Heat transfer analysis in artificial ground freezing for subway cross passage under seepage flow

Liu X.; Shen Y.; Liu Y.Han Y.Nowamooz H.An Y.

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Heat transfer analysis in artificial ground freezing for subway cross passage under seepage flow

机译：Heat transfer analysis in artificial ground freezing for subway cross passage under seepage flow

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? 2022 Elsevier LtdArtificial ground freezing is an environmentally friendly and reliable method for ground improvement during subway cross passage construction under variable hydrological conditions. However, natural or induced seepage flow influences significantly the closure of frozen wall, as it supplies a substantial source of heat. In this study, a physical model test was conducted based on the freezing project of a subway cross passage in Beijing Subway Line 19. A series of thermistors were installed in some representative locations to measure the temperature distribution and further calculate power demand. Besides, a hydro-thermal coupling model of freezing process under seepage conditions was derived to consider the variations of physical and thermodynamic parameters of the porous media and the latent heat of ice/water phase transition. The numerical approach was validated by the experimental results. Furthermore, four crucial indicators affecting the closure time during AGF process were quantitatively evaluated. The results showed that the closure time at seepage velocities of 0, 25.6 and 51.2 m/d were respectively 60, 110 and 441 min. Nevertheless, it was impossible to form continuous frozen bodies at 76.8 m/d. Among these indicators, the seepage velocity had the greatest effect on the thickness and shape of frozen body, while seepage temperature had the least impact.

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《Tunnelling and underground space technology》 |2023年第3期|104943.1-104943.16|共16页
作者
Liu X.; Shen Y.; Liu Y.Han Y.Nowamooz H.An Y.;
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作者单位

School of Civil Engineering Beijing Jiaotong University||ICUBE UMR 7357 CNRS INSA de Strasbourg;

School of Civil Engineering Beijing Jiaotong University;

ICUBE UMR 7357 CNRS INSA de StrasbourgGansu Province Transportation Planning Survey and Design Institute Co. Ltd;

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正文语种英语
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关键词
Artificial ground freezing; Hydro-thermal coupling model; Physical model test; Seepage flow; Subway cross passage;

Heat transfer analysis in artificial ground freezing for subway cross passage under seepage flow

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