饱和砂层渗流作用下液氮快速冻结温度场研究
[Abstract]:Salt water freezing is one of the methods to stop water and reinforce the formation, but the freezing wall develops slowly or even does not cross the circle when the saturated sand layer with groundwater flow is frozen, and liquid nitrogen freezing can solve the problem of groundwater flow quickly. In this paper, the artificial freezing process of saturated sand percolation formation is often used in municipal engineering. The development of liquid nitrogen freezing temperature field under seepage is studied systematically by numerical simulation and physical test. Considering the inhomogeneity of liquid nitrogen temperature, the temperature distribution of pipe wall was studied by numerical simulation, and the Comsol calculation model was established according to the actual situation. The coupling of seepage field and temperature field is realized by partial differential equation. The development law of liquid nitrogen freezing temperature field under the action of groundwater flow with different velocity of flow and tube wall temperature is obtained by single pipe calculation, and the freezing law of four freezing tubes under seepage is obtained through the analysis of typical parameters. The effects of the flow velocity of groundwater, the spacing of freezing tubes, the temperature of pipe wall and the temperature of water flow on the freezing temperature field were studied by single factor analysis, and the effects of these factors on the temperature field and intersecting time of liquid nitrogen freezing seepage were studied by orthogonal test. According to the similarity criterion, physical experiments were carried out to obtain the temperature variation of each measuring point, and the variation law of freezing wall thickness was obtained according to the temperature of the measuring point. According to the measured wall temperature in the experiment, the tube wall temperature is reduced to the prototype by similarity criterion, and the results are compared with the physical test to verify the reliability of the numerical simulation.
【学位授予单位】:中国矿业大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TU99
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