Time-Dependent Damage and Creep of Brittle Rock

by L. S. Costin, Sandia Natl Lab, Geomechanics Div, Albuquerque, NM, USA,

Document Type: Proceeding Paper

Part of: Coastal Zone '89


In this paper, some results of a combined analytical-experimental study of the relationship between subcritical microcrack growth due to stress corrosion and the time-dependent deformation and failure of brittle rock are reported. An analysis of creep and failure under uniaxial stress was performed using a continuum damage model. The model includes evolutionary equations which describe the growth of microcracks due to stress corrosion as well as incremental increases in applied stress. Also, the effect of interaction between neighboring cracks on the rate of crack growth is included. The model was used to predict the relationship between strain rate and failure stress for uniaxial compression at constant strain rate. These results are compared to the results of uniaxial compression experiments on Tennessee marble.

Subject Headings: Failure analysis | Cracking | Time dependence | Rock mechanics | Brittleness | Stress analysis | Strain rates | Tennessee | United States

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