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An innovative application of borehole acoustic image and amplitude logs for geotechnical site investigation

Kao Hsien-Chang, Chou Po-Yi, Lo Hung-Chieh

Acta Geophysica

2020

Vol. 68, no. 6

1821--1832

Down-hole acoustic televiewer (ATV logging) is a geophysical well-logging device known to be able to reveal underground in-depth image. However, reviewing the current developments in the area of geotechnical engineering, ATV logging data were predominantly used for the purpose of visualizing and calculating the specifc structural features in an open borehole, and nothing more. Noticeably, to the majority of engineering applications, it appears that ATV logging played a minor role compared to other geophysical borehole logging tools. Our study does not take it for granted. A systematic study is presented of the signifcance and consequent applications of ATV logging. The signifcance of correlation between acoustic amplitude and diferent geotechnical parameters is discussed and found to be consistent with previous fndings. The result tells that ATV logging is actually able to provide timely and ground-truth information during site characterization, if properly used. Additionally, in our study, a simple rock mass evaluation index, Aco-RQD, is proposed, which is applicable to all aspects of geotechnical engineering as long as the continuous ATV logging data are available.