In order to explore the development law of freezing temperature field in the main inclined shaft of Shengfu Mine and predict the excavation time of open-cut section,COMSOL Multiphysics® simulation software was used to analyze the development of soil temperature field at different levels of open-cut section based on the theory of actual hole formation position of freezing pipe and heat transfer,combined with the soil thermal physics parameters.The results showed that in the early freezing period,the temperature of the middle sand layer dropped faster and the time of freezing wall crossing was earlier than that of the fine sand layer;in the middle period of freezing,the development of the freezing wall of the middle sand layer was better than that of the fine sand layer,but the difference of the freezing index between the two decreased gradually in the later period;after 60 d of freezing,the effective thickness and average temperature of the freezing wall of the side and bottom plate met the design requirements;in order to control the freezing cost,the shaft construction can be excavated after 60 d.
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