Abstract
The freeze‐thaw cycles cause deterioration in mechanical properties of levee soil and further endanger the pavement structure on the embankment. This study attempts to comprehensively understand the mechanical response of pavement after freeze‐thaw cycles. In this paper, the freeze‐thaw cycles test under an open system was carried out, and then the triaxial compression test was conducted. Based on the test results, the effects of freeze‐thaw cycles, temperature range, initial dry density, and initial moisture content of embankment soil on the mechanical response of road structure after freeze‐thaw were calculated and analyzed. Finally, the stability of the slope of the levee was evaluated. The results show that the number of freeze‐thaw cycles has the most significant impact on the mechanical response of pavement, the stress and strain of the structural layers vary in different ranges, and the pavement deflection increases by 5 times after 7 freeze‐thaw cycles. However, the initial dry density and initial moisture content of the soil have little influence on the pavement structure, and the temperature range will exert an influence when it exceeds a certain threshold.
Highlights
IntroductionIntroduction e SonghuaRiver levee is located in the seasonal frozen regions in Northeast China. e parts that pass across the urban area need to be used as the subgrade of urban roads with transportation
Introduction e SonghuaRiver levee is located in the seasonal frozen regions in Northeast China. e parts that pass across the urban area need to be used as the subgrade of urban roads with transportation
The reduction of subgrade performance after freeze-thaw cycles will lead to a serious reduction in pavement bearing capacity [10]. e investigations of subgrade bearing capacity in the literatures mostly focused on the change of elastic modulus [11, 12] and the California bearing ratio (CBR) [13, 14]
Summary
Introduction e SonghuaRiver levee is located in the seasonal frozen regions in Northeast China. e parts that pass across the urban area need to be used as the subgrade of urban roads with transportation. E pavement is most susceptible to the influence of seasonal changes in temperature in road structure, so the mechanical properties of pavement materials after the freeze-thaw cycle are widely concerned [3, 4]. Only limited researches involve the changes in the stress and deformation of pavement structure caused by the deterioration of subgrade fill materials after freeze-thaw cycles. Few researches are studying the mechanical response of pavement caused by the performance degradation of subgrade soil under different initial conditions and different atmospheric temperatures. Erefore, in order to improve the design level of the pavement in the seasonal frozen regions, it is urgent to study the response of the pavement structure under the deterioration of the mechanical properties in the subgrade after freeze-thaw cycles Konrad and Roy [1] considered that the surface heave and longitudinal cracking of pavement were related to the frost susceptibility of subgrade soils from the perspective of geotechnical engineering. erefore, in order to improve the design level of the pavement in the seasonal frozen regions, it is urgent to study the response of the pavement structure under the deterioration of the mechanical properties in the subgrade after freeze-thaw cycles
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