Conclusions
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1.
Cooling of compressed air in a heat exchanger by means of atmospheric air is sufficiently effective for drilling holes in frozen rocks with blowing.
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2.
The proposed method of cooling compressed air does not require considerable material expenditures and permits obtaining high-grade samples.
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3.
When drilling frozen soils having a moisture content greater than 10% a high-grade core can be obtained by means of a single-tube core barrel. In soils with a moisture content less than 10% a double-tube core barrel must be used.
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Literature cited
B. B. Kudryashov, “Normalization of the temperature regime of boreholes when drilling frozen ground with air cleaning of the bottom,” Zap. Leningr. Gos. Inst.,57, No. 2, Leningrad (1969).
V. I. Kovalenko, “Investigation of the temperature regime of a core of frozen ground,” Zap. Leningr. Gos. Inst.,66, No. 1, Leningrad (1973).
B. B. Kudryashov, V. I. Kovalenko, V. K. Chistyakov, et al., “Effective method of increasing the recovery and quality of a core in frozen ground,” Zap. Leningr. Gos. Inst.,57, No. 2, Leningrad (1969).
M. A. Gus'kov, “Boring core holes with compressed-air cleaning of the bottom under permafrost conditions,” Kolyma, No. 1 (1960).
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Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 2, pp. 19–20, March–April, 1978.
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Kovalenko, V.I. Effective method of drilling soil exploration boreholes in frozen ground. Soil Mech Found Eng 15, 119–121 (1978). https://doi.org/10.1007/BF02338861
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DOI: https://doi.org/10.1007/BF02338861