An Empirical Relation for Dilatant Behavior in Brittle Rocks
Among the inputs required by computer codes used to simulate wave propagation through rocks are the material properties and equations of state of the rock undergoing elastic as well as inelastic deformation. Ultrasonic velocities, hydrostat, failure surface, and in most cases, three-dimensional stresses and strains along various loading and unloading paths, are measured in the laboratory. After some manipulation, these data are used in the codes as material constants or as tables to calculate the changes in stress state from one time step to the next. In the absence of the ability to predict either the response of a given rock type to stress based on only a few measured quantities or the behavior of one rock based on that of another, it is presently necessary to perform an entire series of laboratory experiments to obtain input data for each different computer problem.
KeywordsMaximum Shear Stress Maximum Principal Stress Radial Strain Uniaxial Stress Confine Pressure
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