关键词: 人工地层冻结, 局部冻结, 温度场, 单管冻结, 发泡材料

Abstract: Technology of partial insulation can solve challenging problems when freeze sinking method is applied into the deep shaft sinking project, and it can also save a large amount of cold energy. The partial insulation freezing temperature field of single pipe has been used as research object, in order to obtain the effect law of heat preservation material characteristics on the temperature field. Firstly, combined with the method of similarity theory and theoretical research, the dimensionless mathematical model and criterion of corresponding expression which attributed to the single pipe freezing temperature field have been derived. Secondly, combined with numerical calculation and simulation test, single pipe partial freezing problems have been studied under the condition of foam material freezing pipe, with the dimensionless criteria being used as influencing factors. The relationships between freezing-pipe dimensionless heat flux and specific heat，conductive coefficient，outer radius of insulating material have been obtained. The optimum selection range of conductive coefficient should be no greater than 0.035 (dimensionless), and the outer radius of insulating material should be at 1.4~1.6 (dimensionless). The conclusion can be widely applied to frozen engineering fields. It provides a theoretical foundation and convenient conditions for the design and application in the freeze sinking projects.

Key words: artificial ground freezing, partial freezing, temperature field, single pipe freezing, foam material