アイスドームの定常クリープ変位算定式

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  • Simplified formula for stationary creep deflection of ice dome
  • アイス ドーム ノ テイジョウ クリープ ヘンイ サンテイシキ

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Based on field experiments on ice domes spanning 1030m carried out in the past, the creep deflection-time curve is approximately given by connecting two lines; one line belongs to the stationary stage in which the deflection is initially a linear function of time and the other line belongs to the accelerating stage in which the deflection rate increases with time up to failure. This paper proposes a simplified formula for computing the creep deflection at the stationary stage. The derivation of the formula is as follows: Assuming ice to be a Newtonian fluid and using the invariant theory for the creep material and the membrane theory for a thin shell, the vertical deflection on the top is derived analytically. The evaluation of the viscosity of the ice is based on the creep deflection obtained from the field experiments on ice domes. As a result, the average viscosity is computed to be approximately 3500 kgf cm-2 day. In particular, the simplified formula satisfactorily predicts the creep deformation of ice domes when the ice temperature is in the range of 0 to-5°C.

収録刊行物

  • 雪氷

    雪氷 69 (4), 519-530, 2007

    公益社団法人 日本雪氷学会

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