The tunnel shield tunneling entrance and exit freezing project frequently utilizes a circular freezing design.To investigate the impact of key parameters,such as thermal conductivity and initial ground temperature,on the temperature field of the circular freezing process,a two-dimensional re-fined numerical calculation model was developed based on the governing equations for the freezing temperature field.This was followed by comprehensive numerical simulation studies.The duration re-quired to complete a freeze cycle decreases with an increase in soil thermal conductivity;conversely,it extends linearly with rising ground temperatures.Under the conditions of this experiment,for every 10℃ increase in ground temperature,the freeze cycle time is extended by approximately 3.5 days.The findings from this research provide valuable insights for considerations related to freezing design.
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