基于探地雷达的沥青路面压实度检测研究综述及展望

Literature Review and Prospect of Asphalt Pavement Compaction Detection Based on Ground Penetrating Radar

沥青路面施工过程中,压实质量是影响其使用性能的重要因素,压实不足或压实过度均会使得沥青路面过早出现损坏。为推动探地雷达(GPR)在沥青路面压实度检测领域的发展,更全面地评价沥青路面的压实质量,系统阐述了探地雷达检测原理、系统组成及数据处理方法;对探地雷达在沥青路面压实度检测领域的研究现状进行了归纳和总结。研究结果表明:沥青混合料的介电特性受其组成成分体积比、雷达频率及路面温度等因素的影响;通过建立复合介电模型可以预测沥青混合料的压实度,但其精确性和适用范围仍有待提高;对于含水沥青混合料,水的存在会使得介电常数测量值偏大,从而影响密度预测的准确性。未来可优化探地雷达信号处理手段,提升探地雷达对沥青混合料介电常数的检测精度;进一步建立具有广泛适用范围的复合介电模型,提高密度预测的精确性和适用范围;将探地雷达与压路机进行结合,建立完善的沥青路面压实度实时监测系统。

The compaction quality of asphalt pavement in the construction process is an important factor affecting its performance,and insufficient compaction or excessive compaction will cause premature damage to asphalt pavement.In order to promote the development of ground penetrating radar(GPR)in the field of asphalt pavement compaction detection,and more comprehensively evaluate the compaction quality of asphalt pavement,the detection principle,system composition and data processing method of GPR were systematically expounded.The research status of GPR in the field of asphalt pavement compaction detection was summarized and concluded.The research results show that the dielectric properties of asphalt mixture are affected by the factors such as the volume ratio of its components,radar frequency and pavement temperature.The compaction degree of asphalt mixture can be predicted by establishing a composite dielectric model,but its accuracy and application range still need to be improved.For the water-bearing asphalt mixture,the presence of water may cause the measured dielectric constant to be biased,thereby affecting the accuracy of density prediction.In the future,the signal processing method of GPR can be optimized to improve the detection accuracy of GPR on the dielectric constant of asphalt mixture.The composite dielectric model with a wide range of application is further established to improve the accuracy and scope of density prediction.The GPR and the road roller are combined to establish a complete real-time monitoring system for asphalt pavement compaction.