Influence of Small Radius Curved Shield Tunneling Excavation on Displacement of Surrounding Soil

In contrast to straight tunnels, the mechanisms of displacement surrounding soil induced by shield excavation small radius curved tunnels are more complex. Based on field monitoring data surface settlement and horizontal a tunnel in section Zhengzhou Metro Line 3, numerical model using three-dimensional finite element method is established evaluate factors soil. The results verify validity simulation comparison with influence unbalanced additional thrust at tail jacks, curvature grouting pressure Maximum outer side inner axes positively related ratio, while negatively pressure. ultimate objective this study ascertain provide theoretical basis technical support for design construction similar tunnel.