沥青路面基面层间结合状态的数值分析

为了真实反映半刚性基层沥青路面层间黏结状态,评价不同处治措施对基面层间结合状态的改进情况,建立了基于逐渐损伤理论的脱层分析数值模型,从细观角度对道路基面层间接触状态进行分析.以脱层分析模型为基础对基质沥青、SBS改性沥青、胶粉改性沥青和精铣刨处治后的层间黏结强度进行预估,并利用JHY-A剪切仪进行层间直剪试验,对数值分析结果进行试验验证.研究结果表明：逐渐损伤的脱层分析模型能更本质地反映不同处治措施对基面层间黏结强度的影响;采用精铣刨处治半刚性基层表面可有效提高基面层间黏结强度,与传统撒布基质沥青、SBS改性沥青、胶粉改性沥青相比,其层间黏结强度可分别提高54.3%、20.0%和12.5%.

Numerical Analysis on Cohesion Between Base and Surface Courses of Asphalt Pavement

In order to truly reflect the bonding state between base and surface courses of semi-rigid base asphalt pavement and evaluate the improvement of different layers treatment, a numerical model based on gradual damage theory was established to analyze road contact state from the mesoscopic angle. In this paper, the asphalt, SBS modified asphalt, rubber modified asphalt, and bonding strength between base and surface were estimated, and JHY-A shear apparatus was used to inspect and verify the prediction results. The results show that gradual damage analysis model can describe more essence of layer bonding condition and reflect the influence of different materials on bond strength; fine milling planer can effectively improve the bonding strength between base and surface courses of semi-rigid base asphalt pavement. Compared to asphalt, SBS modified asphalt and rubber modified asphalt respec- tively fine milling planer can enhance cohesion strength by 54.3%, 20.0% and 12.5% respectively.