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Shock and Vibration
Volume 2016, Article ID 1025276, 10 pages
http://dx.doi.org/10.1155/2016/1025276
Research Article

Experimental Research and Numerical Simulation on Grouting Quality of Shield Tunnel Based on Impact Echo Method

College of Civil and Transportation Engineering, Hohai University, Nanjing, Jiangsu 210098, China

Received 29 June 2016; Revised 19 September 2016; Accepted 16 October 2016

Academic Editor: Sergio De Rosa

Copyright © 2016 Fei Yao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

To identify shield grouting quality based on impact echo method, an impact echo test of segment-grouting (SG) test piece was carried out to explore effect of acoustic impedance of grouting layers and grouting defects on impact echo law. A finite element numerical simulation on the impact echo process was implemented. Test results and simulation results were compared. Results demonstrated that, under some working conditions, finite element simulation results and test results both agree with theoretical values. The acoustic impedance ratio of SG material influenced the echo characteristics significantly. But thickness frequency could not be detected under some working conditions because the reflected energy is weak. Frequency feature under grouting defects was more complicated than that under no grouting defects.