Microwave Thawing of Frozen Soils and Gravels
Publication: Journal of Cold Regions Engineering
Volume 9, Issue 2
Abstract
Winter conditions in northern climates and permafrost regions make mining and excavation in frozen ground very difficult. Current methods of weakening frozen ground by thawing with combustible materials or electric heaters are slow and need improvement. Instantaneous volume heating is achieved by radiation heat transfer with microwave energy. The objective of this work by the U.S. Bureau of Mines was to determine the ability of microwaves to thaw frozen soil and gravel. The thawing rates and penetration depths as a function of soil types were experimentally determined at field test sites using a 6-kW microwave system operating at 2.45 GHz. Five types of soil were tested ranging from washed sand to clay with moisture levels from 7 pct to 44 pct. Field thawing tests were performed in Minnesota in winter, with ambient temperatures down to −23°C. The lowest specific energy obtained during field tests was 18 kWh/m 3 for a run of mine gravel.
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References
1.
Bakakin, V. P. (1959). Principles of geocryology. Part II: Engineering cryogeology. Ch. VII; Particular aspects of mining in thick permafrost . Acad. of Sci. of the U.S.S.R., Moscow, U.S.S.R., 219–230 (Minneapolis Translation No. 833).
2.
Bates, R. L., and Jackson, J. A., eds. (1987). Glossary of geology, 3rd Ed., Am. Geological Inst., Alexandria, Va.
3.
Delaney, A. J., and Arcone, S. A. (1982). “Laboratory measurements of soil electric properties between 0.1 and 5 GHz.”Rep. 82-10, U.S. Corps of Engrs., Cold Regions Res. and Engrg. Lab., Hanover, N.H.
4.
Epshteyn, Y. F., Arsh, E. I., and Vitort, G. K. (1960). New methods of crushing rocks . State Scientific Tech. Publishers, Moscow, U.S.S.R. (U. S. Dept. of Commerce translation, FTD-TT-62-122/1 + 2).
5.
Hamid, M.(1982). “Microwave thawing of frozen soil.”J. Microwave Power, 17(3), 167–174.
6.
Hoekstra, P. (1976). Rock, frozen soil and ice breakage by high frequency electromagnetic radiation . U.S. Army Corps of Engrs., Cold Regions Res. and Engrg. Lab., Hanover, N.H.
7.
Hoekstra, P., and Delaney, A. (1974). “Dielectric properties of soils at UHF and microwave frequencies.”J. Geophysical Res., 79(11).
8.
Merritt, F. S., ed. (1983). Standard handbook for civil engineers, 3rd Ed., McGraw-Hill Book Co., New York, N.Y.
9.
Sawyer, R. G., Boyko, L. L., and Hunt, G. M. (1973). “Microwave heating for road maintenance.”Rep., NTIS PB-229824, Syracuse Univ. Res. Corporation, Syracuse, N.Y.
10.
Sellmann, P. V. (1989). Strengths of soils and rocks at low temperatures . Cold Regions Sci. and Technol., Short Communications, Elsevier Science Publishers B.V., Amsterdam, The Netherlands, Vol. 17, 189–190.
11.
Sellman, P. V., and Brockett, B. E. (1992). “Digging frozen ground with a ripper bucket.”Spec. Rep. 92-15, U.S. Army Corps of Engrs., Cold Regions Res. and Engrg. Lab., Hanover, N.H.
12.
Skudrzyk, F. J. (1991). “Electric thawing as an alternative to disintegration of frozen granular materials.”Final Rep. to USBM MMRRI Programs, Univ. of Alaska-Fairbanks, Fairbanks, Alaska.
13.
Thuéry, J. (1992). Microwaves: industrial, scientific and medical applications, Artech House, Inc., Norwood, Mass., 215–216.
14.
von Hippel, A. R. (1954). Dielectric materials and application . John Wiley & Sons, Inc., New York, N.Y.
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Copyright © 1995 American Society of Civil Engineers.
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Published online: Jun 1, 1995
Published in print: Jun 1995
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