Abstract
This paper investigates the effects of subgrade stiffness and stiffness transition on mechanical responses of asphalt pavement using multiple layered elastic analysis and three-dimensional finite element modeling. The surface deflections and internal stress distributions were analyzed by numerical simulation. The maximum shear stress was used as the indicator to determine the stiffness threshold for subgrade at bridge approach. It was found that the mechanical responses of asphalt pavement were very sensitive to the variation of subgrade stiffness. The stiffness of subgrade at bridge approach should be controlled more than 500 MPa, and the stiffness transition is better to follow an exponential function to ensure the uniform stress distribution of pavement structures. Considering engineering practice and cost factor, a reasonable stiffness range of 1000 MPa–2000 MPa was recommended for the subgrade at bridge approach.
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Acknowledgments
This research was supported by the China Postdoctoral Science Foundation [grant number 2017M620434], the Department of Science & Technology of Shaanxi Province [grant number 2016KJXX-69, 2016ZDJC-24, 2017KCT-13]; and the Special Fund for Basic Scientific Research of Chang’an University [grant number 310821153502 and 310821173501].
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Yang, X., Dong, Y., Zhang, J., Zhu, H. (2019). Subgrade Stiffness Effects on Mechanical Responses of Asphalt Pavement at Bridge Approach. In: Barman, M., Zaman, M., Chang, JR. (eds) Transportation and Geotechniques: Materials, Sustainability and Climate. GeoChina 2018. Sustainable Civil Infrastructures. Springer, Cham. https://doi.org/10.1007/978-3-319-95768-5_9
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