Abstract
An understanding of the time dependent behaviour of rocks is becoming increasingly important for long-term stability or durability of underground structures. However, data on the time dependent behaviour of rocks such as creep in tension are very limited. The object of the present investigation was to clarify the creep behaviour of Sanjome andesite in uniaxial tension.Complete creep curves were successfully obtained, and experimental results were compared with previous results in uniaxial compression. The creep behaviour in uniaxial tension showed qualitatively similar trend to that in uniaxial compression. In primary creep region, the strain rate continuously decreases, followed by region where the strain rate changes little by little. Thereafter, the strain rate increases rapidly in tertiary creep region and is inversely proportional to the residual life time.Also it is found that the life time depends on the normalized differential stress, (σF-σC)/σF where σF and σC denote strength and creep stress, respectively; the specimen under the sanne (σF-σC)/σF has the same life time, irrespective of compression or tension.Finally, creep behaviour in uniaxial tension was analytically examined by the proposed mathematical model of crack growth. The result indicates that the model can be applicable to qualitative explanation of behaviour not only in primary creep region but also in tertiary creep region.
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