A load-reducing structure and construction method for high-fill embankment in goaf areas

Abstract

The present invention provides a load-reducing structure and a construction method for use under a high-fill embankment in a goaf area. The load-reducing structure includes an arched base structure and multiple layers of arc-shaped geocells arranged on the outside of the arched base structure. The arched base structure includes multiple layers of compacted soil formed by filling layer by layer from bottom to top, and the width of each layer of compacted soil decreases layer by layer from bottom to top. Geocells are laid on the top surface and both side surfaces of each layer of compacted soil. A porous box culvert is arranged in the middle of the lowest layer of compacted soil. Arched fill soil is filled between two adjacent layers of arc-shaped geocells and between the innermost layer of arc-shaped geocell and the arched base structure. Backfill is performed on the outside of the outermost layer of arc-shaped geocells to form roadbed fill soil. A highway roadbed is laid on the top surface of the roadbed fill soil. Multiple layers of horizontal geocells are laid inside the roadbed fill soil near the highway roadbed.

Description

Technical Field

[0001] The present invention relates to the technical field of roadbed, pavement and underground engineering disease prevention, and in particular to a load-reducing structure used under a high-fill embankment in a goaf area and a construction method thereof. Background Art

[0002] Western China's mountainous areas have become a major battleground for highway construction. Guizhou, rich in coal resources, is nestled in the mountains. Due to topographical constraints, high-fill and deep-cut sections are unavoidable during highway construction. To meet drainage and traffic requirements, the installation of culverts in these high-fill sections is becoming increasingly common, and these culverts are buried at great depths. Furthermore, the extensive mining of coal has also created numerous coal mine goafs, which highways inevitably cross. When high-fill culverts are constructed within these goafs, the overburden is prone to uneven settlement and deformation, posing new safety risks to highway stability.

[0003] Compared with ordinary culverts, high-fill culverts in the complex environment of the goaf are subject to the dual influence of the overburden load and the complex road sections in the goaf. The stress and deformation of the culvert will be more complex, and it is prone to large-scale cracking, displacement, and sometimes collapse, which seriously affects the safety of highway use. The increase in soil pressure on high-fill culverts will greatly increase the risk of damage to the culvert body structure. However, it is far from enough to simply strengthen the culvert body structure to treat high-fill culverts in the goaf. If cracks appear in the culvert body structure, the subsequent maintenance of the culvert will be extremely difficult. In addition, the excessive height of the fill soil increases the risks faced by the goaf, not only by the vertical load of the culvert, but also by the soil pressure of the high fill.

[0004] To ensure efficient culvert construction and long-term stability, it is necessary to overcome the adverse effects of mined-out areas on culvert construction, address the safety hazards and potential damage to normal road traffic caused by deformation, settlement, and fractures caused by culvert construction in the mined-out areas, and at the same time meet the needs of high-fill embankments and river diversion. Therefore, it is necessary to implement necessary disaster prevention and disease control measures for high-fill culverts on highways in the complex environment of mined-out areas, improve the traditional high-fill embankment structure and filling methods above culverts, refine the structural design, improve construction quality, and reduce the probability of culvert damage. Reducing the load on high-fill culverts in mined-out areas is an important way to avoid excessive culvert settlement and deformation caused by excessive soil pressure. Therefore, how to reduce the load on high-fill culverts in mined-out areas is an urgent problem that needs to be solved. Summary of the Invention

[0005] The main purpose of the present invention is to propose a load-reducing structure and construction method for use under high-fill embankments in goaf areas, aiming to solve the above-mentioned technical problems.

[0006] To achieve the above-mentioned objectives, on the one hand, the present invention proposes a load-reducing structure for use under a high-fill embankment in a goaf area, comprising an arched base structure and a multi-layer arc-shaped geocell arranged on the outside of the arched base structure; the arched base structure comprises a multi-layer compacted soil formed by filling layer by layer from bottom to top, and the width of each layer of compacted soil decreases layer by layer from bottom to top; geocells are laid on the top surface and both side surfaces of each layer of compacted soil; a porous box culvert is arranged in the middle of the lowest layer of compacted soil; arched fill soil is filled between two adjacent layers of arc-shaped geocells and between the innermost layer of arc-shaped geocell and the arched base structure; filling is performed on the outside of the outermost layer of arc-shaped geocell to form a roadbed fill soil; a highway roadbed is laid on the top surface of the roadbed fill soil; and multi-layer horizontal geocells are laid inside the roadbed fill soil near the highway roadbed.

[0007] Preferably, the number of the horizontal geocells is two layers, including a first layer of horizontal geocells and a second layer of horizontal geocells spaced apart from bottom to top.

[0008] Preferably, the number of the arc-shaped geocells is two layers, including a first arc-shaped geocell and a second arc-shaped geocell spaced from the inside to the outside; backfill is performed between the first arc-shaped geocell and the arched base structure to form a first layer of arched backfill soil; backfill is performed between the first arc-shaped geocell and the second arc-shaped geocell to form a second layer of arched backfill soil.

[0009] Preferably, the structure of the geocell on each layer of compacted soil includes two sides bent downward to form a vertical bending portion for wrapping the side of the compacted soil, and a horizontal bending portion formed by bending outward at the bottom end of the vertical bending portion.

[0010] Preferably, the number of layers of the rammed soil is four, including, from bottom to top, a first layer of rammed soil, a second layer of rammed soil, a third layer of rammed soil and a fourth layer of rammed soil; a first layer of geocells is laid on the top surface and side surfaces of the first layer of rammed soil; a second layer of geocells is laid on the top surface and side surfaces of the second layer of rammed soil; a third layer of geocells is laid on the top surface and side surfaces of the third layer of rammed soil; and a fourth layer of geocells is laid on the top surface and side surfaces of the fourth layer of rammed soil.

[0011] Preferably, the top surface of the bottommost layer of compacted soil is flush with the top surface of the porous box culvert.

[0012] Preferably, all geocells are filled with fill soil.

[0013] On the other hand, the present invention also provides a construction method for the above-mentioned load-reducing structure under the high fill embankment in the goaf area, comprising the following steps:

[0014] S1. Determine the location of the porous box culvert and build it above the goaf as the base of the high fill.

[0015] S2. Construct an arched base structure at the corresponding position of the porous box culvert, and make the porous box culvert be located in the middle of the lowest layer of compacted soil of the arched base structure;

[0016] S3, filling the outer side of the arched base structure with arched fill soil and multiple layers of arc-shaped geocells in sequence;

[0017] S4, the arched base structure, the arc-shaped geocell, and the arched fill soil together form an artificial arched load-reducing structure. When the artificial arched load-reducing structure becomes stable, fill soil is gradually added from both sides of the artificial arched load-reducing structure until the filling height completely exceeds the artificial arched load-reducing structure, thereby forming a roadbed fill soil;

[0018] S5. When the top of the roadbed fill is close to the design elevation, lay multiple layers of horizontal geocells at intervals and fill the roadbed fill to the design elevation, and build the highway subgrade on the top surface of the roadbed fill.

[0019] Preferably, in step S2, when constructing the arch base structure, rammed soil is filled on the left and right sides of the porous box culvert, and the rammed soil filling height is flush with the top of the porous box culvert to form a first layer of rammed soil.

[0020] Preferably, in step S2, when constructing the arch base structure, the geocell laying method on each layer of rammed soil is: laying the geocell on the top surface of the rammed soil, bending both sides downward to form vertical bending parts to wrap the side surfaces of the rammed soil, and then bending them horizontally outward to form horizontal bending parts.

[0021] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0022] (1) Compared with other culvert embankments, the present invention designs a new load-reducing structure and construction method. The artificial arch load-reducing structure adopted solves the problems of stress concentration, water leakage, large subsidence, collapse, etc. caused by vertical loads generated by embankment filling in goaf areas and box culverts.

[0023] (2) In the present invention, an artificial arched load-reducing structure is formed by utilizing an arched base structure, an arc-shaped geocell, and an arched fill soil, so that the upper fill load is transferred to both sides of the porous box culvert through the arched load-reducing structure, thereby reducing the load of the porous box culvert by the high fill in the goaf, controlling the settlement of the porous box culvert, and also meeting the needs of highway traffic.

[0024] (3) By adopting the load-reducing structure and construction method provided by the present invention, the same filling materials as the original embankment can be used according to the principle of adapting measures to local conditions. By changing the layout mode and filling method, the load-reducing function of the artificial arch structure can be realized, thereby solving a series of problems such as large settlement displacement of the box culvert in the goaf, unreasonable embankment structure, and difficulty in filling and compaction.

[0025] (4) The present invention has the characteristics of direct method, simple facilities, convenient construction and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0027] Figure 1 A schematic cross-sectional view of a load-relief structure used under a high fill embankment in a goaf area;

[0028] Figure 2 This is an axonometric view of a load-relief structure used under a high fill embankment in a goaf area;

[0029] Figure 3 This is a top view of the load-relief structure used under the high fill embankment in the goaf area;

[0030] Figure 4 This is a schematic diagram of the geocell laying in the present invention;

[0031] Figure 5 Schematic diagram of an artificial arched load-reducing structure composed of an arched base structure, an arc-shaped geocell, and an arched fill soil in the present invention;

[0032] Figure 6 Schematic diagram of the arched base structure in the present invention.

[0033] Explanation of the figures: 1. Porous box culvert; 2. First layer of compacted soil; 3. First layer of geocell; 4. Second layer of compacted soil; 5. Second layer of geocell; 6. Third layer of compacted soil; 7. Third layer of geocell; 8. Fourth layer of compacted soil; 9. Fourth layer of geocell; 10. First layer of arched fill; 11. First arc-shaped geocell; 12. Second layer of arched fill; 13. Second arc-shaped geocell; 14. Roadbed fill; 15. First layer of horizontal geocell; 17. Second layer of horizontal geocell; 19. Highway roadbed. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] As shown in the accompanying drawings, a load-reducing structure for use under a high-fill embankment in a goaf area comprises an arched base structure and a multi-layer arcuate geocell arranged on the outside of the arched base structure; the arched base structure comprises a multi-layer compacted soil formed by filling in layer by layer from bottom to top, with the width of each layer of compacted soil decreasing layer by layer from bottom to top; geocells are laid on the top surface and both side surfaces of each layer of compacted soil; a porous box culvert 1 is provided in the middle of the bottom layer of compacted soil; arched fill soil is filled between two adjacent layers of arcuate geocells and between the innermost layer of arcuate geocell and the arched base structure; backfill is performed on the outside of the outermost layer of arcuate geocells to form a roadbed fill soil 14; a highway roadbed 19 is laid on the top surface of the roadbed fill soil 14; and a multi-layer horizontal geocell is laid inside the roadbed fill soil 14 near the highway roadbed 19.

[0038] Specifically, the horizontal geocells are two layers, including a first layer of horizontal geocells 15 and a second layer of horizontal geocells 17 spaced apart from each other from bottom to top. The arcuate geocells are two layers, including a first arcuate geocell 11 and a second arcuate geocell 13 spaced apart from each other from inside to outside. Filling is performed between the first arcuate geocell 11 and the arched base structure to form a first layer of arched fill soil 10. Filling is performed between the first arcuate geocell 11 and the second arcuate geocell 13 to form a second layer of arched fill soil 12.

[0039] Combine Figure 1 As shown, the structure of the geocell on each layer of compacted soil includes two sides bent downward to form a vertical bending portion for wrapping the side of the compacted soil, and a horizontal bending portion formed by bending outward at the bottom end of the vertical bending portion.

[0040] In this embodiment, the number of layers of rammed soil is four, including, from bottom to top, a first layer of rammed soil 2, a second layer of rammed soil 4, a third layer of rammed soil 6 and a fourth layer of rammed soil 8; a first layer of geocell 3 is laid on the top surface and side surfaces of the first layer of rammed soil 2; a second layer of geocell 5 is laid on the top surface and side surfaces of the second layer of rammed soil 4; a third layer of geocell 7 is laid on the top surface and side surfaces of the third layer of rammed soil 6; and a fourth layer of geocell 9 is laid on the top surface and side surfaces of the fourth layer of rammed soil 8.

[0041] Combine Figure 1 、 Figure 6 As shown, the top surface of the bottom layer of compacted soil is flush with the top surface of the porous box culvert 1 .

[0042] In this embodiment, all geocells are filled with fill soil.

[0043] Combine Figures 1 to 6 As shown, the construction principle of the load-reducing structure under the high fill embankment in the goaf is as follows: the porous box culvert 1 is built above the goaf, serving as a channel for the diversion of streams, springs, and river channels, and as the foundation of the load-reducing structure, it is the key to constructing an artificial arch structure. The water flow comes from the diversion of streams, rivers, etc. The position of the porous box culvert 1 is determined to ensure the passage of the diverted water flow from the river channel. The purpose of setting up the porous box culvert 1 is to prevent the water flow from eroding the embankment and seeping into the goaf, etc. It is used to divert the water flow of streams, rivers, etc. into the porous box culvert 1. Multiple layers of compacted soil are filled on the left and right sides and the top of the porous box culvert 1, and geocells are laid between the compacted soil layers to separate the compacted soil. After the filling of the compacted soil and the laying of the geocells are completed, the arched fill soil is filled on the outside of the compacted soil, and the arc-shaped geocells are laid again to construct a complete artificial arch load-reducing structure. After the artificial arch load-reducing structure is stabilized, backfill soil is placed on both sides to completely cover the structure to form a roadbed backfill soil 14. When the roadbed backfill soil 14 is completed, a highway roadbed 19 needs to be built on top of it.

[0044] Specifically, the construction method includes the following steps:

[0045] S1. Determine the location for the porous box culvert 1, and construct the porous box culvert 1 above the goaf as the base of the high fill soil.

[0046] S2. Build an arched base structure at the corresponding position of the porous box culvert 1, and make the porous box culvert 1 located in the middle of the rammed earth at the bottom layer of the arched base structure;

[0047] S3, filling the outer side of the arched base structure with arched fill soil and multiple layers of arc-shaped geocells in sequence;

[0048] S4, the arched base structure, the arc-shaped geocell, and the arched fill soil together form an artificial arched load-reducing structure. When the artificial arched load-reducing structure becomes stable, fill soil is gradually added from both sides of the artificial arched load-reducing structure until the filling height completely exceeds the artificial arched load-reducing structure, forming the roadbed fill soil 14;

[0049] S5. When the top of the roadbed fill 14 is close to the design elevation, multiple layers of horizontal geocells are laid at intervals and the roadbed 14 is filled to the design elevation, and a highway roadbed 19 is built on the top surface of the roadbed 14.

[0050] In step S2 , when constructing the arch base structure, rammed soil is filled on the left and right sides of the porous box culvert 1 , and the rammed soil filling height is flush with the top of the porous box culvert 1 , forming a first layer of rammed soil 2 .

[0051] In step S2, when constructing the arch base structure, the geocell laying method on each layer of rammed soil is as follows: the geocell is laid on the top surface of the rammed soil, and both sides are bent downward to form vertical bending parts to wrap the sides of the rammed soil, and then horizontally bent outward to form horizontal bending parts.

[0052] In this embodiment, when constructing the arch base structure, geocells are laid between the rammed soil layers to increase the stability and strength of the soil layers and reduce the bearing pressure of the soil layers. The base of the porous box culvert 1 is built above the goaf and serves as the key foundation of the artificial arch structure. The aforementioned first layer of rammed soil 2 is filled on the left and right sides of the porous box culvert 1, and the second, third, and fourth layers of rammed soil are filled layer by layer according to the designed height, and the filling width decreases layer by layer to form the main body of the load-reducing structure. The number of geocell laying layers is consistent with the number of rammed soil layers.

[0053] The first and second arched fill layers 10, 12 are constructed into an arch shape, forming the primary contours of the artificial arch. First curved geocells 11 are laid on the surface of the first arched fill layer 10, while second curved geocells 13 are laid on the surface of the second arched fill layer 12, serving as the key to reducing the load on the artificial arch.

[0054] A first layer of horizontal geocells 15 and a second layer of horizontal geocells 17 are laid in the roadbed fill 14 to enhance the load-reducing effect of the arch structure.

[0055] Furthermore, in combination with the specific structure of the load-reducing structure under the high fill embankment in the goaf area, the detailed steps of the construction method include:

[0056] Step 1: The porous box culvert 1 is located near the goaf. The position of the porous box culvert 1 is determined based on the water passage.

[0057] Step 2: The porous box culvert 1 is constructed above the goaf and serves as the base of the high fill soil.

[0058] Step 3: Fill the left and right sides of the porous box culvert 1 with the first layer of compacted soil 2 , and the filling height of the first layer of compacted soil 2 is flush with the top of the porous box culvert 1 .

[0059] Step 4: After the first layer of compacted soil 2 is filled, the first layer of geocells 3 is laid on the top and both sides of the first layer of compacted soil 2 and extended to the edge of the excavation.

[0060] Step 5: After the first layer of geocells 3 is laid, fill soil into the first layer of geocells 3 to build a preliminary artificial arch structure.

[0061] Step 6: After the first layer of geocells 3 is filled, the second layer of compacted soil 4 is filled on top of the first layer of geocells 3. The filling height is the same as that of the first layer of compacted soil 2, but the filling width is shortened.

[0062] Step 7: After the second layer of compacted soil 4 is filled, the second layer of geocells 5 is laid on the top and both sides of the second layer of compacted soil 4 and extended to the top edge of the first layer of geocells 3 .

[0063] Step 8: After the second layer of geocells 5 is laid, fill the second layer of geocells 5 with backfill soil.

[0064] Step 9: After the second layer of geocells 5 is filled, the third layer of compacted soil 6 is filled on top of the second layer of geocells 5. The filling height is the same as that of the second layer of compacted soil 4, but the filling width is shortened.

[0065] Step 10: After the third layer of compacted soil 6 is filled, the third layer of geocells 7 is laid on top of and on both sides of the third layer of compacted soil 6 and extended to the top edge of the second layer of geocells 5 .

[0066] Step 11: After the third layer of geocells 7 is laid, fill the third layer of geocells 7 with backfill soil.

[0067] Step 12: After the third layer of geocells 7 is filled, a fourth layer of compacted soil 8 is filled on top of the third layer of geocells 7. The filling height is the same as that of the third layer of compacted soil 6, but the filling width is shortened.

[0068] Step 13: After the fourth layer of compacted soil 8 is filled, the fourth layer of geocells 9 is laid on top of and on both sides of the fourth layer of compacted soil 8 and extended to the top edge of the third layer of geocells 7 .

[0069] Step 14: After the fourth layer of geocells 9 is laid, fill the fourth layer of geocells 9 with backfill soil to complete the construction of the arched base structure.

[0070] Step 15: Fill the outer side of the arched base structure with a first layer of arched fill soil 10.

[0071] Step 16: The first arc-shaped geocell 11 is laid on the surface of the first layer of arched fill soil 10 to form a preliminary load-relieving arched structure.

[0072] Step 17: After the first arc-shaped geocell 11 is filled with backfill soil, a second layer of arch-shaped backfill soil 12 is filled outside the first arc-shaped geocell 11 to form a two-layer arch.

[0073] Step 18: After the second layer of arched fill 12 is completed, a second arc-shaped geocell 13 is laid on the outside of the second layer of arched fill 12 to form a second layer of load-reducing structure. At this point, the arched base structure, the arc-shaped geocell, and the arched fill together constitute an artificial arched load-reducing structure.

[0074] Step 19: After the construction of the artificial arch load-reducing structure is completed, the roadbed fill soil 14 is filled layer by layer on both sides of the artificial arch load-reducing structure according to the height of the arch single-layer structure.

[0075] Step 20: The roadbed fill 14 is filled to completely cover the arch structure. After the fill is stable and the top of the roadbed fill 14 is close to the design elevation, the first layer of horizontal geocells 15 and the second layer of horizontal geocells 16 are further laid to reduce the vertical load of the roadbed on the fill.

[0076] Step 21: Fill the roadbed fill soil 14 to the design elevation, and build the highway roadbed 19 on the top surface of the roadbed fill soil 14.

[0077] Note: The concrete strength of porous box culvert 1 must meet the standards, and the strength of compacted soil must meet the specifications.

[0078] In this embodiment, streams, rivers, and other water flows are diverted to the porous box culvert 1 to prevent water from seeping into the embankment and crossing the goaf, causing the roadbed and goaf to collapse. The porous box culvert 1 also serves as the base, forming the foundation of an artificial arched load-reducing structure. This fills the gap in load-reducing methods and conforms to the principles of adapting to local conditions and green energy conservation. This not only changes the water flow channel to ensure smooth water flow, but also reduces the fill load on the goaf and the upper part of the box culvert, greatly saving manpower, material, and financial resources. The diversion location of streams, rivers, and other sources is determined, ensuring the rationality of the position of the porous box culvert 1, and directing the water flow into the porous box culvert 1. The compacted soil layer significantly increases its strength because most of the cracks in the soil are squeezed and compacted. The compacted soil is combined with the porous box culvert 1 to form an arched base structure. Geocells, a honeycomb-shaped three-dimensional confinement system, combined with fill soil, form a structure with strong lateral restraint and high stiffness. The arched base structure, curved geocells, and arched fill soil together form an artificial arched load-reducing structure. The upper fill load is transferred to both sides of the porous box culvert 1 through the arched load-reducing structure, reducing the vertical load acting on the porous box culvert 1 and the goaf, alleviating stress concentration and preventing defects such as large and uneven deformation, cracking, and water leakage in the box culvert. Fill soil is placed on both sides and above the artificial arched load-reducing structure to form the roadbed fill soil 14. This is done to maintain the integrity between the embankment and the original ground, meet the construction requirements of the highway subgrade, and ensure safe passage of vehicles on the completed highway.

[0079] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A load-reducing structure for use under a high-fill embankment in a goaf, characterized in that: It includes an arched base structure and multi-layered arc-shaped geocells arranged outside the arched base structure; The arched base structure comprises multiple layers of compacted soil formed by filling in layers from bottom to top, with the width of each layer of compacted soil decreasing layer by layer from bottom to top; geocells are laid on the top surface and both sides of each layer of compacted soil; and a porous box culvert (1) is provided in the middle of the bottom layer of compacted soil; Arched fill soil is filled between two adjacent layers of arcuate geocells and between the innermost layer of arcuate geocells and the arched base structure; the outer side of the outermost layer of arcuate geocells is filled to form a roadbed fill soil (14); a highway roadbed (19) is laid on the top surface of the roadbed fill soil (14); and multiple layers of horizontal geocells are laid inside the roadbed fill soil (14) near the highway roadbed (19).

2. A load-reducing structure for use under a high-fill embankment in a goaf area according to claim 1, characterized in that: The number of the horizontal geocells is two layers, including a first layer of horizontal geocells (15) and a second layer of horizontal geocells (17) spaced apart from each other from bottom to top.

3. The load-reducing structure for use under a high-fill embankment in a goaf according to claim 1, characterized in that: The number of the arc-shaped geocells is two layers, including a first arc-shaped geocell (11) and a second arc-shaped geocell (13) spaced from the inside to the outside; filling is performed between the first arc-shaped geocell (11) and the arched base structure to form a first layer of arched fill soil (10); and filling is performed between the first arc-shaped geocell (11) and the second arc-shaped geocell (13) to form a second layer of arched fill soil (12).

4. The load-reducing structure for use under a high-fill embankment in a goaf according to claim 1, characterized in that: The structure of the geocell on each layer of compacted soil includes two sides bent downward to form a vertical bending portion for wrapping the side of the compacted soil, and a horizontal bending portion formed by bending outward at the bottom end of the vertical bending portion.

5. The load-reducing structure for use under a high-fill embankment in a goaf according to claim 1, characterized in that: The number of layers of the rammed soil is four, which include, from bottom to top, a first layer of rammed soil (2), a second layer of rammed soil (4), a third layer of rammed soil (6), and a fourth layer of rammed soil (8); A first layer of geocells (3) is laid on the top and side surfaces of the first layer of compacted soil (2); A second layer of geocells (5) is laid on the top and side surfaces of the second layer of compacted soil (4); A third layer of geocells (7) is laid on the top and side surfaces of the third layer of compacted soil (6); A fourth layer of geocells (9) is laid on the top surface and side surfaces of the fourth layer of compacted soil (8).

6. The load-reducing structure for use under a high-fill embankment in a goaf according to claim 1, characterized in that: The top surface of the bottommost layer of compacted soil is flush with the top surface of the porous box culvert (1).

7. The load-reducing structure for use under a high-fill embankment in a goaf as claimed in claim 1, characterized in that: All geocells are filled with fill soil.

8. A construction method for a load-reducing structure under a high-fill embankment in a goaf according to any one of claims 1 to 7, characterized in that: The steps include: S1. Determine the construction location of the porous box culvert (1), and construct the porous box culvert (1) above the goaf and serve as the base of the high fill soil; S2. constructing an arched base structure at a position corresponding to the porous box culvert (1), and making the porous box culvert (1) located in the middle of the rammed earth layer at the bottom of the arched base structure; S3, filling the outer side of the arched base structure with arched fill soil and multiple layers of arc-shaped geocells in sequence; S4, the arched base structure, the arc-shaped geocell, and the arched fill soil together constitute an artificial arched load-reducing structure. When the artificial arched load-reducing structure becomes stable, fill soil is gradually added from both sides of the artificial arched load-reducing structure until the filling height completely exceeds the artificial arched load-reducing structure, thereby forming a roadbed fill soil (14); S5. When the top of the roadbed fill soil (14) is close to the design elevation, multiple layers of horizontal geocells are laid at intervals and the roadbed fill soil (14) is filled to the design elevation, and a highway roadbed (19) is built on the top surface of the roadbed fill soil (14).

9. The construction method for a load-reducing structure under a high-fill embankment in a goaf area according to claim 8, characterized in that: In step S2, when constructing the arch base structure, rammed earth is filled on the left and right sides of the porous box culvert (1), and the rammed earth filling height is flush with the top of the porous box culvert (1), forming a first layer of rammed earth (2).

10. The construction method for a load-reducing structure under a high-fill embankment in a goaf area according to claim 8, characterized in that: In step S2, when constructing the arch base structure, the geocell laying method on each layer of rammed soil is as follows: the geocell is laid on the top surface of the rammed soil, and both sides are bent downward to form vertical bending parts to wrap the sides of the rammed soil, and then horizontally bent outward to form horizontal bending parts.

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