首页|Field experiments for three freezing operation scenarios in silty soil deposits
Field experiments for three freezing operation scenarios in silty soil deposits
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NSTL
Elsevier
? 2022 Elsevier B.V.Artificial ground freezing methods have been widely used in many engineering applications to change the mechanical and hydraulic properties of soil. Two freezing methods, open and closed systems, have been commonly utilized depending on the target freezing rate and budget of the project. In this study, a novel freezing pipe was designed, which enables the frozen soil to be formed in an elliptical shape to satisfy special construction demands such as tunneling projects. Temperature evolution of silty deposit in open and closed system were assessed respectively by injecting liquid nitrogen and circulating ethanol. In addition, the efficiency of hybrid freezing operation (open+closed system) in a silty deposit was investigated by injecting liquid nitrogen (open system) followed by the circulation of ethanol (closed system). The elapsed time for freezing and the freezing duration is also evaluated from the measured temperature data at distances of 25, 50 and 75 cm from the freezing pipe. The results show that the designed freezing pipe enabled forming a frozen soil in an elliptical shape. In addition, the hybrid freezing operation is an effective method for forming and sustaining a relatively large volume of frozen soil without continuously injecting liquid nitrogen.
Artificial ground freezingEthanolFreezing durationLiquid nitrogenOpen and closed systemSilty soil
Won J.、Lee D.、Choi H.-J.、Lee H.、Choi H.
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Department of Civil and Environmental Engineering University of Ulsan
Steel Structure Research Group POSCO
Northern Infrastructure Specialized Team Korea Institute of Civil Engineering and Building Technology
Advanced Railroad Civil Engineering Division Korea Railroad Research Institute
School of Civil Environmental and Architectural Engineering Korea University
NSTL
Elsevier
