1. Dynamic Response and Fatigue Damage of Asphalt Pavement Under Multiple Coupling Factors.
- Author
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Zhao, Kang, Wang, Wentao, Ye, Zhoujing, Wang, Linbing, and Liu, Chang
- Subjects
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ASPHALT pavements , *FATIGUE cracks , *STRAINS & stresses (Mechanics) , *FATIGUE life , *PAVEMENT testing - Abstract
Asphalt pavement exhibits different dynamic responses to vehicle loading in different conditions. It is essential to conduct field full-scale tests to systematically investigate the comprehensive influence of various factors on the dynamic response of asphalt pavement. Based on accelerated pavement testing (APT), this paper presents research on the effects of several factors on the dynamic response of semi-rigid base pavement and fatigue damage of the asphalt layer. The factors include groundwater level, vehicle speed, wheel–ground contact pressure, and temperature. The results show that the amplitudes of vertical stress, vertical strain, and transverse strain decreased with the rise of groundwater level, while the amplitude of longitudinal strain increased. The amplitudes of three-dimensional strain and vertical stress increased with the increase in the wheel–ground contact pressure and temperature, and the decrease in the vehicle speed. Based on the controlled environment-multiaxial loading facility (CE-MLF) system, a dynamic response prediction model of coupled vehicle speed and temperature was established. Based on the natural environment-automatically loaded track (NE-ALT) system, a dynamic response prediction model of coupled vehicle speed and wheel–ground contact pressure was established. According to the dynamic response results, the fatigue life of the upper layer of two test roads was calculated. The fatigue life increased slightly with the increase in the test temperature and speed in the CE-MLF system. In the NE-ALT system, the fatigue life decreased with the increase in the wheel–ground contact pressure and the decrease in speed. Therefore, the coupling effect of speed, wheel–ground contact pressure, and temperature should be considered in evaluating the fatigue life of the asphalt layer. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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