斜井液氮补强冻结温度场分布特征

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Abstract The brine curtain freezing cannot form a closed frozen wall in inclined shaft because of flowing water in the ground may take away some cold energy. The method of liquid nitrogen freezing was used to strengthen the brine curtain freezing. Conclusion are drawn through analysis of soil temperature distribution data which was gained in the process of freezing construction. Firstly，mixed states of nitrogen gas and liquid nitrogen appeared in freezing pipe when the pipe export temperature is lower than －100 ℃. Opening holes on the liquid nitrogen supplying tube can affect the distribution of liquid nitrogen. As a result it may affect the freezing effect. Secondly，due to flowing water may take away some cold energy；the difference in the expansion speed of frozen soils is larger between pre and post the time that the closed frozen curtain was formed. And the flowing water can affect the temperature distribution of frozen wall. Thirdly，the frozen wall with high temperature gradient were uneven because of the low gasification temperature of liquid nitrogen. The termination of liquid nitrogen supply reduces the temperature gradient in the frozen wall. The soil temperature near the freezing hole rises faster than far away from the freezing hole after the freezing stopped. The research results indicate that the reinforcement freezing can effectively block flowing water by mean of the frozen wall formed by liquid nitrogen freezing. The problem can be solved that the closed curtain cannot be formed using brine curtain freezing.

Key words： underground engineering inclined shaft curtain freezing liquid nitrogen freezing reinforcement freezing flowing water temperature distribution

Received: 14 May 2013

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http://www.rockmech.org/EN/Y2014/V33/I3/567

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