Coupled hydro-mechanical response of saturated asphalt pavement under moving traffic load

Abstract

Based on the Boit's theory, the governing equation was established to account for the response of moisture pavement. The analytical solutions were obtained through the expansion of Fourier series. Furthermore, the effects of parameters (i.e. hydraulic conductivity, traffic load velocity, drainage boundary and solid modulus) on dynamic response were investigated in terms of water-induced damage of pavement. Compared with the dry–elastic pavement, the negative normal stress in saturated asphalt pavement is concentrated beneath the traffic load, which may be a reason for a damage phenomenon in asphalt pavement. Hydraulic conductivity anisotropy plays a significant role in influencing the physical fields. Between vertical and horizontal hydraulic conductivity, the physical field almost depends on vertical hydraulic conductivity rather than horizontal hydraulic conductivity which just affects the horizontal pore-water velocity obviously. Moreover, the drained boundary evidently influences the seepage field of surface course with high permeability.

Keywords::

• pavement dynamic response
• moving traffic load
• water damage
• pore-water pressure
• hydraulic conductivity anisotropy

Notes

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Additional information

Funding

This research has been supported by the Hainan Natural Science Foundation [grant number 511114], the Guizhou Science and Technology Program [grant number 20132167] and the National Natural Science Foundation [grant number 51248006], grant number [51308554] to the first author. The author also appreciates the Guizhou Transportation Science and Technology Foundation [grant number 2013-121-013], and China Postdoctoral Science Foundation [grant number 2012M521563] and the Special Financial Grant from the China postdoctoral Science Foundation [grant number 2013T60865].