Abstract
A system identification approach is used to formulate a discrete element analytical model to predict the behavior of natural jointed rock specimens subject to static normal stress and dynamic shear in a compliant loading apparatus. Model parameters are synthesized to correspond to various low and high frequency physical phenomena that are observed to occur in available experimental data for welded tuff specimens subject to harmonic shear. An approximate interlock/friction model is postulated for the rock interface dynamics, while various spring/mass and damper systems represent the loading apparatus. Furthermore, it is found that primary and secondary asperities of the joint interface roughness must be characterized in order to provide an adequate model of the observed experimental behavior. It is found that the fundamental jointed rock behavior can be related to basic excitation frequency and primary joint asperities, while higher frequency phenomena are associated with compliant mode responses of the loading apparatus that are excited by secondary joint asperities. Recommendations are given for impact of the results on current joint friction model theories.
Published Version
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