NUMERICAL ANALYSIS OF TEMPERATURE FIELD OF CONICAL FREEZING WALL UNDER SEEPAGE CONDITION
In order to obtain the variation law of temperature field of the conical frozen wall reinforcement structure at the end of shield tunnel under the action of seepage, a three-dimensional transient hydrothermal coupling model is established by using COMSOL finite element numerical simulation software. By setting the head difference between the two sides of the boundary of the model and two observation paths, the development of the conical freezing wall, closure and other changes are studied. The results show that the thickness of the freezing wall is small when it is close to the conical cone area. With the increase of the head difference, the freezing wall towards the seepage direc-tion of the degree of offset and the overall thickness of the freezing wall decreases. 5# point in Path 1 freezes in 8d with ice intersection circle, the other points cool faster as when they are closer to the freezing tube. Cooling rate sub-stantially changes near the conical cone part of the 6# point and the bottom of the 10# point in Path 2 at the freezing time of 20d. The results may provide the reference for the design of similar freezing projects.