Time-Dependency of Mechanical Behavior of Frozen Shikotsu Welded Tuff

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  • 凍結した支笏溶結凝灰岩の力学的挙動の時間依存性
  • トウケツ シタ シコツ ヨウ ケツ ギョウカイガン ノ リキガクテキ キョドウ ノ ジカン イソンセイ

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Abstract

Understanding time-dependent deformation of frozen rock is significant for the assessment of long-term stability of rock slopes in cold region. In this study, to clarify the time-dependent deformation of frozen rock and influence of water content on the deformation, a series of uniaxial compression tests and creep tests were carried out on Shikotsu welded tuff under the dry and wet conditions at -20<tt>℃</tt> (-4<tt>°</tt>F). The uniaxial compressive strength (UCS) of frozen wet specimens was approximately equal to that of frozen dry specimens at the strain rate below 4.2<tt>×</tt>10-6/s. However, the former was greater than the latter at higher strain rates. The creep life of frozen wet specimens was longer than that of frozen dry specimens at the stress level above 13.4 MPa. On the other hand, the former was shorter than the latter at lower stress levels. Deformation of frozen wet specimens was larger than that of frozen dry specimens. The frozen dry and wet specimens showed different axial strain rate-axial creep strain curves. These differences could be explained by the presence of pore ice. Therefore, water content of rock should be considered for the assessment of long-term stability of rock slopes in cold region.

Journal

  • Journal of MMIJ

    Journal of MMIJ 129 (7), 433-439, 2013

    The Mining and Materials Processing Institute of Japan

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