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为了研究煤矿立井冻结壁温度场发展规律,采用COMSOL Multiphysics多物理场耦合程序,建立了立井冻结壁有限元分析模型,该模型考虑了冻结过程中相变潜热因素影响,模型与工程实际更为吻合。为验证模型的准确性,以某矿风井为研究对象,进行了170 d的冻结过程模拟,并与实测数据进行了对比分析,模拟结果与实测吻合度较好。依据模拟结果,可得出:1冻结过程中,测温孔温度呈负指数型下降,最终趋于恒定值;2冻结壁厚度初期增长幅度较大,而进入156 d增长趋势趋缓,最终趋于稳定,厚度达到8.2 m;3主面温度曲线以冻结管位置为中心呈V型发展,界面温度曲线则近似呈弧形发展。本模拟方法为冻结壁温度场研究提供了一种新的分析手段,相应研究成果对冻结法凿井准确把握井壁温度场演化具有较好参考价值。
In order to study the development law of the temperature field of frozen wall in coal mine shaft, finite element analysis model of vertical well freezing wall was established by COMSOL Multiphysics multi-physics coupling program. The model considers the influence of latent heat of phase change in freezing process. . In order to verify the accuracy of the model, taking a mine shaft as a research object, a 170-day freezing process simulation was carried out and compared with the measured data. The simulation results were in good agreement with the measured ones. Based on the simulation results, it can be concluded that during the freezing process, the temperature of the temperature-measuring well decreased negative exponentially and eventually reached a constant value. 2 The initial increase of the frozen wall thickness was larger, The thickness of the main surface reaches 8.2 m. 3 The temperature curve of the main surface is V-shaped with the position of the frozen pipe. The curve of the interface temperature is approximately arc-shaped. The simulation method provides a new analytical method for the study of frozen wall temperature field. The corresponding research results have a good reference value for the freezing shaft method to accurately grasp the temperature field evolution of the shaft wall.