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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Non-destructive methods of failure analysis of rock material in laboratory conditions
 Kožušníková, Alena ; Konečný, Pavel ; Chmelová, J.
Presence of interconnected discontinuities such as cracks, fractures and joints significantly affects both elastic and transport properties of rock masses. Non-destructive methods of failure analysis of rock material are described in this paper.
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Changes of ultrasonic wave velocity in the process of deformation
 Kožušníková, Alena ; Konečný, Pavel ; Chmelová, J.
Ultrasonic wave velocity is physical parameter reflective character of discontinuities in material. Paper represents measurement of ultrasonic wave velocity changes in the process of deformation of rock specimens. There were various types of loading modes: uniaxial or triaxial state of stress, with constant or with the increasing confining pressure, with or without strength failure of specimen. The other physical parameters (permeability, strain) were measured except ultrasonic wave velocity. The results were compared from view of ability to reflect the changes in material in the process of deformation. The tested specimens were analysed by computer tomography to obtain the spatial localisation of discontinuities before and after the tests.
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