关键词: 冻结壁, 温度场, 纵向测温, 薄弱点定位

Abstract: The study of artificial formation freezing temperature field is a necessary method to grasp the development status of frozen wall. Usually, the measured data of the local temperature measurement hole is used to estimate the effective freezing radius of the frozen soil column, and then the frozen wall intersection time is predicted, but this method is prone to blind area of local frozen wall monitoring. In order to accurately determine the overall closure of the frozen wall, the transient mathematical calculation model of the single-hole frozen soil column after a short-term cooling stop was established by longitudinal temperature measurement of the freezing apparatuses, and the complex formula was digitized with the help of Maple mathematical calculation software, and the relationship between the radius of the frozen soil column and the return temperature of the brine and the freezing interruption time was revealed. Finally, taking the Xipang air shaft in Dongpang Mine of China as an engineering case, through the calculation and analysis of the longitudinal temperature data in each freezing apparatus, the weak position of the freezing wall is determined, which provides a theoretical basis for the treatment of the frozen wall effluent accident.