Rock bolt integrity evaluation in tunnelling using ultrasonic NDT techniques

Jong-Sub Lee, H. J. Kim, In Mo Lee, S. I. Han, Y. J. Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Rock bolts play a crucial role in the reinforcement of Single-shell tunnels and rock slopes as rock bolts become a main support system. Numerical and experimental studies are performed to evaluate the integrity of rock bolts encapsulated by grouting paste using a transmission method of ultrasonic guided waves. Numerical simulation shows that the optimal frequency range is 20-70 kHz in the first longitudinal L(1) mode for the rock bolt NDT system. Analytical and experimental results represent the velocities of the ultrasonic guided wave increase with increase in the defect ratio. This study demonstrates that the transmission method of ultrasonic guided waves may be a valuable tool for the evaluation of the rock bolt integrity.

Original languageEnglish
Title of host publication"Proceedings of the 33rd ITA-AITES World Tunnel Congress - Underground Space - The 4th Dimension of Metropolises"
Pages321-326
Number of pages6
Volume1
Publication statusPublished - 2007 Dec 1
Event33rd ITA-AITES World Tunnel Congress - Underground Space - The 4th Dimension of Metropolises, WTC 2007 - Prague, Czech Republic
Duration: 2007 May 52007 May 10

Other

Other33rd ITA-AITES World Tunnel Congress - Underground Space - The 4th Dimension of Metropolises, WTC 2007
CountryCzech Republic
CityPrague
Period07/5/507/5/10

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ASJC Scopus subject areas

  • Civil and Structural Engineering

Cite this

Lee, J-S., Kim, H. J., Lee, I. M., Han, S. I., & Lee, Y. J. (2007). Rock bolt integrity evaluation in tunnelling using ultrasonic NDT techniques. In "Proceedings of the 33rd ITA-AITES World Tunnel Congress - Underground Space - The 4th Dimension of Metropolises" (Vol. 1, pp. 321-326)