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(사)한국터널지하공간학회

ISSN : 2233-8292

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Vol.16 No.5

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Studies of application of artificial ground freezing for a subsea tunnel under high water pressure - Focused on case histories-

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2014, v.16 no.5, pp.431-443



& (2014). Studies of application of artificial ground freezing for a subsea tunnel under high water pressure - Focused on case histories-. (사)한국터널지하공간학회, 16(5), 431-443.

Abstract

In this paper case studies of artificial ground freezing, which have not been applied in Korea, have been investigated for the water cut-off in a subsea tunnel under high water pressure and the most commonly used cooling mediums of brine and liquid nitrogen are examined. Since sea water with pressure has the lower freezing point than pure water, the lower temperature cooling medium is required in the application of subsea tunnel. Also, the cooling medium must have refrigeration safety and is able to reduce executing time. Brine freezing system can reuse cooling medium and is safer than liquid nitrogen freezing. But it takes more time to freeze ground and needs complex circulation plants. On the other hand, liquid nitrogen freezing system can’t recycle cooling medium and may cause breathingproblemsorasphyxiationthroughoxygendeficiency. But, freezing with liquid nitrogen is fast and requires simple refrigeration equipment. Principal elements of design for ground freezing in subsea tunnel have been extracted and these elements are needed further research

keywords
동결공법, 해저터널, 연결구, 막장면, 고수압, 브라인, 액체질소, Artificial ground freezing, Subsea tunnel, Cross-passage, face, high water pressure, brine, liquid nitrogen LN2

Reference

1.

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7. Pimentel, E., Papakonstantinou, S., Anagnostou, G. (2012), “Numerical interpretation of temperature distributions from three ground freezing applications in urban tunneling”, Tunnelling and Underground Space Technology, Vol. 28, pp. 57-69.

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