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1.1 ,These test methods cover the creep behavior of intact weak and hard rock core in fixed states of stress at ambient (room) or elevated temperatures. For creep behavior at lower temperatures refer to Test Method D5520. The methods specify the apparatus, instrumentation, and procedures necessary to determine the strain as a function of time under sustained load at constant temperature and when applicable, constant humidity.
1.1.1 ,Hard rocks are considered those with a maximum axial strain at failure of less than 2 ,%. Weak rocks include such materials as salt, potash, shale, and weathered rock, which often exhibit very large strain at failure.