Uses of Acoustic Emissions as a Non-Destructive Testing Method to Monitor Grouting


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Title: Uses of Acoustic Emissions as a Non-Destructive Testing Method to Monitor Grouting

Author(s): Robert M. Koerner, James D. Leaird, and Joseph P. Welsh

Publication: Special Publication

Volume: 83


Appears on pages(s): 85-102

Keywords: acoustics; evaluation; grouting; monitors; nondestruc-tive tests; pressure grouting; seepage. --

Date: 10/1/1984

The detection and monitoring of subsurface flow phenomena, such as, seepage, grouting and hydrofracturing, are significant and largely unsolved problem areas. As a nondestructive testing technique, the acoustic emission (AE) method seems to be a likely candidate technique for application to these problems. This paper describes the AE method, in general, and a parti-cular AE system which holds significant promise in this regard. It is a multichannel AE system which will eventually source locate the emissions in three dimensions and in real time on a CRT screen. A series of laboratory tests, where equipment selection and proper system tuning were made, are described. Two field tests where chemical and cement grouts were being injected were also monitored with positive results, indicating the technical feasibility of the method. Computer software is presently being developed and, when complete, further field tests will be forthcoming.