Different geometries, lamination schemes, thickness ratios, materials and FGM laws through the thickness have been analyzed in order to have a general overview of the problem. The proposed 3D shell model uses the spherical 3D equilibrium equations developed in general orthogonal curvilinear coordinates....
4.1. Overview Zhengzhou Metro Line 5 is a ring line project of the Zhengzhou Metro. Relying on the bid section, the excavation tunnel and the existing tunnel in the shield construction are selected at a suitable distance, and the engineering test research on the influence of the underground tun...