混凝土路面脱空是道路主要病害之一,在路面改造修补之前必须对其进行查明。探地雷达法具有无损、高效、直观、经济等优点,已被广泛用于道路检测中。该文简要介绍了探地雷达的基本原理,重点对混凝土路面不同充填脱空区进行雷达正演数值模拟,总结了不同性质脱空区的雷达图像特征和规律,结合工程实例,验证了正演模拟的正确性。该文对雷达图像解译具有较大的指导意义。 Concrete pavement is one of the main road diseases, and must be identified before it is repaired. Ground penetrating radar method has the advantages of non-destructive, efficient, intuitive and economical, has been widely used in road testing. This paper briefly introduces the basic principle of GPR, focuses on numerical simulation of radar forward filling in different filling void area of ​​concrete pavement, summarizes the characteristics and regularities of radar image in different properties of void area, and proves the forward The correctness of the simulation. This article is of great guiding significance to radar image interpretation.