Highway shield tunnel inspection using integrated GPR equipment

The Ground Penetrating Radar (GPR) is an effective method for shield tunnel grouting layer inspection. However, due to the large cross sections of highway shield tunnels, traditional manual inspections cannot meet the requirement. In accordance with the characteristics of the highway shield tunnel, a vehicle mounted integrated GPR inspection equipment is presented. Together with manual inspections, the tunnel can be checked comprehensively. By analyzing the GPR data recorded by equipment and human force respectively, both advantages and limitations of the two gathering modes are discussed and suggestions are provided.