Determination of Stresses in the Snow Cover on a Mountain Slope by Snow Pressure Gauge

スポンサーリンク

概要

• 論文の詳細を見る

• Principal stresses in a snow cover on a slope with a uniform inclination and the shear viscosity of the snow of it were determined by measuring pressure in the snow, principal strain rates and plastic Poisson's ratio of the snow, using a linear constitutive equation for the snow as a plastic body on an assumption that the motion of the snow is two-dimensional in a vertical plane along the fall-line of the slope. A thin snow pressure gauge of the disk type was specially designed to measure pressure in a snow cover. It was 10cm or 18cm in diameter and 0.6cm in thickness; it had a protection fringe for the marginal pressure concentration and also had a built-in clinometer. Vertical snow pressure in a snow cover on a level ground measured by this pressure gauge showed a good agreement with the water equivalent of snow above the gauge. The value of snow pressure measured parallel to the contour line of the slope gave the 2nd principal stress σ_2 in the snow (named lateral stress, in this paper). Deformation of the configuration of hole-marks for two weeks was measured successively by the Hole-mark method. And for this period, principal strains ε_1 and ε_3 of the snow were calculated, followed by the calculation of principal strain rates ε^<.->_1 and ε^<.->_3 of the snow. Meanwhile, plastic Poisson's ratio υ of the snow was separately determined on the corresponding layer in the snow cover on a level ground by measuring the vertical and the horizontal snow pressure by two presure gauges. The average value of υ obtained was 0.10 for dry and fine grained compact snow of density ranging from 0.21 to 0.28 g/cm^3, while it was 0.15 constantly for dry compact snow of density in a range from 0.28 to 0.38 g/cm^3, regardless to temperature, stress invariant and change rate of stress invariant at least under the present experimental conditions.

• 北海道大学の論文
• 1987-03-30

著者

• 大泉 三津夫

  北海道大学大学院理学研究科

• 大泉 三津夫

  北海道大学低温科学研究所

関連論文

• 斜面積雪の歪速度と応力 VII
• 雪崩観測実験室実験斜面の雪質調査報告 XVII : 1984〜1985 (昭和59〜60) 年冬
• 斜面積雪の歪速度と応力 VI : 昭和58-59年冬
• 雪崩観測実験室実験斜面の雪質調査報告 XVI : 1983〜1984(昭和58〜59年)冬
• 雪崩観測実験室実験斜面の雪質調査報告 XV : 1982〜1983 (昭和57〜58年) 冬
• 雪崩観測実験室実験斜面の雪質調査報告 XIV (昭和56年〜57年冬)
• 斜面積雪の歪速度と応力 V. (昭和56〜57年冬)
• 斜面積雪の挙動の研究 XIX : 積雪の塑性ポアソン比3
• 斜面積雪の挙動の研究 XIV : 積雪の塑性ポアソン比2
• 斜面積雪の挙動の研究 XI : 積雪の塑性ポアソン比 1
• Determination of Stresses in the Snow Cover on a Mountain Slope by Snow Pressure Gauge

もっと見る 閉じる

スポンサーリンク