Triaxial Compressive Strength
Rock is known to behave as a function of the confining pressure. The triaxial compression test is commonly used to simulate the stress conditions under which most underground rock masses exist. This test method covers the determination of the strength of cylindrical rock core specimens in an undrained state under triaxial compression loading. The test provides data useful in determining the strength and elastic properties of rock, namely: Shear strength at various lateral pressures, angle of internal friction, cohesion intercept, and Young's modulus. It should be observed that this method makes no provision for pore pressure measurements. Thus the strength values determined are in total stress, that is, not corrected for pore pressures.
1 or more
Right circular cylinder, with diameter of at least 1 7/8 in and a length to diameter ratio of 2 to 2.5
Rock, Rock Strength, Rock Triaxial