通过实地试验评估液氮在人工地面冷冻中的再利用情况

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Acta Geotechnica Pub Date : 2024-09-18 DOI:10.1007/s11440-024-02388-8
Hyun-Jun Choi, Seokjae Lee, Hyobum Lee, Sangyeong Park, Hangseok Choi, Jongmuk Won
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引用次数: 0

摘要

液氮是人工地面冻结法(AGF)中最常用的制冷剂,用于快速冻结土壤。然而,由于液氮的价格相对较高,因此需要在 AGF 中重复使用液氮,即在初次注入后利用部分气化的液氮。本研究通过现场实验研究了液氮在 AGF 中的重复使用性。在距离主冷冻管道 1 米远的次冷冻管道附近对地面温度进行了监测,液氮最初就是注入次冷冻管道的。向主冻结管道注入液氮 5 天后,两根副冻结管道之间形成了厚度为 1 米的冻结墙。此外,在副冻结管道中测得的最低温度为零下 12 °C,这意味着氮气在主冻结管道中循环后的温度足够低,足以冻结周围的土壤层。根据监测温度数据评估的冻结速度、冻结时间和冻结持续时间也证明了在饱和淤泥沉积物 AGF 中重复使用液氮的巨大潜力。
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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Assessing the reuse of liquid nitrogen in artificial ground freezing through field experiments

Liquid nitrogen is the most common refrigerant adopted in the artificial ground freezing (AGF) method for the rapid freezing of soil. However, the relatively high price of liquid nitrogen demands the reuse of liquid nitrogen in AGF, which utilizes partially gasified liquid nitrogen after an initial injection. This study investigated the reusability of liquid nitrogen in AGF by performing a field experiment. Temperatures of the ground were monitored near the sub-freezing pipes installed 1 m away from the main freezing pipes, where liquid nitrogen was initially injected. A frozen wall having a thickness of 1 m was formed between two sub-freezing pipes after 5 days of injecting liquid nitrogen into the main freezing pipes. Furthermore, the lowest temperature of  − 12 °C measured in the sub-freezing pipe implied that the temperature of nitrogen after circulating through the main freezing pipe was sufficiently low to freeze the surrounding soil formation. The freezing rate, elapsed time for freezing, and freezing duration evaluated from the monitored temperature data also demonstrated the promising potential of reusing liquid nitrogen in AGF for saturated silty deposits.

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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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