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Artificially frozen ground and related engineering technology in Japan

Research in Cold and Arid Regions 2021年第2期13卷 77-86页

作者： satoshi Akagawa Cryosphere Engineering Laboratory TokyoJapan

Since the 1970's, frozen ground has been developing near the Tokyo Bay area around liquefied natural gas(LNG) inground storage tanks. For disaster prevention purposes, the tanks are constructed below the ground surface. Since the temperature of the liquid stored in the tanks is -162℃ the soil surrounding the tanks freezes. Since this frozen ground has existed for almost half a century, we have permafrost near Tokyo. The development of artificial frozen ground may cause frost heaving, resulting in frost heave forces that may cause structural damage of adjacent LNG in-ground storage tanks.Therefore, the demand for frozen ground engineering increased and consequently we now have advanced technology in this area. Fortunately, we use this engineering technology and artificial ground freezing for civil engineering, especially in big and crowded cities like Tokyo. This paper provides a summary of the testing apparatus, test methods, and assessment methods for frost heaving.

关键词： artificial ground freezing frost heave frozen ground engineering

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Frost heaving in ballast railway tracks

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Research in Cold and Arid Regions 2015年第5期7卷 632-636页

作者： satoshi Akagawa Michiaki Hori Cryosphere Engineering Laboratory Hokkaido Railway Campany

Frost heaving is a well-known phenomenon in cold regions, which may occur in wet clayey grounds during winter. Railway track upheaval occurring in cold regions during the winter is generally understood as frost heaving in the subgrade layer. However, it has been confirmed that upheaval due to frost heaving sometimes occurs in the ballast layer. This un- derstanding has been observed in active railways in northern Japan. The samples collected from ballast and subgrade layers have been examined for frost heave susceptibilities and confirmed that ballast layers which contain fines may heave.

关键词： frost heaving ballast layer subgrade layer railway track

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