Simulation study of deformation of frame structure caused by construction of under-crossing tunnels

Considering the interaction of building-soil-tunnel,the case of frame building with independent foundation undercrossed by double-line parallel shallow embedded tunnel is simulated by FLAC^3D. The results show that the stiffness of frame structure has a remarkable effect on foundation settling tank of the upper building. In the direction of perpendicular to the tunnel axis, the largest differential settlement between two frame columns usually happens around the inflection point of settlement curve, and the existence of the upper structure reduces the differential settlement between columns. The differential settlement relates to the relative position of tunnel face in the direction of parallel to tunnel axis, while it will be a very small value when the tunnel face is far away enough.