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This paper presents a state-of-the-art review of the subject of acoustic emission as it pertains to the area of rock mechanics, and includes references to some 150 recent papers. Although a limited discussion of laboratory oriented studies are included, the major thrust of the paper is to field applications in geotechnical engineering. The paper first discusses the general concepts involved in the acoustic emission technique and briefly reviews the early history of the subject. This is followed by a general discussion of techniques currently in use for monitoring and analysis of acoustic emission data, and a description of a number of recent and on-going field studies where acoustic emission techniques are being employed in the general area of geotechnical engineering. Finally, the paper considers the various limitations of the technique as well as areas where further research and development are considered necessary.

Presented is a comprehensive review of the applications of acoustic emission in the field of rock mechanics. Acoustic emission experiments in rock mechanics were initiated in North America in the late 1930s as part of a study by the U. S. Bureau of Mines into problems associated with mine design and alleviation of rock bursts. More recently acoustic emission techniques had been employed to an increasing degree for the laboratory study of basic deformation and failure mechanisms in geologic materials. This paper outlines the major rock mechanics areas where acoustic emission techniques are being applied, and includes a brief description of a number of basic and applied studies.

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