NCHRP 1-37A法预测沥青路面性能的验证研究

路面结构性能预测模型是路面结构设计的经济技术分析的核心,预测模型的精度将直接影响设计和分析结果的可靠程度。美国2004年通过NCHRP 1-37A项目推出的力学-经验设计方法受到了国际道路界的广泛重视。以某高速公路柔性基层试验段为依托工程,对NCHRP 1-37A设计方法中性能预测模型在我国的适用性进行了验证研究。按照NCHRP 1-37模型的要求,确定了材料、交通和气候等各方面的输入参数。利用性能模型预测了试验段的车辙、疲劳开裂和低温开裂,通过和试验段通车两年的现场检测数据相比较,表明NCHRP 1-37A模型的短期预测结果精度较好。根据当地半刚性基层沥青路面的使用经验,长期车辙预测值可能偏小。

Validity Study on Predicting the Performance of Asphalt Pavement Using NCHRP 1-37A Method

TPavement performance prediction models are essential for pavement structure design and economic analysis,and the accuracy of the model directly influences the reliability of design and analysis results.The mechanistic-empirical pave- ment design method developed under NCHRP 1-37A project has gained great attention.Validity of the NCHRP 1-37A per- formance models was evaluated through an asphalt pavement test section with flexible base.Materials,traffic and environ- ment parameters were found out,according to the requirements of NCHRP 1-37A models.Rutting,fatigue cracking and ther- mal cracking were predicted and the predicted distresses were compared with the measured distresses.The results show that short-term prediction results of NCHRP 1-37A models are reasonably accurate and that of long-term rutting prediction ap- pears to be smaller,based on local experiences on asphalt pavements with semi-rigid bases,while the actual accuracy of long-term prediction results needs to be verified by continuous performance monitoring of the test section.