暗挖出入口隧道与既有建筑相距近，为保证既有结构安全采用隔离桩法施工。文章通过数值模拟分析计算，比较隧道与建筑物之间不设隔离桩和设隔离桩两种工况下施工完成后和各阶段的沉降量，得出设隔离桩是可行的的结论。

Due to the short distance between the mined exit/entrance tunnel and the existing buildings, isolation piles are installed during the tunnel construction so as to ensure the safety of the existing buildings. By means of numerical simulations, analysis and calculations, the article makes a comparison of the settlement value after construction and that during each construction stage under two different working conditions, i.e., condition with isolation piles being installed between the tunnel and the existing buildings and condition with isolation piles being not installed, and draws a conclusion that installing isolation piles is a feasible solution.