UID:
kobvindex_GFZ20201209142021
Format:
vi, 32 Seiten
,
Illustrationen
Series Statement:
Research report / Cold Regions Research and Engineering Laboratory 89
Content:
Abstract: Experiments were carried out near Thule, Greenland, on the correlation between the physical properties and internal structure of snow. About 150 snow samples obtained to 26 m depth were measured for elastic modulus, air permeability, unconfined compressive strength, static compression and creep. The observed density profile curve deviated from the theoretical curve at a depth of 10 m. and density of 0.52 g/cm^3, a value almost equivalent to the limiting density obtainable by simple mechanical packing. Therefore, further densification must proceed through plastic flow in grains. A similar critical depth was observed in the vertical distribution of Young's modulus. A positive correlation was found between Young's modulus and density, and an inverse correlation between average grain diameter and Young's modulus or density. There were reciprocal correlations between air permeability and density or unconfined compressive strength, and between the number of grains and their average diameters. Kozeny's constant of Greenland snow was obtained from air permeability values and the length of peripheries of cross sections of grains. To demonstrate the change of internal structure of snow due to densification, static compression tests of snow cylinders were conducted, and thin sections of snow texture were compared before and after compression. Creep curves of snow cylinders were analyzed using Nutting's formula and are discussed in connection with change of internal structure. Basal slip, buckling, cell or sub-grain formation, recrystallization and grain boundary migration occurring during plastic deformation of snow texture were observed by static compression of thin section snow under the microscope.
Note:
CONTENTS
Preface
Nomenclature
Introduction
Experimental methods
Density profile and densification
Internal structure in typical samples
Average grain size obtained from thin section
Two-dimensional porosity, total pore periphery and tortuosity
Vertical distribution of Young's modulus
Air permeability and its structlU'al dependence
Porosity dependence
Grain size dependence
Kozeny's constant for Greenland snow
Correlation between air permeability and tortuosity of grains
Unconfined compressive strength
Static compression and creep in snow under high stresses
Microscopic observation of the change in snow textlU'e under compression
Literature cited
Abstract
In:
Research report / Cold Regions Research and Engineering Laboratory, 89
Language:
English
Keywords:
Forschungsbericht
URL:
https://hdl.handle.net/11681/5874
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