关键词: 冻结调控, 等效冻结时间, 动态分析方法

Abstract: The accurate prediction and control technology of the formation characteristics of the freezing wall is one of the major technical problems in the deep shaft freezing sinking. The freezing process of deep alluvium in the West Ventilating Shaft of Zhaogu No.2 Coal Mine is more complicated. In order to realize the accurate prediction and control of the formation characteristics of the freezing wall and guide the construction of freezing and excavation scientifically, the comprehensive analysis method of the formation characteristics of the freezing wall is put forward, which can be transformed into a dynamic analysis method by refining and decomposing the state factors of daily salt water movement. The new concept of equivalent freezing time is introduced to keep the fast subsection calculation of comprehensive analysis method. Through the continuous analysis and adjustment of the application of the equivalent freezing time, the analysis results of the formation characteristics of the freezing wall with complex regulation are closer to the engineering practice. The application shows that the deviation between the implemented and designed effective thickness of the freezing wall is less than 2%, the deviation between the implemented and designed effective average temperature of the freezing wall is less than 1 °C, and the deviation between the implemented and designed shaft sidewall temperature is less than 2 °C. The dynamic comprehensive analysis method of the formation characteristics of the freezing wall can accurately implement the freezing control and meet the requirements of rapid construction. It provides a successful experience for the accurate prediction and control of the formation characteristics of the freezing wall of the deep alluvium in China.