CN-224227582-U - Compound drainage frost heaving prevention heat preservation roadbed in season frozen area

CN224227582UCN 224227582 UCN224227582 UCN 224227582UCN-224227582-U

Abstract

The utility model discloses a composite drainage frost heaving prevention heat preservation roadbed for a quaternary frozen area, and belongs to the technical field of roadbed engineering. The roadbed structure is sequentially provided with a roadbed layer, an upper drainage heat preservation component, a cement stabilized gravel layer, a filler layer, a gravel layer and a bottom reverse filtering drainage component from top to bottom. The upper drainage heat preservation assembly comprises a heat preservation plate, and first impermeable geotechnical cloth and first hygroscopic geotechnical cloth are laid on the upper surface of the heat preservation plate and used for draining pavement water seepage and water on the upper portion of the roadbed out of two sides of the roadbed through capillary action. The bottom reverse filtering drainage assembly comprises a reverse filtering layer, a drainage layer with a preset gradient is constructed at the bottom of the reverse filtering layer, second impermeable geotextile is paved, second moisture-absorbing geotextile is arranged between the reverse filtering layer and the gravel layer, and water seepage geotextile is paved outside the reverse filtering layer and connected to blind ditches on two sides. According to the utility model, through the heat preservation effect of the heat preservation plate and the combination of the active drainage and seepage prevention effects of the multi-layer geotextile, frost heaving and slurry turning of the roadbed can be effectively inhibited, and the service life of the road is prolonged.

Inventors

WANG LIANGJIE
YAN ZHONGRUI
YANG JUNLIN
WAN XUSHENG
JIANG YUAN
YAN ZICHENG
LI DELONG
La Jianliang
Luo shuang

Assignees

西南石油大学

Dates

Publication Date: 20260512
Application Date: 20250527

Claims (9)

1. The composite drainage frost heaving prevention heat preservation roadbed for the quaternary freezing zone is characterized by comprising a roadbed layer (1), an upper drainage heat preservation component, a cement stabilized gravel layer (3), a filler layer (4), a gravel layer (5) and a bottom reverse filtering drainage component which are sequentially arranged from top to bottom; the upper drainage heat preservation assembly comprises a heat preservation layer (2), wherein a first impermeable geotextile (A2) is laid on the upper surface of a plate of the heat preservation layer (2), and a first moisture absorption geotextile (A1) is laid on the upper surface of the first impermeable geotextile (A2); the bottom reverse filtering drainage assembly comprises a reverse filtering layer (C), the reverse filtering layer (C) is arranged below the gravel layer (5), slope structures (7) inclining towards two sides are formed at the bottom of the reverse filtering layer (C), second impermeable geotechnical cloth is paved on the slope structures (7), and second hygroscopic geotechnical cloth (B1) is paved above the reverse filtering layer (C) and between the reverse filtering layer and the gravel layer (5).
2. The roadbed according to claim 1, wherein the heat insulation layer (2) is an XPS heat insulation board.
3. The composite drainage frost heaving prevention heat preservation roadbed for a quaternary frozen area according to claim 1, wherein the first hygroscopic geotextile (A1) and the second hygroscopic geotextile (B1) are woven by polypropylene strips and capillary water-guiding fiber bundles and extend to the outer edge of a roadbed slope shoulder.
4. The subgrade according to claim 1, wherein said reverse filtration layer (C) comprises a fine particle layer (C1), a medium particle layer (C2) and a coarse particle layer (C3) laid sequentially from top to bottom.
5. The subgrade according to claim 4, characterized in that the outer peripheral surface of the reverse filtering layer (C) is coated with a first water seepage geotextile (C4), and blind ditches (C5) are connected to the bottoms of two sides of the reverse filtering layer (C).
6. Roadbed according to claim 1, characterized in that the slope of the slope structure (7) is 2% -5%.
7. Roadbed according to claim 1, characterized in that the surface of the roadbed layer (1) is formed as a drainage slope inclined to both sides, and that drainage ditches (6) are provided on both sides of the roadbed structure.
8. The subgrade according to claim 1, characterized in that a second water permeable geotextile is laid between said gravel layer (5) and filler layer (4).
9. The subgrade according to claim 1, characterized in that said upper drainage insulation assembly further comprises a cover soil layer (A3) overlying said first absorbent geotextile (A1), said pavement layer (1) being laid over said cover soil layer (A3).

Description

Compound drainage frost heaving prevention heat preservation roadbed in season frozen area Technical Field The utility model relates to the technical field of roadbed engineering, in particular to a roadbed heat-insulating and anti-freezing structure for seasonal frozen soil areas. Background The seasonal frozen soil area in China is widely divided, the road subgrade in the area is subjected to freeze thawing cycle action all the year round, diseases such as frost heaving and slurry turning easily occur, the traffic capacity and the service life of the road are seriously influenced, and high maintenance cost is generated. The core cause of frost heaving of the roadbed is the presence of sufficient moisture in the roadbed soil and the sustained low temperature conditions cause the moisture to freeze. Therefore, the key for solving the roadbed freezing injury in the seasonal frozen soil area is to effectively discharge the water in the roadbed, prevent the external water source from being supplied and combine with the heat preservation measure. The prior art is concerned, but there is still room for improvement in drainage efficiency, thermal insulation durability and structural stability. Disclosure of Invention The utility model aims to provide a composite drainage frost heaving prevention heat preservation roadbed for a season frozen area, which solves the problem that the existing season frozen soil area roadbed is easy to frost heaving and slurry, so that the service life is short. In order to achieve the above purpose, the present utility model provides the following technical solutions: A composite drainage frost heaving prevention heat preservation roadbed in a season frozen area comprises a roadbed layer, an upper drainage heat preservation component, a cement stabilized gravel layer, a filler layer, a gravel layer and a bottom reverse filtering drainage component which are sequentially arranged from top to bottom; The upper drainage heat insulation assembly comprises a heat insulation layer, wherein a first impermeable geotextile is laid on the upper surface of a plate of the heat insulation layer, and a first moisture absorption geotextile is laid on the upper surface of the first impermeable geotextile; The bottom reverse filtering drainage assembly comprises a reverse filtering layer positioned below the gravel layer, a slope surface structure inclining towards two sides is formed at the bottom of the reverse filtering layer, second impermeable geotechnical cloth is paved on the slope surface structure, and second moisture absorption geotechnical cloth is paved between the top of the reverse filtering layer and the gravel layer. The second anti-seepage geotechnical cloth can effectively prevent soil loss of the reverse filtering layer, and the drainage layer with the gradient of 3% is constructed at the bottom, so that water in the reverse filtering layer can be effectively discharged into blind ditches, and the water content of roadbed is reduced. The first moisture-absorbing geotextile and the second moisture-absorbing geotextile are formed by compositely weaving polypropylene strips and capillary water-guiding fiber bundles and extend to the outer edge of a roadbed shoulder. Advantageous effects Compared with the prior art, the utility model has the following beneficial effects: 1. The high-efficiency drainage and seepage prevention is realized by arranging the moisture absorption geotechnical cloth and the seepage prevention geotechnical cloth with specific functions in the upper drainage heat preservation component and the bottom reverse filtering drainage component and combining the slope structure and the blind ditches, so that the water seepage of the road surface, capillary water in the road bed and possible groundwater can be actively conducted away from the main structure of the road bed, and the water content of the road bed is obviously reduced. 2. The heat loss of the soil body of the roadbed is effectively reduced, the development of freezing depth is slowed down, and the occurrence condition of frost heaving is restrained from the source by the arrangement of the heat-insulating layer. 3. The frost heaving prevention and the slurry turning prevention are combined, and by means of the combination of heat preservation and drainage, the frost heaving caused by low temperature in winter is prevented, and the slurry turning phenomenon caused by saturated water in spring thawing period is avoided. 4. The structure is stable and durable, the arrangement of the reverse filtering layer ensures the long-term effectiveness of the drainage system, prevents blockage caused by loss of fine particles, and the selection and parameter design of the materials of each structural layer are beneficial to improving the whole bearing capacity and stability of the roadbed, prolonging the service life of the roadbed and reducing the maintenance cost. Drawings FIG. 1 is a schematic diagram of the overall s