Experimental studies of a geological measuring system for tunnel with ultrasonic transducer

D. H. Kim, U. Y. Kim, S. P. Lee, H. Y. Lee, J. S. Lee

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

Abstract

Predicting ground conditions ahead of the tunnel face has been one of the most important requirements of tunnel construction. This study investigated the development and application of a high resolution ultrasonic wave imaging system, which captures the multiple reflections of ultrasonic waves at the interface, to detect discontinuities at laboratory scale rock mass model. Ultrasonic wave reflection imaging based on A- and B-modes was obtained through stacking, signal compensation, demodulation, and display. Experiments were carried out by using horizontal scanning and rotational scanning. Experimental studies showed that the rotational scanning method was able to identify horizontal and inclined discontinuities and the cavity on the plaster block at a fixed location. Furthermore, two discontinuities including horizontal and inclined discontinuity planes were detected. The rotating scanning technique produced images similar to those obtained by the typical horizontal scanning technique. This paper contains basic theories about the ultrasonic transducer and several experimental application results. The full-scale field application and other application will be scheduled in the future.

Original languageEnglish
Title of host publicationGeotechnical Aspects of Underground Construction in Soft Ground - Proceedings of the 6th International Symposium, IS-SHANGHAI 2008
Pages555-560
Number of pages6
Publication statusPublished - 2009
Event6th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, IS-SHANGHAI 2008 - Shanghai, China
Duration: 2008 Apr 102008 Apr 12

Publication series

NameGeotechnical Aspects of Underground Construction in Soft Ground - Proceedings of the 6th International Symposium, IS-SHANGHAI 2008

Other

Other6th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, IS-SHANGHAI 2008
CountryChina
CityShanghai
Period08/4/1008/4/12

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Civil and Structural Engineering
  • Building and Construction

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