抄録
This paper presents a non-destructive field testing technique for evaluate the depth of crack, whose existence and particularly progress in concrete can be a severe safety hazard to the tunnels (underground structures). Although several testing methods have been developed to measure the concrete crack depth, their performance is not satisfactory. Herein, a new testing technique is proposed to monitor the cracking depth and progress through detecting the propagation of energy flow density of Rayleigh wave. Field experiments have demonstrated that this new method provides more accurate estimation of the depth of concrete crack than those by existing methods.
