Acoustical methods for monitoring failure in rock.
New Horizons in Rock Mech Part VI-14th Symp Rock Mech Am Soc Civil Eng, 1973; :649-687
Monitoring elastic wave velocity variation and the acoustic emission in rock in the process of fracturing affords a method of assessing the structural quality of rock, detecting the onset and progress of fracturing, and providing information on the attitudes of fractures and the mode of failure. The technique used in the present investigation, referred to as bvm (biaxial velocity monitoring), monitors longitudinal (compressional) wave velocity in the directions of greatest o1 and least o3 principal stresses. Velocity data are concurrently obtained with stress-strain characteristics during unconfined and conventional triaxial compression tests to permit the interpretation of velocity variation in terms of the deformational and fracture characteristics of the rock. Since it is imperative that convenient and feasible methods be developed to appraise rock properties and to predict rock behavior underground, the encouraging results of these investigations suggest that these combined acoustic monitoring techniques may be used profitably in solving rock mechanics or geophysical problems concerned with determining the structural integrity of mine, tunnel, or dam structures, with delineating the zone of fractures in blasting experiments, or with earthquake prediction.
Mining-industry; Failure-analysis; Rock-bursts; Rock-mechanics; Ground-stability; Monitoring-systems; Acoustics; Elastic-properties; Acoustic-vibration; Structural-analysis; Disaster-prevention; Stress
OP; Conference/Symposia Proceedings
New Horizons in Rock Mech., Part VI. 14th Symp. Rock Mech., Am. Soc. Civil Eng