surrounding rock. The entire anchored section of the anchor bolt is subjected to the reaction force provided by the surrounding rock. All anchor bolts in the entire reinforcement assembly form a pressure-bearing structure through the superposition of forces. This provides better stability than the current method of constructing anchor bolts perpendicular to the rock wall, which is commonly used in most flexible retaining wall constructions. The anchor bolts are less prone to bending under stress, preventing stress imbalance in the filling retaining wall caused by the lateral pressure of the filling grout. This improves the supporting performance of the filling retaining wall. The present invention also sets the lower spacing of the side anchors to be smaller than the upper spacing of the anchors, which provides greater support to the bottom of the retaining wall and avoids the problem of local cracks or deformation of the retaining wall that may be caused by the continuous impact of the filling slurry on the lower filling retaining wall during continuous filling. This improves the support capacity and blocking effect of the flexible filling retaining wall.

[0025] 3. This invention optimizes the construction form and structure of flexible filling retaining walls. The flexible filling retaining wall abandons the multi-layered and complex structure of traditional flexible filling retaining walls. The construction structure is simple, the construction process is easy to implement, the materials are easy to install, the construction time is short, and it has a better support capacity than existing flexible filling retaining walls. It is suitable for widespread application in the mining industry. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the flexible filling retaining wall structure of the present invention.

[0027] Figure 2 This is a top view of the flexible filling retaining wall structure of the present invention in a tunnel.

[0028] Figure 3This is a front view of the flexible filling retaining wall structure of the present invention in a roadway.

[0029] Figure 4 This is a schematic diagram of the combined arrangement of anchor bolts and wire ropes in the flexible filling retaining wall structure of the present invention.

[0030] Figure 5 This is a schematic diagram of the buckle and limiting end in the flexible filling retaining wall structure of the present invention.

[0031] Figure 6 This is a front view of the snap-fit ​​structure in the flexible filling retaining wall structure of the present invention.

[0032] Figure Labels

[0033] 100-Flexible filling retaining wall structure; 110-Reinforcement component; 111-Anchor bolt; 112-Steel wire rope; 120-Metal mesh; 130-Permeable synthetic fabric; 140-Snap fastener; 141-Limiting end; 142-Nut; 150-Anchor bolt tray; 160-Fixing component; 170-Cement reinforcement layer; 180-Drain outlet; 200-Drain pipe. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0036] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Example 1

[0038] Please see Figures 1-2As shown, a flexible filling retaining wall structure 100 includes a reinforcing component 110, a metal mesh 120, and a permeable synthetic fabric 130 arranged in sequence. The permeable synthetic fabric 130 is located on the side close to the filling area. The reinforcing component 110 includes several anchor rods 111 arranged around the tunnel and steel wire ropes 112 hanging on the anchor rods 111. The anchor rods 111 form an angle of 30° to 60° with the tunnel wall along the filling direction. One end of the anchor rod 111 near the filling area is exposed in the filling area, and the other end is anchored in the rock wall of the tunnel. The steel wire ropes 112 are continuously hung on the exposed end of the anchor rod 111 to form a mesh structure.

[0039] Specifically, by setting the anchor bolt 111 at a certain angle to the roadway wall, and exposing one end of the anchor bolt 111 near the filling area while anchoring the other end into the roadway rock wall, the impact force of the filling grout on the exposed anchor bolt end during the filling process is transmitted through the anchor bolt 111, thereby increasing the relative force between the anchor bolt 111 and the surrounding rock. The entire anchored section of the anchor bolt 111 within the surrounding rock is subjected to the reaction force provided by the surrounding rock. All the anchor bolts 111 in the entire reinforcement component 110 form a pressure-bearing structure through the superposition of forces, resulting in extremely strong pressure-bearing capacity. This method is more stable than the current method of constructing anchor bolts perpendicular to the rock wall, which is commonly used in the construction of most flexible retaining walls. The anchor bolt 111 is less prone to bending under stress, avoiding the problem of stress imbalance in the filling retaining wall caused by the lateral pressure of the filling grout acting on the filling retaining wall, which could potentially damage the flexible filling retaining wall. This improves the supporting performance of the filling retaining wall.

[0040] Preferably, in this embodiment, the anchor bolt 111 forms a 45° angle with the wall of the tunnel along the filling direction, and the length of the anchor bolt exposed in the filling area is 0.25m, so that the anchor bolts 111 distributed around the tunnel form a structure with good pressure bearing effect.

[0041] Please see Figure 4As shown, anchor bolts 111 include side anchor bolts, top anchor bolts, and bottom anchor bolts. The side anchor bolts are divided into upper and lower anchor bolts at the center height of the roadway, with the spacing between the upper anchor bolts being greater than that between the lower anchor bolts. This arrangement provides greater support to the bottom of the retaining wall, preventing local cracks or deformation that might occur during continuous filling due to the constant impact of the filling slurry on the lower retaining wall. This improves the support capacity and blocking effect of the flexible filling retaining wall. It should be noted that the side anchor bolts here refer to the anchor bolts 111 arranged on the left and right sides of the tunnel, which are inclined towards the surrounding rock on the left and right sides and form a certain angle with the tunnel wall along the filling direction; the top anchor bolts refer to the anchor bolts 111 arranged on the roof of the tunnel, which are inclined upward and embedded into the surrounding rock and form a certain angle with the tunnel wall along the filling direction; the bottom anchor bolts refer to the anchor bolts 111 set on the floor of the tunnel, which are inclined downward and embedded into the surrounding rock and form a certain angle with the tunnel wall along the filling direction.

[0042] Specifically, the distance between the bottommost anchor bolt and the roadway floor is 0.1 to 0.2 m, and the spacing of the lower anchor bolts gradually increases from bottom to top; the spacing of the upper anchor bolts is the same, 0.5 to 0.6 m; the spacing between the top and bottom anchor bolts is 0.4 to 0.5 m.

[0043] In this embodiment, the distance between the lowest anchor bolt and the bottom plate of the roadway is 0.2m. The spacing of the lower anchor bolts gradually increases from bottom to top within the range of 0.2 to 0.5m. The spacing of the upper anchor bolts is 0.5m, and the spacing between the top anchor bolt and the bottom anchor bolt is 0.45m.

[0044] The steel wire ropes 112 are sequentially connected to any two anchor rods 111 at the same height or horizontal position, forming a mesh structure in which the steel wire ropes 112 are perpendicular to each other at the location where the flexible filling retaining wall is constructed; the specific structure is as follows. Figure 4 As shown, all connections of the anchor bolts 111 can be completed using only one continuous steel wire rope 112, thus forming a stable mesh structure and improving the support capacity of the filling retaining wall.

[0045] Please see Figures 5-6 As shown, a buckle 140 and an anchor rod tray 150 are provided at the suspension point where the wire rope 112 contacts the anchor rod 111. The buckle 140 and anchor rod tray 150 are used to secure the connection structure between the wire rope 112 and the anchor rod 111. The buckle 140 is provided with a limiting end 141 and a nut 142 to ensure that the anchoring structure 111 is stably anchored in the rock mass. A binding assembly is provided between the metal mesh 120 and the mesh-structured wire rope 112 to fix the two together; the permeable synthetic fabric 130 is fixed to the tunnel wall with a fastener 160, and a cement reinforcement layer 170 is also provided to prevent grout leakage during the filling process.

[0046] Specifically, the flexible infill retaining wall structure also includes a drainage outlet 180 in the middle area, which connects to a drainage pipe 200, which in turn connects to the top slab of the infill area. The drainage pipe 200 is a one-way permeable pipe. The diameter of the drainage outlet 180 is 46–54 mm, and the number of drainage outlets 180 is 1–6. The anchor bolts 111 are 2.0–2.5 m long and 24–30 mm in diameter; the steel wire rope 112 is a hot-dip galvanized steel wire rope with a diameter of 24–30 mm; the metal mesh 120 has a mesh size of 10 mm * 10 mm; and the permeable synthetic fabric 130 is geotextile.

[0047] Example 2

[0048] A rapid construction method for a flexible infill retaining wall structure 100 includes the following steps:

[0049] S1. Drill inclined holes around the roadway surface at the location where the filling retaining wall is to be constructed. The holes are at a 45° angle to the roadway wall along the filling direction. Install anchor rods 111 in the holes, exposing the outer end of the anchor rods 111 in the filling area. After installation, anchor rods 111 are anchored with anchoring agent. The strength of the anchoring agent is not less than 30MPa.

[0050] S2. Use steel wire ropes 112 to continuously connect any two anchor rods 111 at the same height or the same horizontal position, forming a mesh structure of steel wire ropes 112 perpendicular to each other at the location of the filling retaining wall construction. After the steel wire ropes 112 are wrapped around the exposed part of the anchor rods 111, they are straightened and tightened with buckles 140. Then, anchor rod trays 150 are used to fix the connection structure between the anchor rods 111 and the steel wire ropes 112.

[0051] S3. On the side of the wire rope 112 mesh structure formed in step S2 near the filling area, a metal mesh 120 and a permeable synthetic fabric 130 are sequentially installed. The metal mesh 120 and the wire rope 112 are fixed together using a binding assembly. The permeable synthetic fabric 130 is fixed to the roadway wall using a fastener 160. A cement reinforcement layer 170 is then laid to complete the rapid construction of the flexible filling retaining wall structure 100.

[0052] Specifically, in step S1, the boreholes are divided into side boreholes, top boreholes and bottom boreholes according to their location. The side boreholes are divided into upper boreholes and lower boreholes from the center height of the roadway. The spacing between the upper boreholes is greater than the spacing between the lower boreholes, and the spacing between the lower boreholes gradually increases from bottom to top.

[0053] In this embodiment, the diameter of the drill hole is φ42mm, the length of the anchor rod 111 is 2.2m and the diameter is 28mm; the wire rope 112 is a hot-dip galvanized steel wire rope with a diameter of 26mm, and the mesh size of the metal mesh is 10mm*10mm.

[0054] Examples 1 and 2 optimize the construction form and structure of the flexible filling retaining wall, so that the flexible filling retaining wall abandons the multi-layer complex structure of the traditional flexible filling retaining wall, the construction structure is simple, the construction process is easy to implement, the materials are convenient to install, the time is short, and it has a better support capacity than the existing flexible filling retaining wall, making it suitable for widespread application in the mining industry.

[0055] In summary, this invention provides a flexible filling retaining wall structure and its rapid construction method. The flexible filling retaining wall structure includes a reinforcing component, a metal mesh, and a permeable synthetic fabric arranged in sequence. The reinforcing component includes several anchor rods arranged around the tunnel and steel wire ropes hanging on the anchor rods. The anchor rods and the tunnel wall form an angle of 30° to 60° along the filling direction. One end of the anchor rod near the filling area is exposed in the filling area, and the other end is anchored in the rock wall of the tunnel. The steel wire ropes are continuously hung on the exposed end of the anchor rods, forming a mesh structure. This invention simplifies the construction of a flexible infill retaining wall by incorporating reinforcing components and designing their layout and structure. This allows the retaining wall to convert the impact force received during filling into a supporting force that maintains the balance between the retaining wall and the surrounding rock, thus enhancing the structural support of the flexible infill retaining wall. During the filling process, the impact force generated by the filling grout on the exposed anchor bolt ends is transmitted through the anchor bolts, increasing the relative force between the anchor bolts and the surrounding rock. The entire anchorage section of the anchor bolt within the surrounding rock experiences a reaction force from the rock, thus strengthening the entire reinforcement. All the anchors in the component form a pressure-bearing structure through the superposition of forces, resulting in extremely strong pressure-bearing capacity. Compared with the current method of using anchors perpendicular to the rock face in the construction of most flexible retaining walls, it is more stable, and the anchors are less prone to bending under stress. This avoids the stress imbalance of the filling retaining wall caused by the lateral pressure of the filling slurry in the filling area, thereby improving the support performance of the filling retaining wall. Moreover, the construction structure of the flexible filling retaining wall is simple, the construction process is easy to implement, the materials are convenient to install, and the construction time is short. It also has a superior support capacity compared with existing flexible filling retaining walls, making it suitable for widespread application in the mining industry.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A flexible infill retaining wall structure, characterized in that, It includes a reinforcement component, a metal mesh, and a permeable synthetic fabric that are sequentially contacted and arranged, with the permeable synthetic fabric arranged on one side near the filling area; The reinforcement assembly includes several anchor rods arranged around the perimeter of the tunnel and steel wire ropes suspended on the anchor rods. The anchor rods form an angle of 30° to 60° with the tunnel wall along the filling direction. One end of the anchor rod near the filling area is exposed in the filling area, and the other end is anchored in the rock wall of the tunnel. The steel wire ropes are continuously suspended from the exposed end of the anchor rods, forming a mesh structure. The anchor bolts include side anchor bolts, top anchor bolts, and bottom anchor bolts. The side anchor bolts are divided into upper and lower anchor bolts at the center height of the roadway. The spacing between the upper anchor bolts is greater than the spacing between the lower anchor bolts. The distance between the bottommost anchor bolt and the floor of the roadway is 0.1 to 0.2 meters, and the spacing between the lower anchor bolts gradually increases from bottom to top. The spacing between the upper anchor bolts is the same, ranging from 0.5 to 0.6 meters. The steel wire rope is sequentially connected to any two anchor rods at the same height or horizontal position, forming a mesh structure in which the steel wire ropes are perpendicular to each other at the location of the flexible filling retaining wall construction; the suspension point where the steel wire rope contacts the anchor rod is provided with a buckle and an anchor rod tray, which are used to secure the connection structure between the steel wire rope and the anchor rod.

2. The flexible filling retaining wall structure according to claim 1, characterized in that, A binding assembly is provided between the metal mesh and the steel wire rope of the mesh structure to fix the two together; the permeable synthetic fabric is fixed to the wall of the tunnel and is also provided with a cement reinforcement layer to prevent grout leakage during the filling process.

3. The flexible filling retaining wall structure according to claim 1, characterized in that, The distance between the top anchor and the bottom anchor is 0.4 to 0.5 m, and the length of the anchor exposed in the filling area is 0.2 to 0.3 m.

4. The flexible filling retaining wall structure according to claim 1, characterized in that, The flexible filling retaining wall structure is also provided with a drainage outlet in the middle area. The drainage outlet is connected to a drainage pipe, which is connected to the top plate of the filling area. The drainage pipe is a one-way permeable pipe.

5. A rapid construction method for a flexible infill retaining wall structure according to any one of claims 1 to 4, characterized in that, Includes the following steps: S1. Drill inclined holes around the roadway surface at the location where the filling retaining wall is to be constructed. The holes are at an angle of 30° to 60° with the roadway wall along the filling direction. Install anchor bolts in the holes, exposing the outer ends of the anchor bolts in the filling area. After installation, anchor bolts are anchored with anchoring agent. S2. Use steel wire ropes to continuously connect any two anchors at the same height or the same horizontal position to form a mesh structure in which the steel wire ropes are perpendicular to each other at the location of the filling retaining wall construction. After the steel wire ropes are wrapped around the exposed part of the anchors, they are straightened and tightened with buckles. Then, the connection structure between the anchors and the steel wire ropes is fixed with anchor trays. S3. On the side of the wire rope mesh structure formed in step S2 that is close to the filling area, a metal mesh and a permeable synthetic fabric are sequentially installed. The metal mesh and the wire rope are fixed together using a binding assembly. The permeable synthetic fabric is fixed to the wall of the tunnel using a fastener. A cement reinforcement layer is then laid to complete the rapid construction of the flexible filling retaining wall structure.

6. The rapid construction method for the flexible infill retaining wall structure according to claim 5, characterized in that, The boreholes are classified into side boreholes, top boreholes, and bottom boreholes according to their location. The side boreholes are divided into upper boreholes and lower boreholes from the center height of the roadway. The spacing between the upper boreholes is greater than the spacing between the lower boreholes, and the spacing between the lower boreholes gradually increases from bottom to top.

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