Study on Displacement Development of Deep Alluvial Frozen Well Wall

The frozen well wall displacement is an important problem in the construction process of the wellbore freezing method. The size of the well wall displacement directly affects the stability of the frozen wall. Excessive well wall displacement can even cause the freezing tube to break, thus affecting the overall construction safety. To further study the displacement of the well wall, the parameters of formation pressure, frozen wall temperature, physical parameters of frozen soil, mechanical parameters and other factors were used to simulate the well wall displacement during the excavation process with COMSOL Multiphysics numerical simulation software, and compare with the field measured data. The results show that in the high section of one excavation, the development of well wall displacement is relatively large in the early stage, stable in the medium term, and there is basically no change in the later stage. The optimum excavation height is 4 m, and the displacement of the well displacement of 6 h simulated displacement is 32.94 mm, more than the measured 27 mm; the simulation results are in good agreement with the actual situation.