Abstract
The Mechanical Response of Pre-Fractured Rock in Compression This paper describes experimental procedures and results obtained from an experimental study of pre-cracked rock specimens. In these experiments specimens of Westerly granite and Cedar City tonalite were broken in special fixtures and subsequently retested in a triaxial apparatus. Confining pressures up to 7 kb were employed. The rock specimens were well fragmented during the pre-cracking process. The results indicate a number of interesting features, including the significant retention of load-carrying ability under many stress conditions and an increase in maximum deformation. A comparison is made with frictional data determined elsewhere for Westerly granite; the close agreement in maximum stress suggests the importance of friction in the specimen mechanical behavior.
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