SPH simulation of forming process of frozen wall of shaft

The freezing process of soil under the action of freezing pipe is related to the release of latent heat of phase change. An accurate description of temperature distribution characteristics near the freezing pipe and the freezing front movement rules is very important to determine the frozen wall thickness and safety design reasonably. The smoothed particle method, as a Lagrange meshless particle method, has been successfully used in solving many kinds of engineering problems with its unique advantages. The problem of heat conduction involving phase change is solved by the corresponding calculation program based on the smoothed particle method, and the practability and reliability of this method is verified through numerical examples with analytical solution, so a new solution for solving this kind of problem is given and the application range of the smooth particle method is extended. In the end, numerical analysis of forming process of frozen wall in construction of a coal mine shaft is carried out. The distribution and evolution characteristics of the temperature field are calculated under the condition of freezing pipe with single-ring and uniformly-spaced arrangement. The freezing effects of two kinds of soil media with different thermal physical properties are compared under the same freezing condition, and the influences of schemes with different staggered distribution holes on the forming process of frozen wall are emphatically analyzed so as to provide a basis for engineering design.