Call number:
ZSP-202-30
In:
Research report / Cold Regions Research and Engineering Laboratory, 30
Description / Table of Contents:
Summary: Deformations occurring in a tunnel, two trenches, and a 30 m deep pit excavated in the Greenland névé in the summer of 1954 have been measured over a period of 2 years. The experimental results indicate that closure rates increase with lateral distance from a restraining boundary up to distances of about 1 m. At larger distances, the effect of the boundary is not appreciable. Closure rates for deep excavations are not found to be strongly depth-dependent. This is due to a roughly parallel increase of viscosity and pressure with depth. Vertical compaction results from the pit agree well with those calculated from the depth-density relation using Sorge's Law. A theoretical calculation for the tunnel and pit closure, which is a modification of existing theories for the deformation of an elastic, compressible, thick-walled cylinder, is in fair agreement with the observed deformations. From this agreement it appears that the flow behavior of the névé can be described on the basis of a Newtonian viscosity. The trench closure is described as the-squeezing out of horizontal layers, fixed at some distance from the trench, and modified only slightly by the drag of neighboring layers. Measurements will be continued during future summers.
Type of Medium:
Series available for loan
Pages:
iv, 14 Seiten
,
Illustrationen
Series Statement:
Research report / Cold Regions Research and Engineering Laboratory 30
URL:
https://hdl.handle.net/11681/2693
Language:
English
Note:
CONTENTS
Preface
Summary
Introduction
Measurements and results
Tunnel
North-south trench
East-west trench
Deep pit
Theoretical development
Sorge's Law
Deformation of acylindrical tunnel in a viscous compressible medium
Discussion
Tunnel
Trenches
Deep pit
References
Appendix
Location:
AWI Archive
Branch Library:
AWI Library
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