Additional Stress of Soil and Surface Settlement during Tunnel Shield Construction

To study the influence of shield excavation on surrounding soil, and to control subway tunnel surface settlement deformation buildings, it is necessary additional stress soil caused by law settlement. Combined with a construction project tunnel, this article uses Mindlin solution in elastic mechanics obtain three-dimensional calculation formulas for thrust cutter head displacement field friction force between shell contact interface soil. The Loganathan ground movement pattern used determine mode. source–sink method formula calculating around loss. results show that when digging, goes through five stages, namely uplift before arrival head, reaches subsides tail passes through, passage shield, lining separated from consolidation after through.