Abstract：According to conceptual model theory of equivalent material，a large-scale physical model test for excavation of metro station chamber was realized. The excavation process of connection tunnels between metro station chamber and existed double TBM tubes had also been simulated；the ground settlement，soil deformation and displacement of characteristic points around tunnels were also studied. In addition，the influences of the cast-in-place piles to reduce the soil displacement have been simulated. Dynamic mechanical behaviors and deformation laws were obtained. Some conclusions have been obtained. The results may be useful to the construction and expanding excavation of metro station space between existing double TBM tubes.
