Results of 25 uniaxial creep, stress-relaxation, and constant strain-rate tests in the temperature range 500°C to 600°C on cylinders of Solnhofen limestone are reported. Permanent strains of as much as 20 percent were often produced. Standard experimental procedures for metallurgical creep tests were used. The results of different experimental techniques employed on unconfined rock were found to be consistent and were comparable with data from high-temperature triaxial tests on the same rock. The strength of this rock, extrapolated to geological strain rates, was found to be high compared with stress levels expected in nature.

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