A composite roadbed structure for a shallow sea reclamation area

Abstract

This invention discloses a composite roadbed structure for shallow marine reclamation areas, relating to the field of land reclamation construction technology, aiming to solve the technical challenges of uneven settlement and reflective cracking in soft soil foundations in these areas. The structure provides rigid support through a pile foundation system embedded in the soft mud layer and innovatively employs support components with elastic restoring functions. Combined with a double-layer geogrid reinforcement and isolation system and a layered transition reinforcement layer, it forms a synergistic load-bearing system that combines rigidity and flexibility. This system effectively disperses loads, absorbs and reduces stress caused by differential settlement, and automatically adjusts its restoring function, thereby significantly suppressing the generation of reflective cracks in the pavement. This invention possesses excellent stability, adaptability, and durability, making it particularly suitable for rapid and efficient road infrastructure construction in shallow marine reclamation areas.

Description

Technical Field

[0001] This invention relates to the field of land reclamation construction technology, and more specifically to a composite roadbed structure for shallow sea reclamation areas. Background Technology

[0002] Shallow-sea reclamation is a process of transforming shallow sea areas into land through artificial means. This method typically involves using large reclamation equipment (such as cutter suction dredgers and grab dredgers) to pump materials such as silt and soil from the seabed into designated areas, forming new land. Shallow-sea reclamation is widely used in coastal land development and infrastructure construction, such as urban expansion, port construction, airport construction, and industrial zone development. In shallow-sea reclamation areas, the newly formed land often has soft soil foundations. These soft soil foundations have low bearing capacity, high compressibility, and are prone to uneven settlement. Therefore, special attention needs to be paid to foundation treatment and roadbed stability when constructing infrastructure, especially roadbeds, in these areas.

[0003] In shallow sea reclamation areas, uneven settlement of soft soil foundations is one of the main causes of pavement structure damage. Traditional foundation treatment methods, such as directly laying roadbed materials on soft soil foundations, are difficult to effectively solve this problem. Uneven settlement can lead to cracks and subsidence in the pavement, affecting the service life of the road and driving safety.

[0004] While existing vacuum preloading and surcharge preloading methods can improve the bearing capacity of the foundation, they have long construction cycles, high costs, and significant environmental impacts. Deep mixing methods, while improving foundation performance, also have significant environmental impacts and are complex to implement. Precast concrete piles and crushed stone piles can improve the bearing capacity of the foundation, but in current technologies, the tops of these piles are usually flush with the soft soil surface. This results in a lack of effective connection between the subsequently laid roadbed material and the soft soil, easily leading to slippage and instability. Traditional roadbed paving methods often fail to effectively prevent the generation and propagation of cracks, especially on soft soil foundations, where cracking is a more pronounced problem. This not only affects the service life of the road but may also lead to traffic safety issues.

[0005] Therefore, how to provide a new technical solution to solve the above problems, improve the stability and service life of infrastructure, and ensure driving safety is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a composite roadbed structure for shallow sea reclamation areas, aiming to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A composite roadbed structure for shallow sea reclamation areas is constructed on the soft mud layer of the shallow sea reclamation area; comprising: A pile foundation system, wherein the pile foundation system is driven into the soft mud layer and the top of the pile foundation is exposed above the top surface of the soft mud layer; A support / reset assembly, comprising an upper support member and a lower support member disposed on a single pile of the pile foundation system, the upper support member being fixed to the top of the single pile, the lower support member being connected to the single pile and located at the top surface of the soft mud layer, and an elastic reset member being connected between the upper support member and the lower support member; A transition reinforcement layer is provided on the top surface of the soft mud layer and fills the space between the top surface of the soft mud layer and the top surface of the pile foundation system; A composite reinforced isolation system, comprising a lower geogrid layer and an upper geogrid layer, wherein the lower geogrid layer is disposed in the horizontal plane of the lower support member and is connected to the lower support member, and the upper geogrid layer is disposed in the horizontal plane of the upper support member and is connected to the upper support member; A composite pavement reinforcement layer is provided on the top surface of the transition reinforcement layer to complete the construction of the overall composite roadbed structure.

[0008] Through the above technical solution, the present invention provides rigid support through the pile foundation system, and forms a flexible buffer by combining the elastic reset component of the support / reset component and the geogrid layer of the composite reinforcement isolation system. At the same time, the composite pavement reinforcement layer adopts flexible materials such as asphalt macadam layer and crack-resistant geotextile layer, achieving the effect of "combining rigidity and flexibility", effectively absorbing and reducing stress concentration caused by uneven settlement, preventing reflective cracks, significantly improving the stability of the roadbed and the service life of the road, and adapting to the rapid road construction needs of shallow sea reclamation areas.

[0009] Preferably, in the composite roadbed structure of the shallow sea reclamation area described above, the pile foundation system includes concrete piles arranged in an array on the soft mud layer, and gravel piles disposed between the concrete piles.

[0010] Preferably, in the above-mentioned composite roadbed structure in a shallow sea reclamation area, the top surface of the concrete pile is higher than the surface of the mud layer, and the top surface of the crushed stone pile is flush with the surface of the mud layer.

[0011] Preferably, in the above-mentioned composite roadbed structure for shallow sea reclamation areas, the upper support and the lower support are connected to the concrete pile; the upper support includes a cover that is fastened to the top surface of the concrete pile, and the bottom edge of the cover has an upper flange; the lower support includes a sleeve that is fitted onto the outside of the concrete pile, and the top edge of the sleeve has a lower flange; the elastic reset member is connected between the upper flange and the lower flange.

[0012] Preferably, in the above-mentioned composite roadbed structure in a shallow sea reclamation area, the side wall of the casing is provided with a vertical strip-shaped limiting hole, the outer wall of the concrete pile has a positioning block, the positioning block is slidably connected to the strip-shaped limiting hole, and under the tension of the elastic reset member, the positioning block abuts against the bottom end of the strip-shaped limiting hole.

[0013] Preferably, in the above-mentioned composite roadbed structure for shallow sea reclamation areas, the elastic resetting member includes an upper tie rod, a lower tie rod, a tension spring, and an outer sleeve; the upper tie rod is bolted to the upper flange, the lower tie rod is bolted to the lower flange, and the tension spring is connected between the upper tie rod and the lower tie rod; the top end of the outer sleeve is threaded to the bottom end of the upper tie rod, and the bottom end of the outer sleeve is slidably sleeved on the outside of the top end of the lower tie rod, so that the outer sleeve surrounds the outside of the tension spring.

[0014] Preferably, in the above-mentioned composite roadbed structure for shallow sea reclamation areas, both the upper flange and the lower flange are provided with multiple through holes. The through holes are used to tie the lower geogrid layer and the upper geogrid layer, and to connect the upper tie rod and the lower tie rod.

[0015] Preferably, in the composite roadbed structure of the shallow sea reclamation area described above, the transition reinforcement layer includes, from bottom to top, a first sand layer, a gravel layer, and a second sand layer.

[0016] Preferably, in the above-mentioned composite roadbed structure for shallow sea reclamation areas, the lower geogrid layer is located between the mud layer and the first sand layer; the upper geogrid layer is located between the gravel layer and the second sand layer.

[0017] Preferably, in the composite roadbed structure of the shallow sea reclamation area described above, the composite pavement reinforcement layer includes, from bottom to top, an asphalt macadam layer, a crack-resistant geotextile layer, a macadam composite layer, and an asphalt concrete layer.

[0018] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a composite roadbed structure for shallow sea reclamation areas. By combining rigid pile foundations with flexible resetting components, a multi-level coordinated bearing system is formed. With the addition of bidirectional geogrid reinforcement and layered transition structure, the load is effectively dispersed and differential settlement is suppressed. At the same time, the flexible pavement layer is used to absorb stress, achieving a balance between rigidity and flexibility. This significantly improves the stability, crack resistance, and durability of the reclamation roadbed, meeting the needs of rapid road construction and heavy traffic. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 The attached figure is a cross-sectional view of the composite roadbed structure in the shallow sea reclamation area provided by the present invention; Figure 2 The attached figure is a schematic diagram of the support / reset assembly provided by the present invention; Figure 3 The attached figure is a partial structural schematic diagram of the connection between the lower support member and the single pile provided by the present invention; Figure 4 The attached figure is a partial structural schematic diagram of the connection between the upper support member and the single pile provided by the present invention; Figure 5 The attached figure is an exploded view of the structure of the elastic reset member provided by the present invention; Figure 6 The attached figure is a schematic diagram of the soft mud layer in the shallow sea reclamation area provided by the present invention; Figure 7 The attached figure is a schematic diagram of the pile foundation system for driving piles into a soft mud layer provided by the present invention; Figure 8 The attached figure is a schematic diagram of the installation of a support / reset assembly on a pile foundation system provided by the present invention; Figure 9 The attached figure is a schematic diagram of connecting the lower geogrid layer to the lower support member of the support / reset assembly provided by the present invention; Figure 10 The attached figure is a schematic diagram of laying the first sand layer according to the present invention; Figure 11 The attached figure is a schematic diagram of the laying of a crushed stone layer provided by the present invention; Figure 12 The attached figure is a schematic diagram of connecting a geogrid layer to the upper support member of the support / reset assembly provided by the present invention; Figure 13 The attached figure is a schematic diagram of laying the second sand layer according to the present invention; Figure 14 The attached figure is a schematic diagram of the asphalt macadam layer provided by the present invention; Figure 15 The attached figure is a schematic diagram of the laying of the crack-resistant geotextile layer provided by the present invention; Figure 16 The attached figure is a schematic diagram of the laying of the crushed stone composite layer provided by the present invention; Figure 17 The attached figure is a schematic diagram of the asphalt concrete layer provided by the present invention.

[0021] in: 1- Soft mud layer; 2-Pile foundation system; 21-Concrete pile; 211-Positioning block; 22-Gravel pile; 3-Support / Reset Assembly; 31-Upper Support; 311-Cover; 312-Upper Flange; 32-Lower Support; 321-Shell; 3211-Strip Limiting Hole; 322-Lower Flange; 33-Elastic Reset Component; 331-Upper Pull Rod; 332-Lower Pull Rod; 333-Tension Spring; 334-Outer Tube; 34-Through Hole; 4-Transitional reinforcement layer; 41-First sand layer; 42-Gravel layer; 43-Second sand layer; 5- Composite reinforced isolation system; 51- Lower geogrid layer; 52- Upper geogrid layer; 6-Composite pavement reinforcement layer; 61-Asphalt macadam layer; 62-Crack-resistant geotextile layer; 63-Macadam composite layer; 64-Asphalt concrete layer. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] See appendix Figure 1 To be continued Figure 12 This invention discloses a composite roadbed structure for shallow sea reclamation areas, constructed on a soft mud layer 1 in the shallow sea reclamation area; including: Pile foundation system 2, the pile foundation system 2 is driven into the soft mud layer 1, and the top of the pile foundation system 2 is exposed on the top surface of the soft mud layer 1; The support / reset assembly 3 includes an upper support member 31 and a lower support member 32 installed on the individual pile of the pile foundation system 2. The upper support member 31 is fixed to the top of the individual pile, and the lower support member 32 is connected to the individual pile and located at the top surface of the soft mud layer 1. An elastic reset member 33 is connected between the upper support member 31 and the lower support member 32. Transition reinforcement layer 4 is provided on the top surface of soft mud layer 1 and fills the space between the top surface of soft mud layer 1 and the top surface of pile foundation system 2. The composite reinforced isolation system 5 includes a lower geogrid layer 51 and an upper geogrid layer 52. The lower geogrid layer 51 is located in the horizontal plane where the lower support member 32 is located and is connected to the lower support member 32. The upper geogrid layer 52 is located in the horizontal plane where the upper support member 31 is located and is connected to the upper support member 31. Composite pavement reinforcement layer 6 is placed on the top surface of transition reinforcement layer 4 to complete the construction of the overall composite subgrade structure.

[0024] To further optimize the above technical solution, the pile foundation system 2 includes concrete piles 21 arranged in an array on the soft mud layer 1, and gravel piles 22 disposed between the concrete piles 21. The concrete piles 21 provide rigid support, and the gravel piles 22 enhance drainage and lateral restraint, forming a pile foundation system that is both rigid and flexible, effectively dispersing the load and accelerating the consolidation of the soft mud layer.

[0025] To further optimize the above technical solution, the top surface of the concrete pile 21 is higher than the surface of the soft mud layer 1, and the top surface of the crushed stone pile 22 is flush with the surface of the soft mud layer 1. The top surface of the concrete pile 21 is higher than the soft mud layer 1, forming a high-level rigid support point, while the top surface of the crushed stone pile 22 is flush with the soft mud layer 1, working together to bear the shallow load and enhance the overall integrity and deformation resistance of the roadbed.

[0026] See appendix Figure 2 To be continued Figure 4 The upper support member 31 and the lower support member 32 are connected to the concrete pile 21. The upper support member 31 includes a cover 311 that is fastened to the top surface of the concrete pile 21, and the bottom edge of the cover 311 has an upper flange 312. The lower support member 32 includes a cover 321 that is sleeved on the outside of the concrete pile 21, and the top edge of the cover 321 has a lower flange 322. An elastic reset member 33 is connected between the upper flange 312 and the lower flange 322. The upper and lower support members are connected by the cover 311 and the cover 321 with a flange connecting the elastic reset member 33 to form a resettable node, realizing the elastic adjustment and automatic reset of vertical displacement.

[0027] To further optimize the above technical solution, the side wall of the casing 321 is provided with a vertical strip-shaped limiting hole 3211, and the outer wall of the concrete pile 21 has a positioning block 211. The positioning block 211 is slidably connected to the strip-shaped limiting hole 3211. Under the tension of the elastic reset member 33, the positioning block 211 abuts against the bottom end of the strip-shaped limiting hole 3211. The casing 321 is provided with a strip-shaped limiting hole 3211 that slides in cooperation with the pile positioning block 211, so that the lower support is limited under the tension of the elastic reset member 33, preventing the support system from becoming unstable.

[0028] See appendix Figure 5 The elastic reset component 33 includes an upper pull rod 331, a lower pull rod 332, a tension spring 333, and an outer sleeve 334. The upper pull rod 331 is bolted to the upper flange 312, and the lower pull rod 332 is bolted to the lower flange 322. The tension spring 333 is connected between the upper pull rod 331 and the lower pull rod 332. The top end of the outer sleeve 334 is threaded to the bottom end of the upper pull rod 331, and the bottom end of the outer sleeve 334 is slidably sleeved on the outside of the top end of the lower pull rod 332, so that the outer sleeve 334 surrounds the outside of the tension spring 333. The elastic reset component 33 adopts a combination structure of tension spring 333 and inner and outer sleeve rods, which has the dual functions of tension reset and corrosion protection, improving durability and reset accuracy.

[0029] To further optimize the above technical solution, multiple through holes 34 are provided on both the upper flange 312 and the lower flange 322. These through holes 34 are used to bind the lower geogrid layer 51 and the upper geogrid layer 52, and also to connect the upper tie rod 331 and the lower tie rod 332. The through holes 34 on the flanges achieve integrated fixing of the geogrid and the tie rods, enhancing the geogrid's tensile strength and structural integrity.

[0030] To further optimize the above technical solution, the transition reinforcement layer 4 consists of a first sand layer 41, a crushed stone layer 42, and a second sand layer 43 from bottom to top. The transition reinforcement layer 4 adopts a sand-crushed stone-sand layered structure to achieve stress diffusion, drainage, and leveling functions, thereby improving the stability and impermeability of the roadbed transition section.

[0031] To further optimize the above technical solution, the lower geogrid layer 51 is located between the soft mud layer 1 and the first sand layer 41; the upper geogrid layer 52 is located between the gravel layer 42 and the second sand layer 43. The lower geogrid 51 is placed between the soft mud layer and the first sand layer, and the upper geogrid 52 is placed between the gravel layer and the second sand layer, forming a two-way reinforcement and isolation system, which effectively suppresses differential settlement.

[0032] To further optimize the above technical solution, the composite pavement reinforcement layer 6 comprises, from bottom to top, an asphalt macadam layer 61, a crack-resistant geotextile layer 62, a macadam composite layer 63, and an asphalt concrete layer 64. The composite pavement reinforcement layer 6 achieves an integrated pavement structure that combines flexible load-bearing capacity, crack resistance, and durability by laying the asphalt macadam 61, crack-resistant geotextile 62, macadam composite layer 63, and asphalt concrete 64 layer by layer.

[0033] The following is in conjunction with the appendix Figure 6 To be continued Figure 17 This embodiment describes in detail the construction method of the composite roadbed structure in shallow sea reclamation areas: First step, see appendix Figure 6 Preparation of the mud layer: First, a mud layer 1 is formed in the shallow sea reclamation area. This layer is a natural sedimentary layer after reclamation, with a thickness of generally 2.0 to 4.0 meters, the specific thickness of which is determined according to the reclamation process and geological conditions. Before construction, the mud layer 1 needs to be preliminarily leveled and compacted to ensure the stability of subsequent pile foundation construction.

[0034] The second step is shown in the appendix. Figure 7 Construction of the pile foundation system: A pile foundation system 2 is driven into the soft mud layer 1. The pile foundation system 2 includes arrayed concrete piles 21 and gravel piles 22. The concrete piles 21 are precast or cast in place, with a pile diameter of 0.4 to 0.6 meters. The pile length is determined according to the depth of the soft mud layer, usually driven 1.0 to 2.0 meters into the bearing layer below the soft mud layer 1, with the top exposed 0.5 to 1.0 meters above the top surface of the soft mud layer 1. The gravel piles 22 are constructed using the vibratory driving method, with a pile diameter of 0.3 to 0.5 meters, and the pile top is flush with the surface of the soft mud layer 1. The pile spacing is determined according to the design load, usually 2.0 to 3.0 meters.

[0035] Step 3, see appendix Figure 8 Install the support / reset assembly: Install the support / reset assembly 3 on the concrete pile 21. First, fit the sleeve 321 of the lower support member 32 onto the outside of the concrete pile 21. Then, drive the positioning block 211 into the concrete pile 21, so that the strip-shaped limiting hole 3211 on the sleeve 321 is slidably connected to the positioning block 211 on the outer wall of the concrete pile 21. Then, fasten the cover 311 of the upper support member 31 onto the top surface of the concrete pile 21, and connect the elastic reset member 33 through the upper flange 312 and the lower flange 322. The upper pull rod 331 of the elastic reset member 33 is bolted to the upper flange 312, the lower pull rod 332 is bolted to the lower flange 322, the tension spring 333 is connected between the upper pull rod 331 and the lower pull rod 332, and the outer sleeve 334 surrounds the outside of the tension spring 333. After installation, under the pulling force of the elastic reset member 33, the positioning block 211 abuts against the bottom end of the strip-shaped limiting hole 3211, forming a reset mechanism.

[0036] Step 4, see appendix Figure 9The lower geogrid layer 51 of the composite reinforced isolation system 5 is laid in the horizontal plane where the lower support 32 is located, i.e., the top surface of the soft mud layer 1. The lower geogrid layer 51 is tied and fixed through the through holes 34 on the lower flange 322 to ensure a reliable connection with the lower support 32. Adjacent geogrids are also tied and fixed together. The thickness of the lower geogrid layer 51 is generally 0.1 to 0.2 meters, and the material is high-strength polypropylene or polyester geogrid.

[0037] Step 5, see appendix Figure 10 First sand layer: The first sand layer 41 of the transition reinforcement layer 4 is laid on the top surface of the soft mud layer 1 and the lower geogrid layer 51. The first sand layer 41 uses medium-coarse sand with a thickness of 0.3 to 0.5 meters. It needs to be compacted in layers during laying, and the compaction degree is not less than 95%. The first sand layer 41 fills the space between the top surface of the soft mud layer 1 and the top surface of the crushed stone pile 22, and connects with the exposed part of the concrete pile 21.

[0038] Step 6, see appendix Figure 11 Laying a crushed stone layer: A crushed stone layer 42, which is a transitional reinforcement layer 4, is laid on the first sand layer 41. The crushed stone layer 42 uses graded crushed stone with a particle size of 5 to 40 mm and a thickness of 0.2 to 0.4 meters. It needs to be vibrated and compacted during laying to form an intermediate layer for drainage and load diffusion.

[0039] Step 7, see appendix Figure 12 The upper geogrid layer 52 of the composite reinforced isolation system 5 is laid on the horizontal plane where the upper support 31 is located, i.e., the top surface of the crushed stone layer 42. The upper geogrid layer 52 is tied and fixed through the through holes 34 on the upper flange 312 to ensure a reliable connection with the upper support 31. Adjacent geogrids are also tied and fixed together. The thickness of the upper geogrid layer 52 is generally 0.1 to 0.2 meters, and the material is the same as that of the lower geogrid layer 51.

[0040] Step 8, see appendix Figure 13 Laying the second sand layer: The second sand layer 43 of the transition reinforcement layer 4 is laid on the crushed stone layer 42 and the upper geogrid layer 52. The second sand layer 43 uses medium-coarse sand with a thickness of 0.3 to 0.5 meters. It needs to be compacted during laying, with a compaction degree of not less than 95%, in order to provide a flat base surface for subsequent road construction.

[0041] Step 9, see appendix Figure 14 Laying the asphalt macadam layer: On the top surface of the second sand layer 43, the asphalt macadam layer 61 of the composite pavement reinforcement layer 6 is laid. The asphalt macadam layer 61 uses asphalt mixture and has a thickness of 0.1 to 0.2 meters. It needs to be compacted during laying to form a waterproof and load-bearing base layer.

[0042] Step 10, see appendix Figure 15Laying a crack-resistant geotextile layer: A crack-resistant geotextile layer 62 of the composite pavement reinforcement layer 6 is laid on the asphalt macadam layer 61. The crack-resistant geotextile layer 62 is relatively thin, generally 0.02 to 0.05 meters, and the material is polypropylene or glass fiber geotextile. It must be laid flat and without wrinkles to play a role in crack resistance and stress dispersion.

[0043] Step 11, see appendix Figure 16 Laying the crushed stone composite layer: A crushed stone composite layer 63 of the composite pavement reinforcement layer 6 is laid on the crack-resistant geotextile layer 62. The crushed stone composite layer 63 uses cement-stabilized crushed stone or asphalt crushed stone, with a thickness of 0.15 to 0.25 meters. It needs to be compacted during laying to form the main load-bearing layer.

[0044] Step 12, see appendix Figure 17 Next, an asphalt concrete layer is laid: Finally, an asphalt concrete layer 64 of the composite pavement reinforcement layer 6 is laid on the crushed stone composite layer 63. The asphalt concrete layer 64 uses high-performance asphalt concrete with a thickness of 0.2 to 0.3 meters. It needs to be finely compacted during laying to form a smooth and wear-resistant pavement surface.

[0045] The above construction steps complete the construction of the overall composite roadbed structure. This structure, through a pile foundation system, support / reset components, and layered reinforcement, effectively resists uneven settlement, improving roadbed stability and service life. During construction, the thickness and compaction degree of each layer must be strictly controlled to ensure compliance with design specifications.

[0046] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0047] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A composite roadbed structure for shallow sea reclamation areas, constructed on a soft mud layer (1) in the shallow sea reclamation area; characterized in that, include: A pile foundation system (2) is driven into the mud layer (1) and its top is exposed on the top surface of the mud layer (1); The support / reset assembly (3) includes an upper support member (31) and a lower support member (32) disposed on the individual pile of the pile foundation system (2). The upper support member (31) is fixed to the top of the individual pile, and the lower support member (32) is connected to the individual pile and located at the top surface of the soft mud layer (1). An elastic reset member (33) is connected between the upper support member (31) and the lower support member (32). Transition reinforcement layer (4), the transition reinforcement layer (4) is provided on the top surface of the soft mud layer (1) and fills the space between the top surface of the soft mud layer (1) and the top surface of the pile foundation system (2); A composite reinforced isolation system (5) includes a lower geogrid layer (51) and an upper geogrid layer (52). The lower geogrid layer (51) is located in the horizontal plane of the lower support member (32) and is connected to the lower support member (32). The upper geogrid layer (52) is located in the horizontal plane of the upper support member (31) and is connected to the upper support member (31). Composite pavement reinforcement layer (6) is provided on the top surface of the transition reinforcement layer (4) to complete the construction of the overall composite roadbed structure.

2. The composite roadbed structure for shallow sea reclamation areas according to claim 1, characterized in that, The pile foundation system (2) includes concrete piles (21) arranged in an array on the mud layer (1) and gravel piles (22) disposed between the concrete piles (21).

3. A composite roadbed structure for shallow sea reclamation areas according to claim 2, characterized in that, The top surface of the concrete pile (21) is higher than the surface of the mud layer (1), and the top surface of the crushed stone pile (22) is flush with the surface of the mud layer (1).

4. A composite roadbed structure for shallow sea reclamation areas according to claim 3, characterized in that, The upper support member (31) and the lower support member (32) are connected to the concrete pile (21); the upper support member (31) includes a cover (311) fastened to the top surface of the concrete pile (21), and the bottom edge of the cover (311) has an upper flange (312); the lower support member (32) includes a sleeve (321) sleeved on the outside of the concrete pile (21), and the top edge of the sleeve (321) has a lower flange (322); the elastic reset member (33) is connected between the upper flange (312) and the lower flange (322).

5. A composite roadbed structure for shallow sea reclamation areas according to claim 4, characterized in that, The side wall of the casing (321) is provided with a vertical strip-shaped limiting hole (3211). The outer wall of the concrete pile (21) has a positioning block (211). The positioning block (211) is slidably connected to the strip-shaped limiting hole (3211). Under the pulling force of the elastic reset member (33), the positioning block (211) abuts against the bottom end of the strip-shaped limiting hole (3211).

6. A composite roadbed structure for shallow sea reclamation areas according to claim 5, characterized in that, The elastic reset component (33) includes an upper pull rod (331), a lower pull rod (332), a tension spring (333), and an outer sleeve (334); the upper pull rod (331) is bolted to the upper flange (312), the lower pull rod (332) is bolted to the lower flange (322), and the tension spring (333) is connected between the upper pull rod (331) and the lower pull rod (332); the top end of the outer sleeve (334) is threaded to the bottom end of the upper pull rod (331), and the bottom of the outer sleeve (334) is slidably sleeved on the outside of the top end of the lower pull rod (332), so that the outer sleeve (334) surrounds the outside of the tension spring (333).

7. A composite roadbed structure for shallow sea reclamation areas according to claim 6, characterized in that, Both the upper flange (312) and the lower flange (322) are provided with multiple through holes (34). The through holes (34) are used to tie the lower geogrid layer (51) and the upper geogrid layer (52), and to connect the upper tie rod (331) and the lower tie rod (332).

8. A composite roadbed structure for shallow sea reclamation areas according to any one of claims 1-7, characterized in that, The transition reinforcement layer (4) consists of a first sand layer (41), a gravel layer (42), and a second sand layer (43) from bottom to top.

9. A composite roadbed structure for shallow sea reclamation areas according to claim 8, characterized in that, The lower geogrid layer (51) is located between the mud layer (1) and the first sand layer (41); the upper geogrid layer (52) is located between the gravel layer (42) and the second sand layer (43).

10. A composite roadbed structure for shallow sea reclamation areas according to claim 9, characterized in that, The composite pavement reinforcement layer (6) consists of an asphalt macadam layer (61), a crack-resistant geotextile layer (62), a macadam composite layer (63), and an asphalt concrete layer (64) from bottom to top.

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