Strength and Deformability of Rocks at Low Temperatures.
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
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Strength tests were made on three types of rock, both air-dry and water-saturated, at temperatures from 25 to -195C, and stressstrain tests were made down to -60C. Strength of air-dry specimens increased with decreasing temperature at an average rate of approximately .002C and quasi-elastic moduli increased at comparable rates. Static fatigue mechanisms in air-dry rock were apparently influenced by temperature-modification of adsorbed water. Strength of water-saturated specimens increased dramatically as pore water froze, and continued to increase down to -120C, where compressive and tensile strengths were greater than room temperature values by factors of 5, 4 and 2 for sandstone, limestone and granite respectively. Compressive stressstrain curves for saturated rocks became steeper after freezing, and initial tangent moduli for saturated high porosity rocks increased by well over an order of magnitude. Author
- Geology, Geochemistry and Mineralogy