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Effect of a heated drilling bit and borehole liquid on thermoelastic stresses in an ice core
https://nipr.repo.nii.ac.jp/records/2236
https://nipr.repo.nii.ac.jp/records/2236562a57a9-2559-4c1e-9cee-1c968d9d8f0f
名前 / ファイル | ライセンス | アクション |
---|---|---|
KJ00000012789 (1.9 MB)
|
Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1994-03-01 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Effect of a heated drilling bit and borehole liquid on thermoelastic stresses in an ice core | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Nagornov,O. V.
× Nagornov,O. V.× Zagorodnov V. S.× Kelley,J. J. |
|||||
著者所属(英) | ||||||
en | ||||||
Moscow Engineering Physics Institute/Polar Ice Coring Office, University of Alaska Fairbanks/Polar Ice Coring Office, University of Alaska Fairbanks | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Thermal ice coring processes are accompanied by stresses in an ice core; micro-and macro-cracks are formed. Contamination under mechanical and thermal drilling usually penetrates from 5 to 30mm into the ice core. The quality of ice core acquired by thermal drilling depends on thermal stresses. To improve ice core quality, experimental and theoretical studies have been done. A prototype model of an antifreeze thermal electric drill (ATED) was tested. Temperature distribution in an ice core during thermal drilling was measured with thermocouples. To study temperature and stress distributions in an ice core, a mathematical model was developed. Impacts of ethanol-water solution (EWS) and kerosene on temperature and thermal stresses in an ice core were also studied. The experiments and model simulations have shown that thermal stresses in an ice core are proportional to the ratio of drilling bit length to penetration rate. The maximal thermal stresses in an ice core during thermal drilling exhibit only weak dependence on the type of borehole liquid. Forced circulation of the borehole liquid at the kerf leads to reduced depth of cracks by about 10mm. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00733561 | |||||
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue 巻 49, p. 314-326, 発行日 1994-03 |