Abstract:In order to avoid the dense pile foundations of line-plot tall buildings,parts of metro tunnel need to be constructed by single cavern and double-layer. When the stratum condition is complex,surrounding rock is weak,groundwater level is high and embedded depth of the metro is shallow,and the metro¢s mechanical behavior will be entirely different from that of a single tunnel. The construction process of metro tunnel with single cavern and double-layer with and without temporary cross-link have been simulated numerically by constructing finite element model under weak geological conditions;and the stability and security of support structure in construction process have been studied. The comparison between the calculated displacement of tunnel and the actual measured one has been conducted. The result indicates that it is necessary to increase two-track temporary support in order to assure construction security of the metro tunnel with single cavern and double-layer;and the construction of the below cavern and the removal of temporary cross-link are the key procedures during construction of tunnel.