Abstract
The results are given of a study of the changes of strength, deformation characteristics, and other physical properties that were measured in heated, moist rock specimens. These values are then used and the results of theoretical analyses for the temperature and thermal stress distributions around openings are described. The stability of openings containing heated water is discussed. The properties of granite and andesite at elevated temperatures determined in laboratory experiments are described, and an analysis method suitable for the analysis of the stability of openings used for storage of heated water and low temperature liquids is discussed in its application to heated water storage. It was found that the compressive and tensile strength of granite and andesite at room temperature are lower when the rock is in a wet condition than in a dry condition. These and other findings are presented and discussed.
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