基于冻结器内纵向测温的冻结壁薄弱点精准定位技术

Longitudinal temperature measurement for precise positioning of weak point of frozen wall

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。

It’s necessary to study the temperature field in artificial formation freezing,to grasp the development status of frozen wal l.Usually,the measured data of the local temperature measurement hole is used to estimate the effective freezing radius of thefr ozen soil column,and then the frozen wall intersection time is predicted,but this method is prone to have blind area of localfrozen wall monitoring.In order to accurately determine the overall closure of the frozen wall,the transient mathematical calculationmodel of the single-hole frozen soil column after a short-term cooling stop is established y longitudinal temperature mea surement of the freezing apparatuses,and the complex formula was digitized with Maple bmathematical calculation software,andthe relationship between the radiu s of the frozen soil column and the return temperature of the brine and the freezing inte rruption time is revealed.Finally,taking the engineering case of Xipang air shaft in Dongpang Mine,through calculating andan alyzing the longitudinal temperature data in each freezing apparatus,the weak position of the frozen wall is determined,whichprovides a theoretical basis for the treatment of the frozen wall effluent accident.