半刚性基层沥青路面车辙等效温度

Effective Temperature of Rutting for Semi-Rigid Base Asphalt Pavement

摘要:

为准确预测沥青路面服役期间的车辙深度，简化预测流程，基于温度场预测模型和车辙预估模型计算10个地区半刚性基层沥青路面的车辙等效温度，分析了面层厚度和地区因素对等效温度的影响，建立了考虑深度、年平均气温和年降雨量的预估模型，对模型进行了全面的检验。结果表明，面层厚度只对0.5 cm深度处的车辙等效温度有显著影响，地区对各亚层的车辙等效温度均有显著影响；基于车辙等效温度沿深度的分布特性，提出了外延性和稳健性较好的模型；结合地区修正因子，建立了考虑地区差异的车辙等效温度模型。与国内外已有的模型相比，建立的车辙等效温度模型对于不同的设计条件、材料和交通量具有更好的适用性。

Abstract:

This paper aims to predict the rutting depth more accurately and simplify the prediction process. First， the effective temperature for rutting of semi-rigid base asphalt pavement in 10 sites was calculated based on the full-thickness asphalt pavement temperature field prediction model and rutting prediction model. Then， the effect of asphalt layer thickness and site factors on the effective temperature were analyzed. Afterwards， a prediction model was established， incorporating the depth， annual average temperature （AAT）， and annual rainfall （AR）. Finally， the model was verified and compared with other existing models. The results show that the asphalt layer thickness only has a significant effect at a depth of 0.5 cm， and the site significantly affects each sublayer. A model with a better extensibility and robustness is proposed based on the distribution characteristics of effective temperature along the depth. Combined with the regional correction factor， an effective temperature prediction model considering regional differences is established. Compared with the existing models， the effective temperature model established in this paper is suitable for different design conditions， materials， and traffic volumes.