On a New Method to Measure the Shearing Strength of Snow by Means of a Cooling Box
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概要
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The author researched a method to measure the shearing strength of fallen snow by means of pulling out a cooling box which is frozen to the snow sample.<BR>At first, we take out two bocks from a snow layer, and between them hold a flat box which is called "cooling box" by the author. When we next put a freezing mixture (composed of salt and snow) in the box, the both outer surfaces of the box freeze to the snow brocks. Next, keeping down the snow brocks by a plate in which a hole of a suitable size is made, we pull out the box through the hole. Then the snow brocks break down in such a state that the fractions of the snow brocks are fixed with a homogeneous thickness on the both outer surfaces of the cooling box. Then the pulling force divided by the area of the sections cut off from the snow brocks is the shearing strength of the snow sample. In the measurement as above mentioned there is no such a compression as arises in the measurement by the usual shearing apparatus which is composed of three strata. The results measured by this method for the various layers in a deeply deposited snow were shown. The effects of the size of the hole in the plate which is used for keeping down the snow brocks on the force required to pull out the cooling box, the effects of cooling on the mechanical properties of the snow surface to be broken and the stress distribution in the snow sample under the pulling force were respectively researched both theoretically and experimentally, and it was made sure that our new method as above mentioned give ous satisfactory results as a method to measure the shearing strength of snow.
- 社団法人 日本雪氷学会の論文