Anti-settlement roadbed structure

Abstract

The invention relates to the technical field of highway construction, in particular to an anti-sedimentation roadbed structure which comprises a soft soil layer, a composite substrate layer, a light filler layer and a pavement layer which are sequentially laid from bottom to top, and the composite substrate layer comprises a plurality of geotechnical cloth layers and a light concrete layer which are sequentially arranged from bottom to top. A lower anti-settling layer and an upper anti-settling layer are further arranged in the lightweight concrete layer, the lower anti-settling layer is composed of a porous material and a water absorption expansion material, the upper anti-settling layer is composed of a high-molecular polymer and a microporous material, and the lightweight filler layer is composed of lightweight foam concrete and a fiber reinforced material; settlement of the roadbed is effectively prevented, and the stability and the bearing capacity of the roadbed are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of highway construction, and particularly relates to a settlement-proof roadbed structure. Background Art

[0002] In road construction and infrastructure projects, the roadbed structure is an important part to ensure the stability and safety of the road. Especially in soft soil environments, the roadbed structure faces greater challenges. Soft soil has a high water content, low bearing capacity, and poor stability, which easily leads to accidents such as roadbed settlement and landslides. Traditional roadbed structures such as concrete cushions, geogrids, and quicklime bags, the quicklime bags generate solid calcium compounds through the reaction of quicklime with water, and the volume expands to make up for the soil loss caused by water flow and the internal cavities of the roadbed. However, each quicklime bag is prone to uneven water absorption in the soft soil environment, and the roadbed structure is prone to uneven settlement, resulting in pavement cracking and deformation, affecting the service performance and lifespan of the road. Summary of the Invention

[0003] The purpose of the present invention is to provide a settlement-proof roadbed structure, which can effectively prevent the settlement of the roadbed and improve the stability and bearing capacity of the roadbed.

[0004] To achieve the above purpose, the technical solution of the present invention is as follows: A settlement-proof roadbed structure includes a soft soil layer, a composite base layer, a lightweight filler layer, and a road surface layer laid in sequence from bottom to top. The composite base layer includes multiple geotextile layers and a lightweight concrete layer arranged in sequence from bottom to top. A lower settlement-proof layer and an upper settlement-proof layer are also provided in the lightweight concrete layer. The lower settlement-proof layer is composed of a porous material and a water-absorbing and swelling material, and the upper settlement-proof layer is composed of a polymer and a microporous material. The lightweight filler layer is composed of lightweight foam concrete and a fiber-reinforcing material.

[0005] Further, an anti-slip net is provided between two adjacent geotextile layers, and the anti-slip net is a nylon net.

[0006] Further, an expansion agent is incorporated in the lightweight concrete layer, and the expansion agent is a sulfoaluminate expansion agent.

[0007] Further, the porous material is ceramsite or zeolite, and the water-absorbing and swelling material is polyacrylamide.

[0008] Further, the polymer is polyurethane, and the microporous material is diatomite.

[0009] Further, the density of the lightweight foam concrete is 200 - 500 kg / m³, and the fiber-reinforcing material is polypropylene fiber.

[0010] Further, an anti-seepage layer is provided at the bottom of the road surface layer.

[0011] Furthermore, the anti-seepage layer is modified asphalt.

[0012] The beneficial effects of the present invention are as follows: The combined design of the porous material and the water-absorbing and swelling material in the lower anti-settlement layer effectively drains the accumulated water inside the roadbed, prevents soil erosion, and reduces the settlement risk; the combined design of the polymer and the microporous material in the upper anti-settlement layer improves the structural strength and drainage performance of the roadbed, and further enhances the anti-settlement performance; the lightweight filler layer is laid above the composite base layer and is composed of lightweight foam concrete and fiber-reinforcing materials. The low density of the lightweight foam concrete reduces the self-weight of the filler layer, and the fiber-reinforcing material improves the structural strength and stability of the filler layer, effectively preventing the settlement of the roadbed and improving the stability and bearing capacity of the roadbed. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the present invention.

[0014] Reference Signs: 1, soft soil layer; 2, composite base layer; 21, geotextile layer; 22, lightweight concrete layer; 23, lower anti-settlement layer; 24, upper anti-settlement layer; 3, lightweight filler layer; 4, road surface layer; 41, anti-seepage layer; 5, anti-slip net. Detailed Embodiments

[0015] For the convenience of understanding by those skilled in the art, the present invention will be further described below in conjunction with the embodiments and the drawings. The content mentioned in the embodiments does not limit the present invention. The present invention will be described in detail below with reference to the drawings.

[0016] As Figure 1 shown, an anti-settlement roadbed structure includes a soft soil layer 1, a composite base layer 2, a lightweight filler layer 3, and a road surface layer 4 laid in sequence from bottom to top. The composite base layer 2 includes multiple geotextile layers 21 and lightweight concrete layers 22 arranged in sequence from bottom to top. A lower anti-settlement layer 23 and an upper anti-settlement layer 24 are further arranged in the lightweight concrete layer 22. The lower anti-settlement layer 23 is composed of a porous material and a water-absorbing and swelling material, the upper anti-settlement layer 24 is composed of a polymer and a microporous material, and the lightweight filler layer 3 is composed of lightweight foam concrete and fiber-reinforcing materials.

[0017] The geotextile has good water permeability and filtration performance, which can effectively drain the accumulated water inside the roadbed and prevent soil erosion; the lower anti-settlement layer 23 is composed of porous materials and water-absorbing and swelling materials. The porous materials contribute to drainage, and the water-absorbing and swelling materials swell after absorbing water to fill the soil voids and reduce the settlement risk; the upper anti-settlement layer 24 is composed of a polymer and microporous materials. The polymer has good adhesion and stability, and the microporous materials contribute to drainage and ventilation, further enhancing the anti-settlement performance; the lightweight filler layer 3 is laid above the composite base layer 2 and is composed of lightweight foam concrete and fiber-reinforced materials. The low density of the lightweight foam concrete reduces the self-weight of the filler layer, and the fiber-reinforced materials improve the structural strength and stability of the filler layer.

[0018] A non-slip net 5 is provided between two adjacent geotextile layers 21, and the non-slip net 5 is a nylon net; the setting of the non-slip net 5 increases the friction between the geotextile layers 21, prevents the slippage between the layers, and improves the overall stability of the roadbed.

[0019] An expansion agent is incorporated into the lightweight concrete layer 22, and the expansion agent is a sulfoaluminate expansion agent; the use of the sulfoaluminate expansion agent causes the lightweight concrete to expand in volume during the curing process, enhancing the density and bearing capacity of the concrete and further improving the stability of the roadbed.

[0020] The porous material is ceramsite or zeolite, and the water-absorbing and swelling material is polyacrylamide; ceramsite or zeolite as the porous material helps to drain the accumulated water inside the roadbed, prevent soil erosion, and reduce the settlement risk; polyacrylamide swells after absorbing water to fill the soil voids and further enhances the stability of the roadbed.

[0021] The polymer is polyurethane, and the microporous material is diatomite; polyurethane has good adhesion and stability, enhancing the structural strength of the upper anti-settlement layer 24; diatomite as the microporous material helps to drain water and ventilate, further improving the stability and drainage performance of the roadbed.

[0022] The density of the lightweight foam concrete is 200 - 500 kg / m³, and the fiber-reinforced material is polypropylene fiber; the low density of the lightweight foam concrete reduces the self-weight of the filler layer and the settlement risk. The polypropylene fibers are evenly distributed in the lightweight foam concrete, improving the structural strength and stability of the filler layer.

[0023] An anti-seepage layer 41 is provided at the bottom of the road surface layer 4; the anti-seepage layer 41 is modified asphalt; the modified asphalt has good anti-seepage performance and durability. The setting of the anti-seepage layer 41 prevents water from penetrating into the roadbed, further reducing the settlement risk and extending the service life of the roadbed.

[0024] The anti-settlement roadbed structure of the present invention not only improves the stability and adaptability in soft soil environments, but also effectively prevents the settlement of the roadbed, ensuring the stability and safety of the road.

[0025] The above are only preferred embodiments of the present invention, and there is no limitation to the present invention in any form. Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art, without departing from the technical solution of the present invention, when making some changes or modifications using the above-disclosed technical content as equivalent embodiments of equivalent changes, as long as they do not depart from the technical solution content of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical means of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. A settlement-proof roadbed structure, characterized in that: It includes a soft soil layer (1), a composite base layer (2), a lightweight filler layer (3) and a road surface layer (4) laid successively from bottom to top. The composite base layer (2) includes multiple geotextile layers (21) and a lightweight concrete layer (22) arranged successively from bottom to top. A lower anti-settlement layer (23) and an upper anti-settlement layer (24) are also arranged in the lightweight concrete layer (22). The lower anti-settlement layer (23) is composed of a porous material and a water-absorbing and swelling material. The upper anti-settlement layer (24) is composed of a polymer and a microporous material. The lightweight filler layer (3) is composed of lightweight foam concrete and a fiber-reinforced material.

2. The anti-settlement roadbed structure according to claim 1, wherein: An anti-slip net (5) is arranged between two adjacent geotextile layers (21), and the anti-slip net (5) is a nylon net.

3. The anti-settlement roadbed structure according to claim 1, characterized in that: An expansion agent is mixed in the lightweight concrete layer (22), and the expansion agent is a sulfoaluminate expansion agent.

4. The anti-settlement subgrade structure according to claim 1, characterized in that: The porous material is ceramsite or zeolite, and the water-absorbing and swelling material is polyacrylamide.

5. The anti-settlement subgrade structure according to claim 1, characterized in that: The polymer is polyurethane, and the microporous material is diatomite.

6. The anti-settlement roadbed structure according to claim 1, characterized in that: The density of the lightweight foam concrete is 200 - 500 kg / m³, and the fiber-reinforced material is polypropylene fiber.

7. The anti-settlement roadbed structure according to claim 1, characterized in that: An anti-seepage layer (41) is arranged at the bottom of the road surface layer (4).

8. The anti-settlement subgrade structure according to claim 7, characterized in that: The anti-seepage layer (41) is modified asphalt.

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