Numerical Analysis of DOT Shield 45° crossing the Masonry Structure Buildings

Considering the intersection of building - soil - tunnel, 3D MIDAS / GTS software is used to simulate the conditions of DOT shield tunnel 45 crossing the raft foundation under masonry structure buildings. Additional subsidence and force of the building caused by tunnel construction are studied and the impact of the horizontal position change between tunnels and buildings is considered. The analysis results show that as the DOT shield machine crosses the building, the building would generate uneven horizontal subsidence, it would tilt more in the back-end than the front-end, building subsidence would be stable and slightly rebound after the shield entirely passed through the building; longitudinal differential subsidence would first increase and then decrease, at last the buildings are permanently distorted. With the increase of horizontal distance between the tunnel axis and buildings axis, the building presents a trend dumping to one side of the tunnel, the local inclination of the foundation first increased and then decreased, the maximum shear strain and the first principal stress roughly showed the same changing trend which increased first and then decreased linearly.