基于冻结器内纵向测温的冻结壁薄弱点精准定位技术

人工地层冻结温度场研究是掌握冻结壁发育状况的必要手段，通常以测温孔的实测数据来推算冻土圆柱的有效冻结半径，进而预测冻结壁交圈时间，但该方法易出现局部冻结壁监测盲区。为准确判断冻结壁整体闭合情况，通过对冻结器进行纵向测温，建立了短时停冻后的单孔冻土柱瞬态数学计算模型，借助Maple数学计算软件将复杂公式数字化，揭示了冻土柱半径与回路盐水温度、停冻时间的关系。最后以中国东庞矿西庞风井作为工程案例，通过对各个冻结器内纵向温度数据的计算分析，确定了冻结壁的薄弱位置，为冻结壁“窗口”出水事故的处理提供了理论依据。

Technology for Precise Positioning of Weak Point of Freezing Wall by Longitudinal Temperature Measurement

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.