Abstract：
Nondestructive testing of the thickness of a reinforced concrete invert of a new railway is carried out using the broadband multi-channel transient Rayleigh wave method. A contrastive analysis of the key parameters of optimal settings regarding the geophone, earthquake source, zero-offset and group interval is conducted through an experiment. The global optimal method is used to invert the Rayleigh dispersion curve to avoid the problem of the local optimal solution of objective function and reduce the accuracy requirement of the initial model. Engineering practices show that the results are consistent with the core sampling data and effectiveness of the detection method is verified.
2018, Vol. 55 