Abstract: A bottom reinforced concrete frame and masonry mixed structure in Changchun is next to a proposed parallel shielded tunnel excavation. Its deformation characteristics during the tunnel excavation is studied with the combination of construction monitoring and the numerical analyses methods. The stiffness of this mixed reinforced concrete frame and masonry structure has the characteristics of “upper flexible and bottom rigid” and the impact of the total and differential settlement on the performance of this structure are investigated throughout the analysis of these independent footings. In the construction process of the subway section excavation, the settlement of this structure is greatly affected by the construction of the upper portion of the shielded tunnel, but less affected by the construction of lower portion of the shielded tunnel. In the construction process of the parallel shielded tunnel that crossing the mixed structure building, the construction sequence of the first constructing the lower portion of the shielded tunnel and then constructing the upper portion of the shielded tunnel can effectively control the settlement and differential settlement of the above building and reduce the impact on the existing building structure.

Key words: Geotechnical Engineering, Parallel Shielded Tunnels, Bottom Reinforced Concrete Frame Structure, Numerical Simulations, Deformation