Experimental and Numerical Study on Hydro-thermal Behaviour of Artificial Freezing System with Water Flow

Hyunwoo Jin; Jangguen Lee; Byung Hyun Ryu; Gyu-Hyun Go

doi:10.7843/kgs.2020.36.12.17

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2020 Vol.36, Issue 12 Preview Page Next Page

Research Article

Experimental and Numerical Study on Hydro-thermal Behaviour of Artificial Freezing System with Water Flow 물의 흐름을 고려한 인공동결 시스템의 열-수리 거동 연구

31 December 2020. pp. 17-25

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Abstract

The artificial ground freezing method is a ground amelioration technology that does not have a permanent effect on the ground. One of the key factors that determine the efficiency and design criteria of the artificial ground freezing is the groundwater flow. Therefore, in order to accurately evaluate the behavior of the artificial ground freezing, studies on the effect of water flow on the formation of ice walls must be preceded. In this paper, experimental and numerical analyses were conducted using only pure water to maximize the effect of water flow on the formation of ice walls. A hydro-thermal coupled model for freezing behavior was proposed and the accuracy of the model was verified. Through the numerical and experimental studies, the flow rate dominates not only the formation time but also the shape of the ice wall. In addition, this study proposes a method to indirectly predict the ice wall formation time, which is expected to be highly useful for a practical application where it is difficult to visually identify ice walls.

Keywords

Artificial ground freezing

Experiment

Groundwater flow

Ice wall

Numerical analysis

인공동결 공법은 지반에 영구적인 영향을 초래하지 않는 지반개량 공법으로 인공동결 공법의 효율성 및 설계기준을 결정하는 핵심인자는 물의 흐름이다. 따라서 인공동결 공법을 적용하기 위해서는 동결구근 및 벽체 형성에 물의 흐름이 미치는 영향에 대한 연구가 선행되어야 한다. 본 논문에서는 물의 흐름이 동결구근 및 벽체 형성에 미치는 영향을 극대화하기 위해 순수한 물을 활용한 실내실험과 수치해석 연구를 수행하였다. 열-수리 연계 해석모델을 새롭게 제안하고 이를 실험적으로 검증하였으며, 유량이 동결벽체 형성 시간 및 형상을 결정짓는 핵심인자임을 확인하였다. 나아가, 동결구근 및 벽체를 가시적으로 확인하기 어려운 지반에서 활용성이 높을 것으로 예상되는 동결벽체 형성 시간을 간접적으로 예측할 수 있는 방안을 새롭게 제시하였다.

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Information

Publisher :The Korean Geotechnical Society
Publisher(Ko) :한국지반공학회
Journal Title :Journal of the Korean Geotechnical Society
Journal Title(Ko) :한국지반공학회 논문집
Volume : 36
No :12
Pages :17-25
Received Date : 2020-08-24
Revised Date : 2020-09-15
Accepted Date : 2020-09-15
DOI :https://doi.org/10.7843/kgs.2020.36.12.17

Journal of the Korean Geotechnical Society ISSN:1229-2427(Print) 2288-646X(Online) 한국지반공학회 논문집

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