Non-destructive evaluation of shield tunnel condition using GPR and 3D laser scanning

Abstract

Shield tunnel requires routine inspections for construction safety and quality control. The rapidness, non-destructiveness and high precision of GPR and 3D laser scanning technology enable them to be widely and increasingly used in tunnel detection. The evaluation of Yingbin No.3 Road Tunnel is presented in this paper to illustrate the application of GPR in the inspection on thickness of grouting layer behind the segment and 3D laser scanning technology in the testing on surface situation of tunnel liner. The advantages and limitations of the above-mentioned two methods are discussed in the paper and suggestions are provided.