TY - GEN
T1 - Experimental studies of a geological measuring system for tunnel with ultrasonic transducer
AU - Kim, D. H.
AU - Kim, U. Y.
AU - Lee, S. P.
AU - Lee, H. Y.
AU - Lee, J. S.
PY - 2009
Y1 - 2009
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=79952295315&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:79952295315
SN - 9780415484756
T3 - Geotechnical Aspects of Underground Construction in Soft Ground - Proceedings of the 6th International Symposium, IS-SHANGHAI 2008
SP - 555
EP - 560
BT - Geotechnical Aspects of Underground Construction in Soft Ground - Proceedings of the 6th International Symposium, IS-SHANGHAI 2008
T2 - 6th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, IS-SHANGHAI 2008
Y2 - 10 April 2008 through 12 April 2008
ER -