Applicability of liquid air as novel cryogenic refrigerant for subsea tunnelling construction

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL
Youngjin Son, T. Ko, Dongseop Lee, Jongmuk Won, I. Lee, Hangseok Choi
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引用次数: 2

Abstract

The artificial ground freezing technique has been widely adopted in tunnel construction in order to impede heavy water flow and to reinforce weak sections during excavation. While liquid nitrogen is one of common cryogenic refrigerants particularly for rapid freezing, it has a serious potential risk of suffocation due to an abrupt increase in nitrogen content in the atmosphere after being vaporized. This paper introduces a novel cryogenic refrigerant, liquid air, and addresses the applicability of it by performing a series of laboratory chamber experiments. The key parameters for the application of artificial freezing using liquid air in subsea tunnel construction are freezing time and energy consumption, which were evaluated and discussed in this paper. The comparative study of these parameters between the use of liquid air and liquid nitrogen demonstrates that liquid air with no risk of suffocation can be a potential substitute for liquid nitrogen delivering the equivalent performance. In addition, the theoretical model was adopted to evaluate the chamber experiments in an effort to estimate the freezing time and the energy consumption ratio (energy consumption for maintaining the frozen state to the energy consumption for freezing soil specimens).
液态空气作为新型低温制冷剂在海底隧道施工中的适用性
人工冻结技术在隧道施工中被广泛采用,以阻止大水流和加固开挖中的薄弱路段。液氮是一种常见的低温制冷剂,尤其适用于快速冷冻,但液氮汽化后大气中氮含量突然增加,存在严重的窒息风险。本文介绍了一种新型的低温制冷剂——液态空气,并通过一系列的室内实验说明了它的适用性。液态空气人工冻结在海底隧道施工中应用的关键参数是冻结时间和能耗,本文对其进行了评价和讨论。通过对使用液态空气和液氮时这些参数的比较研究表明,没有窒息风险的液态空气可以作为液氮的潜在替代品,提供同等的性能。此外,采用理论模型对室内试验进行评价,估算冻结时间和能量消耗比(维持冻结状态的能量与冻结土样的能量消耗之比)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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