Journal of Shandong University(Engineering Science) ›› 2019, Vol. 49 ›› Issue (3): 80-85.doi: 10.6040/j.issn.1672-3961.0.2019.099

• Civil Engineering • Previous Articles     Next Articles

Structural design of transitional layer between subgrade and semi-rigid base

Cong WANG1(),Lu ZHANG2,Xiaoming YI2   

  1. 1. Highway Monitoring and Response Center, Ministry of Transport of the P.R.C., Beijing 100029, China
    2. National Engineering Research Center of Road Maintenance Technologies, Beijing 100095, China
  • Received:2019-03-05 Online:2019-06-20 Published:2019-06-27
  • Supported by:
    交通部科技资助项目(2006353337160)

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Abstract:

The special design of the transition layer between subgrade and semi-rigid base was scarce in the design system of pavement. The mechanism of the transition layer was studied, and then based on the analyses of reinforcing effect of transition layer under different modulus and thickness, the reinforcement incremental coefficient and optimal reinforcement model were proposed. Meanwhile, combined with typical semi-rigid base pavement structure, the economic modulus and thickness of transition layer were put forward. Results showed that the reinforcing effect was promoted as the increasement of the modulus and thickness of the transition layer, but the reinforcing efficiency was reduced. In order for higher reinforcing efficiency, the modulus of the transition layer should be 200~500 MPa, and the thickness should be not less than 20 cm.

Key words: the transition layer, structural design, reinforcement incremental coefficient, optimal reinforcement model, economic modulus

CLC Number: 

  • U416

Fig.1

The reinforcement of the transition layer to the lower layer"

Table 1

Calculation parameters of layer structure without transition layer"

层位模量/MPa厚度/m泊松比
面层1 0000.20.25
基层1 2000.20.20
路基400.35

Fig.2

Influence of transition layer thickness and modulus on the equivalent modulus"

Table 2

Calculation parameters of semi-rigid asphalt pavement structure"

结构层E/MPaμ厚度/cm
结构1结构2结构3
上面层1 4000.25555
中面层1 2000.25555
下面层1 0000.255
上基层1 5000.20161616
下基层1 5000.20161616
底基层8000.201818
路基400.35

Fig.3

Influence of transition layer thickness and modulus on the equivalent modulus"

Fig.4

Influence of transition layer thickness on the equivalent modulus"

Fig.5

Reinforceing increment coefficient at different transition layer thickness"

Fig.6

Reinforceing increment coefficient at different subgrade modulus"

Fig.7

The model of the optimum reinforcement theory"

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