Research on road engineering detection method based on GPR technology Liu Tao, Li Jia, Zheng Zhi-gang, Huang Zhi, Jiang Jian, Hong Shao-you, Li You-zhi and Wu Yin-tan E3S Web Conf., 165 (2020) 04014 Published online: 01 May 2020 DOI: 10.1051/e3sconf/202016504014