Abstract
This study uses a test section of a highway, a study object, to explore the effect of thickness of the gravel base and asphalt layer on the vertical deformation of the road surface. The thickness of the asphalt layer and graded gravel base is changed. The nonlinear description equation of the relationship between the thickness (h1) of the asphalt layer and the vertical deformation (d1) is established: . The thickness of the asphalt pavement is then determined to reduce vertical deformation. Numerical calculation shows that the maximum vertical deformation of the foundation is within 8 mm, which is less than the 15 mm maximum vertical deformation of the embankment. This level meets the design requirements.
Highlights
Semirigid base asphalt pavement is widely used as the main structure of highway pavements [1,2,3]
The widespread use of the semirigid base resulted in some problems, such as the short service life and reduced performance of the pavement, which will affect the safety of the highway [4,5,6]. e early destruction of the semirigid base asphalt pavement is affected by its structure [7,8,9]
Wu et al [14] simulated the interlayer bonding conditions between the semirigid base layer and the asphalt layer. us, rainwater enters from the pavement structure into the grassroots base and soil. is process is called subgrade softening, which causes early damage on the asphalt pavement. e particle material between the asphalt surface layer and the semirigid base, which can be used as the stress dissipation layer, can effectively reduce the reflection crack of the semirigid material
Summary
Semirigid base asphalt pavement is widely used as the main structure of highway pavements [1,2,3]. E early destruction of the semirigid base asphalt pavement is affected by its structure [7,8,9]. E particle material (graded gravel) between the asphalt surface layer and the semirigid base, which can be used as the stress dissipation layer, can effectively reduce the reflection crack of the semirigid material. Volume compression in some gravel materials may cause the pore water pressure to rise due to dynamic loading, which decreases the material strength. A testing section of the Jiangxi Highway, China, is used as the engineering background to explore the effect of thickness of the bituminous pavement and the graded gravel base on the vertical deformation of the road surface.
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