Abstract:

Some strata are difficult to be frozen for its thermal properties or water environment in some shaft construction projects by using artificial freezing method. A freezing suggestion of flowing two types of negative temperature solutions in a freezing pipe is proposed to intensify freezing. To verify the effect of such freezing method, single freezing pipe tests are conducted in a model test box using two sets of circulatory systems to provide calcium chloride solution of different negative temperatures. Three dimensional numerical analysis of intensified freezing is calculated by using FVM method. The intensified freezing section of freezing pipe has a boundary condition of different temperature, -35℃,-40℃ and -45℃. The mesh model is calculated to analyze temperature field distribution laws and characteristics of frozen wall in different level of freezing pipe. The results show that the difference of temperature can be realized between adjacent outer walls of the two different temperature sections of a freezing pipe. Such two different temperature freezing method can increase thickness, reduce average temperature and intensify cold energy dissipation.

Key words: freezing pipe, artificial freezing, temperature field, intensified freezing, cold energy dissipation, finite volume method