Capillary barrier roadbed structure capable of effectively preventing and treating roadbed humidification diseases and construction method

Abstract

The invention provides a capillary barrier roadbed structure capable of effectively preventing and treating roadbed humidification diseases. The capillary barrier roadbed structure comprises a drainage ditch, a roadbed and a side slope. The roadbed and the side slope are connected with each other and arranged on foundations. The roadbed comprises a road surface, a superficial roadbed soil layer, a geotechnical cloth or coarse grained soil layer and a deep roadbed soil layer which are sequentially arranged from top to bottom. The side slope comprises a fill side slope layer, the geotechnical cloth or coarse grained soil layer and the deep roadbed soil layer which are sequentially arranged from top to bottom. The superficial roadbed soil layer and the geotechnical cloth or coarse grained soil layer form a first capillary barrier layer. The fill side slope layer and the geotechnical cloth or coarse grained soil layer form a second capillary barrier layer. The first capillary barrier layer and the second capillary barrier layer are connected in sequence. The drainage ditch is arranged at the bottom of the fill side slope layer and connected with the second capillary barrier layer. The roadbed structure is low in construction cost, the humidification diseases caused by cracks on the road surface and dried cracks at a fill side slope and a deep layer thereof can be effectively controlled, uneven settlement of the roadbed due to humidification is reduced, and shearing strength of roadbed soil is maintained.

Description

technical field [0001] The invention belongs to the field of roadbed structures, and in particular relates to a capillary retardation roadbed structure which can effectively prevent roadbed wetting diseases, and also relates to a construction method of the roadbed structure. Background technique [0002] The roadbed instability and uneven settlement of expressways have seriously affected the safety and use of expressways. Especially in the southeast coastal provinces, the Yangtze River Delta and the Pearl River Delta where economic development is fast, these areas have a continental monsoon climate with relatively large rainfall. This not only leads to the fact that the foundation soil usually has the characteristics of high water content, high compressibility, and low strength, but also the roadbed is greatly affected by atmospheric conditions (rainfall and evaporation) after completion. Under the influence of atmospheric conditions, instability and uneven settlement are m...

AI Technical Summary

Problems solved by technology

[0005] First, the coarse-grained soil and fine-grained soil in the capillary retardation layer are easy to infiltrate each other, and cannot form an obvious interface, thus affecting the effect of capillary retardation;

[0006] Second, during construction, coarse-grained soil is difficult to compact, especially on slopes;

[0007] The third is that the coarse-grained soil has a negative impact on the stability of the subgrade. Due to the small cohesion of the coarse-grained soil, the stability is poor, especially at the fill slope.

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