Abstract
Shield tail wire brushes (hereinafter referred to as ‘tail brush’) may need to be replaced because of excessive wear, which reduces the sealing function in long-distance tunnel projects. Surrounding soil should be strengthened to ensure construction safety when replacing the tail brush. In recent years, liquid nitrogen freezing technology has become popular due to its high efficiency. However, various schemes and different installation forms of freezing pipes have been developed, and studying them is imperative. With the tunnel project for Nanjing Metro Line 10 used as an example, three freezing schemes are numerically simulated using ADINA finite element software to establish 3D numerical models. The variation of the temperature field and the adaptability of the schemes are studied through an analysis of the calculated results in many aspects.
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