大谷石のクリープ特性とクリープ過程について

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タイトル別名
  • Creep Behaviour and Creep Process of 'Ohya-stone'.
  • オオヤイシ ノ クリープ トクセイ ト クリープ カテイ ニ ツイテ

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抄録

A reliable method has been required for the estimation of mechanical properties of rock and for observation of the stability of rock-structure. In this study, drained creep tests under uniaxial compressive load were carried out with the aim of estimating the long-term stability of ‘Ohya-stone’(porous tuff, in Japan). In these experiments, axial and lateral strains were measured and Acous-tic Emission (AE) activities were monitored, at the same time. The loading times maintained in these creep tests varied between several minuets to one month.<BR>Some general observations made are: 1) The creep stress in any case of failure must exceed 70% of the uniaxial compressive strength, which corresponds to the yielding stress of the rock. 2) The minimum value of volumetric strain for this rock type in creep process is nearly constant in each sample. 3) The relationship between the point of minimum strain rate and that elapsed time in log-log plotting becomes a straight line which slope is-1. 4) The strain rate in the secondary creep region is almost in constant and the creep time in this region occupies over 90% of entire test intervals. 5) Therefore, it has high possibility that failure of rock will occur when the amount of strain in creep region reaches a constant value in each sample. 6) The AE activity noted to develop during the creep process is more active only for a short period in the tertiary creep region. And, to apply AE monitoring for prediction of failure of rock-structure, the mechanism of AE activity information must be clarified in more detail.<BR>Including the discussion of mechanism of AE activity in the secondary creep region, further experiments are to be conducted in our laboratory.<BR>However, a practical method for estimating the long-term stability of rock below the yielding point load range of the rock, as a substitute for creep test, must be developed.

収録刊行物

  • 資源と素材

    資源と素材 110 (11), 875-882, 1994

    一般社団法人 資源・素材学会

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