Structural condition assessment and fatigue stress analysis of cement concrete pavement based on the GPR and FWD

摘要

This study showed a method for calculating the fatigue stress under different foundation models based on the evaluation results of the thickness, strength, and damage conditions of each structural layer of cement concrete pavement by Falling Weight Deflectometer (FWD) and Ground Penetrating Radar (GPR). This method corrected the deviation of load and temperature stress of cement concrete layer calculated by inaccurate pavement structural parameters under different foundation models. At the same time, we analyzed the influence of pavement structural parameters on the load and temperature fatigue stress and the sensitivity of load and temperature fatigue stress to the change of pavement structural parameters. The research results show that the load and temperature stress of the cement concrete layer in various foundation models are mainly affected by the thickness of the cement concrete layer and the base and are much higher than other structural parameters. Although the influence of structural parameters on load and temperature stress in different foundation models is consistent, the difference of load and temperature stress calculated under different foundation models is pronounced. Therefore, selecting the appropriate foundation model for the fatigue performance evaluation of old cement concrete pavement is particularly important. We recommended selecting the proper foundation model for the fatigue stress analysis of pavement in the future according to the internal structural condition of pavement and the applicable scope of different foundation models.

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