Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)
Online ISSN : 2185-6516
ISSN-L : 2185-6516
Paper (In Japanese)
FREEZING AND THAWING TESTS FOR ESTIMATING ROCK STRENGTH REDUCTIONS IN RELATION TO ROCK PHYSICAL PROPERTIES
Yuki KUSAKABEYoshihiko ITO
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2015 Volume 71 Issue 1 Pages 47-54

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Abstract

 To establish a quantitative evaluation method of rock deterioration by repeated freezing and thawing, the authors studied evaluation method of the rock deterioration from initial strength or other mechanical properties of rock. As a result, we found linear negative correlation between the logarithm of reduction ratio of unconfined compression strength of rock and the square root of number (N) of freeze-thaw cycle ( √N approximation). To estimate rock deterioration safely, we constructed an approximation method by applying √N and exponential approximation. We also found that constant obtained by regression analysis with √N and exponential approximation and boundary number of freeze-thaw cycles of the both had high correlations with dynamic modulus of elasticity of rock. These findings can be used for evaluating the deterioration degree of rock strength quantitatively in relation to the specific number of freeze-thaw cycles that rock may undergo.

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© 2015 by Japan Society of Civil Engineers
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