Elastic Analytical Solution of Deep-Buried and Linered Circle Tunnel Considering Stress Release

Three-dimensional effect of tunnel excavation and lining facilities do not timely made will be applied before the lining caused by the cutting face rock stress release, accompanied by displacement of the release, and displacement of surrounding rock stress release and the release of the lining, stress and deformation of rock characteristics have a greater impact. Thick cylinder based on the Ram elasticity solution is derived considering the excavation surface rock stress release with a deep circular tunnel lining plane strain elastic solution, and using MIDAS-GTS finite element program analysis were confirmed. Study found that stress release by the tunnel excavation and displacement of the impact of the release, the lining surrounding the deformation of the contact interface is not continuous, deformation of support structure can not be equivalent to rock deformation, especially for soft rock tunnel, a smaller stress release will cause a larger displacement of release; lining applied to do the more timely, the smaller the stress release, lining the role of rock deformation of the more obvious constraints, so that in a good three-rock stress state, rock the biggest minimum principal stress difference between the lower plastic deformation of surrounding rock as well as reduce risk of damage, but the older facilities is bound to make lining a large rock under pressure, resulting in a larger internal force, engineering practice should be determined depending on the circumstances supporting a reasonable time.