STP1077

    Acoustic Emission Analysis and Ultrasonic Velocity Imaging in the Study of Rock Failure

    Published: Jan 1991


      Format Pages Price  
    PDF (184K) 11 $25   ADD TO CART
    Complete Source PDF (7.7M) 11 $68   ADD TO CART


    Abstract

    Two methods were used to examine the effects of stress changes and microfracture activity during Brazilian disk tests performed on Lac du Bonnet Granite. Acoustic emission analyses examining source locations and source mechanisms led to two main findings. Firstly, the sources were clustered in the regions with the greatest difference between the minimum and maximum principal stresses. Secondly many sources involved some degree of shear motion. This indicates that dilatancy in these rocks may be largely controlled by hybrid shear-tensile microfractures. Ultrasonic tomographic imaging of p-wave speed was the second technique used to study stress induced effects on the samples. The images created have successfully delineated areas of the rock with high stress concentrations.

    Keywords:

    ultrasonic imaging, difference tomography, acoustic emission, source location, source mechanism, Brazilian tests


    Author Information:

    Falls, SD
    Rock Physics and Engineering Seismology Laboratory, Department of Geological Sciences, Queen's UniversityQueen's University, Kingston,

    Chow, T
    Rock Physics and Engineering Seismology Laboratory, Department of Geological Sciences, Queen's UniversityQueen's University, Kingston,

    Young, RP
    Rock Physics and Engineering Seismology Laboratory, Department of Geological Sciences, Queen's UniversityQueen's University, Kingston,

    Hutchins, DA
    Rock Physics and Engineering Seismology Laboratory, Department of Geological Sciences, Queen's UniversityQueen's University, Kingston,


    Paper ID: STP19108S

    Committee/Subcommittee: E07.06

    DOI: 10.1520/STP19108S


    CrossRef ASTM International is a member of CrossRef.