Call number:
ZSP-202-273
In:
Research report
Description / Table of Contents:
CONTENTS: Introduction. - Background. - Physical characteristics of snow. - Mechanical behavior of snow. - Failure mechanism of snow. - Description of experimental work. - Method. - Preparation of test samples. - Test apparatus and equipment. - Procedure. - Results and discussion. - Mechanical properties of test samples. - Experimental results. - Summary, conclusions, and recommendations. - Literature cited. - Selected bibliography. - Appendix A. Development of theoretical equations. - Appendix B. Test data and calculations. - Appendix C. Selected, representative photographs. - Appendix D. Schedule of tests performed. - Abstract.
Description / Table of Contents:
This report presents the results of a study performed on the behavior, particularly the deformation, of snow under a load applied to a rigid plate at a constant rate of penetration. The results will eventually be used in the development of design criteria for snow roads, runways, and foundations in the polar regions. The tests were conducted on snow samples having a high width/length ratio, simulating a two-dimensional case. The effect of snow density, plate size, and pressure on the deformation of snow below the load was investigated. The pressure-sinkage relationships and the bearing strength as functions of density were also investigated. It was determined that density, in the range 0.3 to 0.6 g/cm^3, can be used as a reasonably reliable index for predicting deformation and behavior of snow under load. In general, the critical pressure (bearing strength) increased as a power function of density, and critical sinkage decreased as a power function of density. It was also observed that the deformation bulb resembled the typical Boussinesq stress bulb. The experimental pressure-sinkage relationships agreed closely with recently developed theoretical values. For the range of plate sizes used, the test data did not provide conclusive evidence of the effect of plate size on deformation and bearing capacity of snow. The possibility of using the Moire fringe method for determing deformation patterns in snow and soils under various loading conditions should be investigated.
Type of Medium:
Series available for loan
Pages:
iv, 67 Seiten
,
Illustrationen
Series Statement:
Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 273
URL:
http://www.worldcat.org/oclc/1035633972
Language:
English
Branch Library:
AWI Library
