为直观了解冻土帷幕在高水压下的力学特性，掌握隧道联接通道开挖过程中渗流与应力耦合作用对冻土帷幕稳定性的影响，保证开挖过程的安全，采用大型有限差分软件FLAC^3D，  对联接通道的开挖过程进行了数值模拟。从渗流应力耦合的数值分析角度，详细研究了冻土帷幕中位移场、应力场、渗流场的分布情况；得出了不同水位对冻土帷幕力学性能的影响；孔隙水压力使冻土帷幕的结构受力更加“均匀”；并指出了容易产生应力集中的位置为冻土帷幕的底部与中部，所以施工中应该值得注意。研究成果可为今后的联接通道数值模拟与人工冻结法施工提供参考。

To ensure the safety of excavating connection aisle in a cross-river-tunnel, the excavation process is numerically simulated by finite difference software FLAC^3D to directly perceive the mechanical features of freezing soil curtain under high water pressure and to investigate the effect of coupled seepage stress on the stability of the curtain. The effect of water level variation on the mechanical features of freezing soil curtain are obtained through numerically analyzing the distribution of displacement field, stress field, and seepage field. It’s found that forces on the curtain are more evenly distributed owing to pore water pressure. The bottom and middle of the curtain, which is more likely subject to stress concentration, should receive more attention. The study provides reference for the simulation of connection aisles and the artificial freezing construction.