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This paper deals with equipment development, procedural details, and pilot tests of larger specimens of intermediate-quality rock, and rock containing joint systems and weakness planes. The effect of pore-pressure buildup during loading and its graphical representation, that is, the vector curve as employed in soil mechanics, is considered. Work to date indicates that in an undrained triaxial test the pore pressure rises to a peak value at “yielding” of the specimen and then falls off to some lower value at failure. Peak values and final values vary widely for different rock types. The vector curve depicts quite clearly the results of the undrained triaxial test.
rock mechanics, triaxial test, pore pressure, undrained test
Neff, T L
Research engineer, Missouri River Division Laboratory, U. S. Army Corps of Engrs., Omaha, Nebr.