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Triaxial Tests on Large Rock Specimens
Final rept. 15 May 1969-15 Aug 1971
IIT RESEARCH INST CHICAGO IL
Pagination or Media Count:
A study was conducted to determine the effect of specimen size on the mechanical response of rock. Specimens of Cedar City tonalite Cedar City, Utah and Charcoal Black granite Cold Springs, Minnesota ranging in size from 2 in. dia. to 32 in. dia. 24 in. dia. for the tonalite were tested in triaxial compression. In addition to the standard triaxial test stress trajectory, one specimen of each rock type was loaded uniaxial strain to simulate true one- dimensional compression. Test data included axial and circumferential strain at up to 30 locations on the largest specimens, surface wires to indicate crack propagation on the 12 inch and larger specimens, axial and radial stresses and the confining pressure media temperature. Data were recorded under loading, unloading and reloading conditions. The test data for each specimen size and rock type were fit to a non-linear hysteretic model to determine variation in the model parameters as a function of specimen size.
APPROVED FOR PUBLIC RELEASE